Some standard content:
ICS 77.140.20
National Standard of the People's Republic of China
GB/T4172—2000
Atmospheric corrosion resisting steel for welded structure2000-10-25Promulgated
Implementation on 2001-09-01
Promulgated by the State Administration of Quality and Technical Supervision
GB/T 4172—2000
This standard is revised on GB/T4172--1984 Weathering Steel for Welded Structure based on the development and application of weathering steel and with reference to relevant international and domestic standards.
This standard modifies the following major technical contents in this revision: Change the method of indicating the grade;
Adjust the chemical composition and properties of each grade; Add some provisions and clauses.
This standard replaces GB/T4172-1984 Weathering Steel for Welded Structures from the date of implementation. Appendix A of this standard is a reminder appendix.
This standard was proposed by the State Metallurgical Industry Bureau. This standard is under the jurisdiction of the National Steel Standardization Technical Committee. This standard was drafted by the Metallurgical Industry Information Standardization Research Institute and Wuhan Iron and Steel Group Co., Ltd. The main drafters of this standard are Tang Yifan, Huang Lai, Yao Ka, Luan Yan, Deng Lianxian, and Liu Baoshi. This standard was first issued in February 1984.
1 Scope
National Standard of the People's Republic of China
Weathering steel for welded structure
Atmospheric corrosion resisting steel for welded structureGB/T 4172-2000
Replaces GB/T 4172-1984
This standard specifies the definition, dimensions, appearance, technical requirements, test methods, acceptance rules, packaging, marking, quality certificate, etc. of weathering steel for welded structure
This standard applies to hot-rolled steel with weather resistance for bridges, buildings and other structural parts, including steel plates, steel strips and steel sections with a thickness of up to 100 mm.
2 Referenced standards
The provisions contained in the following references constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T222-1584 Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products GB/T 223.3-1988 Chemical analysis methods for steel and alloys - Diantipyryl methane phosphomolybdic acid gravimetric method for determination of phosphorus content GB/T 223.5-1997 Chemical analysis methods for steel and alloys - Reduced molybdenum silicate photometric method for determination of acid-soluble silicon content Chemical analysis methods for steel and alloys - Fluoride steel separation - EI)FA volumetric method for determination of aluminium content GB/T 223.8-1991 GB/T223.9-1989 Chemical analysis methods for steel and alloys - Chrome azure S photometric method for determination of aluminium content GB/T 223.10-1991 GB/T 223.11---1991 GB/T 223-14—1989
GB/T 223. 16—1991
GB/T 223. 191989
GB/T 223.23—1994
GB/T 223. 24—1994
GB/T 223.261989
GB/T 223.27—1994
G3/T 223. 30—1994
CB/T 223. 39—1994
GB/T 223. 40--·1985
CB/T 223. 53—1987
GB/T 223. 58—1987
GB/T 223.591987
GB/T 223. 601997
GB/T 223. 61—1988
GB/T 223. 621988
GB/T 223. 63—1988
Methods for Chemical Analysis of Iron, Steel and AlloysSeparation of Ironmaking Reagents-Chrome Azure S Spectrophotometric Determination of Aluminium ContentAmmonium Persulfate Oxidation Capacitive Determination of Chromium Content
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
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
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
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||t t||Chemical analysis methods for steel and alloys
Determination of vanadium content by vanadium reagent extraction photometric method
Determination of titanium content by chromotropic acid photometric method
Determination of copper content by acetylene-chloroethane extraction photometric methodDetermination of nickel content by diacetylene spectrophotometric method
