GB/T 36171-2018 English PDF (GB/T36171-2018)

GB/T 36171-2018: High Strength Structural Steel Plate in the Quenched and Tempered Condition with improved Formability
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GB/T 36171-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
High Strength Structural Steel Plate in the Quenched and
Tempered Condition with improved Formability
ISSUED ON. MAY 14, 2018
IMPLEMENTED ON. FEBRUARY 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Grade Designation ... 7
4 Ordering Contents... 7
5 Size, Shape and Weight ... 7
6 Technical Requirements ... 8
7 Test Methods ... 12
8 Inspection Rules ... 12
9 Package, Mark and Quality Certificate ... 13
10 Approximation between Domestic and Foreign Grades ... 13
Appendix A (Informative) Comparison List of Grades among Relevant
Standards ... 14
High Strength Structural Steel Plate in the Quenched and
Tempered Condition with improved Formability
1 Scope
This Standard specifies the grade designation, ordering contents, size, shape, weight,
technical requirements, test methods, inspection rules, package, mark and quality
certificate of the high strength structural steel plate in the quenched and tempered
condition with improved formability.
This Standard is applicable to the no-greater-than-50mm-thick high-strength structural
steel plate with improved formability delivered in modulation (quenching and tempering)
state (hereinafter refer to as steel plate).
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel and Alloy – Determination of Aluminium Content -
Chromazurol S Photometric Method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual
Titration or Potentiometric Titration Method
GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-
Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the
Determination of Vanadium Content
GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy – The
Diantipyrylmethane Photometric Method for the Determination of Titanium Content
GB/T 223.19 Methods for Chemical Analysis of Iron Steel and Alloy - The
Volumetric Method after Combustion in the Pipe Furnace
GB/T 223.76 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrometric Method for the Determination of Vanadium
Content
GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin
Spectrophotometric Method for the Determination of Boron Content
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room
Temperature
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 232 Metallic Materials - Bend Test
GB/T 247 General Rule of Package Mark and Certification for Steel Plates (Sheets)
and Strips
GB/T 709 Dimensions, Shape, Weight and Tolerances for Hot Rolled Steel Sheets
and Strips
GB/T 2975 Steel and Steel Products - Location and Preparation of Samples and
Test Pieces for Mechanical Testing
GB/T 4336 Carbon and Low-Alloy Steel - Determination of Multi-Element Contents
-Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
GB/T 14977 General Requirement for Surface Condition of Hot-Rolled Steel
Plates
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
GB/T 20066 Steel and Iron-Sampling and Preparation of Samples for the
Determination of Chemical Composition
GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content
Infrared Absorption Method after Combustion in an Induction Furnace (Routine
Method)
GB/T 20125 Low-Alloy Steel - Determination of Multi-Element Contents -
Inductively Coupled Plasma Atomic Emission Spectrometric Method
GB/T 20126 Unalloyed Steel - Determination of Low Carbon Content - Part 2.
specified value.
6.4.3 When the thickness of the steel plate is less than 12mm, the Charpy (V-notch)
impact test shall use a small-sized specimen. For the steel plate with thickness >8mm
~ < 12mm, the specimen size shall be 7.5mm × 10mm × 55mm; its test result shall be
no less than 75% of the specified value in Table 2; for the steel plate with thickness
6mm ~ 8mm, the specimen size shall be 5mm × 10mm × 55mm; its test result shall be
no less than 50% of the specified value in Table 2. The steel plate with thickness less
than 6mm shall not perform the impact test.
6.4.4 When the thickness of the steel plate is greater than 30mm, the bend test shall
use the thinning specimen; the size of an auxiliary specimen is to keep a rolling surface
thinning to 30mm; the rolling surface is the outer curved surface during the test. After
the bend test, the outer surface of the specimen shall be free of the visible cracks.
6.4.5 According to the demand of the purchaser, indicated in the contract, the supplier
can perform the hardness test; the test type and specified hardness value shall be
determined through the negotiation between the supplier and the purchaser.
6.5 Surface quality
6.5.1 The surface of the steel plate shall be free of the following defects, like cracks,
air bubbles, scars, folding and inclusion, etc. If the above defects exist, they are
allowed to be removed; the removing depth shall be calculated from the actual size of
the steel plate; it shall be no greater than half of the thickness tolerance of the steel
plate; and the minimum thickness of the steel plate shall be ensured. The removing
position of the defects shall be smooth without edges and corners.
6.5.2 Other defects are allowed to exist; however, their depths shall be calculated from
the actual size of the steel plate; and no greater than half of thickness tolerance; the
defect thickness shall be ensured no greater than the allowable minimum thickness of
the steel plate.
6.5.3 The steel plate shall be free of the visible delamination.
6.5.4 Through the negotiation between the supplier and the purchaser, indicated in the
contract, the steel plate is allowed to weld repair. If the weld repair is performed after
the modulation, then the modulation treatment shall be carried out again after the weld
repair.
6.5.5 Through the negotiation between the supplier and the purchaser, indicated in the
contract, the surface quality can be implemented as specified in GB/T 14977.
