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Q/BQB 203-2018

Chinese Standard: 'Q/BQB 203-2018'
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BASIC DATA
Standard ID Q/BQB 203-2018 (Q/BQB203-2018)
Description (Translated English) (Seamless steel pipe for pipes, containers and equipment structures)
Sector / Industry Chinese Industry Standard
Classification of Chinese Standard QBQ
Word Count Estimation 5,576
Administrative Organization Baoshan Iron and Steel Co., Ltd.

Q/BQB 203-2018
ENTERPRISE STANDARD OF
BAOSHAN IRON & STEEL CO., LTD.
Seamless Steel Pipe for Pipelines, Containers
and Equipment Structures
管道, 容器, 设备结构用无缝钢管
Issued on: January 31, 2018
Issued by: BAOSHAN IRON & STEEL CO., LTD.
Table of Contents
Self-commitment ... 3 
Technical Indicator 1 ... 4 
Self-commitment
The content that is stipulated in Q/BQB 203-2018 Seamless Steel Pipe for Pipelines,
Containers and Equipment Structures, which was formulated and published by our
company, complies with relevant national laws and regulations, and requirements in
compulsory standards and relevant industrial policies. In accordance with the
stipulated procedure, this Standard was approved and issued by our enterprise’s legal
representative.
Products that are produced by our company comply with the various technical
requirements stipulated in this Standard. The serial number of standards is clearly
indicated on corresponding product packages. Our company undertakes the
responsibility for the authenticity, accuracy and legitimacy of the disclosed information,
and undertakes all the legal liabilities of consequences triggered by the implementation
of this Standard.
BAOSHAN Iron & Steel Co., Ltd.
January 31, 2018
Technical Indicator 1
Name of indicator: main technical indicators, such as composition and mechanical
properties
Requirement of indicator: please refer to the attachment for the main indicators, such
as composition and mechanical properties, and their test methods
(please refer to Page 4 for details)

Q/BQB 203-2018
(Seamless steel pipe for pipes, containers and equipment structures)
Baoshan Iron and Steel Co., Ltd. Enterprise Standard
Seamless steel pipe for pipelines, containers and equipment structures
Published on.2018-01-31
Baoshan Iron and Steel Co., Ltd. released
Self-commitment
The relevant national laws and regulations, mandatory standards and related industrial policies, and approved by the legal representative of the enterprise in accordance with the prescribed procedures.
release
. The products produced by our company meet the technical requirements stipulated in this standard, and the standard number is on the corresponding product packaging.
Express. Our company is responsible for the truthfulness, accuracy and legality of the public information of the statement, and bears all the consequences of the implementation of this standard.
legal liability.
Baoshan Iron and Steel Co., Ltd.
2018-01-31
Technical indicator 1
Indicator name. Main indicators such as composition and mechanical properties
Indicator requirements. Main indicators such as composition and mechanical properties and test methods are attached
(See page 4 for details)
Chemical composition (melting analysis)
Chemical composition (mass fraction) /%
C Si Mn PS Cr Mo Ni Alt
d Cu N Nb Ti V
St37.0 ≤0.17
0.17~
0.37
0.35~0.65 ≤0.025 ≤0.020≤0.25 - ≤0.25 - ≤0.20 - - - -
St44.0 ≤0.21
0.17~
0.37
0.50~0.80 ≤0.025 ≤0.020≤0.25 - ≤0.25 - ≤0.20 - - - -
St52.0 ≤0.22 ≤0.55 ≤1.60 ≤0.025 ≤0.020≤0.25 - ≤0.25 - ≤0.20 - - - -
CK45
0.42~
0.50
0.17~
0.37
0.50~0.80 ≤0.025 ≤0.020≤0.25 - ≤0.25 - ≤0.20 - - - -
E235 a ≤0.17 ≤0.35 ≤1.20 ≤0.025 ≤0.020 - - - - - - - - -
E275 a ≤0.21 ≤0.35 ≤1.40 ≤0.025 ≤0.020 - - - - - - - - -
E275K2a ≤0.20 ≤0.40 0.50~1.40 ≤0.025 ≤0.020≤0.30≤0.10≤0.30≥0.020≤0.35≤0.015≤0.05≤0.03≤0.05
E315 a ≤0.21 ≤0.30 ≤1.50 ≤0.025 ≤0.020 - - - - - - - - -
E355 a,b ≤0.22 ≤0.55 ≤1.60 ≤0.025 ≤0.020 - - - - - - - - -
E355K2a ≤0.20 ≤0.50 0.90~1.65 ≤0.025 ≤0.020≤0.30≤0.10≤0.50≥0.020≤0.35≤0.015≤0.05≤0.05≤0.12
C22E a,c
0.17~
0.24
0.40
0.40~0.70
0.025
0.020
0.40
0.10
0.40
- - - - - -
C35E a,c
0.32~
0.39
0.40
0.50~0.80
0.025
0.020
0.40
0.10
0.40
- - - - - -
C45E a,c
0.42~
0.50
0.40
0.50~0.80
0.025
0.020
0.40
0.10
0.40
- - - - - -
a By agreement between the supplier and the buyer, elements other than those specified in the table may be added. The supplier can add other elements to improve the castability.
b The supplier may add Nb, V, Ti, but the content of these elements should be reported.
c should satisfy Cr Mo Ni ≤ 0.63%.
d This Alt requirement does not apply if there are sufficient other nitrogen fixation elements.
Longitudinal tensile properties of steel pipes at room temperature
Grade delivery status
Tensile properties a, b
Tensile strength Rm/MPa
Lower yield strength ReL/MPa
Elongation after break
A/%
Wall thickness/mm
≤16 >16
St37.0 Hot rolling or normalizing c 350~480 ≥235 ≥225 ≥25
St44.0 Hot rolling or normalizing c 420~550 ≥275 ≥265 ≥21
St52.0 hot rolling or normalizing c 500~650 ≥355 ≥345 ≥21
CK45 hot rolling or normalizing c 590~730 ≥335 ≥325 ≥14
a When the yielding phenomenon is not obvious, the lower yield strength is replaced by the specified plastic elongation strength Rp0.2.
b Selected by the manufacturer, the specimen is a longitudinal curved specimen or a longitudinal circular cross-section specimen in GB/T 228.1.
c Selected by the supplier, delivered in hot rolled or normalized condition.
Indicator requirements document for Technical Indicator 1
Longitudinal mechanical properties of steel tubes at room temperature
Grade delivery status
Tensile properties a, b
-20 ° C shock absorption energy
KV2/J
not less than
tensile strength
Rm/Mpa
not less than
Upper yield strength
ReH/Mpa
not less than
Elongation after break
A/%
not less than
Wall thickness/mm wall thickness/mm wall thickness/mm
≤16 >16 ≤16 >16 ≤16 >16
E235 hot rolled or normalized c 360 235 225 25 -
E275 hot rolled or normalized c 410 275 265 22 -
E275K2 Normalizing 410 275 265 22 40
E315 Hot rolled or normalized c 450 315 305 21 -
E355 Hot rolled or normalized c 490 355 345 20 -
E355K2 Normalizing 490 355 345 20 40
C22E Normalizing 430 410 240 210 24 25 -
C35E Normalizing 550 520 300 270 18 19 -
C45E Normalizing 620 580 340 305 14 16 -
a When the yielding phenomenon is not obvious, the upp......
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