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GB/T 28905-2022 English PDF (GBT28905-2022)

GB/T 28905-2022 English PDF (GBT28905-2022)

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GB/T 28905-2022: Low yield strength steel plate for construction

This document specifies the designation representation method, order content, dimension, shape, weight, technical requirements, test methods, inspection rules, package, mark and certification of low yield strength steel plate for construction. This document is applicable to single-rolled steel plates with a thickness not greater than 120 mm and coiled steel plates with a thickness not greater than 25.4 mm for the manufacture of building anti-seismic, shock-absorbing and other energy-dissipating structural components (such as energy-dissipating damping components, etc.).
GB/T 28905-2022
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.50
CCS H 46
Replacing GB/T 28905-2012
Low yield strength steel plate for construction
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 7
4 Designation representation method ... 8
5 Order content ... 8
6 Dimension, shape, weight ... 8
7 Technical requirements ... 8
8 Test methods ... 11
9 Inspection rules ... 12
10 Package, mark and certification ... 13
Foreword
This document is drafted in accordance with GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".
This document replaces GB/T 28905-2012 "Low yield strength steel plates for construction". Compared with GB/T 28905-2012, in addition to structural adjustment and editorial changes, the main technical changes are as follows:
a) Change the maximum thickness of steel plate to 120 mm; add the coiled steel plate with a thickness not greater than 25.4 mm (see Clause 1; Clause 1 of the 2012 edition);
b) Add LY300 designation and its corresponding technical requirements (see Table 1 and Table 2);
c) Change the chemical composition regulations of C and P; add the regulation that intentionally-added alloy elements shall be indicated in the certification (see Table 1; Table 1 of the 2012 edition);
d) In the delivery state, add the provision that delivery in other states can also be made after negotiation between the supplier and the purchaser (see 7.3; 6.3 of the 2012 edition);
e) Change the yield strength ratio regulations of designations LY160 and LY225 (see Table 2; Table 2 of the 2012 edition);
f) Add the regulations that surface defects of steel plates are allowed to be removed by methods such as grinding AND welding repairs are not allowed (see 7.5.3 and 7.5.4);
g) Change the regulation on the minimum thickness of through-thickness
characteristics (see 7.6.3; 6.6.2 of the 2012 edition);
h) Add special requirements such as bend test, grain size, and nonmetallic inclusions (see 7.6.2 and 7.6.5);
i) Change inspection lot regulations (see 9.2; 7.2 of the 2012 edition); j) Add provisions on type of inspection document (see Clause 10).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by China Iron and Steel Association.
This document shall be under the jurisdiction of National Technical Committee 183 on Steel of Standardization Administration of China (SAC/TC 183).
Drafting organizations of this document: Baoshan Iron and Steel Co., Ltd., China Metallurgical Information and Standardization Institute, Hunan Valin Xiangtan Iron and Steel Co., Ltd., Hunan Valin LY Steel Co., Ltd., Hebei Puyang Iron and Steel Co., Ltd., Shanxi Jianlong Industrial Co., Ltd., Nanjing Iron and Steel Co., Ltd., SGIS Songshan Co., Ltd.
Main drafters of this document: Huang Jinhua, Wen Donghui, Tu Shulin, Zhang Weixu, Li Qian, Yang Jianhua, Wang Jing, Fu Zhongyuan, Wang Yanwen, Chen Linheng, Zhong Shoujun, Yang Yuan, Shi Qing, Sun Menghan, Xiong Xiangjiang, Liang Liang, Guo Xiao, Jia Sixian, Wang Jun, Huang Yuanjian, Yuan Min, Hu Ling, Xu Qing. This document was first issued in 2012. This is the first revision.
Low yield strength steel plate for construction
1 Scope
This document specifies the designation representation method, order content, dimension, shape, weight, technical requirements, test methods, inspection rules, package, mark and certification of low yield strength steel plate for construction. This document is applicable to single-rolled steel plates with a thickness not greater than 120 mm and coiled steel plates with a thickness not greater than 25.4 mm for the manufacture of building anti-seismic, shock-absorbing and other energy-dissipating structural components (such as energy-dissipating damping components, etc.). 2 Normative references
The contents of the following documents, through normative references in this text, constitute indispensable provisions of this document. Among them, for dated references, only the edition corresponding to that date applies to this document. For undated references, the latest edition (including all amendments) applies 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 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.37 Iron, steel and alloy - Determination of nitrogen content - Indophenol blue spectrophotometric method after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
GB/T 223.53 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content
GB/T 223.54 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of nickel content
GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content
GB/T 223.64 Iron, steel and alloy - Determination of manganese content - Flame atomic absorption spectrometric method
GB/T 223.76 Methods for chemical analysis 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 223.84 Steel and iron - Determination of titanium content -
Diantipyrylmethane spectrophotometric method
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
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 Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet
GB/T 2970 Method for ultrasonic testing of thicker steel plates
GB/T 2975 Steel and Steel Products - Location and Preparation of 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 5313 Steel plate with through-thickness characteristics
GB/T 6394 Metal - Methods for Estimating the Average Grain Size
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and Judgement of Limiting Values
GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams
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 18253-2018 Steel and steel products - Types of inspection documents 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 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas
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: Infrared absorption method after combustion in an in an induction furnace (With preheating) 3 Terms and definitions
This document does not have terms and definitions that need to be defined. 4 Designation representation method
The designation of steel consists of two parts: The first initials "LY" of "Low Yield" and the target value of the specified yield strength.
