Q/BQB 403-2009_English: PDF (Q/BQB403-2009)
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[Replaced by Q/BQB 408] Cold-rolled low carbon steel plate and steel strip
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Q/BQB 403-2009
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| Q/BQB 403-2003 | English | 70 |
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Cold-rolled low carbon steel plate and steel strip
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Q/BQB 403-2003
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| Standard_ID | Q/BQB 403-2009 (Q/BQB403-2009; QBQB 403-2009; QBQB403-2009) | | Description (Translated English) | Cold-rolled low carbon steel plate and steel strip | | Sector / Industry | Chinese Industry Standard | | Word Count Estimation | 5,000 | | Drafting Organization | BaoSteel Group | | Administrative Organization | BaoSteel Group | | Standard_ID | Q/BQB 403-2003 (Q/BQB403-2003; QBQB 403-2003; QBQB403-2003) | | Description (Translated English) | Cold-rolled low carbon steel plate and steel strip | | Sector / Industry | Chinese Industry Standard | | Word Count Estimation | 5,000 | | Drafting Organization | BaoSteel Group | | Administrative Organization | BaoSteel Group |
Q/BQB 403-2009
Q/BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON & STEEL CO., LTD.
Replacing Q/BQB 403-2003, BZJ 492-2004
Cold-rolled low carbon steel plate and strip
Issued on. January 08, 2009 Implemented before. June 30, 2009
BAOSHAN IRON & STEEL CO., LTD.
Table of Contents
1 Scope ... 3
2 Normative references ... 3
3 Classification and code ... 4
4 Information required for ordering ... 5
5 Dimension, shape, weight and permissible tolerance ... 5
6 Technical requirements ... 6
7 Inspection and test ... 8
8 Packaging, mark and quality certificate ... 10
9 Rules of rounding off ... 10
10 Comparison of similar designations ... 10
Appendix A ... 11
Additional explanation... 12
Cold-rolled low carbon steel plate and strip
1 Scope
This Standard specifies the classification and code, dimension, shape, weight,
technical requirements, inspection and test, packaging, marking and quality
certificate etc. of cold-rolled low carbon steel plate and strip.
This Standard is applicable to cold-rolled low carbon steel plate and strip
(hereinafter refer as steel plate and steel strip) of which the thickness is
0.17mm~3.5mm, produced by Baoshan Steel Co. Ltd.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Standard,
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 222-2006 Method of sampling steel for determination of chemical
composition and permissible variations for product analysis
GB/T 223 Chemical analysis method of steel and alloy
GB/T 228-2002 Metallic materials - Tensile testing at ambient temperature
GB/T 2523-2008 Measuring method of surface roughness and peak count
for cold-rolled metal sheet (strip)
GB/T 2975-1998 Steel and steel products - Location and preparation of test
pieces for mechanical testing
GB/T 5027-2007 Metallic materials - Sheet and strip - Determination of
plastic strain ratio (r-values)
GB/T 5028-1999 Metallic materials - Sheet and strip - Determination of
tensile strain hardening exponent (n-values)
GB/T 8170-2008 Rules for rounding off of numerical values
Table 3.
Table 3
Surface structure Code
Dull surface D
Bright surface B
4 Information required for ordering
4.1 The customer shall provide the following information when ordering goods.
a) Product name
b) This product standard number
c) Designation
d) Product specification and size, and roughness precision
e) Edge status
f) Surface structure
g) Quality level of surface
h) Packaging method
i) Use purpose
4.2 If size, roughness precision, surface structure, quality level of surface, edge
status and packaging method are not indicated in the ordering contract, then
the edge-sheared steel strip and edge-sheared steel plate, that are with
ordinary size and roughness precision, dull textured surface, surface quality of
FB level, shall be supplied; and the packaging method shall be provided
according to the supplier.
5 Dimension, shape, weight and permissible
tolerance
Dimension, shape, weight and permissible tolerance of steel plate and steel
strip shall comply with the provision of Q/BQB 401.
