Some standard content:
ICS77.140.75
National Standard of the People's Republic of China
GB/T 8163-1999
neq IS0 559: 1991
Seamless steel tubes for liquid service
Seamless steel tubes for liquid service1999-11-01Published
2000-08-01Implementation
Published by the State Administration of Quality and Technical Supervision
GB/T8163--1999
This standard adopts ISO559:1991 "Pipes for clean water and sewage", and revise GB/T8163-1987 "Seamless steel tubes for conveying fluids" in combination with my country's situation.
The dimensional tolerance of this standard is stricter than that of ISO559, and other indicators are equivalent to that standard. This standard has been revised and the following clauses have been modified: 1 The size tolerance deviation index has been modified. The original table 1 and table 2 size specifications are cancelled and replaced with the table 1 specifications in GB/T17395-1998; the brand and mechanical performance indicators are modified; the hydraulic test and flattening test contents are modified; the original Appendix A is cancelled and incorporated into the main text of the standard. From the date of implementation of this standard, it replaces GB/T8163-1987 "Seamless Steel Tubes for Liquid Service". This standard was proposed by the State Metallurgical Industry Bureau. This standard is under the jurisdiction of the National Steel Standardization Technical Committee. The drafting units of this standard are: Anshan Iron and Steel Company, Chengdu Seamless Steel Tube Co., Ltd. The main drafters of this standard are: Chen Yong, Pu Zhimin, You Kemin, Feng Wenhua. This standard was first issued in July 1987. 1 Scope National Standard of the People's Republic of China Seamless Steel Tubes for Liquid Service Seamless Steel Tubes for Liquid Service GB/T_ 8163. -1999 IsO 559:1991
Replaces GB/T8163-1987
This standard specifies the dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of seamless steel pipes for conveying fluids.
This standard applies to general seamless steel pipes for conveying fluids. 2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T222-1984 Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products GB/T 223. 5-1997
Chemical analysis methods for steel and alloys-Determination of acid-soluble silicon content by reduced potassium silicate photometric method GB/T 223.12- 1991
Methods for chemical analysis of steel and alloy-Sodium carbonate separation-diphenylcarbonyl-carbonate spectrophotometric determination of chromium content GB/T.223.14—1989 Methods for chemical analysis of steel and alloy-Reagent extraction spectrophotometric determination of vanadium content GB/T 223.53—1987
Methods for chemical analysis of steel and alloy-Flame atomic absorption spectrophotometric determination of copper content GB/T223.54—1987
Methods for chemical analysis of steel and alloy-Flame atomic absorption spectrophotometric determination of nickel content GB/T 223.62—1988
GB/T 223.64—1988
GB/T223.69-1997
GB/T 223.72—1991
GB/T 228-1987
GB3/T 2411990
GB/T 242-1997
GB/T 244 -1997
GB/T246—1997
G3/T699—1999
Methods for chemical analysis of iron, steel and alloys: determination of phosphorus content by acetic acid benzene photometric methodMethods for chemical analysis of iron, steel and alloys
Chemical analysis of iron, steel and alloys by film method
Methods for chemical analysis of iron, steel and alloys
Metal tension test method
Metal pipe hydraulic test method
Metal pipe expansion test method
Metal pipe bending test method
Metal pipe flattening test method
High-quality carbon structural steel
GB/T1591-1994
Low alloy high strength structural steel
GB/T 2102—1988
Determination of manganese content by flame atomic absorption spectrometry
Determination of carbon content by gas volumetric method after combustion in a tubular furnace Determination of sulfur content by alumina chromatography-sulfuric acid lock gravimetric method Acceptance, packaging, marking and quality certificate of steel pipes GB/5777—1996 Ultrasonic flaw detection method for seamless steel pipes GB/T 7735—1995
GB/T 12606- 1999
Steel tube eddy current flaw detection method
Steel magnetic leakage flaw detection method
