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中华人民共和国国家标准UDC669.14-418冷轧钢板和钢带的尺寸、外形、重量GB708-88及允许偏差代替GB708-65Dimensions´shape´weightandtolerancesforcold-rolledplatesandsheets本标准适用于宽度大于或等于600mm,厚度为0.2~5mm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窄钢带。1分类和代号1.1按边缘状态分切边Q不切边BQ1.2按轧制精度分较高精度A普通精度B2定义2.1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。2.2钢带是指成卷交货,宽度不小于600mm的宽钢带。3尺寸3.1钢板和钢带的厚度、宽度及钢板的长度应符合表1的规定。3.2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。3.3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4.1钢板和钢带的厚度允许偏差应符合表2的规定。4.1.1钢带焊缝处20m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%。4.1.2钢带两端总长度30m内厚度偏差允许比表2规定值超出50%。中华人民共和国冶金工业部1988-02-151989-07-01实施第1页共5页GB708-88第2页共5页表1mm按下列钢板宽度的昀小和昀大长度公称厚度600650700(710)7508008509009501000110012501400(1420)1500160017001800190020000.200.250.300.350.400.451200250013002500140025001400250015002500150025001500250015003000150030001500300015003000—————————0.560.600.65120025001300250014002500140025001500250015002500150025001500300015003000150030001500300015003500————————0.700.751200250013002500140025001400250015002500150025001500250015003000150030001500300015003000150035002000400020004000——————0.800.901.00120030001300300014003000140030001500300015003000150030001500350015003500150035001500350015004000200040002000400020004000—————1.11.21.3120030001300300014003000140030001500300015003000150030001500350015003500150035001500350015004000200040002000400020004000200040002000420020004200——1.41.51.61.71.82.0120030001300300014003000140030001500300015003000150030001500300015003000150040001500400015006000200060002000600020006000200060002000600025006000——2.22.512003000130030001400300014003000150030001500300015003000150030001500300015004000150040002000600020006000200060002000600020006000250060002500600025006000250060002.83.03.212003000130030001400300014003000150030001500300015003000150030001500300015004000150040002000600020006000200060002000600020002750250027502500275025002750250027503.53.83.9———————————2000450020004500200045002000475020002750250027502500270025002700250027004.04.24.5———————————2000450020004500200045002000450015002500150025001500250015002500150025004.85.0———————————200045002000450020004500200045001500230015002300150023001500230015002300GB708-88第3页共5页表2mm厚度允许偏差A级精度B级精度公公称称宽厚度度≤1500>1500~2000≤1500>1500~20000.20~0.50>0.50~0.65>0.65~0.90>0.90~1.10>1.10~1.20>1.20~1.4>1.4~1.5>1.5~1.8>1.8~2.0>2.0~2.5>2.5~3.0>3.0~3.5>3.5~4.0>4.0~5.0±0.04±0.05±0.06±0.07±0.09±0.10±0.11±0.12±0.13±0.14±0.16±0.18±0.19±0.20———±0.09±0.10±0.12±0.13±0.14±0.15±0.17±0.19±0.20±0.21±0.22±0.05±0.06±0.07±0.09±0.10±0.11±0.12±0.14±0.15±0.16±0.18±0.20±0.22±0.23———±0.11±0.12±0.14±0.15±0.16±0.17±0.18±0.20±0.21±0.24±0.254.2宽度允许偏差4.2.1钢板和钢带的宽度允许偏差应符合表3的规定。表3mm公称宽度宽度允许偏差≤1000+6>1000+10不剪纵边的钢带+154.2.2纵切钢带的宽度允许偏差应符合表4的规定。表4mm宽度允许偏差公公称称宽厚度度≤125>125~250>250~400>400~<6000.20~0.40+0.3+0.6+1.0+1.5>0.40~1.0+0.5+0.8+1.2+1.5>1.0~1.8+0.7+1.0+1.5+2.0>1.8~3.0+1.0+1.3+1.7+2.04.2.3钢板的长度允许偏差应符合表5的规定。GB708-88第4页共5页表5mm公称长度长度允许偏差≤2000+10>2000+155外形5.1钢板和钢带每米的不平度符合表6的规定。表6mm不平度公称厚度公称宽度≤0.70>0.70~1.50>1.50~5.0≤1000>1000~1500>1500~20001012188101568125.1.1表6所列的不平度适用于抗拉强度δb下限不大于485N/mm²(50kgf/mm²)的钢板和钢带,对于抗拉强度δb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昀大值允许比表6规定值增加30%。对于抗拉强度δb的下限大于585N/mm²(60kgf/mm²)的钢板和钢带的不平度昀大值允许比表6规定值提高50%。5.2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。5.3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昀小钜形。5.4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6mm公称厚度公称宽度塔形高度≤2.5≤1000>10004060>2.5≤1000>100030505.4.1钢带卷的内径应在合同中注明。5.5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6.1钢板厚度:在距离边部不小于40mm处测量。6.2钢带厚度:在距离边缘不小于40mm处测量。6.3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,不施加任何压力,用米尺进行测量,测量钢板与米尺之间的昀大距离。GB708-886.4钢板和钢带的镰刀弯:将米尺紧靠钢板的凹侧边,测量从米尺到凹侧边的昀大距离。7重量钢板和钢带按实际重量或理论重量交货。理论重量计算钢的密度,碳素钢为7.85g/cm³。其他钢种按相应标准的规定。标记举例:牌号20,尺寸1.0mm×1000mm×1500mm,表面质量组别Ⅱ,拉延级别S级的标记为:钢板1.0×1000×1500-GB708—8820-Ⅱ-S-GB710—88附加说明:本标准由冶金工业部情报标准研究所总所、鞍山钢铁公司负责起草。本标准主要起草人王丽敏、唐一凡、王惠范。第5页共5页
本文标题:GB708-88冷轧钢板和钢带的尺寸、外形、重量[1]
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