Table 6
Designation Tensile Strain Mark
DC01 Within 3 months after the date of completion of manufacturing, it shall have no tensile strain mark when use.
DC03, DC04 Within 6 months after the date of completion of manufacturing, it shall have no tensile strain mark when use.
DC05, DC06, DC07 It shall have no tensile strain mark when use.
6.6 Surface quality
6.6.1 Surface of steel plate and strip shall have no defects such as scar, crack
and impurities that are harmful for the usage; there must not have delamination.
6.6.2 Characteristics of surface quality level of steel plate and strip are indicated
in Table 7.
Table 7
Level Code Characteristics
Relative high-
level finishing
surface
FB
The surface is allowed to have defects that do not affect the
moldability AND adhesion of painting and plating, such as,
slight scratching, press-mark, dot, roller-mark and oxidation
color.
High-level
finishing
surface
FC
There is no obvious defect, that is visible by naked eyes, on the
better side of the product; and the other side must at least meet
the requirements of FB.
Ultra high-
level finishing
surface
FD
There must not have any defect on the better side of the
product, that is, it shall not affect the appearance quality after
painting or plating; the other side must at least meet the
requirements of FB.
6.6.3 For steel strip, as there is no chance to cut the defective part, so it is
allowed to deliver with defects. However, the defective part shall not exceed 6%
of total length of each roll.
6.7 Surface structure
When surface structure is dull (D), the average roughness Ra shall be
controlled within 0.6µm < Ra ≤ 1.9µm; when surface structure is bright (B), the
average roughness Ra shall be controlled Ra ≤ 0.9µm.
7 Inspection and test
7.1 The appearance of steel plate and strip shall be inspected by naked eyes.
7.2 Dimension and shape of steel plate and strip shall be measured by
8 Packaging, mark and quality certificate
Packaging, mark and quality certificate of steel plate and strip shall be in
accordance with the provision of Q/BQB 400. If the demand-side has special
requirements for packaging weight, it shall be indicated in the contract.
9 Rules of rounding off
Rules of rounding off shall be in accordance with the provisions of GB/T 8170.
10 Comparison of similar designations
Comparison of similar designations between this Standard and domestic-
foreign standards is shown in Appendix A.
Appendix A
(Informative)
Comparison table of designations between this Standard and domestic-
foreign standards
Table A.1
Q/BQB 403-2009 ISO 3754.1999 EN 10130.2006
GB/T 5213-
Q/BQB 403-2003
BZJ 492-2004
DC01 CR1 DC01 DC01 DC01
DC03 CR2 DC03 DC03 DC03
DC04 CR3 DC04 DC04 DC04
DC05 CR4 DC05 DC05 DC05
DC06 CR5 DC06 DC06 DC06
DC07 - DC07 DC07 -
Additional explanation.
This Standard was formulated by reference to EN 10130-2006.
This Standard replaces Q/BQB 403-2003 and BZJ 492-2004.
Compared with Q/BQB 403-1999 and BZJ 492-2004, the main changes of this
Standard are as follows.
— Add new designation DC07;
— Modify the yield strength, tensile strength, elongation rate after fracture,
r-value and n-value of relevant designations.
Appendix A of this Standard is informative.
This Standard was proposed by Technical Quality Management Department of
Baoshan Steel Co., Ltd.
This Standard was proposed by Technical Quality Management Department of
Baoshan Steel Co., Ltd.
The drafter of this Standard. Tu Sulin.
This Standard was first issued in 1988, first revised in 1994, secondly revised
in 1999, and thirdly revised in 2003. This is the fourth revision.
......
Q/BQB 403-2003 (Replaced by Q/BQB 403-2009)
Q/BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON & STEEL CO., LTD.
Replacing Q/BQB 403-1999, BZJ 407-1999
Cold-rolled low carbon steel plate and strip
(Please note that this Standard has been replaced by
Q/BQB 403-2009)
ISSUED ON. JUNE 04, 2003
IMPLEMENTED ON. DECEMBER 15, 2003
BAOSHAN IRON & STEEL CO., LTD.