GB/T17395-1998 Seamless steel tube size, weight and allowable deviation YB/T5222-1993
High-quality carbon steel round tube
State Quality and Technical Supervision Bureau 199911-01 approved 2000-08-01 implementation
3 size, shape, weight
3.1 outer diameter and wall thickness
GB/T 8163-1999
Steel tubes are divided into hot rolling (extrusion, expansion) and cold drawing (rolling). Its outer diameter and wall thickness should meet the requirements of GB/T17395. 3.2 Permissible deviation of outer diameter and wall thickness
3.2.1 The permissible deviation of outer diameter and wall thickness of steel pipe shall comply with the provisions of Table 1. When the purchaser does not specify the permissible deviation of steel pipe size in the contract in advance, the permissible deviation of outer diameter and wall thickness of steel pipe shall be supplied as ordinary grade. According to the purchaser's requirements, after negotiation between the supply and demand parties and indicated in the contract, steel pipes with permissible deviation of dimensions other than those specified in Table 1 may be produced. Table 1 Permissible deviation of outer diameter and wall thickness
Types of steel pipes
Hot-rolled (extruded, expanded) pipes
Cold-drawn (rolled) pipes
Outer diameter D
Wall thickness
Outer diameter D
Wall thickness:
Steel pipe size
Ordinary grade
>10-30
>30~50
1%(minimum ±0.50)
Allowable deviation
(minimum ±0.4)
Note: For heat-expanded pipes with an outer diameter not less than 351mm, the allowable deviation of wall thickness is ±18%3.3 Length
3.3.1 Normal length
The normal length of steel pipes is specified as follows:
Hot-rolled (extruded, expanded) steel pipes
Cold-drawn (rolled) steel pipes
3.3.2 Fixed length and multiple lengths
The fixed length of steel pipes should be within the normal length range, and the allowable deviation of length is specified as follows: Length ≤6 000 mm
Length>6000mm
The total length of the steel pipe should be within the normal length range, and the allowable deviation of the total length is +20. The cutting allowance should be left for each multiple length according to the following provisions: Outside diameter ≤159 mm
Outer diameter ≥159 mm
3000-~12000mm
3000~10500mm
5~10 mm
10--15mm
3.3.3 Range length
GB/T8163—1999
The range length of the pipe should be within the normal length range. 3.4 Curvature
The curvature of the steel pipe shall not be greater than the following provisions: Wall thickness ≤ 15 mm
Wall thickness = 15 mm
Outer diameter ≥ 351 mm
3.5 End shape
The end faces of the steel pipe at both ends shall be perpendicular to the axis of the steel pipe, and the burrs on the cut shall be removed. 3.6 Delivery weight
3.6.1 The delivery weight of the steel pipe shall be in accordance with the provisions of GB/T17395 (the density of steel is calculated as 7.85 kg/dm2). 3.6.2 Weight tolerance
2. 0 mm/m
3. 0 mm/m
According to the requirements of the purchaser, after negotiation between the supply and demand parties and indicated in the contract, the tolerance between the actual weight of the delivered steel pipe and the theoretical weight is: single steel pipe: ±10%;
each batch of at least 101 steel pipes: ±7.5%. 3.7 Marking example
Steel pipe with an outer diameter of 73 mm and a wall thickness of 3.5 mm made of No. 10 steel: a) Hot-rolled steel pipe, length 3000 mm multiples of 10-73X3.5×3 000 times—GB/T 8163—1999b) Cold drawn (rolled) steel pipe, diameter is high-grade precision, wall thickness is ordinary-grade precision, length is 5000mm cold 10—73 high × 3. 5X5 000—GB/T 8163—1999: 4 Technical requirements
4.1 Steel grade and chemical composition
4.1.1 The steel pipe is made of 10, 20, Q295.Q345 steel. According to the requirements of the buyer, other grades of steel pipes can be produced after negotiation between the supply and demand parties. 4.1.2 The steel grade and chemical composition (melting analysis) shall comply with the provisions of GB/T699 or GB/T1591. The steel pipe shall be accepted according to the melting composition.
When the purchaser proposes to make a finished product analysis, the allowable deviation of the chemical composition of the steel pipe shall comply with the provisions of Table 1 and Table 2 in GB/T 222-1984.