Example: LY160
LY - The first initials of "Low Yield";
160 - The target value of the specified yield strength, in megapascals (MPa). 5 Order content
The contract or order for ordering according to this document shall include the following content:
a) Product name;
b) The number of this document;
c) Designation;
d) Specification and dimension, roughness accuracy;
e) Delivery state;
f) Weight;
g) Other requirements.
6 Dimension, shape, weight
The dimension, shape, weight and tolerance of the steel plate shall comply with the provisions of GB/T 709.
7 Technical requirements
7.1 Designation and chemical composition
7.1.1 The designation and chemical composition (melting analysis) of steel shall comply with the requirements in Table 1.
Table 1 -- Designation and chemical composition of steel
7.1.2 The content of residual elements copper, chromium and nickel in the steel shall not exceed 0.30%, respectively. The supplier may not make analysis if it can guarantee it.
7.1.3 The permissible tolerances for chemical composition of steel plate products shall comply with the provisions of GB/T 222.
7.2 Smelting method
Steel is produced from killed steel smelted in oxygen converters or electric arc furnaces. Unless the purchaser has special requirements and is specified in the contract, the smelting method shall be chosen by the supplier.
7.3 Delivery state
Steel plates are usually delivered in hot-rolled, controlled-rolled, or heat-treated state. If required by the purchaser, after negotiation between the supplier and the purchaser, and indicated in the contract, delivery in other states can also be made. 7.4 Mechanical properties
7.4.1 The mechanical properties of the steel plate shall meet the requirements in Table 2.
7.4.2 The steel plate with a nominal thickness not less than 6 mm shall be subjected to impact test. The size of the impact specimen shall be a standard specimen of 10 mm??10 mm??55 mm. When the thickness of steel plate is not enough to make standard specimen, it shall use small-size specimens of 7.5 mm??10 mm??55 mm and 5 mm??10 mm??55 mm. The impact absorption energy shall not be less than 75% or 50% of the value specified in Table 2, respectively. The larger-size specimen is preferred.
7.4.3 The impact absorption energy of steel plate is calculated according to the arithmetic mean of a group of 3 specimens. It is allowed that the single value of 1 specimen is lower than the specified value in Table 2; but not lower than 70% of the specified value. Otherwise, 3 specimens shall be taken from the same steel plate or the same billet for testing. The arithmetic mean of the impact absorption energy of the 6 Designation Chemical composition (mass fraction)
a/%
a Selected by the supplier, other alloy elements such as Nb, V, Ti, B can be added as required. Their contents shall be indicated in the certification. specimens in the two groups shall not be lower than the specified value. It is allowed that 2 specimens have a single value lower than the specified value; but only one of them is allowed to have a single value lower than 70% of the specified value. Table 2 -- Mechanical properties
Table 2 -- Mechanical properties (continued)
Designation
Tensile testa, b Charpy (V-notch) impact teste, f
Lower yield
strengthc, d
ReL/MPa
Tensile
strengthd
Rm/MPa
Percentage
elongation
after fracture
A50 mm/%
Yield
strength
ratio
Test
temperature
Impact
absorption
energy
KV2/J
a Tensile test specimen is transverse.
b Tensile specimen size: For thickness not greater than 50 mm, use L0=50 mm, b=25 mm; for thickness greater than 50 mm, use L0=50 mm, d=14 mm. For thickness >25 mm~50 mm, L0=50 mm and d=14 mm can also be used; but in the case of arbitration, L0=50 mm, b=25 mm. c When the yield phenomenon is not obvious, the specified plastic elongation strength Rp0.2 shall be used instead of the lower yield strength.
d If required by the purchaser, after negotiation between the supplier and the purchaser, and indicated in the contract, the range of yield strength and tensile strength can be adjusted appropriately. e Impact test specimen is longitudinal.
f If required by the purchaser, after negotiation between the supplier and the purchaser, and indicated in the contract, other values of impact test temperature and impact absorption energy may be specified.