Extraction separation-acetylene-chloroethane spectrophotometric methodDetermination of nickel content by thiocyanate direct photometric methodDetermination of vanadium content by thiocyanate-acetate extraction spectrophotometric methodDetermination of vanadium content by acetylene-chloroethane Chemical analysis methods for steel and alloys
Precipitation separation of p-bromopicrin-azobisphenol A Photometric determination of zirconium content
Chemical analysis methods for steel and alloys
Chlorosulfonphenol S photometric determination of tungsten content
Chemical analysis methods for steel and alloys
Ion exchange separation-chlorosulfonphenol S photometric determination of niobium content Chemical analysis methods for steel and alloys
Flame atomic absorption spectrophotometric determination of copper content Chemical analysis methods for steel and alloys
Sodium arsenite-sodium nitrite titration determination of manganese strip Chemical analysis methods for steel and alloys
Ladder phosphorus clamp blue photometric determination of phosphorus content|| tt||Methods for Chemical Analysis of Iron, Steel and Alloys-The Perchloric Acid Dehydration Gravimetric Method for Determination of Silicon Content-Methods for Chemical Analysis of Iron, Steel and Alloys
The Ammonium Phosphomolybdate Volumetric Method for Determination of Phosphorus Content
Methods for Chemical Analysis of Iron, Steel and Alloys
The Butyl Acetate Benzene Photometric Method for Determination of Phosphorus Content
Methods for Chemical Analysis of Iron, Steel and Alloys
The Sodium (Potassium) Periodate Photometric Method for Determination of Manganese Content
Approved by the State Administration of Quality and Technical Supervision on October 25, 2000 and implemented on September 1, 2001
GB/T 4172 -- 2000
Methods for chemical analysis of steel, iron and alloy
GB/T 223. 64-1988
Determination of manganese content by flame atomic absorption spectrometry
GB/T 223. 68—1997
GB/T 223. 69—1997
Determination of sulfur content by potassium iodate titration after combustion in a tubular furnaceMethods for chemical analysis of steel, iron and alloy
Methods for chemical analysis of steel, iron and alloyDetermination of carbon content by gas volumetric method after combustion in a tubular furnaceChemical analysis of steel, iron and alloyDetermination of carbon content by gravimetric method after combustion in a tubular furnaceGB/T 223. 71---1997
GB/T223.72—1991Methods for chemical analysis of steel, iron and alloyCB/T228—1987Methods for tensile testing of metalsGB/T 229—1994
Metal Charpy notched impact test method
GR/T232-1999 Bend test method for metallic materials Determination of sulfur content by alumina chromatography-sulfuric acid gravimetric method GB/T247—1997General provisions for acceptance, packaging, marking and quality certification of steel plates and strips GB/T 709 --1988
Size, shape, weight and permissible deviation of hot-rolled steel plates and strips General provisions for acceptance, packaging, marking and quality certification of profiled steel GB/T 2101 1989
GB/T 2975—1998
Sampling location and specimen preparation for mechanical properties test of steel and steel products GB/T17505—1998
General technical requirements for delivery of steel and steel products
3 Definitions
This standard adopts the following definitions:
Weathering steel is steel resistant to atmospheric corrosion.
Weathering steel for welded structures is made by adding a small amount of alloying elements such as Cu, CrVi, etc. to the steel to form a protective layer on the surface of the metal matrix to improve the weathering resistance of the steel while maintaining good welding performance. 4 Classification and code
4.1 Classification
Steel is divided into two categories according to the delivery state:
a) Delivery in hot-rolled or normalized state:
b) Delivery in quenched and tempered state.
4.2. Grade designation method
The grade of steel consists of the Chinese phonetic letters representing "yield point" and "weather resistance" and the number of the yield point, and the quality grade code (C, D, F) is added after the grade.
