GB/T 1591-2018 English PDF (GBT1591-2018)

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GB/T 1591-2018: High strength low alloy structural steels
GB/T 1591-2018
High strength low alloy structural steels
ICS 77.140.01
H40
National Standards of People's Republic of China
Replace GB/T 1591-2008
Low alloy high strength structural steel
Published on.2018-05-14
Implementation of.2019-02-01
State Market Supervisory Administration
China National Standardization Administration issued
Content
Foreword I
1 range 1
2 Normative references 1
3 Terms and Definitions 2
4 brand representation method 3
5 Ordering content 3
6 size, shape, weight 3
7 Technical requirements 4
8 Test method 16
9 Inspection rules 16
10 Packaging, Marking and Quality Certificate 17
Appendix A (informative appendix) Domestic and foreign standard brand comparison table 18
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 1591-2008 "low alloy high strength structural steel". Compared with GB/T 1591-2008, except for editorial modifications
The main technical changes are as follows.
--- It is clear that the chemical composition of this standard is also applicable to steel billets (see Chapter 1, Chapter 1 of the.2008 edition);
--- Revised the definitions of the terms "thermo-mechanical rolling" and "normalizing rolling" and added the terms and definitions of "hot rolling" and "normalizing" (see Chapter 3,
Chapter 3 of the.2008 edition);
---Modified the brand representation method (see Chapter 4, Chapter 4 of the.2008 edition);
--- Added ordering content (see Chapter 5);
--- Clear size, shape, weight and tolerance requirements (see Chapter 6, Chapter 5,.2008);
--- Replace Q345 steel grade with Q355 steel grade and related requirements (see Chapter 7, 9.2,.2008 edition, Chapter 6, 8.2);
---Specify the chemical composition of each grade according to different delivery conditions, and modify the content of refined grain elements (see 7.1,.2008 edition 6.1);
--- According to different delivery conditions, the mechanical properties of each grade are specified, and the lower yield strength is modified to the upper yield strength, and the index is correspondingly improved.
10MPa~15MPa (see 7.4.1, 7.4.2,.2008 version 6.4.1, 6.4.2);
--- Refined steel surface quality requirements (see 7.5,.2008 version 6.5);
--- Revised the test method and inspection rules, and clarified the sampling site of the impact test (see Chapter 8, Chapter 9, Chapter 7, Chapter 7,
Chapter 8);
--- Added a comparison table between this standard and foreign standard brands (see Appendix A).
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Angang Co., Ltd., Metallurgical Industry Information Standards Institute, Shougang Corporation, Hegang Co., Ltd.
Tangshan Branch, Xiwang Special Steel Co., Ltd., Shandong Iron and Steel Co., Ltd. Laiwu Branch, Yingkou Zhongshi Steel New Material Co., Ltd., Zhongzhong
Letter Metal Co., Ltd.
The main drafters of this standard. Liu Xuyuan, Pu Zhimin, Yan Yan, Dai Qiang, Shi Li, Shen Qinyi, Deng Cuiqing, Zhang Lingtong, Zhao Xinhua, Li Wenwu,
Wang Houzhen, Zhang Chenglian, Gao Yan.
The previous versions of the standards replaced by this standard are.
---GB 1591-1979, GB 1591-1988, GB/T 1591-1994, GB/T 1591-2008.
Low alloy high strength structural steel
1 Scope
This standard specifies the grade indication method, ordering content, size, shape, weight, technical requirements and test method of low alloy high strength structural steel.
Law, inspection rules, packaging, signs and quality certificates.
