Some standard content:
1CS 77. 140. 75
National Standard of the People's Republic of China
GB/T 8162—1999
Seamless steel tubes for structural purposes1999-11-01Promulgated
Implemented on 2000-08-01
Promulgated by the State Administration of Quality and Technical Supervision
GB/T 8162-1999
This standard adopts the Japanese standard JIS G3444--1994 Carbon Steel Tubes for Ordinary Structural Purposes, and revise G/T8162—1987 Seamless Steel Tubes for Structural Purposes in accordance with the situation in my country. The dimensional tolerance, mechanical properties and flattening deformation coefficient of this standard are equivalent to those of the Japanese standard. The length tolerance is stricter than that of this standard. This standard is to be revised, and the following clauses are modified: 1 The dimensional tolerance index is modified. The original standard table 1 and table 2 specifications were cancelled and replaced with the specifications in table 1 of GB/T17395:1998:
2 New grades were added;
3 Mechanical performance indicators were modified:
4 The content of the flattening test was modified;
5 The original Appendix A was cancelled and incorporated into the standard text. From the date of implementation of this standard: Replace GB/F8162-1987 Seamless Steel Pipe for Structural Use 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 Co., Ltd., Chengdu Seamless Steel Pipe Co., Ltd. The main drafters of this standard are: Chen Jian, 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 structural purposes
Seamless steel tubes for structural purposesGB/T 8162
Replaces GB/T 8162-1987
This standard specifies the size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of structural old smooth seam steel tubes.
This standard applies to seamless steel tubes for general structures and mechanical structures. 2 Referenced 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/T 222-1984 Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products Chemical analysis methods for steel and alloys - Reduced silicate photometric method for determination of acid-soluble silicon content GB/T 223.5-19974
GB/T 223.8-1991 Chemical analysis methods for steel and alloys - Fluoride steel separation - EDTA volumetric method for determination of aluminium content GB/T 223.11-1991
Chemical analysis methods for steel and alloys - Ammonium persulfate oxidation volumetric method for determination of chromium content GB/T 223.12-1991
GB/T 223.14-1989
GB/T 223.16--1991
GB/T 223.25--1994
GB/T 223.26 -1989
GB/T 223. 54 -1987
GB/T 223. 60--1997
GB/T 223. 62—1988
GB/T 223. 64--1988
GB/T 223. 69 — 1997 | | tt | 242—1997
GB/T 244—1997
GB/T 246--1997
GB/T 6991999
GB/T 15911994
Methods for chemical analysis of iron, steel and alloys: Sodium carbonate separation-diphenylcarbazide photometric method for the determination of chromium content in iron, steel and alloys
Methods for chemical analysis of iron, steel and alloys: Determination of vanadium content by extraction photometric method with chrysogenum reagent
Methods for chemical analysis of iron, steel and alloys
Methods for chemical analysis of iron, steel and alloys
Methods for chemical analysis of iron, steel and alloys
Chromotropic acid photometric method for the determination of titanium content
Determination of nickel content by diacetyl gravimetric method
Thiocyanate direct photometric method for the determination of vanadium content
Methods for chemical analysis of iron, steel and alloys Analysis method
Determination of nickel content by flame atomic absorption spectrophotometry Chemical analysis method for steel and alloys
Chemical analysis method for steel and alloys
Chemical analysis method for steel and alloys
Chemical analysis film method for steel and alloys
Chemical analysis method for steel and alloys
Chemical analysis method for steel and alloys
Metal tensile test method
Metal Charpy notched impact test method
Metal Brinell hardness test method
Metal pipe expansion test method Test method
Metal tube bending test method
Metal tube flattening test method
High-quality carbon structural steel
Low-alloy high-strength structural steel
Approved by the State Administration of Quality and Technical Supervision on November 1, 1999 Determination of silicon content by gravimetric method with peroxyacid dehydration