4.2 Manufacturing method
4.2.1 Manufacturing method of steel
Steel shall be smelted by electric furnace, open hearth furnace or oxygen converter. When the purchaser specifies a certain manufacturing method, it shall be indicated in the contract. 4.2.2 Manufacturing method of pipe rod
Pipe rod can be manufactured by hot rolling (forging). Hot rolled (forged) pipe rod shall comply with the provisions of YB/T5222. Continuous casting rod or steel ingot can also be used. 4.2.3 Manufacturing method of steel pipe
Steel pipe shall be manufactured by hot rolling (extrusion, expansion) and cold drawing (rolling) seamless method. When the purchaser specifies a certain manufacturing method, it shall be indicated in the contract. 4.3 Delivery status
Hot-rolled (extruded, expanded) steel pipes are delivered in hot-rolled or heat-treated status; cold-drawn (rolled) steel pipes are delivered in heat-treated status. 4.4 Mechanical properties
The longitudinal mechanical properties of steel pipes in delivery status shall comply with the provisions of Table 2. 3
4.5 Process tests
4.5.1 Flattening test
GB/T 81631999
Table 2 Longitudinal mechanical properties of steel pipes
Service point.
Tensile strength
335475
410~550
430~610
190-665
Not less than
Elongation after fracture
For steel pipes with an outer diameter of >22~~400mm and a wall thickness to outer diameter ratio of no more than 10%, a flattening test shall be carried out, and the plate spacing H value shall be calculated as follows:
Nominal wall thickness of steel pipe, mm;
-Nominal outer diameter of steel pipe, mm;
(l+α)s
α+s/D
-Deformation coefficient per unit length, 0.09 for 10 steel, 0.07 for 20 steel, and 0.06 for Q295 and Q345 steel. After the flattening test, the specimen shall be free of cracks or splits. 4.5.2 Expansion test
According to the requirements of the purchaser, after negotiation between the supply and demand parties, and indicated in the contract, the steel pipe with a wall thickness not exceeding 8mm can be subjected to the expansion test, and the neck taper is one of 30°, 45°, and 60°. After expansion, the specimen shall not have cracks or splits. The expansion rate of the outer diameter of the expansion specimen shall comply with the provisions of Table 3. Table 3 Expansion rate of outer diameter of steel pipe
Expansion rate of outer diameter of steel pipe, %
Superior carbon steel
Low alloy steel
4.5.3 Bending test
Inner diameter/outer diameter
>0. 6~0. 8
According to the requirements of the purchaser, after negotiation between the supply and demand parties, and indicated in the contract, the steel pipe with an outer diameter not exceeding 22mm can be subjected to the bending test, the bending angle is 90°, the bending radius is 6 times the outer diameter of the steel pipe, and no cracks or splits shall appear at the bending. 4.5.4 Hydraulic test
Steel pipes shall be subjected to hydraulic test one by one. The test pressure shall be calculated as follows. The maximum pressure shall not exceed 19MPa. P
-test pressure, MPa!
\-nominal thickness of steel pipe, mm;
D-nominal outer diameter of steel pipe. mm
R-allowable stress, 60% of the specified service point, MPa. 2sR
Under the test pressure, the endurance time shall be not less than 5s, and the steel pipe shall not leak. 4
GB/T8163--1999
The supplier may use ultrasonic flaw detection, eddy current flaw detection or magnetic flux leakage flaw detection instead of hydraulic test. When ultrasonic testing is used, the depth of the longitudinal notch on the outer surface of the comparison sample tube is 12.5% of the nominal wall thickness of the steel pipe. When eddy current testing is used, the acceptance level A in GB/T7735-1995 should be adopted; when magnetic leakage testing is used, the longitudinal notch on the outer surface of the comparison sample tube should comply with the provisions of N12.5 in GB/T12606--1990, with a minimum depth of 0.5mm and a maximum depth of 1.5mm
4.6 Surface quality
There shall be no cracks, folds, rolls, delamination and scarring on the inner and outer surfaces of the steel pipe. These defects must be completely removed, and the actual wall thickness at the removal point shall not be less than the minimum value allowed by the wall thickness. Other defects whose depth does not exceed the negative deviation of the wall sequence are allowed to exist. 5 Test method
5.1 The size and shape of the steel pipe shall be measured one by one using a measuring machine that meets the accuracy requirements. 5.2 The inner and outer surfaces of the steel pipe shall be visually inspected one by one under sufficient lighting conditions. 5.3 Other inspection items of steel pipes shall comply with the requirements of Table 4. Table 4 Inspection items for steel pipes
6 Inspection rules
Inspection item H
Chemical composition
Tensile test
Flattening test
Expansion test
Bending test
Hydraulic test
Eddy current flaw detection
Ultrasonic flaw detection
Magnetic leakage flaw detection
6.1 Inspection and acceptance
Test method
GR/T222
GB/T223
GB/T 228
GB/T 246
GB/T 242
GB/T 244
GB/T 241
GB/T 7735
GB/T 5777
GB/T 12606
The inspection and acceptance of steel pipes shall be carried out by the technical supervision department of the supplier. 6.2 Batch rules
Take 1 sample from each furnace
Quantity of sampling
Take 1 sample from each steel pipe for each batch ...