This standard is applicable to low-alloy high-strength structural steel steel plates, steel strips, steel bars, steel bars, etc. for general structural and engineering purposes. Its chemical composition is also suitable
Used for billets.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
Permissible deviation of chemical composition of finished products of GB/T 222 steel
GB/T 223.3 Methods for chemical analysis of steels and alloys - Determination of phosphorus content by diantipyrine methane phosphomolybdic acid gravimetric method
GB/T 223.9 Determination of aluminium content of steels and alloys - chrome azure S spectrophotometric method
GB/T 223.11 Determination of chromium content in steels and alloys - either titration or potentiometric titration
GB/T 223.14 Methods for chemical analysis of steels and alloys - Determination of vanadium content by extraction spectrophotometric method
GB/T 223.17 Methods for chemical analysis of steels and alloys - Determination of titanium content by diantipyrylmethane photometric method
GB/T 223.18 Methods for chemical analysis of steels and alloys - Separation of sodium thiosulfate - Iodometric method
GB/T 223.23 Determination of nickel content in steel and alloys - Determination of succinimide spectrophotometric method
GB/T 223.26 Determination of molybdenum content of steels and alloys - thiocyanate spectrophotometric method
GB/T 223.37 Methods for chemical analysis of steels and alloys - Distillation separation - Determination of nitrogen content
GB/T 223.40 Determination of bismuth content of steels and alloys
GB/T 223.60 Steel and alloys - Determination of silicon content by perchloric acid dehydration gravimetric method
GB/T 223.63 Determination of manganese content by sodium periodate (potassium) photometric method
GB/T 223.68 Steel and alloy chemical analysis method - Determination of sulfur content by potassium iodate titration after combustion in tubular furnace
GB/T 223.69 Determination of carbon content of steels and alloys
GB/T 223.76 Determination of vanadium content by flame atomic absorption spectrometry
GB/T 223.78 Determination of boron content by direct photometric method with curcumin
GB/T 223.79 Determination of multi-element content of iron and steel by X-ray fluorescence spectrometry (conventional method)
GB/T 223.84 Determination of titanium content in steels and alloys - Diantipymethylene methane spectrophotometric method
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 229 metal material Charpy pendulum impact test method
GB/T 232 metal material bending test method
General provisions of GB/T 247 steel and steel strip packaging, marking and quality certificates
GB/T 702 hot rolled steel bar size, shape, weight and tolerance
GB/T 706 hot rolled steel
GB/T 709 hot rolled steel sheet and strip size, shape, weight and tolerance
General provisions for GB/T 2101 steel acceptance, packaging, marking and quality certificates
GB/T 2975-2018 Steel and steel products, mechanical properties test sampling position and sample preparation
GB/T 4336 Determination of multi-element content of carbon steel and medium-low alloy steels by spark discharge atomic emission spectrometry (conventional method)
GB/T 5313 thickness direction performance steel plate
GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values
GB/T 11263 hot rolled H-beam and split T-beam
GB/T 14977 General requirements for surface quality of hot rolled steel sheets
General technical requirements for the delivery of GB/T 17505 steel and steel products
GB/T 20066 Sampling and sample preparation method for samples for determination of chemical composition of steel and iron
GB/T 20123 Determination of total carbon and sulfur content of steels - Infrared absorption method after high-frequency induction furnace combustion (conventional method)
GB/T 20124 Determination of nitrogen content of steels - Insulating gas fusion heat conduction method (conventional method)
GB/T 20125 Determination of multi-element content of low alloy steels by inductively coupled plasma atomic emission spectrometry
GB/T 28300 hot rolled bar and wire rod surface quality grade delivery technical conditions
YB/T 4427 General requirements for surface quality of hot rolled steel
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Hot rolled as-roled; AR or WAR
The steel is not subjected to any special rolling and/or heat treatment.
3.2
Normalized
The steel is heated to a suitable temperature above the temperature of the phase transition point and then cooled in air to a temperature below the temperature of a phase change point
Processing process.
3.3
Normalizing rolling
The final deformation is carried out during the rolling process in a certain temperature range, so that the steel reaches a state after normalizing, so that even after normalizing
A rolling process that also achieves the specified mechanical properties.
Note. For normalized rolling, it is also referred to as "controlled rolling" in some publications.
3.4
Thermomechanical rolling thermomechanicalprocessed
The final deformation of the steel is carried out in a certain temperature range, thus ensuring that the steel is not obtained only by heat treatment.
performance.
Note 1. Thermoforming or steel post-weld heat treatment at temperatures above 580 °C may not be suitable. Flame straightening according to relevant technical specifications
Is allowed to apply.
Note 2. Thermomechanical rolling may include a process of increasing the cooling rate in a tempered or non-tempered condition, including tempering but not including direct quenching and quenching.
Tempering.
Note 3. Also known as TMCP (thermo-mechanical control process), also referred to as "controlled rolling" in some publications.