Determination of phosphorus content by acetaldehyde butyl ester extraction photometry
Determination of manganese content by flame atomic absorption spectrometry
Determination of carbon content by gas volumetric method after combustion in a tube furnace Determination of sulfur content by gravimetric method with alumina chromatography-barium sulfate Methanol steam tank-curcumin photometric method for determination of boron content 2000-08-01 implementation
GB/T2102—1988
GB/T3077—1999
GB/T5777—1996
GB/T173951998
YB/T5221—1993
YB/T5222—1993
3 Dimensions, shape, weight
3.1 Outer diameter and wall thickness
GB/T 8162—1999
Acceptance, packaging, marking and quality certificate of steel pipes Alloy structural steel
Ultrasonic flaw detection inspection method for seamless steel pipes
Dimensions, shape, weight and allowable deviations of seamless steel pipes Alloy structural steel round pipes are broken
High-quality carbon steel round pipes are broken
Steel pipes are divided into hot-rolled (extruded, expanded) and cold-drawn (two types. The outer diameter and wall thickness shall comply with the provisions of GB/T17395 3.2 Allowable deviations of outer diameter and wall thickness
The allowable deviations of the outer diameter and wall thickness of steel pipes shall comply with the provisions of Table 1. When the purchaser specifies the allowable deviation of the steel pipe size in advance in the contract, the allowable deviations of the outer diameter and wall thickness of the steel pipe shall be supplied according to the grade. According to the purchaser's requirements, after negotiation between the supplier and the purchaser, and indicated in the contract, steel pipes with allowable deviations of the outer size specified in Table 1 can be produced. Table
Types of steel pipes
Hot-rolled (extruded
Expanded> pipes
Cold-drawn (rolled) pipes
Allowable deviations of outer diameter and wall thickness
Ordinary grade
No. 1
Note: For hot-expanded pipes with an outer diameter not less than 351mm, the overall thickness deviation 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, The allowable deviation of length is as follows: Length 6000mm
±10% (minimum value is +0.30mm)
3000-12000mm
2000-10500mm
Length 6000mm
GB/T81621999
The total length of the steel pipe should be within the usual length range, and the allowable deviation of the total length should leave a cut margin for each multiple length according to the following provisions: Outer diameter 159mm
Outer diameter ≥159mm
3.3.3 Range length
The range length of the steel pipe should be within the usual length range: 3.4 Curvature
The curvature of the steel pipe shall not be greater than the following provisions: wall thickness ≤15mm
wall thickness>15mm~30mm
wall thickness>30mm or outer diameter No. 3
3.5 End shape
The end faces of both ends of the steel pipe should be perpendicular to the cap
3.6 Delivery weight
The outlet line should be perpendicular, and the burrs on the cut should be removed
3.6.1 The delivery weight of the steel pipe is based on the current provisions of /B/T17395 (the density of steel is calculated as 7.85kg/dm) 3.6.2 Permissible weight deviation
5~10mm
10~15mm
According to the requirements of the purchaser, the supply and demand parties negotiate and indicate in the contract that the allowable deviation between the actual weight and theoretical weight of the delivered steel pipe is: S
Single grain steel pipe: ±1 0
Each batch is at least 10
3.7 Marking example
Pipe: soil 7.5%.
Use No. 10 steel to make a steel pipe with a diameter of 73mm and a wall thickness of 3.5mm: a) Hot-rolled steel pipe, length 8000mm multiples 10-73×3.5×3
b) Cold-drawn (rolled) steel pipe
Cold 10-73 high X3
4 Technical requirements
times - GB/T816
for high-grade precision, wall thickness for ordinary-grade precision, length 5000mm00-GB/T
4.1 Steel grades and chemical composition
4.1.7 Steel pipes are made of 10.20, 35.45.034# and steel grades specified in Table 3. According to the requirements of the buyer, other grades of steel pipes can be produced after the supplier and the buyer have agreed. 4.1.2 Steel grades and chemical composition (melting analysis) should comply with the provisions of GB/T-699 GB/T1591 or GB/T3077. Steel pipes are accepted according to the melting composition.
