结构用冷弯空心型钢(GBT6728-1986)

结构用冷弯空心型钢(GB/T6728—1986)尺寸规格见表1一表3表1 方形空心钢的尺寸规格A—边长t一壁厚R—外圆弧半径边长/mm尺寸允许偏差/mm壁厚t/mm理论质量/(kg/m)截面面积/cm2边长/mm尺寸允许偏差壁厚t/mm理论质量/(kg/m)截面面积/cm2A普通精度较高精度A普通精度较高精度1.20.8671.1053.07.0719.0081.51.0611.35280±1.40±0.704.09.22211.747251.751.2151.5485.011.20914.356±0.60±0.302.01.3631.7363.08.01310.2082.52.0322.5894.010.47813.347303.02.3613.00890±1.50±0.755.012.83916.3562.52.8173.5896.015.09719.2324.011.73414.94740±0.80±0.403.03.3034.208100±1.60±0.805.014.40918.3564.04.1985.3476.016.98121.6322.53.6024.5894.014.24618.1475.017.54922.35650±1.00±0.503.04.2455.408120±1.80±0.906.020.74926.4324.05.4546.947&026.84034.1912.54.3875.5894.016.75821.3473.05.1876.6085.020.68926.35660±1.20±0.604.06.7108.547140±2.00±1.006.0&024.51731.86431.23240.5915.08.12910.3564.019.27024.5473.06.1297.808160±2.40±1.205.023.82930.356704.07.96610.1476.028.28536.0325.09.69912.356&036.88846.99l表2矩形空心钢的尺寸规格A—长边B—短边t一壁厚R—外圆弧半径边长/mm尺寸允许偏差/mm壁厚t/mm理论质量/(kg/m)截面面积/cm2AB普通精度较高精度5025±1.00±0.501.21.3381.7051.51.6502.102302.52.8173.5893.03.3034.2084.04.1985.34760±1.20±0.602.53.2094.0893.03.7744.8084.04.8266.147402.53.6024.5893.04.2455.4084.05.4546.94770503.05.1876.6084.06.7108.5475.0&12910.3568040±1.40±0.702.54.3875.5893.05.1876.6084.06.7108.5475.0&12910.356603.06.1297.8084.07.96610.1475.09.69912.3569040±1.50±0.753.05.6587.2084.07.3389.3475.0&91411.356503.06.1297.8084.07.96610.1475.09.69912.356603.06.6008.4084.0&59410.9475.010.48413.356

10050±1.60±0.803.06.6008.4084.0&59410.9475.010.48413.35612060±1.80±0.903.0&01310.2084.010.47813.3475.012.83916.3566.015.09719.232803.08.95511.4084.011.73414.9475.014.40918.3566.016.98121.632140±2.00±1.004.012.99016.5475.015.97920.3566.018.86524.032150100±2.40±1.204.014.87418.9475.018.33423.3566.021.69127.632&O28.09635.791160804.014.24618.1475.017.54922.3566.020.74926.432&026.84034.191180100±2.60士1.304.016.75821.3475.020.68926.3566.024.51731.232&031.86440.5912004.018.01422.9475.022.25928.3566.026.40133.632&034.37663.791注：表中理论质量按密度为7.85g/cm3计算。表3型钢弯曲角的外圆弧半径选用钢种外圆弧半径/mmt<44<T<8<DIV>普通碳素结构钢W2.5TW3.0T低合金结构钢W3.OT供需双方协议注：型钢弯曲角度的允许偏差不得大于±1.6允许偏差。表4型钢的长度允许偏差(mm)

表4型钢的长度允许偏差(mm)定尺精度长 度允许偏差普通定尺4000〜9000+100精确定尺4000〜6000+5>6000—9000+10注：1.型钢允许交付长度不小于2m的短尺，但其质量不得大于该批交货质量的5%。2.型钢壁厚等于或大于2.5mm时，弯曲度每米不得大于2.5mm，