4 brand representation
4.1 The grade of the steel is represented by the initial Pinyin of the Pinyin of the yield strength "Qu", the specified minimum upper yield strength value, and the delivery status.
Number, quality grade symbol (B, C, D, E, F) is composed of four parts.
Note 1. When the delivery status is hot rolling, the delivery status code AR or WAR can be omitted; when the delivery status is normalized or normalized rolling, the delivery status code is
Expressed by N.
Note 2. The minimum upper yield strength value of the delivery status code specified by Q, referred to as “steel grade”.
Example. Q355ND. among them.
Q --- the first letter of the Chinese word for the yield strength of the steel;
355---specified minimum upper yield strength value in MPa (MPa);
N --- delivery status is normal or normalized rolling;
D --- Quality level is D level.
4.2 When the purchaser requires the steel plate to have thickness-direction performance, add the representative thickness direction (Z-direction) performance level after the above-mentioned specified grade.
Symbols such as. Q355NDZ25.
5 Ordering content
5.1 Contracts or orders ordered under this standard shall include the following.
a) the standard number;
b) product type;
c) steel grade (steel grade quality grade);
d) size, shape and tolerance (see Chapter 6);
e) the weight (or quantity) of the delivery;
f) Selection of all requirements (see 5.2).
5.2 After consultation between the supplier and the buyer, and indicate in the contract, the following contents can be selected as the ordering content of this standard. If the buyer is asking
If the order is not specified at the time of ordering, the product is supplied in accordance with 5.1.
a) carbon equivalent or weld crack sensitivity index (Pcm) (see 7.1.3, Table 6);
b) adding alloying elements and their contents (see 7.1.6, Table 1, Table 3, Table 5);
c) the lower chemical composition of the commodity billet (see 7.1.8);
d) analysis of finished products (see 7.1.9);
e) smelting methods (see 7.2);
f) impact test temperature and impact test sampling direction (see Table 11);
g) bending test (see 7.4.3);
h) properties of the steel in the thickness direction (see 7.1.7, 7.4.1.4 and 9.2.3);
i) surface quality (see 7.5.1.5, 7.5.2.4, 7.5.3.2, 7.5.4.2);
j) non-destructive testing (see 7.6);
k) Sampling position of the impact specimen (see 8.3).
6 size, shape, weight
6.1 The dimensions, shape, weight and tolerance of hot-rolled steel bars shall comply with the provisions of GB/T 702, and the specific groups shall be indicated in the contract.
6.2 The dimensions, shape, weight and tolerance of hot-rolled steel shall comply with the provisions of GB/T 706, and the specific group shall be specified in the contract.
6.3 The dimensions, shape, weight and allowable deviation of hot-rolled steel sheets and strips shall comply with the provisions of GB/T 709, and the specific accuracy category shall be in the contract.
Note.
6.4 The dimensions, shape, weight and tolerance of hot-rolled H-section steel and split T-section steel shall comply with the provisions of GB/T 11263.
6.5 Steels of other sizes, shapes and tolerances may be supplied upon agreement between the supplier and the purchaser.
7 Technical requirements
7.1 Steel grades and chemical composition
7.1.1 The grade and chemical composition of the hot rolled steel (melting analysis) shall comply with the requirements of Table 1, and the carbon equivalent value shall comply with the requirements of Table 2.
7.1.2 The grade and chemical composition of the normalized and normalized rolled steel (melting analysis) shall comply with the requirements of Table 3, and the carbon equivalent value shall comply with Table 4.
Provisions.
7.1.3 The grade and chemical composition of the hot mechanically rolled steel (melting analysis) shall comply with the requirements of Table 5, and the carbon equivalent value shall comply with the provisions of Table 6.
When the carbon content of the thermomechanically rolled steel is not more than 0.12%, it is preferable to use the welding crack sensitivity index (Pcm) instead of the carbon equivalent to evaluate the steel.
Solderability, Pcm value should meet the requirements of Table 6. After consultation between the supplier and the buyer, the carbon equivalent or weld crack sensitivity index can be specified.
The weldability of steel, when not specified, the supplier can choose one.
7.1.4 Carbon equivalent (CEV) is calculated from the smelting analysis componen...