Q/BQB 614-2023 English PDF

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Q/BQB 614-2023: Atmospheric corrosion resisting steel plates for welded structure

Q/BQB 614: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
Q/BQB 614-2023	319	Add to Cart	3 days	Atmospheric corrosion resisting steel plates for welded structure
Q/BQB 614-2018	225	Add to Cart	Auto, < 3 mins	Atmospheric corrosion resisting steel plates for welded structure

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Basic data

Standard ID: Q/BQB 614-2023 (Q/BQB614-2023)
Description (Translated English): Atmospheric corrosion resisting steel plates for welded structure
Sector / Industry: Chinese Industry Standard
Classification of Chinese Standard: QBQ
Word Count Estimation: 9,934
Date of Issue: 2023-04-09
Date of Implementation: 2023-07-01
Issuing agency(ies): Baoshan Iron & Steel Co., Ltd.

Q/BQB 614-2018: Atmospheric corrosion resisting steel plates for welded structure

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Atmospheric corrosion resisting steel plates for welded structure release Instead of BZJ 614-2013 Corrosion-resistant thick steel plate for welded structure Published on.2018-01-15 2018-04-10 Implementation

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009 "Standardization Work Guidelines Part I. Standard Structure and Compilation". This standard is based on market demand and combined with the actual situation of Baosteel. This standard replaces BZJ 614-2013 "Aerial corrosion resistant thick steel plate for welded structures", and the main changes compared with the original standard are as follows. -- The normative reference file adds a reference to GB/T.20125 and adds the GB/T 2975 number. Appendix A of this standard is an informative annex. This standard was proposed by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. This standard is under the jurisdiction of the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. This standard was drafted by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. The drafter of this standard is Huang Jinhua. This standard was first published in January.2018. Corrosion-resistant thick steel plate for welded structure

1 Scope

This standard specifies the dimensions, shape, technical requirements, test and inspection, marking and inspection of thick steel plates resistant to atmospheric corrosion for welded structures. Pieces and so on. This standard applies to the atmospheric corrosion resistant thick steel plate for welded structures produced by Baoshan Iron and Steel Co., Ltd.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 223 steel and alloy chemical analysis method GB/T 228.1 tensile testing of metallic materials - Part 1 GB/T 229 metal material Charpy pendulum impact test method GB/T 2975-1998 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.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.20125 Determination of multi-element content of low alloy steels by inductively coupled plasma atomic emission spectrometry General technical requirements for Q/BQB 600 thick steel plate

3 General technical requirements

Unless otherwise specified in this standard, steel plates supplied in accordance with this standard shall comply with the corresponding requirements of Q/BQB 600.

4 classification and code

The grade, nominal thickness and use of the steel plate are shown in Table 1. Table 1 Brand nominal thickness mm SMA400AW, SMA400BW, SMA400AP, SMA400BP SMA490AW, SMA490BW, SMA490AP, SMA490BP 5~150 Used for bridges that require excellent weldability, Construction and other structural components. SMA400CW, SMA400CP, SMA490CW, SMA490CP 5~100 SMA570W, SMA570P 5~100 Note 1. Steel plates with “W” on the grades are usually used under bare exposure or chemically treated with corrosion resistance. Note 2. Steel plates with a “P” rating are usually used after painting.

