1、UDC669.14-452H48GB中华人民共和国国家标准GB/T13792-92带式输送机托辊用电焊钢管Welded steel pipe forsupporting roller of belt conveyer1992-11-16发布1993-06-01实施国家技术监督局发布GB/T13792-92表1理论允许偏差，mm外径D壁厚S重量外径壁摩同戴而mmmmkg/m普通级较高级普通级较高级壁厚差3.24.760.320.2463.50.50士0.304.56.550.450.343.25.740.320.2476.00.500.304.57.930.450.343.26.770.320.
2、2489.0士0.60士0.404.59.380.45士0.343.28.270.32士0.24108.00.70士0.404.511.490.450.344.514.26土0.450.347.5%133.00.800.605.015.780.500.384.517.140.450.34159.05.018.990.900.600.500.386.022.640.60士0.455.023.300.500.38194.01.00.806.027.320.60士0.455.026.390.500.38219.01.10.806.031.520.60士0.454.2.2定尺长度钢管的定尺长度应在通常
3、长度范围内，其长度允许偏差为十15mm。42.3倍尺长度钢管的倍尺长度应在通常长度范围内，每个倍尺间应留出510mm的切口余量，钢管全长的允许偏差为+15mm.4.3弯曲度普通精度钢管的弯曲度每米不大于1.0mm,较高精度钢管的弯曲度每米不大于0.5mm。4.4端面钢管的两端面应与中心线垂直，并应清除毛刺。4.5椭圆度钢管的椭圆度应不超过外径公差之半。4.6交货重量钢管按实际重量交货，亦可按理论重量交货，钢管每米的理论重量按下式计算（钢的密度为7.85kg/dm):W=0.02466(D-S)S式中：W一钢管每米理论重量，kg/m:D一钢管公称外径，mm,S一钢管公称壁厚，mm。4.7标记示例2
