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High-strength Cold Rolled Steel Plate and Strip
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Q/BQB 411-2009
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PDF similar to Q/BQB 411-2009
Basic data | Standard_ID | Q/BQB 411-2009 (Q/BQB411-2009; QBQB 411-2009; QBQB411-2009) | | Description (Translated English) | 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 411-2009: 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.
High-strength Cold Rolled Steel Plate and Strip
Baoshan Iron & Steel Co., Ltd. Enterprise Standard
Phosphorus plus cold rolled high strength steel sheet and strip
Partial replacement of Q/BQB 411-2003
1 Scope
This standard specifies the terms and definitions plus phosphorus cold rolled high strength steel sheet and strip, classification and code, size, shape, weight,
Technical requirements, inspection and testing, packaging, marking and inspection documents.
This standard applies to the thickness of Baoshan Iron & Steel Co., Ltd. production of 0.50mm ~ 2.5mm cold plus phosphorus high strength even
Rolled 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
GB/T 20123-2006 Steel - Determination of total carbon and sulfur content of the high-frequency induction furnace combustion infrared absorption method (often
Conventional methods)
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 plus phosphorus high strength steel rephosphorized steels (P)
In the ultra-low carbon steel or low carbon steel, mainly by adding a maximum of 0.12% of phosphorus and other solid solution strengthening elements to improve the steel strong
degree. This steel has high strength and good cold formability, and have good impact resistance and fatigue resistance, usually used
Car cover and structural parts production.
4 Classification and designation
4.1 steel sheet and strip by use distinction should meet the requirements of Table 1.
Table 1
Trademark use
HC180P
B180P2
General use
HC220P
B220P2
HC260P
HC300P
Structures
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 2009-06-30 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
Steel sheet and strip size, shape, weight and tolerances shall comply with the provisions of Q/BQB 401's.
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) Grade
C Mn PS Alt
B180P2 ≤0.08 ≤0.80 ≤0.12 ≤0.025 ≥0.015
B220P2 ≤0.10 ≤1.00 ≤0.12 ≤0.025 ≥0.015
HC180P ≤0.05 ≤0.60 ≤0.08 ≤0.025 ≥0.015
HC220P ≤0.07 ≤0.70 ≤0.08 ≤0.025 ≥0.015
HC260P ≤0.08 ≤0.70 ≤0.10 ≤0.025 ≥0.015
HC300P ≤0.10 ≤0.70 ≤0.12 ≤0.025 ≥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
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use.
table 5
Tensile tests a, b, c
Grade Yield Strength
MPa
tensile strength
MPa
The Elongation
A80mm
% not less than
r90 d
not less than
n90
not less than
B180P2 180 ~ 280 340 30 - -
B220P2 220 ~ 320 380 28 - -
HC180P 180 ~ 230 280 ~ 360 34 1.6 0.17
HC220P 220 ~ 270 320 ~ 400 32 1.3 0.16
HC260P 260 ~ 320 360 ~ 440 29 - -
HC300P 300 ~ 360 400 ~ 480 26 - -
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%.
When the thickness d is greater than 2.0 mm, r90 allow reduced 0.2.
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
More advanced surface finishing FB surface allows a small amount does not affect the moldability and coating, plating adhesion defects, such as minor scratches, indentation, pitting, roll mark and oxidation tint like.
FC advanced surface finishing products in two faces better side no visible obvious defect, the other side must reach at least the requirements of FB.
Premium surface finishing FD products in two faces better side without any defect, that can not affect the appearance of the quality of appearance quality after painting or after plating, the other side must reach at least the requirements of 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 20066 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 (n) 1/batch GB/T 5027
Strain hardening exponent (n) 1/batch GB/T 5028
Surface roughness-
GB/T 2975
GB/T 2523
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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.
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)
The Standard Grade and Standard Grade abroad approximate table
Table A.1
B180P2 - JSC340W B180P2
B220P2 - JSC390W B220P2
HC180P HC180P - -
HC220P HC220P - -
HC260P HC260P - -
HC300P HC300P - -
Additional information.
The reference standard EN 10268.2006, JFS A 2001.1998 establishment.
The partial replacement of standard Q/BQB 411-2003.
This standard is compared with Q/BQB 411-2003, the main changes are as follows.
⎯ new grades HC180P, HC220P, HC260P, HC300P, and a corresponding increase in the technical content;
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 was first published in 2003, this is the first revision.
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