冷轧钢板和钢带的尺寸.doc

冷轧钢板和钢带的尺寸、外形、重量及允许偏差 GB 708-88责任编辑：华文 来源：成都钢铁网 2008年06月22日 冷轧钢板和钢带的尺寸、外形、重量及允许偏差 GB708-88本标准适用于宽度大于或等于600mm，厚度为O.25mm的冷轧钢板和厚度不大于3mm的冷轧钢带。不适用于直接轧制宽度小于600mm的窄钢带。1分类和代号11按边缘状态分切边 Q不切边 BQ12按轧制精度分较高精度A普通精度B2定义21钢板是平板状，矩形的，可直接轧制或用大于600mm宽钢带剪切而成。22钢带是指成卷交货，宽度不小于600mm的宽钢带。3尺寸31钢板和钢带的厚度、宽度及钢板的长度应符合表1的规定。32钢板和钢带的宽度也可为10mm倍数的任何倍尺，钢板长度为50mm倍数的任何倍尺。33根据需方要求，经供需双方协商，可以供应其他尺寸的钢板和钢带。4尺寸允许偏差41钢板和钢带的厚度允许偏差应符合表2的规定。411钢带焊缝处20mm范围内的厚度允许偏差，当钢带厚度1.5mm时，比表2规定值增加100%，当钢带厚度1.5mm时，增加60%。412钢带两端总长度30m内厚度偏差允许比表2规定值超出50%。表1公称厚度/mm按下列钢板宽度的最小和最大长度/mm600650700(710)75080085090095010000.20、0.25、0.30、0.35、0.40、0.45120025001300250014002500140025001500250015002500150030001500300015003000150030000.55、0.60、0.65120025001300250014002500140025001500250015002500150025001500300015003000150030000.70、0.75120025001300250014002500140025001500250015002500150025001500300015003000150030000.80、0.90、1.00120030001300300014003000140030001500300015003000150030001500350015003500150035001.1、1.2、1.3120030001300300014003000140030001500300015003000150030001500350015003500150035001.4、1.5、1.6、1.7、1.8、2.0120030001300300014003000140030001500300015003000150030001500300015003000150040002.2、2.5120030001300300014003000140030001500300015003000150030001500300015003000150040002.8、3.0、3.2120030001300300014003000140030001500300015003000150030001500300015003000150040003.5、3.8、3.94.0、4.2、4.54.8、5.00.20、0.25、0.30、0.35、0.40、0.45150030000.55、0.60、0.6515003000150035000.70、0.75150030001500350020004000200040000.80、0.90、1.0015003500150040001500400020004000200040001.1、1.2、1.315003500150040002000400020004000200040002000400020004200200042001.4、1.5、1.6、1.7、1.8、2.015004000150060002000600020006000200060002000600020006000250060002.2、2.5150040002000600020006000200060002000600020006000250060002500600025006000250060002.8、3.0、3.2150040002000600020006000200060002000600020002750250027502500270025002700250027003.5、3.8、3.92000450020004500200045002000475020002750250027502500270025002700250027004.0、4.2、4.52000450020004500200045002000450015002500150025001500250015002500150025004.8、5.0200045002000450020004500200045001500230015002300150023001500230015002300表2公称厚度/mm公称厚度/mm厚度允许偏差/mmA级精度B级精度1500150020001500150020000.200.500.040.050.500.650.050.060.650.900.060.070.901.000.070.090.090.111.101.200.09士0.100.100.121.201.4士0.100.120.110.141.41.5土0.110.130.120.151.51.80.120.140.14士0.161.82.00.130.150.150.172.02.5士0.14士0.17士0.16士0.182.53.00.16士0.190.180.203.03.50.180.200.200.213.54.00.190.210.220.244.05.00.200.220.230.2542宽度允许偏差421钢板和钢带的宽度允许偏差应符合表3的规定。表3公称宽度/mm宽度允许偏差/mm1000+61000+10不剪纵边的钢带+15422纵切钢带的宽度允许偏差应符合表4的规定。表4公称厚度/mm公称厚度/mm宽度允许偏差/mm1251252502504004000.401.0+0.5+0.8+1.2+1.51.01.8+0.7+1.0+1.5+2.01.83.0+1.0+1.3+1.7+2.0423钢板的长度允许偏差应符合表5的规定。表5公称长度/mm20002000允许偏差/mm+10+155外形51钢板和钢带每米的不平度应符合表6的规定。表6公称厚度公称宽度塔形高度2.51000100040602.5100010003050511表6所列的不平度适用于抗拉强度db下限不大于485N/mm2(50kgf/mm2)的钢板和钢带，对于抗拉强度b的下限大于485N/mm2(50kgf/mm2)，但不大于585N/mm2(60kgf/mm2)的钢板和钢带不平度的最大值允许比表6规定值增加30%。对于抗拉强度吼的下限大于585N/mm2(60kgf/mm2)的钢板和钢带的不平度最大值允许比表6规定值提高50%。52钢带的镰刀弯在每2m内不大于6mm，纵切钢带的镰刀弯每2m内不大于4mm。53钢板应切成直角，切斜不得使钢板长度和宽度小于公称尺寸，并须保证订货公称尺寸的最小矩形。54钢带应牢固地成卷，钢带卷的一侧塔形高度不得超过表7的规定。表7钢板和钢带每米的平面度公称宽度/mm平面度(mm/m)0.700.701.501.505.010001086100015001210815002000181512541钢带卷的内径应在合同中注明。55根据供需双方协商，钢板的同板差不得大于厚度公差之半。6尺寸测量61钢板厚度：在距离边部不小于40mm处测量。62钢板厚度：在距离边缘不小于40mm处测量。63钢板的不平度：将钢板自由地放在平台上，除钢板的本身重量外，不施加任