For example: Q355NIIC, Q460NHD
Q-yield point "yield" is the first letter of the Chinese phonetic letter: NH...is the first letter of the Chinese phonetic letter of the two characters "resistance" and "weather" respectively; 355.460-the number of the yield point, unit.MPa. 5. Dimensions and shape and their allowable deviations
The size, shape and allowable deviation of steel plates and steel strips shall comply with the relevant provisions of GB/T709. 5.1
5.2 The size, shape and allowable deviation of steel sections shall comply with the provisions of relevant standards. 6. Technical requirements
6.1 Grade and chemical composition
6.1.1 The grade and chemical composition of steel shall comply with the provisions of Table 1. 6.1.2 The lower limit of silicon content of Q235NH and Q295NH can be 0.10%, and the lower limit of manganese content of Q355NH can be 0.60. 6.1.3 In order to improve the performance of steel, each grade can add one or more trace alloy elements. Ni≤0.65%Nb0.015%0.050%,V0.02%~-0.15%,Ti0.02%~0.10%,Mo≤0.30%,Zr≤0.15,A120.020%. 6.1.4 The allowable deviation of chemical composition of finished steel and steel bar shall comply with the provisions of GB/T222.2
Q235NH
Q355NH
Q460NH
Uniform digital
L52950
［53550
L54600
GB/T4172—2000
Chemical composition,
0.21] ~-
6.2 Smelting method
Steel is smelted by oxygen converter or electric furnace. Unless the purchaser has special requirements, the smelting method shall be selected by the supplier. 6.3 Delivery status
.40 ~-
All grades of steel are delivered in hot-rolled, controlled-rolled or normalized states. Q460VH can be delivered in the state of fire-assisted heating. 6.4 Mechanical properties and process properties
6.4.1 The mechanical properties and process properties of steel shall comply with the provisions of Table 2. Table 2
Q235NH
Q295NH
Q355NH
Q4GCNH
>16-40
240--60
1G~～40
>-40~60
>60～100
216~40
>40~-60
→60~-100
>1 6~40
>40~-60
>60～100
Spot
Not less than
Note: d is the bending diameter a is the steel thickness
360-~490
420--560
490~630
550-~710
Elongation
Not less than
id=2a
d-- 2a
V-type punch-out test
Impact edge
Not less than
GB/T 4172—2000
6.4.2 The impact test result is calculated as the average value of three specimens. It is allowed that the single value of one specimen is lower than the value specified in Table 2, but it shall not be lower than 70% of the specified value.
6.4.3 When a small-size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm is used for impact test, the test result shall not be less than 50% or 75% of the value specified in Table 2. 6.5 Surface quality
6.5.1 The surface of steel shall not have cracks, bubbles, scars, inclusions, or folds. Steel shall not have delamination. If there are the above defects on the surface, it is allowed to be removed, and the depth of elimination shall not exceed half of the steel thickness tolerance. The removed area shall be smooth and without edges and corners, and the surface defects of the steel shall not be removed horizontally. Other defects that do not affect the use are allowed to exist, but the minimum thickness of the steel should be guaranteed. 6.5.2 Steel strips can be delivered with defects, and the defective part shall not exceed 10% of the total length of the steel strip. 7 Test method
7.1 The inspection items, sampling quantity, sampling method and test method of each batch of steel shall comply with the provisions of Table 3. Table 3
Test Item Date
Classification
Sample Quantity
1 (for each furnace tank number)
Sampling Method
GB/T222
GB/T 2975
GB/T2975
GB/T2975
Test Method
GB/T223
GB/T 228
GB/T 232
GB/T 229
7.2 When the steel plate, steel strip and steel section with a thickness of 6~<12mm or the steel bar with a diameter of 12~16mm is subjected to impact test, a small size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm shall be used. One rolling surface of the impact specimen may be retained. 8 Inspection rules
8.1 Steel products shall be inspected and accepted by the supplier's technical supervision department. If necessary, the purchaser has the right to conduct inspections in accordance with the provisions of this standard: 8.2 Steel products shall be accepted in batches. Each batch shall consist of steel products of the same furnace number, the same type, the same size, the same rolling system and the same delivery status, and the weight shall not exceed 60t.
8.3 Re-inspection
8.3.1 If the impact test results do not meet the requirements of the Taiwan regulations, 3 more samples shall be taken from the same sheet (roll) or a piece of steel for testing. The average value of the 6 consecutive samples shall not be less than the specified value in Table 3. It is allowed that 2 samples are lower than the specified value, but only 1 sample is allowed to be lower than 70% of the specified value.
