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Q/BQB 408-2019

Chinese Standard: 'Q/BQB 408-2019'
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Q/BQB 408-2019
ENTERPRISE STANDARD OF BAOSTEEL CO., LTD.
Replacing Q/BQB 408-2018
Low carbon cold-rolled steel sheet and strip for cold
forming
冷成形用冷轧低碳钢板及钢带
ISSUED ON: FEBRUARY 02, 2019
IMPLEMENTED ON: APRIL 10, 2019
Issued by: Baoshan Iron and Steel Co., Ltd.
Table of Contents
Foreword ... 3 
1 Chemical composition ... 4 
2 Mechanical properties ... 4 
3 Inspection and test ... 6 
4 Annex ... 7 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009
“Directives for standardization - Part 1: Structure and drafting of standards”.
This Standard was prepared by referring to JIS G 3141:2017, EN 10130:2006,
JFS A 2001:2014.
This Standard replaces Q/BQB 408-2018.
Compared with Q/BQB 408-2018, main changes in this Standard are as follows:
-- added description on special roughness control requirements;
-- revised Annex C Control table of similar designations of related standards
are home and abroad.
Annex A of this Standard is normative. Annex B and Annex C are informative.
This Standard was proposed by Manufacturing Management Department of
Baoshan Iron and Steel Co., Ltd.
This Standard shall be under the jurisdiction of Manufacturing Management
Department of Baoshan Iron and Steel Co., Ltd.
The drafting organization of this Standard: Manufacturing Management
Department of Baoshan Iron and Steel Co., Ltd.
Drafters of revision of this Standard: Yuan Min, Mao Mingxi.
Versions of standard substituted by this Standard are: Q/BQB 408-1988,
Q/BQB 408-1994, Q/BQB 408-1999, Q/BQB 408-2003, Q/BQB 408-2009,
Q/BQB 408-2014, Q/BQB 408-2018.
Low carbon cold-rolled steel sheet and strip for cold
forming
1 Chemical composition
Table 4
Table 5
Table 6
2 Mechanical properties
Designation Chemical composition
a (melting analysis) % (mass fraction)
a It is allowed to add other alloying elements.
b SPCC-X is a specific designation.
Designation Chemical composition (melting analysis) % (mass fraction)
a It is allowed to add Nb and/or Ti.
b Nb is allowed to replace part of Ti. At this time, the total content of Nb and Ti shall not be greater than 0.20%.
Designation Chemical composition (melting analysis) % (mass fraction)
a It is allowed to add Nb and/or Ti.
b Nb is allowed to replace part of Ti. At this time, the total content of Nb and Ti shall not be greater than 0.20%.

Q/BQB 408-2019
Cold formed low carbon steel sheet and strip for cold forming
Q/BQB 408-2019
Replaces Q/BQB 408-2018
Cold-rolled low-carbon steel plate and strip for cold forming
Low carbon cold-rolled steel sheet and strip for cold forming
2019-02-02 released
2019-04-10 Implementation
release
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1. Structure and Compilation of Standards".
This standard was prepared with reference to JIS G 3141..2017, EN 10130..2006, and JFS A.2001..2014.
This standard replaces Q/BQB 408-2018.
Compared with Q/BQB 408-2018, the main amendments to this standard are as follows.
-Added the expression of special control requirements for roughness;
--Revised the approximate brand comparison table of relevant standards at home and abroad in Appendix C.
Appendix A of this standard is a normative appendix, and appendixes B and C are informative appendixes.
This standard is proposed by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd.
This standard is under the jurisdiction of Baoshan Iron & Steel Manufacturing Co., Ltd.
This standard was drafted by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd.
The drafters of this standard revision. Yuan Min, Mao Mingxi.
The previous versions replaced by this standard are. Q/BQB 408-1988, Q/BQB 408-1994, Q/BQB 408-1999,
Q/BQB 408-2003, Q/BQB 408-2009, Q/BQB 408-2014, Q/BQB 408-2018.