5 Technical requirements

5.1 Brand and chemical composition 5.1.1 The grade and chemical composition of the steel (melting analysis) shall comply with the requirements of Table 2. Table 2 Brand Chemical composition a (melting analysis) % C Si Mn PS Cu Cr Ni SMA400AW SMA400BW SMA400CW ≤0.18 0.15～0.65 ≤1.25 ≤0.035 ≤0.035 0.30~ 0.50 0.45~ 0.75 0.05~ 0.30 SMA400AP SMA400BP SMA400CP ≤0.18 ≤0.55 ≤1.25 ≤0.035 ≤0.035 0.20～0.35 0.30~ 0.55 - SMA490AW SMA490BW SMA490CW ≤0.18 0.15～0.65 ≤1.40 ≤0.035 ≤0.035 0.30~ 0.50 0.45~ 0.75 0.05~ 0.30 SMA490AP SMA490BP SMA490CP ≤0.18 ≤0.55 ≤1.40 ≤0.035 ≤0.035 0.20～0.35 0.30~ 0.55 - SMA570W ≤0.18 0.15～0.65 ≤1.40 ≤0.035 ≤0.035 0.30~ 0.50 0.45~ 0.75 0.05~ 0.30 SMA570P ≤0.18 ≤0.55 ≤1.40 ≤0.035 ≤0.035 0.20～0.35 0.30~ 0.55 - a Effective elements resistant to atmospheric corrosion such as Mo, Nb, Ti, V and Zr may be added, but the total amount of these elements shall not exceed 0.15%. 5.1.2 The formula for calculating the carbon equivalent and welding crack sensitivity coefficient shall comply with Table 3. table 3 Project calculation formula a Carbon equivalent 14 Mo Cr Ni Si MnCeq C Welding crack sensitivity coefficient B510 Mo Cr Ni Cu Mn SiCPcm  a Calculate the chemical composition of the formula using the value of the smelting analysis 5.1.3 The carbon equivalent weight of the SM570W and SM570P delivered in quenched and tempered condition and the steel plate delivered by thermomechanical control shall comply with the requirements of Table 4. Table 4 Grade delivery status Carbon equivalent Ceq, % Thickness, mm ≤50 >50～100 >100 SM570W, SM570WP QT ≤0.44 ≤0.47 - SMA490AW, SMA490BW SMA490CW TM ≤0.41 ≤0.43 agreement SMA490AP, SMA490BP SMA490CP ≤0.40 ≤0.42 agreement 5.1.4 According to the requirements of the purchaser, the supplier and the buyer shall consult and indicate in the contract that the SM570W and SM570P are delivered in a quenched and tempered state. The carbon equivalent of the steel plate delivered by mechanically controlled rolling can be replaced by the welding crack sensitivity coefficient, and the welding crack sensitivity coefficient should meet the requirements of Table 5. table 5 Grade delivery status Welding crack sensitivity coefficient Pcm,% Thickness, mm ≤50 >50～100 >100 SM570W, SM570WP QT ≤ 0.28 ≤ 0.30 - SMA490AW, SMA490BW SMA490CW TM ≤0.24 ≤0.26 agreement SMA490AP, SMA490BP SMA490CP ≤0.24 ≤0.26 agreement 5.2 Mechanical properties 5.2.1 The mechanical properties of the steel plate shall comply with the requirements of Tables 6 and 7 respectively. 5.2.2 Shock absorption energy is the average of the test results of a group of three samples, allowing the test result of one of the samples to be less than the specified value, but Not less than 70% of the specified value. 5.2.3 The impact test is only applicable to steel plates with a thickness of 6 mm or more. When impact test is carried out on steel plates with a thickness of 12 mm or more, Using 10.0mm × 10.0mm × 55mm standard specimens, the test results should meet the specified values in the table; for thickness greater than or equal to 6mm and less than When the 12.0mm steel plate is subjected to the impact test, an auxiliary sample of 7.5mm × 10.0mm × 55mm or 5.0mm × 10.0mm × 55mm shall be used. The test results are not less than 75% or 50% of the values specified in the table. Table 6 Brand Tensile test a Upper yield strength MPa, ≥ Tension strength MPa Elongation after break %, ≥ Tensile specimen number (size, mm) P16 b (L0=200, b=40) (L0=50, d=14)b Thickness, mm thickness, mm ≤16 >16～ >40～ >75 ~100 >100～ ≤16 >16～50 >40 SMA400AW, SMA400AP SMA400BW, SMA400BP 245 235 215 215 400～540 17 21 23 SMA400CW, SMA400CP - SMA490AW, SMA490AP SMA490BW SMA490BP 365 355 335 325 490～610 15 19 21 SMA490CW SMA490CP - SMA570W, SMA570P 460 450 430 420 - 570~720 19c(P14) 26c(P14) 20 a Tensile test takes a transverse test specimen; when the yielding phenomenon is not obvious, Rp0.2 is used. b For the thickness of the steel plate >40mm~50mm, the tensile test sample at the time of arbitration is L0=50mm and d=14mm. For non-proportional samples, Lc ≈ 60 mm, r ≥ 15 mm. C When the thickness is ≤ 50 mm, it is suitable for samples with tensile specimen numbers P14 (L0=50, b=25). Table 7 Brand V-type impact test a Thickness >12mm Test temperature °C shock absorption energy KV2 J, ≥ SMA400BW SMA400BP 0 27 SMA400CW SMA400CP 0 47 SMA490BW SMA490BP 0 27 SMA490CW SMA490CP 0 47 SMA570W SMA570P -5 47 a Impact test Take a longitudinal test specimen, and the impact test specimen is a standard specimen. 5.2.4 If the impact test result does not meet the specified requirements, three additional samples may be taken on the same sampled product for testing. The average value of the six samples should not be less than the specified value, and the sample below the specified value can only have at most two, only one of which is allowed to be small. At 70% of the specified value. 5.3 Surface quality For steel plates with SMA570W and SMA570P, if welding repair is required, it should be agreed between the supplier and the buyer.