The number of steel pipes in each batch shall not exceed the following provisions: Outer diameter not more than 76mm, and wall thickness not more than 3mm Outer diameter greater than 351mm
Other size steel pipes
400 pieces
200 pieces
The remaining steel pipes, if not less than 50% of the above provisions, shall be listed as a separate batch; if less than 50% of the above provisions, they may be combined into adjacent batches of the same brand, the same furnace (tank) number and the same specification. When the purchaser does not make special requirements in advance, high-quality carbon steel can be grouped into a batch of steel pipes of the same specification and brand with different furnace () numbers. 6.3 Sampling quantity
The sampling quantity for various performance tests of each batch of steel pipes shall comply with the provisions of Table 4. 6.4 Re-inspection and judgment rules
GB/T 8163-1999
The re-inspection and judgment rules of steel pipes shall comply with the provisions of GB/T2102. Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the provisions of GB/T 2102. According to the requirements of the purchaser and indicated in the contract, the inner and outer surfaces of the steel pipes may be coated with a protective layer. The material of the protective layer shall be determined by the supplier if the purchaser does not make special requirements.2 Manufacturing method of steel pipe
Steel pipe can be manufactured by hot rolling (forging). Hot rolled (forged) steel pipe shall comply with the provisions of YB/T5222. Continuous casting or steel ingot can also be used. 4.2.3 Manufacturing method of steel pipe
Steel pipe shall be manufactured by hot rolling (extrusion, expansion) and cold drawing (rolling) seamless method. When the purchaser specifies a certain manufacturing method, it shall be indicated in the contract. 4.3 Delivery status
Hot rolled (extrusion, expansion) steel pipe is delivered in hot rolled state or heat treated state; cold drawn (rolled) steel pipe is delivered in heat treated state. 4.4 Mechanical properties
The longitudinal mechanical properties of steel pipe in delivery state shall comply with the provisions of Table 2. 3
4.5 Process test
4.5.1 Flattening test
GB/T 81631999
Table 2 Longitudinal mechanical properties of steel pipe
Service point.
Tensile strength
335475
410~550
430~610
190-665
Not less than
Elongation after fracture
For steel pipes with an outer diameter of >22~~400mm and a wall thickness to outer diameter ratio of no more than 10%, a flattening test shall be carried out, and the plate spacing H value shall be calculated as follows:
Nominal wall thickness of steel pipe, mm;
-Nominal outer diameter of steel pipe, mm;
(l+α)s
α+s/D
-Deformation coefficient per unit length, 0.09 for 10 steel, 0.07 for 20 steel, and 0.06 for Q295 and Q345 steel. After the flattening test, the specimen shall be free of cracks or splits. 4.5.2 Expansion test
According to the requirements of the purchaser, after negotiation between the supply and demand parties, and indicated in the contract, the steel pipe with a wall thickness not exceeding 8mm can be subjected to the expansion test, and the neck taper is one of 30°, 45°, and 60°. After expansion, the specimen shall not have cracks or splits. The expansion rate of the outer diameter of the expansion specimen shall comply with the provisions of Table 3. Table 3 Expansion rate of outer diameter of steel pipe
Expansion rate of outer diameter of steel pipe, %
Superior carbon steel
Low alloy steel
4.5.3 Bending test
Inner diameter/outer diameter
>0. 6~0. 8
According to the requirements of the purchaser, after negotiation between the supply and demand parties, and indicated in the contract, the steel pipe with an outer diameter not exceeding 22mm can be subjected to the bending test, the bending angle is 90°, the bending radius is 6 times the outer diameter of the steel pipe, and no cracks or splits shall appear at the bending. 4.5.4 Hydraulic test
Steel pipes shall be subjected to hydraulic test one by one. The test pressure shall be calculated as follows. The maximum pressure shall not exceed 19MPa. P
-test pressure, MPa!