4.1.3 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/T222-1984
4.2 Manufacturing method
4.2.1 Manufacturing method of steel
Steel shall be smelted by electric furnace, open hearth furnace or oxygen converter. Other manufacturing methods may also be used after consultation between the supply and demand parties. When the purchaser specifies a manufacturing method, it shall be indicated in the contract. 4.2.2 Manufacturing method of pipe
Pipe can be manufactured by hot rolling (forging), and hot rolled (forged) pipe shall comply with the provisions of YB/T5221 or YB/T5222. Continuous rolling or steel ingots may also be used.
4.2.3 Manufacturing method of steel pipe
GB/T 81621999
Steel pipes shall be manufactured by hot rolling (extrusion, expansion) and cold drawing (rolling) seamless methods. When the purchaser specifies a certain manufacturing method, it shall be indicated in the contract. 4.3 Delivery status
Hot-rolled (extrusion, expansion) steel pipes shall be delivered in hot-rolled state or heat-treated state: cold-drawn (rolled) steel pipes shall be delivered in heat-treated state. According to the requirements of the purchaser and after negotiation between the supply and demand parties, they can also be delivered in cold-drawn (rolled) state. 4.4 Mechanical properties
4.4.1 The longitudinal mechanical properties of high-quality carbon steel and low-alloy steel tubes delivered in hot-rolled state or heat-treated (normalized or tempered) state shall comply with the provisions of Table 2; the longitudinal mechanical properties of alloy structural steel samples made of heat-treated rough pieces and the Brinell hardness of steel tubes in annealing or high-temperature tempering supply state shall comply with the provisions of Table 3; the mechanical properties of steel tubes delivered in cold-rolled (rolled) state shall be negotiated by the supply and demand parties. Table 2 Longitudinal mechanical properties of high-quality carbon steel and low-fraction steel pipes Tensile strength
bamboo is steel pipe diameter,
ss16 mm
bending point MPa
steel pipe wall thickness
>16~30 mm
not less than
the minimum value of the plate spacing (H) of the pressure fan test should be 5 times the steel pipe wall thickness Table 3 Mechanical properties of alloy steel pipes
Heat treatment
27SiMn
Temperature, heart
first tempering second tempering
* × 880
* * 880
Coolant
Temperature, coolant
water, oil
water, oil
water, oil
water, air
water, oil
water, oil
water, oil
water, oil
≥30 mm
Mechanical properties
Tensile strength
Elongation after fracture
Pressure fan test
Span between plates
Steel pipe annealing or high temperature
Elongation after fracture
Not less than
Rate, a
Tempering supply state
Brinell hardness
Not more than
20CrMo
35CrMt
12C-Ma
12CrMoV
12 CrlMoy
380-MoAl
50CrVA
20CrMn
20CrMnSi
3CrMnSi
35CrMnSiA
20C-MnTi
30CrMnTi
12CrNi2
12CrNi3
40CNiMoA
3345CrNiMoVA
GB/T 8162 -1999
Table 3 (end)
Heat treatment
Coolant
First quenching Second quenching
* * 880
×*880
* * 881
Water, oil
Water, oil
Water, oil
Water, oil
Water, oil
Water, oil
Water, oil
Water, corrosion
Water, air
Water, air
Water, air
Water, air
Water, shaft
Mechanical properties
Steel pipe annealing or high temperaturebZxz.net
Tensile strengthElongation after fracture
Rate,!
Not less than
￥835
1 The allowable adjustment range of the heat treatment temperature listed in the table is high temperature tempering +20, low temperature tempering ±30, high temperature tempering +50℃. 2 Normalizing can be used before tempering for chromium-manganese-titanium steel. Normalizing can be used instead of tempering for the first time. 3: Delivery can be made according to one of the data.