8.3.2 Other re-inspections of steel products shall comply with the provisions of GB/T247, GB/T210I or G13/T17505. 9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel shall comply with the provisions of GB/T247 and GB/T2101. GB/T 4172—2000
Appendix A
(Suggestive Appendix)
Comparison table of new white grades
The comparison of new and old grades of weathering steel for welding structure is shown in Table A1. Table Al
Q235NH
Q295NH
Q355NH
Q160NH
16CuCr
12MnCutr
15Macucr
15MnCuCr-QT
People's Republic of China
National Standard
Weathering Steel for Welding Structure
GB/T4 172—3000
Published by China Standard Press
No. 16, Erlihebei Street, Fuxingmenwai, Beijing
Postal code: 100045
Tel: 68522112
Printed by China Standard Publishing House, Qinhuangdao Printing Factory, Xinhua Bookstore, Beijing Distribution Office, Sold by Xinhua Bookstores in all regions, exclusive copyright, no reproduction allowed
Print sheet 3/4 Number of words [0 thousand words
Format 880×1230 1/16
Edition in March 2001
First printing in March 2001
Print run 1—3 G00
Book number: 155066·1-17426
Price 8.00 yuan
Keri 562-4953 In order to improve the performance of steel, one or more trace alloying elements can be added to each grade. Ni≤0.65%Nb0.015%0.050%,V0.02%~-0.15%,Ti0.02%~0.10%,Mo≤0.30%,Zr≤0.15,A120.020%. 6.1.4 The allowable deviation of chemical composition of finished steel and steel bar shall comply with the provisions of GB/T222.2
Q235NH
Q355NH
Q460NH
Uniform digital
L52950
［53550
L54600
GB/T4172—2000
Chemical composition,
0.21] ~-
6.2 Smelting method
Steel is smelted by oxygen converter or electric furnace. Unless the purchaser has special requirements, the smelting method shall be selected by the supplier. 6.3 Delivery status
.40 ~-
All grades of steel are delivered in hot-rolled, controlled-rolled or normalized states. Q460VH can be delivered in the state of fire-assisted heating. 6.4 Mechanical properties and process properties
6.4.1 The mechanical properties and process properties of steel shall comply with the provisions of Table 2. Table 2
Q235NH
Q295NH
Q355NH
Q4GCNH
>16-40
240--60
1G~～40
>-40~60
>60～100
216~40
>40~-60
→60~-100
>1 6~40
>40~-60
>60～100
Spot
Not less than
Note: d is the bending diameter a is the steel thickness
360-~490
420--560
490~630
550-~710
Elongation
Not less than
id=2a
d-- 2a
V-type punch-out test
Impact edge
Not less than
GB/T 4172—2000
6.4.2 The impact test result is calculated as the average value of three specimens. It is allowed that the single value of one specimen is lower than the value specified in Table 2, but it shall not be lower than 70% of the specified value.
6.4.3 When a small-size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm is used for impact test, the test result shall not be less than 50% or 75% of the value specified in Table 2. 6.5 Surface quality
6.5.1 The surface of steel shall not have cracks, bubbles, scars, inclusions, or folds. Steel shall not have delamination. If there are the above defects on the surface, it is allowed to be removed, and the depth of elimination shall not exceed half of the steel thickness tolerance. The removed area shall be smooth and without edges and corners, and the surface defects of the steel shall not be removed horizontally. Other defects that do not affect the use are allowed to exist, but the minimum thickness of the steel should be guaranteed. 6.5.2 Steel strips can be delivered with defects, and the defective part shall not exceed 10% of the total length of the steel strip. 7 Test method
7.1 The inspection items, sampling quantity, sampling method and test method of each batch of steel shall comply with the provisions of Table 3. Table 3
Test Item Date
Classification
Sample Quantity
1 (for each furnace tank number)
Sampling Method
GB/T222
GB/T 2975
GB/T2975
GB/T2975
Test Method
GB/T223
GB/T 228
GB/T 232
GB/T 229
7.2 When the steel plate, steel strip and steel section with a thickness of 6~<12mm or the steel bar with a diameter of 12~16mm is subjected to impact test, a small size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm shall be used. One rolling surface of the impact specimen may be retained. 8 Inspection rules
8.1 Steel products shall be inspected and accepted by the supplier's technical supervision department. If necessary, the purchaser has the right to conduct inspections in accordance with the provisions of this standard: 8.2 Steel products shall be accepted in batches. Each batch shall consist of steel products of the same furnace number, the same type, the same size, the same rolling system and the same delivery status, and the weight shall not exceed 60t.
8.3 Re-inspection
8.3.1 If the impact test results do not meet the requirements of the Taiwan regulations, 3 more samples shall be taken from the same sheet (roll) or a piece of steel for testing. The average value of the 6 consecutive samples shall not be less than the specified value in Table 3. It is allowed that 2 samples are lower than the specified value, but only 1 sample is allowed to be lower than 70% of the specified value.