6.6 Special requirements
6.6.1 Through the negotiation between the supplier and the purchaser, indicated in the
the same heat treatment system; the weight of per batch of steel plate is no greater
than 60t.
8.3 The sampling quantities and test methods of steel plates shall conform to the
provisions of Table 3.
8.4 The reinspection and judgement rules of steel plate shall conform to the provisions
of GB/T 17505.
8.5 The test results of chemical composition and mechanical property shall be rounded
off as per the rounding off comparison method; the rounding off rules shall conform to
the provisions of GB/T 8170.
9 Package, Mark and Quality Certificate
The package, mark and quality certificate of the steel plate shall conform to the
provisions of GB/T 247.
10 Approximation between Domestic and Foreign
Grades
The comparison list of the grades between this Standard and the relevant standards
can refer to Appendix A.
GB/T 36171-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
High Strength Structural Steel Plate in the Quenched and
Tempered Condition with improved Formability
ISSUED ON. MAY 14, 2018
IMPLEMENTED ON. FEBRUARY 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Grade Designation ... 7
4 Ordering Contents... 7
5 Size, Shape and Weight ... 7
6 Technical Requirements ... 8
7 Test Methods ... 12
8 Inspection Rules ... 12
9 Package, Mark and Quality Certificate ... 13
10 Approximation between Domestic and Foreign Grades ... 13
Appendix A (Informative) Comparison List of Grades among Relevant
Standards ... 14
High Strength Structural Steel Plate in the Quenched and
Tempered Condition with improved Formability
1 Scope
This Standard specifies the grade designation, ordering contents, size, shape, weight,
technical requirements, test methods, inspection rules, package, mark and quality
certificate of the high strength structural steel plate in the quenched and tempered
condition with improved formability.
This Standard is applicable to the no-greater-than-50mm-thick high-strength structural
steel plate with improved formability delivered in modulation (quenching and tempering)
state (hereinafter refer to as steel plate).
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel and Alloy – Determination of Aluminium Content -
Chromazurol S Photometric Method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual
Titration or Potentiometric Titration Method
GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-
Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the
Determination of Vanadium Content
GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy – The
Diantipyrylmethane Photometric Method for the Determination of Titanium Content
GB/T 223.19 Methods for Chemical Analysis of Iron Steel and Alloy - The
Volumetric Method after Combustion in the Pipe Furnace
GB/T 223.76 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrometric Method for the Determination of Vanadium
Content
GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin
Spectrophotometric Method for the Determination of Boron Content
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room
Temperature
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 232 Metallic Materials - Bend Test
GB/T 247 General Rule of Package Mark and Certification for Steel Plates (Sheets)
and Strips
GB/T 709 Dimensions, Shape, Weight and Tolerances for Hot Rolled Steel Sheets
and Strips
GB/T 2975 Steel and Steel Products - Location and Preparation of Samples and
Test Pieces for Mechanical Testing
GB/T 4336 Carbon and Low-Alloy Steel - Determination of Multi-Element Contents
-Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
GB/T 14977 General Requirement for Surface Condition of Hot-Rolled Steel
Plates
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
GB/T 20066 Steel and Iron-Sampling and Preparation of Samples for the
Determination of Chemical Composition
GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content
Infrared Absorption Method after Combustion in an Induction Furnace (Routine
Method)
GB/T 20125 Low-Alloy Steel - Determination of Multi-Element Contents -
Inductively Coupled Plasma Atomic Emission Spectrometric Method
GB/T 20126 Unalloyed Steel - Determination of Low Carbon Content - Part 2.
specified value.
6.4.3 When the thickness of the steel plate is less than 12mm, the Charpy (V-notch)
impact test shall use a small-sized specimen. For the steel plate with thickness >8mm
~ < 12mm, the specimen size shall be 7.5mm × 10mm × 55mm; its test result shall be
no less than 75% of the specified value in Table 2; for the steel plate with thickness
6mm ~ 8mm, the specimen size shall be 5mm × 10mm × 55mm; its test result shall be
no less than 50% of the specified value in Table 2. The steel plate with thickness less
than 6mm shall not perform the impact test.
6.4.4 When the thickness of the steel plate is greater than 30mm, the bend test shall
use the thinning specimen; the size of an auxiliary specimen is to keep a rolling surface
thinning to 30mm; the rolling surface is the outer curved surface during the test. After
the bend test, the outer surface of the specimen shall be free of the visible cracks.
6.4.5 According to the demand of the purchaser, indicated in the contract, the supplier
can perform the hardness test; the test type and specified hardness value shall be
determined through the negotiation between the supplier and the purchaser.
6.5 Surface quality
6.5.1 The surface of the steel plate shall be free of the following defects, like cracks,
air bubbles, scars, folding and inclusion, etc. If the above defects exist, they are
allowed to be removed; the removing depth shall be calculated from the actual size of
the steel plate; it shall be no greater than half of the thickness tolerance of the steel
plate; and the minimum thickness of the steel plate shall be ensured. The removing
position of the defects shall be smooth without edges and corners.
6.5.2 Other defects are allowed to exist; however, their depths shall be calculated from
the actual size of the...