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GB/T 33959-2017Stainless steel bars for the reinforcement of concrete (English PDF)

钢筋混凝土用不锈钢钢筋

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Issued by

AQSIQ; SAC

Level / Type

National · Recommended

Issue date

July 12, 2017

Implementation date

April 1, 2018

Scope

GB/T 33959-2017 is the English-translated version of 钢筋混凝土用不锈钢钢筋.

GB/T 33959-2017 specifies the terms and definitions, ordering information, classification, grades, dimensions, shape, weight and permitted deviations, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of stainless steel bars for the reinforcement of concrete.

It applies to hot-rolled plain bars (grade HPB300S, 6 mm to 22 mm) and ribbed bars (grades HRB400S and HRB500S, 6 mm to 50 mm) used in reinforced concrete for building, transport, railway and port works.

The bars are made from nine stainless steels - austenitic (06Cr19Ni10, 022Cr19Ni10N, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2N), austenitic-ferritic duplex (022Cr22Ni5Mo3N, 022Cr23Ni4MoCuN, 022Cr25Ni6Mo2N, 022Cr25Ni7Mo4N) and ferritic (022Cr12) - with heat-analysis limits and a table of nominal cross-sectional areas and theoretical weights per metre for each steel.

Surface shape, dimensional tolerances, length and weight deviations follow GB 1499.1 and GB 1499.2, with added limits on straightness and coil weight; the test methods draw on the Chinese steel analysis, tensile, bend, impact, intergranular corrosion and chloride corrosion standards.

It is a first edition, issued on 12 July 2017 and in force since 1 April 2018. Classification: ICS 77.140.60, CCS H44. The document runs to 19 pages, delivered complete in English translation.

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Document preview — GB/T 33959-2017

National Standard of the People's Republic of China

ICS: 77.140.60
Classification: H44

Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC

ForewordI
1 Scope1
2 Normative references1
3 Terms and definitions2
4 Ordering information2
5 Classification and grades2
6 Dimensions, shape, weight and permitted deviations2
6.1 Range of nominal diameters2
6.2 Nominal cross-sectional area and theoretical weight2
6.3 Surface shape and dimensional tolerances4
6.4 Length and permitted deviation4
6.4.1 Length4
6.4.2 Permitted deviation of length4
6.5 Straightness and ends4
6.6 Weight and permitted deviation4
7 Technical requirements4
7.1 Steel grades and chemical composition4

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This standard was proposed by the China Iron and Steel Association.

This standard is under the jurisdiction of the National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183).

Drafting organisations of this standard: Central Research Institute of Building and Construction Co., Ltd. of MCC Group, Shanxi Taigang Stainless Steel Co., Ltd., Guangxi Shenglong Metallurgical Co., Ltd., Shougang Group, China Metallurgical Information and Standardization Institute, Wuzhou Yongda Iron and Steel Co., Ltd., Zhejiang Fugang Metal Products Co., Ltd., Pangang Group Jiangyou Changcheng Special Steel Co., Ltd., Xingtai Iron and Steel Co., Ltd., and Foshan Putie Stainless Steel Co., Ltd.

Principal drafters of this standard: Zhu Jianguo, Wang Huimian, Li Xiaobin, Ke Xueli, Di Quankang, Wang Yujie, Li Yukun, Qian Yihao, Zhou Maohua, Bai Liguo, Wang Shuo, Zhang Jiansheng, Wang Changcheng, Liu Baoshi, Gong Cui, Liu Yongji, Pan Yijie, Yang Yaguang, An Jingtao, Chen Jie, Guo Wenquan.

1 Scope

This standard specifies the terms and definitions, ordering information, classification, grades, dimensions, shape, weight and permitted deviations, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of stainless steel bars for the reinforcement of concrete.

This standard applies to hot-rolled plain and ribbed stainless steel bars (hereinafter referred to as bars) for reinforced concrete in building, transport, railway, port and similar works.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 222 Permissible tolerances for chemical composition of steel products

GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content

GB/T 223.4 Iron, steel and alloy - Determination of manganese content - Potentiometric or visual titration method

GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method

GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method

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 223.23 Iron, steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method

GB/T 223.25 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime gravimetric method for the determination of nickel content

GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method

GB/T 223.28 Methods for chemical analysis of iron, steel and alloy - The alpha-benzoin oxime gravimetric method for the determination of molybdenum content

GB/T 223.36 Methods for chemical analysis of iron, steel and alloy - Distillation separation-neutralization titration method for the determination of nitrogen content

GB/T 223.37 Methods for chemical analysis of iron, steel and alloy - The indophenol blue photometric method for the determination of nitrogen content after distillation separation

GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese 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 223.67 Iron, steel and alloy - Determination of sulfur content - Methylene blue spectrophotometric method

GB/T 223.71 Methods for chemical analysis of iron, steel and alloy - The gravimetric method after combustion in the pipe furnace for the determination of carbon content

