Q/BQB 495-2014 English PDF (QBQB495-2014)
Q/BQB 495-2014 English PDF (QBQB495-2014)
See Chinese contents: Q/BQB 495-2014
Q/BQB 495-2014: Cold rolled steel strip for battery case
Supply Technical Conditions of Baoshan Iron and Steel Co., Ltd.
Cold-rolled steel strips for battery cases
Replacing BZJ 495-2008
This Technical Conditions specifies the classification and code, dimension, shape, weight, technical requirements, inspection and test, packaging, marking and inspection documents of cold-rolled steel strips for battery cases. This Technical Conditions applies to cold-rolled steel strips for battery cases with a thickness of 0.25 mm ~ 0.50 mm produced by Baoshan Iron and Steel Co., Ltd. (hereinafter referred to as steel strips).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 222-2006 Permissible tolerances for chemical composition of steel
GB/T 223 Methods for chemical analysis of iron, steel and alloy
GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1. Method of test at room temperature
GB/T 230.1-2009 Metallic materials - Rockwell hardness test - Part 1. Test method (scales A, B, C, D, E, F, G, H, K, N, T)
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 4336-2002 Standard test method for spark discharge atomic emission - Spectrometric analysis of carbon and low-alloy steel (routine method) GB/T 8170-2008 Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 20066-2006 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
GB/T 20123-2006 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction
furnace (routine method)
GB/T 20125-2006 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
GB/T 20126-2006 Unalloyed steel - Determination of low carbon content - Part 2. Infrared absorption method after combustion in an induction furnace (with preheating)
Q/BQB 400 Packaging, marking and inspection documents for cold rolled
Q/BQB 401 Dimension, shape, weight and tolerances of cold-rolled steel
plates and steel strips
JIS Z2241.2011 Metallic materials - Tensile testing - Method of test at room temperature
3 Classification and code
3.1 The use and code of steel strips shall comply with the requirements of Table 1.
BDCK For battery cases
3.2 The classification of steel strips according to surface quality shall comply marks generated during the handling, storage and use of non-oiled products. NOTE. The date of issue in the product inspection document is usually specified as the date of completion of the manufacture of the product.
6.4 Mechanical properties
6.4.1 The supply party shall ensure that the mechanical and process properties of steel strips comply with the requirements of Table 6 within 6 months from the date of completion of the manufacture.
6.4.2 When steel strips are supplied as the specified parts, the supply and demand parties may agree on a range of mechanical properties that meet the processing needs of the part as the acceptance criteria. At this time, the mechanical properties specified in Table 6 will no longer be used as the basis for delivery and acceptance.
6.4.3 Due to the influence of aging, the mechanical properties of steel strips will deteriorate with the prolongation of storage time, such as the increase of yield strength and tensile strength, the decrease of elongation after break, formability deteriorates, tensile strain marks appear, etc. It is recommended that users use it as soon as possible.
HRB Yield strength
Elongation after break
not less than
Nominal thickness mm Nominal thickness mm
0.25 ~ 0.30 > 0.30 0.25 ~ 0.30 > 0.30
BDCK 180 ~ 300 300 ~ 390 33 34 40 ~ 60 40 ~ 52
a RP0.2 is used when the yielding phenomenon is not obvious, otherwise ReL is used. b The specimen is the No. 5 specimen specified in JIS Z2241, and the direction of the specimen is longitudinal.
6.5 Surface quality
6.5.1 There shall be no defects that are harmful to the use, such as holes, surface cracks, laminations, on the surface of steel strips.
6.5.2 The characteristics of surface quality level of steel strips shall comply with the requirements of Table 7.
acceptance testing. In the event of a dispute, the test shall be carried out using the inspection and test methods specified in this Technical Conditions and the relevant technical requirements.
method Test method
analysis 1/furnace GB/T 20066
GB/T 223, GB/T 4336,
GB/T 20123, GB/T 20125, GB/T 20126
Tensile test 1
Method B in GB/T 228.1
Hardness 1 GB/T 230.1
roughness 1/coil GB/T 2523
7.7 For the tensile, hardness and roughness tests, if the test result of one item does not meet the technical requirements, then take double the quantity of specimens from the same batch for the re-inspection of the unqualified item. If the re-inspection result (including all the indicators required for the test of this item) is qualified, the whole batch is qualified. For the re-inspection result (including all the indicators required for the test of this item), even if one of the indicators is unqualified, the re-inspection is unqualified. If the re-inspection is unqualified, the single piece of product that has been tested and the test result is unqualified cannot be accepted, but the single piece of product in the batch that has not been tested can be resubmitted one by one for test and acceptance. 9 Packaging, marking and inspection documents
The packaging, marking and inspection documents for steel strips shall comply with the requirements of Q/BQB 400. If the demand party has special
requirements for packaging mass, they shall be indicated in the contract. 10 Rules of rounding off for numerical values
The rules of rounding off for numerical values shall comply with the
requirements of GB/T 8170.