1.Chemical composition
Table 4
Grade chemical composition
a (melting analysis)% (mass fraction)
C Mn PS Alt
SPCC \\ SPCC-Xb ≤0.15 ≤0.60 ≤0.10 ≤0.025-
SPCD ≤0.10 ≤0.45 ≤0.030 ≤0.025 ≥0.015
SPCE ≤0.08 ≤0.40 ≤0.025 ≤0.020 ≥0.015
SPCF ≤0.008 ≤0.30 ≤0.020 ≤0.020 ≥0.015
SPCG ≤0.006 ≤0.25 ≤0.020 ≤0.020 ≥0.015
aAllows the addition of other alloying elements.
b SPCC-X is a specific grade.
table 5
Grade chemical composition (melting analysis)% (mass fraction) C Mn PS Alt Ti
DC01 a ≤0.10 ≤0.50 ≤0.035 ≤0.025 ≥0.015-
DC03 a ≤0.08 ≤0.45 ≤0.030 ≤0.025 ≥0.015-
DC04 a ≤0.08 ≤0.40 ≤0.025 ≤0.020 ≥0.015-
DC05 ≤0.008 ≤0.30 ≤0.020 ≤0.020 ≥0.015 ≤0.20 b
DC06 ≤0.006 ≤0.30 ≤0.020 ≤0.020 ≥0.015 ≤0.20 b
DC07 ≤0.006 ≤0.25 ≤0.020 ≤0.020 ≥0.015 ≤0.20 b
a Allows the addition of Nb and/or Ti.
b Allow Nb to replace part of Ti. At this time, the total content of Nb and Ti should not be greater than 0.20%.
Table 6
Grade chemical composition (melting analysis)% (mass fraction) C Mn PS Alt Ti
BLC a ≤0.10 ≤0.50 ≤0.035 ≤0.025 ≥0.015-
BLD a ≤0.08 ≤0.45 ≤0.030 ≤0.025 ≥0.015-
BUSD ≤0.010 ≤0.40 ≤0.025 ≤0.020 ≥0.015 ≤0.20 b
BUFD ≤0.008 ≤0.30 ≤0.020 ≤0.020 ≥0.015 ≤0.20 b
BSUFD ≤0.006 ≤0.30 ≤0.020 ≤0.020 ≥0.015 ≤0.20 b
a Allows the addition of Nb and/or Ti.
b allows Nb to replace part of Ti, at this time the total content of Nb and Ti is not more than 0.20%.
2.Mechanical properties
Table 7
Grade
Stretching test
rmd, e
Not less than yield strength
a, b, c
MPa
tensile strength
MPa
not less than
Elongation after breaking c
A50mm
not less than
Nominal thickness mm Nominal thickness mm
0.25
0.25 ~
<0.30
0.30 ~
<0.40
0.40 ~
<0.60
0.60 ~
<1.0
1.0. ~
<1.6
1.6
0.5 ~
1.0
> 1.0 ~
1.6
SPCC-270 25 28 31 34 36 37 38--
SPCD 140 ~ 220 270 27 30 33 36 38 39 40--
SPCE 130 ~.200 270 29 32 35 38 40 41 42--
SPCF 120 ~ 190 270--37 40 42 43 44--
SPCG 110 ~ 180 270---42 44 45 46 1.5 1.4
a Use RP0.2 when yielding is not obvious, otherwise use ReL.
b Except for SPCC grades, when the thickness is greater than 0.40mm and not greater than 0.60mm, the specified value of yield strength is allowed to increase by 20MPa; when the thickness is not greater than 0.40mm
At this time, the specified value of yield strength allows an increase of 40 MPa.
The c sample is the No. 5 sample specified in JIS Z 2241, and the sample direction is the longitudinal direction.
When the thickness is less than 0.5mm and the thickness is more than 1.6mm, the r value is not required.
e rm = (r90 2r45 r0) ∕ 4.