Table of Contents
1 Scope ... 3
2 Normative references ... 3
3 Classification and code ... 4
4 Information required for ordering ... 4
5 Dimension, shape, weight and permissible tolerance ... 5
6 Technical requirements ... 5
7 Inspection and test ... 8
8 Packaging, mark and quality certificate ... 9
9 Rules of rounding off ... 9
Appendix A ... 10
Additional explanation... 11
Cold-rolled low carbon steel plate and strip
1 Scope
This Standard specifies the classification and code, dimension, shape, weight,
technical requirements, inspection and test, packaging, marking and quality
certificate etc. of cold-rolled low carbon steel plate and strip.
This Standard is applicable to cold-rolled low carbon steel plate and strip
(hereinafter refer as steel plate and steel strip) of which the thickness is
0.30mm~3.5mm, produced by Baoshan Steel Co. Ltd.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Standard,
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 222-1984 Method of sampling steel for determination of chemical
composition and permissible variations for product analysis
GB/T 223 Chemical analysis method of steel and alloy
GB/T 228-2002 Metallic materials - Tensile testing at ambient temperature
GB/T 2975-1998 Steel and steel products - Location and preparation of test
pieces for mechanical testing
GB/T 5027-1999 Metallic materials - Sheet and strip - Determination of
plastic strain ratio (r-values)
GB/T 5028-1999 Metallic materials - Sheet and strip - Determination of
tensile strain hardening exponent (n-values)
GB/T 8170-1987 Rules for rounding off of numerical values
Q/BQB 400-2003 Packaging, marking and quality certificate of cold-rolled
products
a) Product name
b) This product standard number
c) Designation
d) Product specification and size, and roughness precision
e) Edge status
f) Surface structure
g) Quality level of surface
h) Packaging method
i) Use purpose
4.2 If size, roughness precision, surface structure, quality level of surface, edge
status and packaging method are not indicated in the ordering contract, then
the edge-sheared steel strip and edge-sheared steel plate, that are with
ordinary size and roughness precision, dull textured surface, surface quality of
FB level, shall be supplied; and the packaging method shall be provided
according to the supplier.
5 Dimension, shape, weight and permissible
tolerance
Dimension, shape, weight and permissible tolerance of steel plate and steel
strip shall comply with the provision of Q/BQB 401.
6 Technical requirements
6.1 Chemical composition
6.1.1 Chemical composition of steel (melting analysis) shall comply with the
provision of Table 4.
Table 4
Designation
Chemical composition %
C Mn P S Alta Tib
DC01 (St12) ≤0.10 ≤0.50 ≤0.035 ≤0.025 ≥0.020 ---
DC03 (St13) ≤0.08 ≤0.45 ≤0.030 ≤0.025 ≥0.020 ---
DC04 (St14, St15) ≤0.08 ≤0.40 ≤0.025 ≤0.020 ≥0.020 ---
DC05 (BSC2) ≤0.008 ≤0.30 ≤0.020 ≤0.020 ≥0.015 ≤0.20
DC06(St16, St14-T, BSC3) ≤0.006 ≤0.30 ≤0.020 ≤0.020 ≥0.015 ≤0.20
a For designations DC01, DC03 and DC04, when C ≤ 0.01, Alt ≥ 0.015.
b Nb may be used to replace partial Ti; at this time, the total contents of Nb and Ti ≤ 0.02.
6.1.2 Permissible tolerance of chemical composition of steel plate and steel
strip’s finished-product shall be in accordance with the provisions of GB/T 222.
6.2 Smelting method
Oxygen converter is adopted for the smelting of steel plate and strip.
6.3 Delivery status
6.3.1 Cold-rolled steel plate and steel strip are delivered after annealing and
flattening.
6.3.2 Steel plate and strip are usually oiled when they are delivered. The oil film
shall be able to be removed with alkaline aqueous solutions. The supplier
guarantees that the products will not rust in 6 months, since the date of
manufacturing, under the normal conditions of non-naked package,
transportation, loading-unloading and storage. According to the demand-side’s
requirements, agreed by both sides and indicated in the contract, it can be
delivered without oiling.