GB/T 223.72 Iron, steel and alloy - Determination of sulfur content - Gravimetric 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 232 Metallic materials - Bend test

GB/T 229 Metallic materials - Charpy pendulum impact test method

GB 1499.1 Steel for the reinforcement of concrete - Part 1: Hot rolled plain bars

GB 1499.2 Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars

GB/T 2101 General requirements of acceptance, packing, marking and certification for section steel

GB/T 4334-2008 Corrosion of metals and alloys - Test methods for intergranular corrosion of stainless steels

GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)

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 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas (routine method)

GB/T 20878 Stainless and heat-resisting steels - Designation and chemical composition

GB/T 28900 Test methods of steel for reinforcement of concrete

YB/T 081 Rules for rounding off of numerical values and judgement of testing values for technical standards of metallurgy

YB/T 4369 Test method for chloride ion corrosion resistance of steel bars in concrete

JGJ 107 Technical specification for mechanical splicing of steel reinforcing bars

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB 1499.1, GB 1499.2 and GB/T 20878 and the following apply.

3.1 Stainless steel bars

Steel bars whose principal characteristics are resistance to rusting and corrosion.

4 Ordering information

Contracts or orders placed in accordance with this standard shall include the following:

a) the number of this standard;

b) the product name;

c) the bar grade and the unified numerical designation of the steel;

d) the nominal diameter, length and weight (or quantity, or coil weight) of the bars;

e) the delivery condition;

f) any special requirements.

5 Classification and grades

5.1

Bars are classified by characteristic yield strength into grades 300, 400 and 500.

5.2

The composition and meaning of the bar designations are given in Table 1.

Table 1 - Composition and meaning of bar designations:

Hot-rolled plain stainless steel bars: designation HPB300S, composed of HPB + characteristic yield strength + S; HPBS is the abbreviation of Hot rolled Plain Bars of Stainless steel.

Hot-rolled ribbed stainless steel bars: designations HRB400S and HRB500S, composed of HRB + characteristic yield strength + S; HRBS is the abbreviation of Hot rolled Ribbed Bars of Stainless steel.

6 Dimensions, shape, weight and permitted deviations

6.1 Range of nominal diameters

The nominal diameter of plain stainless steel bars ranges from 6 mm to 22 mm; the nominal diameter of ribbed stainless steel bars ranges from 6 mm to 50 mm.

6.2 Nominal cross-sectional area and theoretical weight

The nominal cross-sectional area and theoretical weight of the bars are given in Table 2.

Table 2 - Nominal cross-sectional area and theoretical weight of bars. Theoretical weight in kg/m for the steels (GB/T 20878 serial No., unified numerical designation, steel grade, density in g/cm3 at 20 °C): austenitic - No. 17 S30408 06Cr19Ni10 (7.93); No. 25 S30453 022Cr19Ni10N (7.93); No. 38 S31608 06Cr17Ni12Mo2 (8.00); No. 44 S31653 022Cr17Ni12Mo2N (8.04); austenitic-ferritic - No. 70 S22253 022Cr22Ni5Mo3N, No. 72 S23043 022Cr23Ni4MoCuN, No. 73 S22553 022Cr25Ni6Mo2N, No. 76 S25073 022Cr25Ni7Mo4N (all 7.80); ferritic - No. 83 S11203 022Cr12 (7.75). Values below are given as: nominal diameter, mm / nominal cross-sectional area, mm2 / weight for 06Cr19Ni10 and 022Cr19Ni10N / 06Cr17Ni12Mo2 / 022Cr17Ni12Mo2N / the four austenitic-ferritic steels / 022Cr12.

6 / 28.27 / 0.224 / 0.226 / 0.227 / 0.221 / 0.219

8 / 50.27 / 0.399 / 0.402 / 0.404 / 0.392 / 0.390

10 / 78.54 / 0.623 / 0.628 / 0.631 / 0.613 / 0.609

12 / 113.1 / 0.897 / 0.905 / 0.909 / 0.882 / 0.877

14 / 153.9 / 1.220 / 1.231 / 1.237 / 1.200 / 1.193

16 / 201.1 / 1.595 / 1.609 / 1.617 / 1.569 / 1.559

18 / 254.5 / 2.018 / 2.036 / 2.046 / 1.985 / 1.972

20 / 314.2 / 2.492 / 2.514 / 2.526 / 2.451 / 2.435

22 / 380.1 / 3.014 / 3.041 / 3.056 / 2.965 / 2.946

25 / 490.9 / 3.893 / 3.927 / 3.947 / 3.829 / 3.804

28 / 615.8 / 4.883 / 4.926 / 4.951 / 4.803 / 4.772

32 / 804.2 / 6.377 / 6.434 / 6.466 / 6.273 / 6.233

36 / 1 018 / 8.073 / 8.144 / 8.185 / 7.940 / 7.890

40 / 1 257 / 9.968 / 10.056 / 10.106 / 9.805 / 9.742

50 / 1 964 / 15.575 / 15.712 / 15.791 / 15.319 / 15.221

6.3 Surface shape and dimensional tolerances

The surface shape and dimensional tolerances of plain bars and ribbed bars shall comply with GB 1499.1 and GB 1499.2 respectively.