\-nominal thickness of steel pipe, mm;
D-nominal outer diameter of steel pipe. mm
R-allowable stress, 60% of the specified service point, MPa. 2sR
Under the test pressure, the endurance time shall be not less than 5s, and the steel pipe shall not leak. 4
GB/T8163--1999
The supplier may use ultrasonic flaw detection, eddy current flaw detection or magnetic flux leakage flaw detection instead of hydraulic test. When ultrasonic testing is used, the depth of the longitudinal notch on the outer surface of the comparison sample tube is 12.5% of the nominal wall thickness of the steel pipe. When eddy current testing is used, the acceptance level A in GB/T7735-1995 should be adopted; when magnetic leakage testing is used, the longitudinal notch on the outer surface of the comparison sample tube should comply with the provisions of N12.5 in GB/T12606--1990, with a minimum depth of 0.5mm and a maximum depth of 1.5mm
4.6 Surface quality
There shall be no cracks, folds, rolls, delamination and scarring on the inner and outer surfaces of the steel pipe. These defects must be completely removed, and the actual wall thickness at the removal point shall not be less than the minimum value allowed by the wall thickness. Other defects whose depth does not exceed the negative deviation of the wall sequence are allowed to exist. 5 Test method
5.1 The size and shape of the steel pipe shall be measured one by one using a measuring machine that meets the accuracy requirements. 5.2 The inner and outer surfaces of the steel pipe shall be visually inspected one by one under sufficient lighting conditions. 5.3 Other inspection items of steel pipes shall comply with the requirements of Table 4. Table 4 Inspection items for steel pipes
6 Inspection rules
Inspection item H
Chemical composition
Tensile test
Flattening test
Expansion test
Bending test
Hydraulic test
Eddy current flaw detection
Ultrasonic flaw detection
Magnetic leakage flaw detection
6.1 Inspection and acceptance
Test method
GR/T222
GB/T223
GB/T 228
GB/T 246
GB/T 242
GB/T 244
GB/T 241
GB/T 7735
GB/T 5777
GB/T 12606
The inspection and acceptance of steel pipes shall be carried out by the technical supervision department of the supplier. 6.2 Batch rules
Take 1 sample from each furnace
Quantity of sampling
Take 1 sample from each steel pipe for each batch ...
The number of steel pipes in each batch shall not exceed the following provisions: Outer diameter not more than 76mm, and wall thickness not more than 3mm Outer diameter greater than 351mm
Other size steel pipes
400 pieces
200 pieces
The remaining steel pipes, if not less than 50% of the above provisions, shall be listed as a separate batch; if less than 50% of the above provisions, they may be combined into adjacent batches of the same brand, the same furnace (tank) number and the same specification. When the purchaser does not make special requirements in advance, high-quality carbon steel can be grouped into a batch of steel pipes of the same specification and brand with different furnace () numbers. 6.3 Sampling quantity
The sampling quantity for various performance tests of each batch of steel pipes shall comply with the provisions of Table 4. 6.4 Re-inspection and judgment rules
GB/T 8163-1999
The re-inspection and judgment rules of steel pipes shall comply with the provisions of GB/T2102. Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the provisions of GB/T 2102. According to the requirements of the purchaser and indicated in the contract, the inner and outer surfaces of the steel pipes may be coated with a protective layer. The material of the protective layer shall be determined by the supplier if the purchaser does not make special requirements.2 Manufacturing method of steel pipe
Steel pipe can be manufactured by hot rolling (forging). Hot rolled (forged) steel pipe shall comply with the provisions of YB/T5222. Continuous casting or steel ingot can also be used. 4.2.3 Manufacturing method of steel pipe
Steel pipe shall be manufactured by hot rolling (extrusion, expansion) and cold drawing (rolling) seamless method. When the purchaser specifies a certain manufacturing method, it shall be indicated in the contract. 4.3 Delivery status
Hot rolled (extrusion, expansion) steel pipe is delivered in hot rolled state or heat treated state; cold drawn (rolled) steel pipe is delivered in heat treated state. 4.4 Mechanical properties
The longitudinal mechanical properties of steel pipe in delivery state shall comply with the provisions of Table 2. 3
4.5 Process test
4.5.1 Flattening test
GB/T 81631999
Table 2 Longitudinal mechanical properties of steel pipe
Service point.
