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Q/BQB 312-2018 English PDF (QBQB312-2018)

Q/BQB 312-2018 English PDF (QBQB312-2018)

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Q/BQB 312-2018: Advanced high-strength continuously-hot-rolled steel sheets and strips for cold forming

The content of Q/BQB 312-2018, Advanced high-strength continuously-hot-rolled steel sheets and strips for cold forming, which was drafted and issued by our corporation, complies with the requirements of relevant national laws and regulations, compulsory standards and relevant industrial policies. It was issued by the corporate representative in the procedures specified. The products of out corporation comply with all technical requirements of this Standard; a reference to this Standard is indicated on the products package. Our corporation is responsible for the authenticity, accuracy and legitimacy of the information declared and bears all legal liabilities for the consequences caused by the implementation of this Standard.
Q/BQB 312-2018
BQB
ENTERPRISE STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
Advanced high-strength continuously-hot-rolled steel
sheets and strips for cold forming
Issued on. February 7, 2018
Issued by. Baoshan Iron and Steel Co., Ltd.
Table of Contents
Enterprise commitments ... 3
Technical Indexes 1 ... 4
1 Dimension, shape, weight and tolerances ... 5
2 Technical requirements ... 5
3 Inspection and test ... 8
Enterprise commitments
The content of Q/BQB 312-2018, Advanced high-strength continuously-hot-rolled steel sheets and strips for cold forming, which was drafted and issued by our corporation, complies with the requirements of relevant national laws and regulations, compulsory standards and relevant industrial policies. It was issued by the corporate representative in the procedures specified. The products of out corporation comply with all technical requirements of this Standard; a reference to this Standard is indicated on the products?€? package. Our corporation is responsible for the authenticity, accuracy and legitimacy of the information declared and bears all legal liabilities for the consequences caused by the implementation of this Standard.
Baoshan Iron and Steel Co., Ltd.
February 7, 2018
Technical Indexes 1
Names of indexes. the major technical indexes such as compositions and properties Requirements for indexes. for the major technical indexes, such as compositions and properties, and their test methods, see annexes (see page 4 for details). Table 7
Designation
Tensile testa
Average limit hole
expansion rate/%
Lower yield
strengthb,c
ReL/MPa
Tensile
strength
Rm/MPa
Percentage elongation after
fractured/%
L0 = 80 mm, b =
20 mm
L0 = 50 mm,
b = 25 mm
BR300/450HE 300 ~ 400 450 ~ 600 ??? 24 ??? 27 ??? 80
BR440/590HE
(BR440/580HE) 440 ~ 600 590 ~ 700 ??? 15 ??? 18
BR600/780HE 600 ~ 760 780 ~ 900 ??? 15 ??? 50
FB590 440 ~ 600 ??? 15 ??? 18
FB780 ??? 680 780 ~ 900 ??? 12 ??? 15 ??? 50
a The specified values of tensile test apply to longitudinal test pieces. b When yield is not obvious, use Rp0.2.
c As agreed by the interested parties, the minimum yield strength is not required. d For thickness ??? 3 mm, it is specified that the minimum elongation after fracture is reduced by 2%. If the purchaser does not specify the dimensions of test pieces, use L0 = 50 mm, b = 25 mm. Table 8
Designation
Tensile testa 180?? bend testb
d ?€? diameter of bend
centre
a ?€? thickness of test
piece
Lower yield
strengthc,d
ReL/MPa
Tensile
strength
Rm/MPa
Percentage elongation after
fractured/%
(L0 = 80 mm, b = 20 mm)
BR900/1200MS 900 ~ 1150 ??? 1180 ??? 5 d = 8a
a The specified values of tensile test apply to longitudinal test pieces. b The specified values of tensile test apply to lateral test pieces, with the width of bend test piece b ??? 20 mm and b = 20 mm in arbitration test.
c When yield is not obvious, use Rp0.2.
c As agreed by the interested parties, the minimum yield strength is not required. Table 9

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