8.3.2 Other re-inspections of steel products shall comply with the provisions of GB/T247, GB/T210I or G13/T17505. 9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel shall comply with the provisions of GB/T247 and GB/T2101. GB/T 4172—2000
Appendix A
(Suggestive Appendix)
Comparison table of new white grades
The comparison of new and old grades of weathering steel for welding structure is shown in Table A1. Table Al
Q235NH
Q295NH
Q355NH
Q160NH
16CuCr
12MnCutr
15Macucr
15MnCuCr-QT
People's Republic of China
National Standard
Weathering Steel for Welding Structure
GB/T4 172—3000
Published by China Standard Press
No. 16, Erlihebei Street, Fuxingmenwai, Beijing
Postal code: 100045
Tel: 68522112
Printed by China Standard Publishing House, Qinhuangdao Printing Factory, Xinhua Bookstore, Beijing Distribution Office, Sold by Xinhua Bookstores in all regions, exclusive copyright, no reproduction allowed
Print sheet 3/4 Number of words [0 thousand words
Format 880×1230 1/16
Edition in March 2001
First printing in March 2001
Print run 1—3 G00
Book number: 155066·1-17426
Price 8.00 yuan
Keri 562-4953 In order to improve the performance of steel, one or more trace alloying elements can be added to each grade. Ni≤0.65%Nb0.015%0.050%,V0.02%~-0.15%,Ti0.02%~0.10%,Mo≤0.30%,Zr≤0.15,A120.020%. 6.1.4 The allowable deviation of chemical composition of finished steel and steel bar shall comply with the provisions of GB/T222.2
Q235NH
Q355NH
Q460NH
Uniform digital
L52950
［53550
L54600
GB/T4172—2000
Chemical composition,
0.21] ~-
6.2 Smelting method
Steel is smelted by oxygen converter or electric furnace. Unless the purchaser has special requirements, the smelting method shall be selected by the supplier. 6.3 Delivery status
.40 ~-
All grades of steel are delivered in hot-rolled, controlled-rolled or normalized states. Q460VH can be delivered in the state of fire-assisted heating. 6.4 Mechanical properties and process properties
6.4.1 The mechanical properties and process properties of steel shall comply with the provisions of Table 2. Table 2
Q235NH
Q295NH
Q355NH
Q4GCNH
>16-40
240--60
1G~～40
>-40~60
>60～100
216~40
>40~-60
→60~-100
>1 6~40
>40~-60
>60～100
Spot
Not less than
Note: d is the bending diameter a is the steel thickness
360-~490
420--560
490~630
550-~710
Elongation
Not less than
id=2a
d-- 2a
V-type punch-out test
Impact edge
Not less than
GB/T 4172—2000
6.4.2 The impact test result is calculated as the average value of three specimens. It is allowed that the single value of one specimen is lower than the value specified in Table 2, but it shall not be lower than 70% of the specified value.
6.4.3 When a small-size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm is used for impact test, the test result shall not be less than 50% or 75% of the value specified in Table 2. 6.5 Surface quality
6.5.1 The surface of steel shall not have cracks, bubbles, scars, inclusions, or folds. Steel shall not have delamination. If there are the above defects on the surface, it is allowed to be removed, and the depth of elimination shall not exceed half of the steel thickness tolerance. The removed area shall be smooth and without edges and corners, and the surface defects of the steel shall not be removed horizontally. Other defects that do not affect the use are allowed to exist, but the minimum thickness of the steel should be guaranteed. 6.5.2 Steel strips can be delivered with defects, and the defective part shall not exceed 10% of the total length of the steel strip. 7 Test method
7.1 The inspection items, sampling quantity, sampling method and test method of each batch of steel shall comply with the provisions of Table 3. Table 3
Test Item Date
Classification
Sample Quantity
1 (for each furnace tank number)
Sampling Method
GB/T222
GB/T 2975
GB/T2975
GB/T2975
Test Method
GB/T223
GB/T 228
GB/T 232
GB/T 229
7.2 When the steel plate, steel strip and steel section with a thickness of 6~<12mm or the steel bar with a diameter of 12~16mm is subjected to impact test, a small size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm shall be used. One rolling surface of the impact specimen may be retained. 8 Inspection rules
8.1 Steel products shall be inspected and accepted by the supplier's technical supervision department. If necessary, the purchaser has the right to conduct inspections in accordance with the provisions of this standard: 8.2 Steel products shall be accepted in batches. Each batch shall consist of steel products of the same furnace number, the same type, the same size, the same rolling system and the same delivery status, and the weight shall not exceed 60t.
