Q/BQB 312-2023 (Q/BQB312-2023, QBQB 312-2023, QBQB312-2023) & related versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Similar PDF |
| Q/BQB 312-2023 | English | 419 |
Add to Cart
|
3 days
|
Continuously hot-rolled advanced high strength steel sheet and strip for cold forming
|
Q/BQB 312-2023
| |
QBQB 312-2023
|
| Q/BQB 312-2018 | English | 160 |
Add to Cart
|
0-9 seconds. Auto delivery.
|
Advanced high-strength continuously-hot-rolled steel sheets and strips for cold forming
|
Q/BQB 312-2018
| |
QBQB 312-2018
|
Q/BQB 312-2023: PDF in English (QBQB 312-2023)
Q/BQB 312-2018
BQB
ENTERPRISE STANDARD OF THE
PEOPLE’S 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
......
| Standard ID | Q/BQB 312-2023 (Q/BQB312-2023) | | Description (Translated English) | Continuously hot-rolled advanced high strength steel sheet and strip for cold forming | | Sector / Industry | Chinese Industry Standard | | Classification of Chinese Standard | QBQ | | Word Count Estimation | 12,115 | | Date of Issue | 2023-04-09 | | Date of Implementation | 2023-07-01 |
|