Table 8
Grade
Stretching test
Yield strengtha
MPa
tensile strength
MPa
Elongation after breaking b
A50mm
not less than
Nominal thickness mm
<0.25 0.25 ~ <0.30
0.30 ~
<0.40
0.40 ~
<0.60
0.60 ~
<1.0
1.0. ~
<1.6
1.6
SPCC-XS 160 ~ 240 270 ~ 370 26 29 32 35 37 38 39
SPCC-XM 180 ~ 260 280 ~ 380 25 28 31 34 36 37 38
SPCC-XL 220 ~ 300 300 ~ 400 24 27 30 33 35 36 37
a Use RP0.2 when yielding is not obvious, otherwise use ReL.
b The sample is a No. 5 sample specified in JIS Z 2241, and the sample direction is a longitudinal direction.
Note. If the user has special requirements for hardness, it can be implemented according to the recommended reference values in Table B.1 of Appendix B.
Table 9
Grade
Stretching test
r90c
not less than
n90c
Not less than yield strength a MPa
tensile strength
MPa
Elongation after breaking b
A80mm
not less than
Nominal thickness mm
0.30
0.30 ~
<0.50
0.50 ~
<0.70
0.70 ~
<1.0
1.0 ~
<1.6
1.6
DC01d 140 ~ 260 270 ~ 410 24 26 28 30 32 34--
DC03 140 ~ 220 270 ~ 370-30 32 34 35 36 1.3-
DC04 130 ~.200 270 ~ 350-34 36 38 39 40 1.6 0.18
DC05 120 ~ 180 270 ~ 330-35 38 40 40 41 1.9 0.20
DC06 110 ~ 170 260 ~ 330-37 39 41 42 43 2.1 0.22
DC07 100 ~ 150 250 ~ 310-40 42 44 2.5 0.23
a Use RP0.2 when there is no obvious yield, otherwise use ReL. When the thickness is greater than 0.50mm and not greater than 0.70mm, the specified value of yield strength is allowed to increase by 20MPa;
When the thickness is not more than 0.50mm, the specified value of yield strength is allowed to increase by 40MPa.
b The specimen is P6 specimen specified in GB/T 228.1, and the specimen direction is transverse.
The requirements of cr90 value and n90 value only apply to products with a thickness of not less than 0.50mm. When the thickness is greater than 2.0mm, the r90 value is allowed to decrease by 0.2. When the thickness of the product is greater than 2.5mm,
r90 does not require.
d The upper limit of the yield strength of DC01 is only applicable within 8 days from the date the product is manufactured.
Table 10
Grade
Stretching test
r90c
not less than
n90c
Not less than yield strength
MPa
tensile strength
MPa
not less than
Elongation after breaking b
A50mm
not less than
Nominal thickness mm
<0.60 0.60 ~ <1.0 1.0 ~ <1.6 ≥1.6
BLC 150 ~ 260 270 36 38 40 42--
BLD 130 ~ 220 270 39 41 43 45 1.5 0.18
BUSD 120 ~.200 270 41 43 45 47 1.7 0.20
BUFD 120 ~ 180 270 43 45 47 49 2.0 0.21
BSUFD 110 ~ 170 260 45 47 49 51 2.2 0.22
a Use RP0.2 when yielding is not obvious, otherwise use ReL.
The b sample is a No. 5 sample specified in JIS Z 2241, and the sample direction is transverse.
The requirements of C r90 value and n90 value only apply to products with a thickness of not less than 0.50mm. When the thickness is greater than 2.0 mm, the r90 value is allowed to decrease by 0.2. For thicknesses> 2.5 mm
The r value is not required.
3. Inspection and test
Table 14
Number of test items (sampling) Sampling method Test method
Chemical analysis 1/furnace GB/T.20066 GB/T 223, GB/T 4336, GB/T.20123, GB/T.20125, GB/T.20126
Tensile test 1/batch
GB/T 2975......
Related standard:   Q/BQB 401-2019  Q/BQB 410-2019
   
 
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