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Isotropic High-strength Cold Rolled Steel Plate and Strip
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Q/BQB 412-2009
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PDF similar to Q/BQB 412-2009
Basic data | Standard_ID | Q/BQB 412-2009 (Q/BQB412-2009; QBQB 412-2009; QBQB412-2009) | | Description (Translated English) | Isotropic High-strength Cold Rolled Steel Plate and Strip | | Sector / Industry | Chinese Industry Standard | | Word Count Estimation | 5,000 | | Drafting Organization | BaoSteel Group | | Administrative Organization | BaoSteel Group | Q/BQB 412-2009: Isotropic High-strength Cold Rolled Steel Plate and Strip---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Isotropic High-strength Cold Rolled Steel Plate and Strip
Baoshan Iron & Steel Co., Ltd. Enterprise Standard
Isotropic cold rolled high strength steel sheet and strip
Instead of BZJ 412-2007
1 Scope
This standard specifies the classification isotropic cold rolled high strength steel sheet and strip and the code, size, shape, weight, technology to
Requirements, inspection and testing, packaging, labeling and inspection documents.
This standard applies to Baoshan Iron & Steel Co., Ltd. manufactures a thickness of 0.50mm ~ 2.5mm isotropic high-strength
Cold rolling steel sheet and strip (hereinafter referred to as steel sheet and strip).
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
All amendments (not including errata content) or revisions do not apply to this standard, however, encourage up according to the standard
Research into whether the parties to the agreement to use the latest versions of these documents. For undated references, the latest edition
Apply to this standard.
GB/T 222-2006 finished steel chemical composition and permissible variations
GB/T 223 steel and alloy chemical analysis method
GB/T 228-2002 metallic materials at room temperature tensile test method
Methods of measurement GB/T 2523-2008 cold-rolled sheet metal (with) the surface roughness and peak number of
GB/T 2975-1998 steel and steel products for mechanical testing and sample preparation position
GB/T 4336-2002 carbon steel and low alloy steel spark source atomic emission spectrometry methods (conventional
law)
GB/T 5027-2007 Metallic materials - Sheet and strip plastic strain ratio (r value) Determination
Determination of GB/T 5028-2008 Metallic materials - Sheet and strip tensile strain hardening exponent (n value)
GB/T 8170-2008 revised value represents about rules and limit values and judgment
GB/T 20066-2006 Steel and iron - Sampling and determination of the chemical composition of the sample with a sample preparation method
After the GB/T 20123-2006 Steel - Determination of total carbon and sulfur content of the high-frequency induction furnace combustion infrared absorption method
(normal method)
GB/T 20125-2006 Determination of low-alloy steel by inductively coupled plasma atomic emission multi-element content
Spectrometry
GB/T 20126-2006 Determination of non-alloy steel of low carbon content - Part 2. induction furnace (preheated)
After the internal combustion infrared absorption method
Q/BQB 400 cold-rolled products, packaging, labeling and inspection documents
Size Q/BQB 401 cold rolling steel sheet and strip, shape, weight and tolerance
3 Terms and Definitions
3.1 isotropic high-strength steel isotropic steels (I)
Isotropic high-strength steel is a plastic strain ratio (r value) defined steel. Due to the isotropic properties of the steel, and therefore
It has a good stretch forming properties, suitable for the production of automobile outer cover.
4 Classification and designation
4.1 steel sheet and strip and use the code to comply with Table 1.
Table 1
Trademark use
HC220I
(B220IS)
HC260I
(B260IS)
Cold forming
Note. The brackets grades can be used until the end of 2012
4.2 steel sheet and strip by surface quality distinction should meet the requirements of Table 2.
Baoshan Iron & Steel Co. 2009-01-08 Posted 2009-00-00 before implementation
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Table 2
Level code
Higher surface FB
Advanced surface FC
Premium surface FD
4.3 steel sheet and strip by surface structure distinction should be in accordance with Table 3.
table 3
Surface structure code
Pock D
Bright surface B
5 Ordering information required
5.1 users should provide the following information when ordering.
a) Product Name (steel or steel);
b) The product standards;
c) grades;
d) Product specifications and dimensions, roughness accuracy;
e) the edge of the state;
f) surface structure;
g) surface quality levels;
h) packaging;
i) weight;
j) use;
k) Other.
5.2 If the contract does not indicate the size of the order and precision of flatness, surface structure, surface quality level, marginalized and packaging
Mode, the product according to the present standard of ordinary size and flatness accuracy, surface structure of the surface Ma, FB-class surface quality trimming
Or trimming strip steel supply, according to the supplier to provide the packaging packaging.
6 size, shape, weight and tolerance
Size, shape, weight and tolerances shall comply with the provisions of Q/BQB 401 of.
7 Technical Requirements
7.1 Chemical composition
7.1.1 chemical composition of steel (melting analysis) should meet the requirements of Table 4.
Table 4
Chemical composition (Heat analysis)% (mass fraction)
Trademark
C Mn PS Alt
HC220I
(B220IS)
≤0.06 ≤0.80 ≤0.040 ≤0.020 ≥0.015
HC260I
(B260IS)
≤0.08 ≤1.00 ≤0.10 ≤0.020 ≥0.015
7.1.2 finished steel sheet and strip chemical composition tolerances shall comply with the provisions of GB/T 222's.
7.2 Melting Method
Steel sheet and strip steel using oxygen used in smelting.
7.3 Delivery Status
7.3.1 After the steel sheet and strip cold rolling after annealing and smooth delivery.
7.3.2 usually coated steel sheet and strip oil supply, the film of oil should be used to remove an aqueous alkali solution. In conventional packaging, transportation, loading
By unloading and storage conditions, the supplier shall ensure that from the date of manufacture is completed within six months, the surface of the stainless steel sheet and strip. As needed
Request, by mutual agreement and supply and demand in the contract, but also may not be coated with oil supply.