Tensile strength
335475
410~550
430~610
190-665
Not less than
Elongation after fracture
For steel pipes with an outer diameter of >22~~400mm and a wall thickness to outer diameter ratio of no more than 10%, a flattening test shall be carried out, and the plate spacing H value shall be calculated as follows:
Nominal wall thickness of steel pipe, mm;
-Nominal outer diameter of steel pipe, mm;
(l+α)s
α+s/D
-Deformation coefficient per unit length, 0.09 for 10 steel, 0.07 for 20 steel, and 0.06 for Q295 and Q345 steel. After the flattening test, the specimen shall be free of cracks or splits. 4.5.2 Expansion test
According to the requirements of the purchaser, after negotiation between the supply and demand parties, and indicated in the contract, the steel pipe with a wall thickness not exceeding 8mm can be subjected to the expansion test, and the neck taper is one of 30°, 45°, and 60°. After expansion, the specimen shall not have cracks or splits. The expansion rate of the outer diameter of the expansion specimen shall comply with the provisions of Table 3. Table 3 Expansion rate of outer diameter of steel pipe
Expansion rate of outer diameter of steel pipe, %
Superior carbon steel
Low alloy steel
4.5.3 Bending test
Inner diameter/outer diameter
>0. 6~0. 8
According to the requirements of the purchaser, after negotiation between the supply and demand parties, and indicated in the contract, the steel pipe with an outer diameter not exceeding 22mm can be subjected to the bending test, the bending angle is 90°, the bending radius is 6 times the outer diameter of the steel pipe, and no cracks or splits shall appear at the bending. 4.5.4 Hydraulic test
Steel pipes shall be subjected to hydraulic test one by one. The test pressure shall be calculated as follows. The maximum pressure shall not exceed 19MPa. P
-test pressure, MPa! www.bzxz.net
\-nominal thickness of steel pipe, mm;
D-nominal outer diameter of steel pipe. mm
R-allowable stress, 60% of the specified service point, MPa. 2sR
Under the test pressure, the endurance time shall be not less than 5s, and the steel pipe shall not leak. 4
GB/T8163--1999
The supplier may use ultrasonic flaw detection, eddy current flaw detection or magnetic flux leakage flaw detection instead of hydraulic test. When ultrasonic testing is used, the depth of the longitudinal notch on the outer surface of the comparison sample tube is 12.5% of the nominal wall thickness of the steel pipe. When eddy current testing is used, the acceptance level A in GB/T7735-1995 should be adopted; when magnetic leakage testing is used, the longitudinal notch on the outer surface of the comparison sample tube should comply with the provisions of N12.5 in GB/T12606--1990, with a minimum depth of 0.5mm and a maximum depth of 1.5mm
4.6 Surface quality
There shall be no cracks, folds, rolls, delamination and scarring on the inner and outer surfaces of the steel pipe. These defects must be completely removed, and the actual wall thickness at the removal point shall not be less than the minimum value allowed by the wall thickness. Other defects whose depth does not exceed the negative deviation of the wall sequence are allowed to exist. 5 Test method
5.1 The size and shape of the steel pipe shall be measured one by one using a measuring machine that meets the accuracy requirements. 5.2 The inner and outer surfaces of the steel pipe shall be visually inspected one by one under sufficient lighting conditions. 5.3 Other inspection items of steel pipes shall comply with the requirements of Table 4. Table 4 Inspection items for steel pipes
6 Inspection rules
Inspection item H
Chemical composition
Tensile test
Flattening test
Expansion test
Bending test
Hydraulic test
Eddy current flaw detection
Ultrasonic flaw detection
Magnetic leakage flaw detection
6.1 Inspection and acceptance
Test method
GR/T222
GB/T223
GB/T 228
GB/T 246
GB/T 242
GB/T 244
GB/T 241
GB/T 7735
GB/T 5777
GB/T 12606
The inspection and acceptance of steel pipes shall be carried out by the technical supervision department of the supplier. 6.2 Batch rules
Take 1 sample from each furnace
Quantity of sampling
Take 1 sample from each steel pipe for each batch ...
