Q.BQB.403标准（英文版）.doc

Cold rolled low carbon steel plate and strip(Q/BQB 403-2003 replacing Q/BQB 403-1999 BZJ 407-1999)1 ScopeThis standard stipulates classification and code, dimension, shape, weight, technical requirement, inspection and test, packaging, identification and certificate of quality ect. of cold rolled low carbon steel plate and strip.This standard is applicable to cold rolled low carbon steel plate and strip (0.30mm3.5mm thick) (hereinafter refer to steel plate and steel strip) produced by Baoshan Steel Co. Ltd.2 Normative referenceThe clauses in following documentations become clauses of this standard because they are quoted. For quoted dated documentations, its follow-up modified sheet (excluding corrigenda) or modified version are not applicable to this standard, however, its encouraged that parties who reach an agreement according to this standard discuss if latest versions of these documentations can be used. For those undated, their latest versions are applicable to this standard.GB/T 222-1984Sampling method of test samples for steel chemical analysis and permissible error of chemical ingredient in finished productGB/T 223Chemical analysis method of steel and alloyGB/T 228-2002Test method of metal material tension at ambient temperatureGB/T 2975-1998Sampling position and sample preparation of mechanics performance test of steel and steel product GB/T 5027-1999Test method of plastic strain ratio of thin metal plate and stripGB/T 5028-1999Test method of tensile stain hardening index of thin metal plate and stripGB/T 8170-1987Rules for rounding offQ/BQB 400-2003Packaging, identification and certificate of quality of cold rolling productsQ/BQB 401-2003Dimension, shape, weight and permissible error of cold rolling steel plate and stripSAE J911-1998Measurement method of surface roughness and peak of cold rolling steel plate3 Classification and code3.1 Steel plate and steel strip are distinguished as per purpose as shown in table 1.Table 1Sign Purpose DC01 (St12) General useDC03 (St13) For pressingDC04(St14, St15) For deep pressingDC05 (BSC2) Very deep pressingDC06 (St16, St14-T, BSC3) Ultra-deep pressingNote: Sign in the bracket can be used until the end of 2005.Table 2Level CodeLess senior finishing surface FB (03)Senior finishing surface FC (04)Ultra-senior finishing surface FD (05)Table 3Surface structure CodeTextured surface DLucent surface B4 Information required when ordering goods4.1 The customer shall provide with following information when ordering goods:a) Product nameb) Standard No. of this productc) Signd) Specification and size and roughness precisione) Edge statusf) Surface structureg) Quality level of surfaceh) Packaging methodi) Purpose4.2 If size, roughness precision, surface structure, quality level of surface, edge status and packaging method are not indicated in the order contract, edge-sheared steel strip and edge-sheared steel plate with ordinary size and roughness, textured surface, surface quality of FB level will be supplied, and packed as per packaging method the supplier proposed.5 Dimension, shape, weight and permissible errorDimension, shape, weight and permissible error of steel plate and steel strip must meet the provision of Q/BQB 401.6 Technical requirement6.1 Chemical ingredient6.1.1 Chemical ingredient of steel (melting analysis) should be in accordance with the provision of table 4.Table 4SignChemical ingredient %CMnPSAltaTibDC01 (St12)0.100.500.0350.0250.020-DC03 (St13)0.080.450.0300.0250.020-DC04 (St14, St15)0.080.400.0250.0200.020-DC05 (BSC2)0.0080.300.0200.0200.0150.20DC06(St16, St14-T, BSC3)0.0060.300.0200.0200.0150.20a For sign DCO1, DC03 and DC04, when C0.01, A1t0.015. b Part of Ti can be replaced by Nb, at this time total contents of Nb and Ti0.02.6.1.2 Permissible error of chemical ingredient of steel plate and steel strip finished product should be in accordance with the provision of GB/T 222.6.2 Steelmaking methodOxygen converter steelmaking is adopted for the steel of steel plate and strip.6.3 Delivery status6.3.1 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 should be able to be removed with alkaline aqueous solutions. The supplier guarantees that products will not rust in 6 months since the date of manufacturing under the condition of non-naked package, normal transportation, loading and unloading and storage. If the supplier and the demander reach an agreement and note it in the contract, products can be delivered without oiling as the demander requires,6.3.3 Mechanics performanceMechanics performance of steel plate and strip should be in accordance with the provision of table 5.Table 5 Elongation rate after breakage (L=80mm, b=20mm)%SignYield strengtha MpaTensile strength Mpa No less than No less thannominal thickness mmValueb,c no less thanValueb,c no less than 0.70 0.701.0 1.01.6 1.6DC01 (St12)13026027028303234-DC03 (St13)12024027032343536-DC04 (St14, St15)120240270363839401.50.18DC05 (BSC2)110190260383940411.80.20DC06 (St16, St14-T, BSC 3)100180250394041422.00.22a Adopt RP0.2 when yield is not clear, otherwise