结构用冷弯空心型钢(GBT6728—1986).doc

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1、结构用冷弯空心型钢（GB/T6728—1986）  (1)尺寸规格见表1一表3表1 方形空心钢的尺寸规格A一边长 t一壁厚R一外圆弧半径 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25±O.60±0.301.20.8671.10580±1.40±O.703.07.0719.0081.51.06l1.3524.09.22211.7471.751.2151.5485.O11.20914.3562.01.3631.

2、73690±1.50±0.753.O8.01310.208302.52.0322.5894.OlO.47813.3473.02.3613.0085.012.83916.35640±0.80±O.402.52.8173.5896.O15.09719.2323.03.3034.208100±1.60±0.804.O11.73414.9475.O14.40918.3564.04.1985.3476.O16.98l21.63250±1.00±0.502.53.6024.589120±1.80±O.904.O14.24618.1473.O4.2455.4085

3、.017.54922.3566.O20.74926.4324.O5.4546.9478.O26.84034.19l60±1.20±0.602.54.3875.589140±2.00±1.004.O16.75821.3473.05.1876.6085.020.68926.3564.06.7lO8.5476.O8.O24.51731.86431.23240.59l5.08.12910.356160±2.40±1.204.019.27024.547703.O6.1297.8085.O23.82930.3564.O7.96610.1476.O28.28536

4、.0325.09.69912.3568.036.88846.99l表2 矩形空心钢的尺寸规格A一长边B一短边t一壁厚R一外圆弧半径边长／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±O.501.21.3381.7051.51.6502.102302.52.8173.5893.O3.3034.2084.04.1985.34760±1.20±0.602.53.2094.0893.O3.7744.8084.04.8266.147402.53.6024.5893.04.2455.4084.05

5、.4546.94770503.O5.1876.6084.O6.7108.5475.O8.12910.3568040±1.40±O.702.54.3875.5893.O5.1876.6084.O6.7lO8.5475.O8.12910.356603.06.1297.8084.O7.966lO.1475.09.69912.3569040±1.50±O.753.O5.6587.2084.O7.3389.3475.O8.91411.356503.O6.1297.8084.07.966lO.1475.O9.69912.356603.06.6008.4084.O

6、8.594lO.9475.O10.48413.35610050±1.60±0.803.O6.6008.4084.08.59410.9475.010.48413.35612060±1.80±O.903.O8.01310.2084.O10.47813.3475.O12.83916.3566.015.09719.232803.08.95511.4084.O11.73414.9475.O14.40918.3566.016.98121.632140±2.00±1.004.O12.99016.5475.015.97920.3566.018.86524.03215

7、0100±2.40±1.204.014.87418.9475.O18.33423.3566.O21.69127.6328.O28.09635.791160804.O14.24618.1475.017.54922.3566.O20.74926.4328.026.84034.19l180100±2.60士1.304.O16.75821.3475.O20.68926.3566.O24.51731.2328.031.86440.5912004.018.01422.9475.O22.25928.3566.O26.40133.6328.O34.37663.79l

8、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