The number of steel pipes in each batch shall not exceed the following provisions: Outer diameter not more than 76mm, and wall thickness not more than 3mm Outer diameter greater than 351mm
Other size steel pipes
400 pieces
200 pieces
The remaining steel pipes, if not less than 50% of the above provisions, shall be listed as a separate batch; if less than 50% of the above provisions, they may be combined into adjacent batches of the same brand, the same furnace (tank) number and the same specification. When the purchaser does not make special requirements in advance, high-quality carbon steel can be grouped into a batch of steel pipes of the same specification and brand with different furnace () numbers. 6.3 Sampling quantity
The sampling quantity for various performance tests of each batch of steel pipes shall comply with the provisions of Table 4. 6.4 Re-inspection and judgment rules
GB/T 8163-1999
The re-inspection and judgment rules of steel pipes shall comply with the provisions of GB/T2102. Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the provisions of GB/T 2102. According to the requirements of the purchaser and indicated in the contract, the inner and outer surfaces of the steel pipes may be coated with a protective layer. The material of the protective layer shall be determined by the supplier if the purchaser does not make special requirements.8
According to the requirements of the purchaser, after negotiation between the supply and demand parties and indicated in the contract, steel pipes with an outer diameter not exceeding 22mm can be subjected to bending tests, with a bending angle of 90° and a bending radius of 6 times the outer diameter of the steel pipe. No cracks or splits shall appear at the bends. 4.5.4 Hydraulic test
Steel pipes shall be subjected to hydraulic tests one by one, and the test pressure shall be calculated according to the following formula, with the maximum pressure not exceeding 19MPa. P
-Test pressure, MPa!
\-Nominal thickness of steel pipe, mm;
D-Nominal outer diameter of steel pipe. mm
R-Allowable stress, 60% of the specified service point, MPa. 2sR
Under the test pressure, the endurance time shall be guaranteed to be no less than 5s, and no leakage shall occur in the steel pipe. 4
GB/T8163--1999
The supplier may use ultrasonic testing, eddy current testing or magnetic flux leakage testing instead of hydraulic testing. When ultrasonic testing is used, the depth of the longitudinal notch on the outer surface of the comparison sample tube is 12.5% of the nominal wall thickness of the steel pipe. When eddy current testing is used, the acceptance level A in GB/T7735-1995 shall be adopted; when magnetic flux leakage testing is used, the longitudinal notch on the outer surface of the comparison sample tube shall comply with the provisions of N12.5 in GB/T12606--1990, with a minimum depth of 0.5mm and a maximum depth of 1.5mm
4.6 Surface quality
There shall be no cracks, folds, rolls, delamination and scarring on the inner and outer surfaces of the steel pipe. These defects must be completely removed, and the actual wall thickness at the removed location shall not be less than the minimum value allowed by the wall thickness. Other defects whose depth does not exceed the negative deviation of the wall sequence are allowed to exist. 5 Test methods
5.1 The size and shape of the steel pipe shall be measured one by one using a measuring machine that meets the accuracy requirements. 5.2 The inner and outer surfaces of the steel pipe shall be visually inspected one by one under sufficient lighting conditions. 5.3 Other inspection items of the steel pipe shall comply with the provisions of Table 4. Table 4 Inspection items for steel pipes
6 Inspection rules
Inspection item H
Chemical composition
Tensile test
Flattening test
Expansion test
Bending test
Hydraulic test
Eddy current flaw detection
Ultrasonic flaw detection
Magnetic leakage flaw detection
6.1 Inspection and acceptance
Test method
GR/T222
GB/T223
GB/T 228
GB/T 246
GB/T 242
GB/T 244
GB/T 241
GB/T 7735
GB/T 5777
GB/T 12606
The inspection and acceptance of steel pipes shall be carried out by the technical supervision department of the supplier. 6.2 Batch rules
Take 1 sample from each furnace
Quantity of sampling
Take 1 sample from each steel pipe for each batch ...