6.4 Mechanical property
Mechanical property of steel plate and strip shall be in accordance with the
provision of Table 5.
6.6.2 Characteristics of surface quality level of steel plate and strip are indicated
in Table 7.
6.6.3 For steel strip, as there is no chance to cut the defective part, so it is
allowed to deliver with defects. However, the defective part shall not exceed 6%
of total length of each roll.
Table 7
Level Code Characteristics
Relative high-
level finishing
surface
FB (O3)
The surface is allowed to have defects that do not affect
the moldability AND adhesion of painting and plating, such
as, slight scratching, press-mark, dot, roller-mark and
oxidation color.
High-level
finishing surface FC (O4)
There is no obvious defect, that is visible by naked eyes,
on the better side of the product; and the other side must
at least meet the requirements of FB.
Ultra high-level
finishing surface FD (O5)
There must not have any defect on the better side of the
product, that is, it shall not affect the appearance quality
after painting or plating; the other side must at least meet
the requirements of FB.
6.7 Surface structure
When surface structure is dull (D), the average roughness Ra shall be
controlled within 0.6µm < Ra ≤ 1.9µm; when surface structure is bright (B), the
average roughness Ra shall be controlled Ra ≤ 0.9µm.
7 Inspection and test
7.1 The appearance of steel plate and strip shall be inspected by naked eyes.
7.2 Dimension and shape of steel plate and strip shall be measured by
appropriate tools.
7.3 r-value is obtained and calculated when it is at 16% strain; n-value is
obtained and calculated within the range of 10%~20% strain; when the uniform
elongation rate is less than 20%, the strain range is 10% to the end of uniform
elongation.
7.4 Inspection item, quantity of test sample, sampling method, test method, and
sampling direction of each batch of steel plate and strip shall be in accordance
with the provision of Table 8.
Appendix A
(Informative)
Comparison list of similar designations in this Standard, adopted
standards and relevant standards
Table A.1
Standard
No. Q/BQB 403-2003
EN
10130-1999
EN
10130-1991
DIN
1623-(1)-1983
GB/T 5213-
Q/BQB 403-1999
BZJ 407-1999
Designati
ons
DC01 (St12) DC01 FeP01 St12 - St12
DC03(St13) DC03 FeP03 RRSt13 - St13
DC04 (St14, St15) DC04 FeP04 St14 SC1
St14, St14F,
St14HF,
St14ZF, St15
DC05 (BSC2) DC05 FeP05 - SC2 BSC2
DC06 (St16, St14-
t, BSC3) DC06 FeP06 - SC3
St16, St14-T,
BSC3
Additional explanation.
Consistent degree between this Standard and EN 10130-1999 is not equivalent.
This Standard replaces Q/BQB 403-1999 and BZJ 407-1999.
Compared with Q/BQB 403-1999, the main changes of this Standard are as
follows.
— Modify and integrate the designations;
— Surface quality level is changed from two to three;
— Surface structure is changed from four to two; and add the control value
of surface roughness;
— Delete the provisions that St14 is divided into three levels F, HF and ZF
according to tensile level;
— Delete the marking example;
— Delete the provision about chemical composition Si and residual
elements; modify the contents of elements such as C, S, Alt;
— Modify the yield strength, tensile strength and elongation rate after
fracture; delete the provision about hardness and Erichsen value; and
add the provision about r-value and n-value of DC04, DC05 and DC06;
— Add the provision about tensile strain mark;
— Percentage of steel strip with permissible defects is changed from 8% to
6%;
— Modify the provision about re-inspection;
— Add the provision about rules of rounding off.
Appendix A of this Standard is informative.
This Standard was proposed by Manufacturing Management Department of
Baoshan Steel Co., Ltd.
This Standard is drafted by Manufacturing Management Department of
Baoshan Steel Co., Ltd.
The drafter of this Standard. Xu Hongwei.
This Standard was first issued in 1988, first revised in 1994, secondly revised
in 1997, and thirdly revised in 1999.
......
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