Q/BQB 313-2018 English PDF (QBQB313-2018)

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Q/BQB 313-2018: Continuously-hot-rolled steel sheets and strips for building structures
Q/BQB 313-2018
ENTERPRISE STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Continuously-hot-rolled steel sheets
and strips for building structures
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 ... 6
Enterprise commitments
The content of Q/BQB 313-2018, Continuously-hot-rolled steel sheets and strips for
building structures, 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).
1 Dimension, shape, weight and tolerances
1.1 Negative deviation of steel sheets and strips is 0.30 mm; tolerance zone is as
specified in the tolerance zone of the thickness tolerance table of Q/BQB 301. Other
dimensions, shapes, weight and tolerances shall be as specified in Q/BQB 301.
1.2 If the purchaser has any higher requirement for thickness accuracy, the tolerance
zone specifications of high accuracy PT.C given in Table 4 of Q/BQB can be selected
as tolerance zone during ordering.
2 Technical requirements
Table 2
Designation
Chemical compositiona (mass fraction)/%
C Si Mn P S Ceq
SN400A ≤ 0.24 - - ≤ 0.025 ≤ 0.025 -
SN400B ≤ 0.20 ≤ 0.35 0.60 ~ 1.40 ≤ 0.025 ≤ 0.015 ≤ 0.36
SN490B ≤ 0.18 ≤ 0.35 ≤ 1.60 ≤ 0.025 ≤ 0.015 ≤ 0.44
a Other alloy elements can be added as needed.
Table 3
Table 8
Designation Nominal thickness mm
Tensile testa
V impact testa
L0 = 200 mm, b = 40 mm
Lower yield
strengthc
ReL/MPa
Tensile
strength
Rm/MPa
Yield
ratio
Percentage
elongation
after
fracture/%
Test
temperature
°C
Impact
absorbed
energy
KV2, J
SN400A
6 ~ 16
≥ 235 400 ~ 510 -
- -
> 16 21