7.4 Mechanical Properties
7.4.1 for guarantees from the date of manufacture within six months of completion of the mechanical properties of the steel sheet and strip shall comply with the requirements of Table 5.
7.4.2 due to aging, the mechanical properties of the steel sheet and strip with the extension of storage time will be deteriorated, such as yield strength
The rise and fall of tensile strength, percentage elongation, formability deteriorates, marks and other tensile strain occurs, it is recommended as soon as possible
use.
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table 5
Tensile tests a, b, c
Grade Yield Strength
MPa
tensile strength
MPa
The Elongation
A80mm
not less than
r90
no greater than
n90
not less than
HC220I
(B220IS) 210 ~ 260 300 ~ 400 34 1.4 0.18
HC260I
(B260IS) 250 ~ 300 320 ~ 420 32 1.4 0.17
When using RP0.2 yield a clear no, otherwise use ReL.
b specimen of GB/sample, a sample of 228 T P6 direction to landscape.
When c is not greater than the thickness of 0.70mm, the Elongation allow reduced by 2%.
7.5 tensile strain mark
Storage conditions at room temperature, the surface quality requirements for the FC and FD steel sheet and strip, make sure that the date of the completion of the manufacture
Tensile strain mark does not appear when you use within six months.
7.6 surface quality
7.6.1 steel sheet and strip surface may not have scars, cracks, inclusions and other use of harmful defects, steel sheet and strip not be partakers
Floor.
7.6.2 Each steel strip surface quality level characteristics and should meet the requirements in Table 6.
7.6.3 For steel, because there is no opportunity to cut with the defective portion, thus strip allowed defect delivery, but the defective unit
Points not more than 6% of the total length of each volume.
Table 6
Level code feature
Higher surface FB surface allows a small amount does not affect the formability and coating, plating adhesion defects, such as minor scratches, indentation, pitting, roll mark and oxidation tint like.
Advanced surface FC products better side in two faces no visible obvious defects, the other side should at least meet the requirements of the FB.
Premium surface FD products two faces in a better side should not affect the quality or appearance after painting after plating appearance quality defects, the other side should at least meet the requirements of the FB.
7.7 surface structure
Surface structure when Pock (D) by the average roughness Ra 0.6μm < Ra≤1.9μm control, surface structure light table
When the surface (B) average roughness Ra press Ra≤0.9μm control.
8 inspection and testing
8.1 steel sheet and strip appearance was visually inspected.
Size 8.2 steel sheet and strip, shape measurement with a suitable measuring instrument.
8.3 r value at 15% strain is calculated, when the uniform elongation is less than 15%, the uniform elongation strain value by the end of the
Calculated. The value of n is in the 10% to 20% strain range is calculated with the uniform elongation is less than 20%, the calculated
Strain range of 10% to the end of the uniform elongation.
8.4 Acceptance steel sheet and strip shall grant each inspection lot shall be not more than 30 tons of the same grade, same size, same processing status
The composition of steel sheet and strip for significant volumes to 30 tons steel, each volume can be used as a test batch.
8.5 each batch of steel sheet and strip the test items, the number of samples, sampling methods, test methods and sampling should be directed in accordance with Table 7
Provisions.
Table 7
Number of samples test items (a) Test Method for Sampling method
Chemical analysis 1/furnace GB/T
GB/T 223, GB/T 4336, GB/T 20123
GB/T 20125, GB/T 20126
Tensile test 1/batch GB/T 228
Plastic strain ratio (r) 1/batch GB/T 5027
Strain hardening exponent (n) 1/batch GB/T 5028
Surface roughness-
GB/T 2975
GB/T 2523
8.6 For tensile plastic strain ratio (r values) and strain hardening exponent (n - values), if a particular test result is not
Meet standard requirements, from the same batch and then either take double the number of samples that failed project reinspection. Retest results (for
The project includes all the required test indicators) qualified, then the whole batch is qualified. Retest results (including the required test project
All indicators) even if there is an indicator of failure, then retest failed. As retest failed, already a test and the test results
Substandard single piece can not be acceptance, but without making a single batch of material test piece by piece may resubmit testing and acceptance.
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9 packaging, marking and inspection documents
Steel sheet and strip packaging, marking and inspection documents shall comply with Q/BQB 400's. For a party to have special packaging weight
Special requirements should be specified in the contract.
10 numerical rounding rules
Numerical rounding rules should comply with GB/T 8170's.
Approximately 11 domestic and foreign brands control
The Standard Grade and Standard Grade abroad approximate comparison in Appendix A.
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Appendix A
(Informative)
Domestic and foreign brands approximation control
Table A.1 The approximate table Standard Grade and brands of domestic and international standards
Q/BQB 412-2009 BZJ412-2007 EN 10268.2006
HC220I
(B220IS)
B220IS HC220I
HC260I
(B260IS)
B260IS HC260I
Additional information.
The reference standard EN 10268.2006 establishment.
This standard replaces BZJ412-2007.
This standard BZJ412-2007 compared to major changes are as follows.
⎯ new grades HC220I and HC260I, and provides the corresponding chemical composition and mechanical properties;
⎯ r values measured by the strain of 16% to 15% strain;
⎯ increase in Appendix A.
Appendix A of this standard is an informative annex.
The standard proposed by Baoshan Iron & Steel Co., the Department of technical quality management.
This standard was drafted by the Baoshan Iron and Steel Co., the Department of technical quality management.
Drafters of this standard painted woods.
This standard is the first release.
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