adopt ReL. b for sign DC04, value is sum; for sign DC05 and DC06, value is sum. When thickness1.6mm, value can be below 0.2; when thickness2.0, value is uncertain. C=(+2+)/4;=(+2+)/4.6.5 Tensile strain markThe provision about tensile strain mark of steel plate and strip is as shown in table 6.Table 6Sign Tensile Strain MarkDC01 (St12) Steel plate and strip are stored at ambient temperature. It should be guaranteed that there will be no tensile strain mark when used within three months after the production.DC04 (St14, St15) Steel plate and strip are stored at ambient temperature. It should be guaranteed that there will be no tensile strain mark when used within three months after the production.DC05 (BSC2) Steel plate and strip are stored at ambient temperature. It should be guaranteed that there will be no tensile strain mark when used.DC06 (St16, St14-T, BSC3) Steel plate and strip are stored at ambient temperature. It should be guaranteed that there will be no tensile strain mark when used.6.6 surface quality6.6.1 Steel plate and strip should be no defects on surface bad for usage such as scar, crack and impurities and no lamination.6.6.2 Characteristics of surface quality level of steel plate and strip are as indicated in table 7.6.6.3 For steel strip, there is no chance to cut the defective part, so its allowed to deliver with defects, but defective part should not exceed 6% of overall length.Table 7LevelCodeCharacteristicsLess senior finishing surfaceFB (03)The surface is permissible to have defects which dont affect molding, painting and galvanization, e.g. small scuffing, press mark, dot, roller mark and oxidation color.Senior finishing surfaceFC (04)There is no visible defect by naked eyes on the better side of the product, and the other side must at least meet the requirement of FB.Ultra-senior finishing surfaceFD (05)There should be no defects on the better side of the product, i.e. it should not affect the appearance quality after painting or galvanizing; the other side must at least meet the requirement of FB.6.7 Surface structureWhen surface structure is textual (D), average roughness Ra shall be controlled 0.6mRa1.9m; when surface structure is lucent (B), average roughness Ra shall be controlled Ra0.9.7 Inspection and test7.1 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 proper meters.7.3 Value is obtained when 16% strain; n value is obtained within 10%20% strain range; when even tensile rate is less than 20%, strain range is from 10% to the end of even tension.7.4 Inspection item, number of test sample, sampling method, test method and sampling direction of each batch of steel plate and strip should be in accordance with the provision of table 8.Table 8No.Inspection itemNumber of test samples (unit)Sampling methodTest methodSampling direction1Chemical analysis1/ovenGB/T 222GB/T 223-2Tension test1GB/T 2975GB/T 228Traverse sample3Plastic strain ratio (value)1 or 3GB/T 2975GB/T 5027-4Strain hardening index (value)1 or 3GB/T 2975GB/T 5028-5Surface roughness-GB/T 2975 SAE J911-Note: one test sample, three test samples7.5 Steel plate and strip should be accepted by batch. Each inspection batch shall be composed of no more than 30t of steel plate and strip with same sign, same specification and same process status. 7.6 For tensile test, plastic strain ratio (value) test and strain hardening index (value) test, if any test result is not in accordance with standard requirement, take double quantity of test samples from the same batch to reinspect this item. If reinspection result is ok (including all indicators required by the test on this item), the whole batch are qualified products, otherwise, reinspection is not qualified. If so, single piece which has been tested to be unqualified shall be unacceptable, but single piece which hasnt been tested can be submitted one by one for test and acceptance newly. 8 packaging, identification and certificate of qualityPackaging, identification and certificate of quality of steel plate and strip should be in accordance with the provision of Q/BQB 400. If the demander has special requirement for packaging weight, it should be indicated in the contract.9 Rules of rounding offRules of rounding off should be in accordance with the provision of GB/T 8170.Appendix A(Informative appendix)Comparison list of similar signs in this standard, adopted standard and relevant standardTable A.1Standard No.Q/BQB 403-2003EN10130-1999EN10130-1991DIN1623-(1)-1983GB/T5213-2001Q/BQB 403-1999 BZJ407-1999DC01 (St12)DC01FeP01St12-St12DC03(St13)DC03FeP03RRSt13-St13SignsDC04 (St14, St15)DC04FeP04St14SC1St14, St14F, St14HF,St14ZF, St15DC05 (BSC2)DC05FeP05-SC2BSC2DC06 (St16, St14-t, BSC3)DC06FeP06-SC3St16, St14-T, BSC3Additional explanation:Consistency of this standard and EN 10130-1999 is nonequivalent.This standard will replace Q/BQB 403-1999 and BZJ 407-1999.This standard has changes as follows, compared with Q/BQB 403-1999: Makes modification and integration to signs; Surface quality level is changed from two to three; Surface structure is chang