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1、冷连轧碳素钢板及钢带 标准（Standard for cold rolled carbon steel sheet and strip）Cold rolled carbon steel sheet and strip(Q/BQB 4022003 instead of Q/BQB 402-1999)1 rangeThis standard specifies the classification and code name, size, shape, weight, technical requirements, inspection and test, packing, marking and
2、 quality certificate of carbon steel sheets and strips for cold rolling.This standard applies to the cold rolled carbon steel plate and steel strip of the thickness of 0.30mm 3.5mm produced by Baoshan Iron Steel Co (hereinafter referred to as steel plate and steel strip).2 normative reference docume
3、ntsThe terms in the following documents are referenced by this standard and become the provisions of this standard. Fordated documents, subsequent amendments (excluding corrections) or revisions do not apply to this standard, however, encourage the latest version of the parties to agreements based o
4、n this standard using these files. Any undated reference document whose latest edition is applicable to this standard.Chemical analysis of GB/T 2221984 sampling steel method and refined chemical composition allowable deviationGB/T 223 methods for chemical analysis of iron, steel and alloyTest method
5、 for room temperature tensile testing of GB/T 228-2002 metal materialsGB/T 2301991 metal Rockwell hardness test methodTest method for bending of GB/T 2321999 metal materialsGB/T 29751998 steel and steel products mechanical performance test sampling position and sample preparationVivtorinox GB/T 4340
6、.11999 metal hardness test - part first: Test methodsGB/T 81701987 roundingPacking, marking and quality certification of Q/BQB 4002003 cold rolled productsQ/BQB 4012003 cold rolling steel plate and strip size, shape, weight and tolerancesThe measurement method of SAE J9111998 cold-rolled steel plate
7、 and the surface roughness and peak number3 Classification and designation3.1 steel plates and steel belts are to be differentiated by use, as specified in table 1.Table 1Brand useSPCC is generally usedSPCD stampingSPCE and SPCEN deep drawing3.2 the steel plate and the steel strip are distinguished
8、according to the surface quality, as specified in table 2.Table 2Class codeThe higher finishing surface is FB (O3)Advanced finishing surface FC (O4)Ultra high finishing surface FD (O5)3.3 the steel plate and the steel strip are distinguished by the surface structure as specified in table 3.Table 3Su
9、rface structure codeMa DBright surface B3.4 steel plate and steel strip are classified according to heat treatment type, as specified in table 4.Table 4Heat treatment type codeAnnealing and leveling S1/8 hard 81/4 hard 4Rigid 14 information required for ordering4.1 when ordering, the user shall prov
10、ide the following information:A) product name (steel plate or strip)(b) the standard number of this productC) brand(d) product specification and size, unevenness accuracyE) edge statesF) types of heat treatment(g) surface structure(H) surface quality gradeI) packing methodsJ) use4.2 if the contract
11、does not specify the size and roughness of precision, heat treatment, surface structure, surface quality level, edge and packing, the standard products according to the average size and roughness accuracy, types of heat treatment for annealing and flat surface, structure of pits, FB surface quality
12、of cutting edge strip and the trimming plate supply, packing and packaging supplier provided by.5 size, shape, weight and allowable deviationSteel sheet and strip size, shape, weight and tolerances according to the provisions of Q/BQB 401, SPCC, SPCD thickness, roughness deviation should be allowed
13、to meet Q/BQB 401 specified minimum yield strength of 280MPa when the corresponding provisions.6 technical requirements6.1 chemical compositionThe chemical composition (melting analysis) of 6.1.1 steel shall conform to the provisions of table 5.Table 5Brand chemical composition%C, Mn, P, S, AltaSPCC
14、 = 0.12 = 0.50 = 0.035 = 0.025 = 0.020SPCD = 0.10 = 0.45 = 0.030 = 0.025 = 0.020SPCE, SPCEN = 0.08 = 0.40 = 0.025 = 0.020 = 0.020A for all grades when C = 0.01, Alt = 0.015.The allowable deviation of the chemical composition of 6.1.2 steel plate and steel strip shall comply with the provisions of GB
15、/T 222.6.1.3 when producing 1/8 hard, 1/4 hard and hard steel plate and steel strip, it can exceed the chemical composition shown in table 5.6.2 smelting methodThe steel used for steel and steel strips is smelted by oxygen converter.6.3 delivery status6.3.1 steel plate and steel strip are supplied by heat treatment after cold continuous rolling, and the heat treatment type is shown in table 4.6.3.2 steel and steel belts are usually supplied by oil, and the coating shall be removed with alka