8.3 Re-inspection
8.3.1 If the impact test results do not meet the requirements of the Taiwan regulations, 3 more samples shall be taken from the same sheet (roll) or a piece of steel for testing. The average value of the 6 consecutive samples shall not be less than the specified value in Table 3. It is allowed that 2 samples are lower than the specified value, but only 1 sample is allowed to be lower than 70% of the specified value.
8.3.2 Other re-inspections of steel products shall comply with the provisions of GB/T247, GB/T210I or G13/T17505. 9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel shall comply with the provisions of GB/T247 and GB/T2101. GB/T 4172—2000
Appendix A
(Suggestive Appendix)
Comparison table of new white grades
The comparison of new and old grades of weathering steel for welding structure is shown in Table A1. Table Al
Q235NH
Q295NH
Q355NH
Q160NH
16CuCr
12MnCutr
15Macucr
15MnCuCr-QT
People's Republic of China
National Standard
Weathering Steel for Welding Structure
GB/T4 172—3000
Published by China Standard Press
No. 16, Erlihebei Street, Fuxingmenwai, Beijing
Postal code: 100045
Tel: 68522112
Printed by China Standard Publishing House, Qinhuangdao Printing Factory, Xinhua Bookstore, Beijing Distribution Office, Sold by Xinhua Bookstores in all regions, exclusive copyright, no reproduction allowed
Print sheet 3/4 Number of words [0 thousand words
Format 880×1230 1/16
Edition in March 2001
First printing in March 2001
Print run 1—3 G00
Book number: 155066·1-17426
Price 8.00 yuan
Keri 562-4951The mechanical properties and process properties of steel shall conform to the provisions of Table 2. Table 2
Q235NH
Q295NH
Q355NH
Q4GCNH
>16-40
240--60
1G~～40
>-40~60
>60～100
216~40
>40~-60
→60~-100
>1 6~40
>40~-60
>60～100
Spot
Not less than
Note: d is the bending diameter a is the steel thickness
360-~490
420--560
490~630
550-~710
Elongation
Not less than
id=2a
d-- 2a
V-type punch-out test
Impact edge
Not less than
GB/T 4172—2000
6.4.2 The impact test result is calculated as the average value of three specimens. It is allowed that the single value of one specimen is lower than the value specified in Table 2, but it shall not be lower than 70% of the specified value.
6.4.3 When a small-size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm is used for impact test, the test result shall not be less than 50% or 75% of the value specified in Table 2. 6.5 Surface quality
6.5.1 The surface of steel shall not have cracks, bubbles, scars, inclusions, or folds. Steel shall not have delamination. If there are the above defects on the surface, it is allowed to be removed, and the depth of elimination shall not exceed half of the steel thickness tolerance. The removed area shall be smooth and without edges and corners, and the surface defects of the steel shall not be removed horizontally. Other defects that do not affect the use are allowed to exist, but the minimum thickness of the steel should be guaranteed. 6.5.2 Steel strips can be delivered with defects, and the defective part shall not exceed 10% of the total length of the steel strip. 7 Test method
7.1 The inspection items, sampling quantity, sampling method and test method of each batch of steel shall comply with the provisions of Table 3. Table 3
Test Item Date
Classification
Sample Quantity
1 (for each furnace tank number)
Sampling Method
GB/T222
GB/T 2975
GB/T2975
GB/T2975
Test Method
GB/T223
GB/T 228
GB/T 232
GB/T 229
7.2 When the steel plate, steel strip and steel section with a thickness of 6~<12mm or the steel bar with a diameter of 12~16mm is subjected to impact test, a small size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm shall be used. One rolling surface of the impact specimen may be retained. 8 Inspection rules
8.1 Steel products shall be inspected and accepted by the supplier's technical supervision department. If necessary, the purchaser has the right to conduct inspections in accordance with the provisions of this standard: 8.2 Steel products shall be accepted in batches. Each batch shall consist of steel products of the same furnace number, the same type, the same size, the same rolling system and the same delivery status, and the weight shall not exceed 60t.