6.4 Length and permitted deviation

6.4.1 Length

The length of plain bars shall comply with GB 1499.1, and the length of ribbed bars shall comply with GB 1499.2.

6.4.2 Permitted deviation of length

When bars are delivered in fixed lengths, the permitted deviation of length is +50/0 mm.

6.5 Straightness and ends

6.5.1

The curvature of straight bars shall not impair normal use: the curvature per metre shall not exceed 4 mm and the total curvature shall not exceed 0.4 % of the total length of the bar.

6.5.2

The ends of the bars shall be cut square, and any local deformation shall not impair use.

6.6 Weight and permitted deviation

6.6.1

Bars are delivered by actual weight, or may be delivered by theoretical weight. When delivered by theoretical weight, the theoretical weight is the length of the bars multiplied by the theoretical weight per metre given in Table 2.

6.6.2

The permitted deviation between the actual weight and the theoretical weight of plain bars and ribbed bars shall comply with GB 1499.1 and GB 1499.2 respectively.

6.6.3

For bars delivered in coils, each coil shall consist of one continuous length, and the weight of each coil shall be not less than 800 kg.

7 Technical requirements

7.1 Steel grades and chemical composition

7.1.1

The steel grades and chemical composition (heat analysis) of the bars shall comply with Table 3. By agreement between supplier and purchaser, stated in the contract, bars of steel grades or chemical compositions other than those in Table 3 may be supplied.

Table 3 - Steel grades and chemical composition (heat analysis) of bars, mass fraction %, given as C, Si, Mn, P, S, Ni, Cr, Mo, Cu, N (other elements: none specified):

Austenitic, No. 1 (GB/T 20878 No. 17, S30408) 06Cr19Ni10: C 0.08; Si 1.00; Mn 2.00; P 0.045; S 0.030; Ni 8.00 to 11.00; Cr 18.00 to 20.00

Austenitic, No. 2 (No. 25, S30453) 022Cr19Ni10N: C 0.030; Si 1.00; Mn 2.00; P 0.045; S 0.030; Ni 8.00 to 11.00; Cr 18.00 to 20.00; N 0.10 to 0.16

Austenitic, No. 3 (No. 38, S31608) 06Cr17Ni12Mo2: C 0.08; Si 1.00; Mn 2.00; P 0.045; S 0.030; Ni 10.00 to 14.00; Cr 16.00 to 18.00; Mo 2.00 to 3.00

Austenitic, No. 4 (No. 44, S31653) 022Cr17Ni12Mo2N: C 0.030; Si 1.00; Mn 2.00; P 0.045; S 0.030; Ni 10.00 to 13.00; Cr 16.00 to 18.00; Mo 2.00 to 3.00; N 0.10 to 0.16

Austenitic-ferritic, No. 5 (No. 70, S22253) 022Cr22Ni5Mo3N: C 0.030; Si 1.00; Mn 2.00; P 0.030; S 0.020; Ni 4.50 to 6.50; Cr 21.00 to 23.00; Mo 2.50 to 3.50; N 0.08 to 0.20

Austenitic-ferritic, No. 6 (No. 72, S23043) 022Cr23Ni4MoCuN: C 0.030; Si 1.00; Mn 2.50; P 0.035; S 0.030; Ni 3.00 to 5.50; Cr 21.50 to 24.50; Mo 0.05 to 0.60; Cu 0.05 to 0.60; N 0.05 to 0.20

Austenitic-ferritic, No. 7 (No. 73, S22553) 022Cr25Ni6Mo2N: C 0.030; Si 1.00; Mn 2.00; P 0.035; S 0.030; Ni 5.50 to 6.50; Cr 24.00 to 26.00; Mo 1.20 to 2.50; N 0.10 to 0.20

Austenitic-ferritic, No. 8 (No. 76, S25073) 022Cr25Ni7Mo4N: C 0.030; Si 0.80; Mn 1.20; P 0.035; S 0.020; Ni 6.00 to 8.00; Cr 24.00 to 26.00; Mo 3.00 to 5.00; Cu 0.50; N 0.24 to 0.32

Ferritic, No. 9 (No. 83, S11203) 022Cr12: C 0.030; Si 1.00; Mn 1.00; P 0.040; S 0.030; Ni (0.60); Cr 11.00 to 13.50

Note 1: Except where a range or a minimum is indicated, the values listed are maximum values. Values in parentheses are the maximum permitted additions.

Note 2: For the selection of bar steels, see Annex A.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 19 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223.58 · JGJ 107

Cited by

GB/T 42796-2023Reinforcement couplers for mechanical splices of bars

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