The number of steel pipes in each batch shall not exceed the following provisions: Outer diameter not more than 76mm, and wall thickness not more than 3mm Outer diameter greater than 351mm
Other size steel pipes
400 pieces
200 pieces
The remaining steel pipes, if not less than 50% of the above provisions, shall be listed as a separate batch; if less than 50% of the above provisions, they may be combined into adjacent batches of the same brand, the same furnace (tank) number and the same specification. When the purchaser does not make special requirements in advance, high-quality carbon steel can be grouped into a batch of steel pipes of the same specification and brand with different furnace () numbers. 6.3 Sampling quantity
The sampling quantity for various performance tests of each batch of steel pipes shall comply with the provisions of Table 4. 6.4 Re-inspection and judgment rules
GB/T 8163-1999
The re-inspection and judgment rules of steel pipes shall comply with the provisions of GB/T2102. Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the provisions of GB/T 2102. According to the requirements of the purchaser and indicated in the contract, the inner and outer surfaces of the steel pipes may be coated with a protective layer. The material of the protective layer shall be determined by the supplier if the purchaser does not make special requirements.8
According to the requirements of the purchaser, after negotiation between the supply and demand parties and indicated in the contract, steel pipes with an outer diameter not exceeding 22mm can be subjected to bending tests, with a bending angle of 90° and a bending radius of 6 times the outer diameter of the steel pipe. No cracks or splits shall appear at the bends. 4.5.4 Hydraulic test
Steel pipes shall be subjected to hydraulic tests one by one, and the test pressure shall be calculated according to the following formula, with the maximum pressure not exceeding 19MPa. P
-Test pressure, MPa!
\-Nominal thickness of steel pipe, mm;
D-Nominal outer diameter of steel pipe. mm
R-Allowable stress, 60% of the specified service point, MPa. 2sR
Under the test pressure, the endurance time shall be guaranteed to be no less than 5s, and no leakage shall occur in the steel pipe. 4
GB/T8163--1999
The supplier may use ultrasonic testing, eddy current testing or magnetic flux leakage testing instead of hydraulic testing. When ultrasonic testing is used, the depth of the longitudinal notch on the outer surface of the comparison sample tube is 12.5% of the nominal wall thickness of the steel pipe. When eddy current testing is used, the acceptance level A in GB/T7735-1995 shall be adopted; when magnetic flux leakage testing is used, the longitudinal notch on the outer surface of the comparison sample tube shall comply with the provisions of N12.5 in GB/T12606--1990, with a minimum depth of 0.5mm and a maximum depth of 1.5mm
4.6 Surface quality
There shall be no cracks, folds, rolls, delamination and scarring on the inner and outer surfaces of the steel pipe. These defects must be completely removed, and the actual wall thickness at the removed location shall not be less than the minimum value allowed by the wall thickness. Other defects whose depth does not exceed the negative deviation of the wall sequence are allowed to exist. 5 Test methods
5.1 The size and shape of the steel pipe shall be measured one by one using a measuring machine that meets the accuracy requirements. 5.2 The inner and outer surfaces of the steel pipe shall be visually inspected one by one under sufficient lighting conditions. 5.3 Other inspection items of the steel pipe shall comply with the provisions of Table 4. Table 4 Inspection items for steel pipes
6 Inspection rules
Inspection item H
Chemical composition
Tensile test
Flattening test
Expansion test
Bending test
Hydraulic test
Eddy current flaw detection
Ultrasonic flaw detection
Magnetic leakage flaw detection
6.1 Inspection and acceptance
Test method
GR/T222
GB/T223
GB/T 228
GB/T 246
GB/T 242
GB/T 244
GB/T 241
GB/T 7735
GB/T 5777
GB/T 12606
The inspection and acceptance of steel pipes shall be carried out by the technical supervision department of the supplier. 6.2 Batch rules
Take 1 sample from each furnace
Quantity of sampling
Take 1 sample from each steel pipe for each batch ...
The number of steel pipes in each batch shall not exceed the following provisions: Outer diameter not more than 76mm, and wall thickness not more than 3mm Outer diameter greater than 351mm
Other size steel pipes
400 pieces
200 pieces
The remaining steel pipes, if not less than 50% of the above provisions, shall be listed as a separate batch; if less than 50% of the above provisions, they may be combined into adjacent batches of the same brand, the same furnace (tank) number and the same specification. When the purchaser does not make special requirements in advance, high-quality carbon steel can be grouped into a batch of steel pipes of the same specification and brand with different furnace () numbers. 6.3 Sampling quantity
The sampling quantity for various performance tests of each batch of steel pipes shall comply with the provisions of Table 4. 6.4 Re-inspection and judgment rules
GB/T 8163-1999
The re-inspection and judgment rules of steel pipes shall comply with the provisions of GB/T2102. Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the provisions of GB/T 2102. According to the requirements of the purchaser and indicated in the contract, the inner and outer surfaces of the steel pipes may be coated with a protective layer. The material of the protective layer shall be determined by the supplier if the purchaser does not make special requirements.
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