8.3 Re-inspection
8.3.1 If the impact test results do not meet the requirements of the Taiwan regulations, 3 more samples shall be taken from the same sheet (roll) or a piece of steel for testing. The average value of the 6 consecutive samples shall not be less than the specified value in Table 3. It is allowed that 2 samples are lower than the specified value, but only 1 sample is allowed to be lower than 70% of the specified value.
8.3.2 Other re-inspections of steel products shall comply with the provisions of GB/T247, GB/T210I or G13/T17505. 9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel shall comply with the provisions of GB/T247 and GB/T2101. GB/T 4172—2000
Appendix A
(Suggestive Appendix)
Comparison table of new white grades
The comparison of new and old grades of weathering steel for welding structure is shown in Table A1. Table Al
Q235NH
Q295NH
Q355NH
Q160NH
16CuCr
12MnCutr
15Macucr
15MnCuCr-QT
People's Republic of China
National Standard
Weathering Steel for Welding Structure
GB/T4 172—3000
Published by China Standard Press
No. 16, Erlihebei Street, Fuxingmenwai, Beijing
Postal code: 100045
Tel: 68522112
Printed by China Standard Publishing House, Qinhuangdao Printing Factory, Xinhua Bookstore, Beijing Distribution Office, Sold by Xinhua Bookstores in all regions, exclusive copyright, no reproduction allowed
Print sheet 3/4 Number of words [0 thousand words
Format 880×1230 1/16
Edition in March 2001
First printing in March 2001
Print run 1—3 G00
Book number: 155066·1-17426
Price 8.00 yuan
Keri 562-4951The mechanical properties and process properties of steel shall conform to the provisions of Table 2. Table 2
Q235NH
Q295NH
Q355NH
Q4GCNH
>16-40
240--60
1G~～40
>-40~60
>60～100
216~40
>40~-60
→60~-100
>1 6~40
>40~-60
>60～100
Spot
Not less than
Note: d is the bending diameter a is the steel thickness
360-~490
420--560
490~630
550-~710
Elongation
Not less than
id=2a
d-- 2a
V-type punch-out test
Impact edge
Not less than
GB/T 4172—2000
6.4.2 The impact test result is calculated as the average value of three specimens. It is allowed that the single value of one specimen is lower than the value specified in Table 2, but it shall not be lower than 70% of the specified value.
6.4.3 When a small-size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm is used for impact test, the test result shall not be less than 50% or 75% of the value specified in Table 2. 6.5 Surface quality
6.5.1 The surface of steel shall not have cracks, bubbles, scars, inclusions, or folds. Steel shall not have delamination. If there are the above defects on the surface, it is allowed to be removed, and the depth of elimination shall not exceed half of the steel thickness tolerance. The removed area shall be smooth and without edges and corners, and the surface defects of the steel shall not be removed horizontally. Other defects that do not affect the use are allowed to exist, but the minimum thickness of the steel should be guaranteed. 6.5.2 Steel strips can be delivered with defects, and the defective part shall not exceed 10% of the total length of the steel strip. 7 Test method
7.1 The inspection items, sampling quantity, sampling method and test method of each batch of steel shall comply with the provisions of Table 3. Table 3
Test Item Date
Classification
Sample Quantity
1 (for each furnace tank number)
Sampling Method
GB/T222
GB/T 2975
GB/T2975
GB/T2975
Test Method
GB/T223
GB/T 228
GB/T 232
GB/T 229
7.2 When the steel plate, steel strip and steel section with a thickness of 6~<12mm or the steel bar with a diameter of 12~16mm is subjected to impact test, a small size specimen of 5mm×10mm×55mm or 7.5mm×10mm×55mm shall be used. One rolling surface of the impact specimen may be retained. 8 Inspection rules
8.1 Steel products shall be inspected and accepted by the supplier's technical supervision department. If necessary, the purchaser has the right to conduct inspections in accordance with the provisions of this standard: 8.2 Steel products shall be accepted in batches. Each batch shall consist of steel products of the same furnace number, the same type, the same size, the same rolling system and the same delivery status, and the weight shall not exceed 60t.
