GBT6723—XX通用冷弯开口型钢尺寸外形重量及允许偏差前言本标准与欧洲标准BSEN10162-2003《冷弯型钢技术交货条件—尺寸和截面公差》的一致性程度为修改，要紧差异如下：—适用范畴及截面形状分类不同；—提高了外形尺寸、表面质量考核要求。自本标准实施之日起代替GB/T6723-1986《通用冷弯开口型钢尺寸、外形、重量及承诺偏差》。本标准此次修订对下列技术内容进行了修改：—扩大产品规格范畴；—提高外形尺寸公差精度。本标准由中国钢铁工业协会提出。本标准由全国钢标准化技术委员会归口。本标准要紧起草单位：上海宝钢建筑工程设计研究院、武钢集团汉口轧钢厂、广州钢管厂、佛山市志达钢管制造、上海佳艺冷弯型钢厂。本标准要紧起草人：郁竑、马越峰、张秀芳、李烨、张永祺、李健彰、张静。本标准1986年8月首次公布。通用冷弯开口型钢尺寸、外形、重量及承诺偏差1范畴本标准适用于用可冷加工变形的冷轧或热轧钢带在连续辊式冷弯机组上生产的通用冷弯开口型钢。以下简称型钢。2分类、代号冷弯开口型钢按其截面形状分为8种，其代号为：2.1冷弯等边角钢（见图1）JD2.2冷弯不等边角钢（见图2）JB2.3冷弯等边槽钢（见图3）CD2.4冷弯不等边槽钢（见图4）CB2.5冷弯内卷边槽钢（见图5）CN2.6冷弯外卷边槽钢（见图6）CW2.7冷弯Z形钢（见图7）Z2.8冷弯卷边Z形钢（见图8）ZJ3截面尺寸及承诺偏差3.1型钢截面形状及标注符号分别如图1～图8所示，经双方协议，可供应表1～表8所列截面形状以外的冷弯开口型钢。3.2型钢的尺寸、截面面积、理论重量及要紧参数列于表1～表8。经双方协议，可供应表1～表8所列尺寸以外的冷弯开口型钢。图1冷弯等边角钢图2冷弯不等边角钢图3冷弯等边槽钢图4冷弯不等边槽钢图5冷弯内卷边槽钢图6冷弯外卷边槽钢图7冷弯Z型钢图8冷弯卷边Z型钢.表1冷弯等边角钢名称bxbxt20x20x1.220x20x2.030x30x1.630x30x2.030x30x3.040x40x1.640x40x2.040x40x3.050x50x2.050x50x3.050x50x4.060x60x2.060x60x3.060x60x4.070x70x3.070x70x4.080x80x4.080x80x5.0100x100x4.0100x100x5.0150x150x6.0150x150x8.0150x150x10200x200x6.0200x200x8.0200x200x10250x250x8.0250x250x10250x250x12300x300x10300x300x12300x300x14300x300x16300250200150708010060504030尺寸mmb20t1.22.01.62.03.01.62.03.02.03.04.02.03.04.03.04.04.05.04.05.06.08.0106.08.0108.0101210121416理论重量kg/m0.3540.5660.7140.8801.2740.9651.1941.7451.5082.2162.8941.8222.6873.5223.1584.1504.7785.8956.0347.46513.45817.68521.78318.13823.92529.58330.16437.38344.47245.18353.83262.02270.312截面面积cm20.4510.7210.9091.1211.6231.2291.5212.2231.9212.8233.6862.3213.4234.4864.0235.2866.0867.5107.6869.51017.25422.67327.92723.25430.67337.92738.67247.92757.01557.92769.01579.51690.144重心cmY00.5590.5990.8290.8490.8981.0791.0991.1481.3491.3981.4481.5991.6481.6981.8981.9482.1982.2472.6982.7474.0624.1694.2775.3105.4165.5226.6646.7706.8768.0188.1248.2778.392差不多尺寸与要紧参数惯性矩cm4Ix=Iy0.1790.2780.8170.9981.4091.9852.4383.4964.8487.0159.0228.47812.34215.97019.85325.79939.00947.67777.57195.237391.442508.593619.211945.75291237.1491516.7872453.5593020.3843568.8365286.2526263.0697182.2568095.516Iu0.2920.4571.3281.6262.3163.2133.9565.7107.84511.41414.75513.69420.02826.03032.15241.94463.29977.622125.528154.539635.468830.2071016.6381529.3282008.3932472.4713970.5804903.3045812.6128559.13810167.4911740.0013279.70Iv0.0660.0990.3070.3690.5030.7580.9191.2821.8502.6163.2903.2624.6575.9117.5539.65414.71917.73129.61335.335147.415186.979221.785362.177465.905561.104936.5381137.4641325.0612020.3672358.6452624.5022911.336rx=ry0.6300.6210.9480.9430.9311.2701.2651.2531.5881.5761.5641.9101.8981.8862.2212.2092.5312.5193.1763.1644.7634.7364.7096.3776.3516.3247.9657.9397.9129.5539.5269.5049.477回转半径cmru0.8040.7961.2081.20...