7.5 Surface condition
7.5.1 There shall be no harmful defects such as air bubbles, scars, cracks, folds, inclusions and pressed iron oxide scales on the surface of steel plate that will affect the use. Steel plates shall not have visible delamination.
7.5.2 The surface of steel plate is allowed to have a thin layer of iron oxide scale and rust without hindering the inspection of surface defects; and inconspicuous roughness, reticulation, pitting, scratches, and other local defects caused by pressing the iron oxide scale and rolls. However, its depth shall not be greater than half of the tolerance of the thickness of steel plate; the minimum allowable thickness of steel plate shall be Designation Tensile strengthd
Tensile testa, b
Lower yield strengthc, d Percentage elongation
after fracture
Yield strength
ratio
Charpy (V-notch) impact teste, f
Test temperature Impact absorption energy
guaranteed.
7.5.3 Surface defects of steel plates are allowed to be removed by methods such as grinding. The cleaned place shall be smooth without edges and corners. The cleaning depth shall not be greater than half of the tolerance of the steel plate thickness. The minimum allowable thickness of steel plate shall be guaranteed.
7.5.4 Welding repairs are not allowed for steel plates.
7.5.5 After negotiation between the supplier and the purchaser, and indicated in the contract, the surface condition of steel plate can also comply with the provisions of GB/T 14977.
7.6 Special requirements
7.6.1 According to the requirements of the purchaser, after negotiation between the supplier and the purchaser, and indicated in the contract, the requirements of 7.6.2~7.6.5 can be supplemented.
7.6.2 The bend test requires that the diameter of the bend indenter, D=a, where a is the thickness of the specimen.
7.6.3 For the steel plate with a thickness not less than 15 mm, it shall carry out the through-thickness characteristics test. The steel plates with different through-thickness characteristics levels shall comply with the provisions of GB/T 5313.
7.6.4 Steel plates shall be subjected to ultrasonic testing one by one. The ultrasonic testing method shall be in accordance with GB/T 2970 or other methods. The testing standards and conformity levels shall be specified in the contract.
7.6.5 Inspection requirements for grain size and nonmetallic inclusions. 8 Test methods
8.1 The test methods for steel plate inspection items shall comply with the provisions in Table 3.
8.2 The chemical composition test of steel is generally carried out according to GB/T 4336, GB/T 20123, GB/T 20124, GB/T 20125, GB/T 20126, or other general methods. During arbitration, it shall be in accordance with the provisions of GB/T 223.5, GB/T 223.12, GB/T 223.23, GB/T 223.26, GB/T 223.37, GB/T 223.40, GB/T 223.53, GB/T 223.54, GB/T 223.59, GB/T 223.60, GB/T 223.63, GB/T 223.64, GB/T 223.76, GB/T 223.78, GB/T 223.84, GB/T 223.85, and GB/T 223.86.
Table 3 -- Inspection items, number of specimens, sampling methods, and test methods
No. Inspection items Number of specimens/pieces Sampling methods Test methods 1 Chemical analysis 1/furnace GB/T 20066 8.2
2 Tensile test 1/lot GB/T 2975, transverse GB/T 228.1
3 Impact test 3/lot GB/T 2975, longitudinal GB/T 229
4 Bend testa 1/lot GB/T 2975, transverse GB/T 232
5 Through-thickness tensile characteristics testa 3/lot GB/T 5313 GB/T 228.1 6 Ultrasonic inspectiona One by one - GB/T 2970 or other inspection methods 7 Grain sizea Negotiated Negotiated GB/T 6394
8 Nonmetallic inclusionsa Negotiated Negotiated GB/T 10561
9 Dimension and shape One by one - Suitable measuring tool
10 Surface condition One by one - Visually
a Additional inspection items that are negotiated by both the supplier and the purchaser and indicated in the contract according to the requirements of the purchaser.
9 Inspection rules
9.1 The inspection and acceptance of steel plates shall be carried out by the quality inspection department of the supplier.
9.2 Steel plates shall be accepted in lots. Each lot shall be composed of successively rolled steel plates of the same designation, same heat number, same thickness, and same delivery state.
9.3 The number of specimens and sampling method of steel plate shall comply with the provisions in Table 3.
9.4 The re-inspection and determination of steel plates shall comply with the provisions of GB/T 17505.
9.5 The test results of chemical composition and mechanical properties are rounded according to the rounding value comparison method. The rules of rounding off shall be in accordance with the provisions of GB/T 8170.
10 Package, mark and certification
10.1 The package, mark and certification of the steel plate shall comply with the provisions of GB/T 247.
10.2 The type of certification of the steel plate shall comply with the provisions in GB/T 18253-2018. When the certification type is not specified, it shall be in accordance with GB/T 18253-2018, type 3.1.
__________ END __________

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