6 Inspection and testing

6.1 Types of inspection documents shall comply with the provisions of 6.2 to 6.4 when selecting the specified inspection and test. 6.2 The number of samples, sampling methods and test methods required for each batch of steel plate inspection items shall comply with the requirements of Table 8. Table 8 No. Test item number of samples, one sampling method c test method 1 Chemical analysis a 1 (per furnace) GB/T 222 GB/T 223, GB/T 4336, GB/T 20123, GB/T.20125 or General Party 2 Tensile test b 1 GB/T 2975 GB/T 228.1 3 Impact test 1 group (3) GB/T 2975 Thickness ≤ 40mm, Figure A11 a) Thickness > 40mm, Figure A11 b) GB/T 229 a When arbitrating, the test method adopts GB/T 223. b For L0=50, d=14 tensile specimen, the blank position is according to GB/T 2975. thickness < 50, Fig. A10 c); thickness ≥50mm, Fig. A10 d). c When it is not possible to sample at the specified sampling position, it should be as close as possible to that position. 6.3 sampling frequency 6.3.1 Sampling frequency of chemical composition analysis Melting analysis of chemical components by furnace. 6.3.2 Sampling frequency of tensile properties Each batch shall be composed of steel plates with a weight not greater than 50 tons, the same furnace number, the same grade, a maximum thickness not greater than 2 times the minimum thickness, and the same delivery status. to make. When the batch weight is greater than 50 tons, take two samples. When the batch consists of a single sheet of steel, take one sample. 6.3.3 Sampling frequency of impact performance Each batch shall consist of steel plates of the same furnace number, the same grade, and the same delivery status. The specimen shall be taken from the thickest steel plate in the batch. 6.3.4 The negotiation rules may be determined separately by negotiation between the supplier and the buyer. 6.4 Re-test of impact test If the impact test results do not meet the specified requirements, the single-plate steel that has been tested and the results are not acceptable cannot be accepted, and is the same as the sampled steel plate. The thickness of the steel plate is submitted to the impact test and acceptance one by one, and the impact test and acceptance are submitted to the new batch of steel plates of other thicknesses.

8 Appendix

Appendix A (informative appendix) lists the comparison table of this standard and the reference standard.

Appendix A

(informative appendix) This standard is similar to the reference standard Table A.1 SMA400AW SMA400AW SMA400BW SMA400BW SMA400CW SMA400CW SMA400AP SMA400AP SMA400BP SMA400BP SMA400CP SMA400CP SMA490AW SMA490AW SMA490BW SMA490BW SMA490CW SMA490CW SMA490AP SMA490AP SMA490BP SMA490BP SMA490CP SMA490CP SMA570W SMA570W SMA570P SMA570P ......

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