8.3 Re-inspection
8.3.1 If the impact test results do not meet the requirements of the Taiwan regulations, 3 more samples shall be taken from the same sheet (roll) or a piece of steel for testing. The average value of the 6 consecutive samples shall not be less than the specified value in Table 3. It is allowed that 2 samples are lower than the specified value, but only 1 sample is allowed to be lower than 70% of the specified value.
8.3.2 Other re-inspections of steel products shall comply with the provisions of GB/T247, GB/T210I or G13/T17505. 9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel shall comply with the provisions of GB/T247 and GB/T2101. GB/T 4172—2000
Appendix A
(Suggestive Appendix)
Comparison table of new white grades
The comparison of new and old grades of weathering steel for welding structure is shown in Table A1. Table Al
Q235NH
Q295NH
Q355NH
Q160NH
16CuCr
12MnCutr
15Macucr
15MnCuCr-QT
People's Republic of China
National Standard
Weathering Steel for Welding Structure
GB/T4 172—3000
Published by China Standard Press
No. 16, Erlihebei Street, Fuxingmenwai, Beijing
Postal code: 100045
Tel: 68522112
Printed by China Standard Publishing House, Qinhuangdao Printing Factory, Xinhua Bookstore, Beijing Distribution Office, Sold by Xinhua Bookstores in all regions, exclusive copyright, no reproduction allowed
Print sheet 3/4 Number of words [0 thousand words
Format 880×1230 1/16
Edition in March 2001
First printing in March 2001
Print run 1—3 G00
Book number: 155066·1-17426
Price 8.00 yuan
Keri 562-4952 Other retests of steel materials shall comply with the provisions of GB/T247, GB/T210I or G13/T17505. 9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel materials shall comply with the provisions of GB/T247 and GB/T2101. GB/T 4172—2000
Appendix A
(Reminder Appendix)
New white grade comparison table
The comparison of new and old grades of steel for welding structures is shown in Table A1. Table Al
Q235NH
Q295NH
Q355NH
Q160NH
16CuCr
12MnCutr
15Macucr
15MnCuCr-QT
People's Republic of China
National Standard
Weathering Steel for Welded Structures
GB/T4 172—3000
Published by China Standard Press
No. 16, Erlihebei Street, Fuxingmenwai, Beijing
Postal code: 100045
Tel: 68522112
Printed by China Standard Publishing House, Qinhuangdao Printing Factory, Xinhua Bookstore, Beijing Distribution Office, Sold by Xinhua Bookstores in all regions, exclusive copyright, no reproduction allowed
Print sheet 3/4 Number of words [0 thousand words
Format 880×1230 1/16
Edition in March 2001
First printing in March 2001
Print run 1—3 G00
Book number: 155066·1-17426
Price 8.00 yuan
Keri 562-4952 Other retests of steel materials shall comply with the provisions of GB/T247, GB/T210I or G13/T17505. 9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel materials shall comply with the provisions of GB/T247 and GB/T2101. GB/T 4172—2000
Appendix A
(Reminder Appendix)
New white grade comparison table
The comparison of new and old grades of steel for welding structures is shown in Table A1. Table Al
Q235NH
Q295NH
Q355NH
Q160NH
16CuCr
12MnCutr
15Macucr
15MnCuCr-QTwww.bzxz.net
People's Republic of China
National Standard
Weathering Steel for Welded Structures
GB/T4 172—3000
Published by China Standard Press
No. 16, Erlihebei Street, Fuxingmenwai, Beijing
Postal code: 100045
Tel: 68522112
Printed by China Standard Publishing House, Qinhuangdao Printing Factory, Xinhua Bookstore, Beijing Distribution Office, Sold by Xinhua Bookstores in all regions, exclusive copyright, no reproduction allowed
Print sheet 3/4 Number of words [0 thousand words
Format 880×1230 1/16
Edition in March 2001
First printing in March 2001
Print run 1—3 G00
Book number: 155066·1-17426
Price 8.00 yuan
Keri 562-495
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