4**Isothermal annealing at 280-~320℃,
5No Brinell hardness test for steel back with wall thickness less than 5mm%
Tempering supply state
Brinell hardness
Not greater than
4.4.2According to the purchaser's requirements, after consultation between the supply and demand parties and indicated in the contract, steel pipes with an outer diameter greater than 57mm and a wall thickness of not less than 14mm can be subjected to room temperature V-type impact test, and the impact energy shall be filled in the quality certificate. For alloy structural steel pipes, the cross-sectional shrinkage rate of the sample after heat treatment can be provided, and its value shall comply with the provisions of GB/T3077. 4.5 Process Test
4.5.1 Fan-Compression Test
For steel pipes made of 10, 20, Q345 steel, with an outer diameter of 22~~400mm and a ratio of wall thickness to outer diameter of not more than 10%, a flattening test shall be carried out, and the plate spacing H value shall comply with the provisions of Table 2. After the flattening test, the sample shall be free of cracks or splits. 4.5.2 Expansion Test
According to the requirements of the purchaser, after consultation between the supply and demand parties and indicated in the contract, a expansion test may be carried out for steel pipes with a wall thickness of less than 8m, and the concentric taper shall be one of 30°, 45°, and 60°. After expansion, no cracks or splits shall appear in the sample. The expansion rate of the outer diameter of the expansion sample shall comply with the provisions of Table 4. 5
Superior carbon steel
Low alloy steel
4.5.3 Bending test
GB/T81621999
Table 4 Expansion rate of outer diameter of steel pipe
External diameter of steel pipe, related
Inner diameter/outer diameter
≥0.6~0.8
According to the requirements of the buyer, after the 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, a bending radius of 6 times the outer diameter of the steel pipe, and no cracks or fissures shall appear at the bending point. 4.6 Surface quality
The inner and outer surfaces of the steel pipe shall not have wrinkles, folds, rolling folds, delamination and scarring. These defects must be completely removed, and the actual wall thickness at the removed part 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 thickness are allowed to exist. 4.7 Ultrasonic test According to the requirements of the purchaser, the supply and demand parties shall negotiate and indicate in the contract that the steel pipe can be subjected to ultrasonic test, and the depth level of the longitudinal notch on the outer surface of the sample pipe shall comply with the provisions of Appendix C10 of 1996. 5 Test method 5.1 The size of the steel pipe shall be measured with measuring tools that meet the accuracy requirements. 5.2 The surface of the steel pipe shall be visually inspected one by one under sufficient lighting conditions. Other inspection items of the steel pipe shall comply with the provisions of Table 5. Table 5 Test area Flattening test Expanding test Bending test Hardness test V-plastic impact test Ultrasonic test Inspection rules tt||6.1 Inspection and acceptance
Test methods
GB/T222
GB/T223
G/T228
GBAT246
QOB/T244
GB/T231
GBT229
GB/T5777
Steel pipe inspection items||t t||Take 1 sample from each furnace (tank)
Take
samples from each of the two steel pipes in each batch
Take one sample from each of the two steel pipes in each batch
Take one sample from each of the two steel pipes in each batch
Take one sample from each of the two steel pipes in each batch
Take three samples from each of the two steel pipes in each batch
The inspection and acceptance of steel pipes shall be carried out by the technical supervision department of the supplier. 6.2 Batch rules
Steel pipes shall be inspected and accepted in batches. Each batch shall consist of steel pipes of the same brand, furnace (tank), specification and heat treatment system (furnace): The number of steel pipes in each batch shall not exceed the following provisions: outer diameter not more than 76mm, wall thickness not more than 3mm, 6
400 pieces
outer diameter greater than 351mt
other size copper pipes
GB/T 81621999
: 200 pieces
If the number of remaining steel pipes is not less than 50% of the above provisions, they shall be listed as a separate batch. If it is less than 50% of the above provisions, they can be incorporated into the adjacent batch of the same brand, furnace (tank) number and specification. If 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 brand and specification from different furnaces (tanks). 6.3 Sampling quantity
The sampling quantity for each batch of steel pipes for various performance tests shall comply with the provisions of Table 5. 6.4 Re-inspection and judgment rules
The re-inspection and judgment rules for steel pipes shall comply with the provisions of GB/T 2102. 7 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the provisions of GB/T2102.
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