附表一 美标、国标、日标角钢外形尺寸允许偏差对照表ANGLES美标ASTM日标JIS国标GB9787-88尺寸mm允许偏差mm允许偏差mm型号允许偏差mm边宽厚度 尺寸边宽尺寸厚度厚度等边角钢边宽厚度x4.764.89.5at边宽1302-5.60.80.4a25.40.790.2030.254501.5t6.30.60.76.3-91.20.625a511.190.2540.2540.30450a1002.06.3t100.70.810-141.80.751a761.590.3050.3810.381100a2003.010t160.81.016-202.51.076a102+3.18,-2.38200a4.016t251.01.2不等边角钢102152+4.8,-3.186.3/4-9/5.61.50.610/6.3-14/92.00.716/10-20/12.52.51.0附表二 美标、国标、日标槽钢外形尺寸允许偏差对照表CHANNELS美标ASTM日标JIS国标GB707-88尺寸mm允许偏差mm允许偏差mm型号允许偏差mm腰高腿高厚度mm，尺寸腿高腰高尺寸厚度厚度腿宽高度腰厚3/163/16aht边宽1305-81.51.50.4a380.790.790.2540.381a50/h1001.51.5t8-142.02.00.538a761.591.590.3810.50850a100/100h2002.02.06.3t14-182.52.00.676a178+2.38，-1.593.18100a200/200a4003.03.010t18-303.03.00.7178a356+3.18,-2.38+3.18，-3.97200a/400h4.04.016t30-403.53.00.8356a+4.76,-3.18+3.18，-4.7625a1.5附表三 美标、国标、日标工字钢外形尺寸允许偏差对照表I BEAM美标ASTM日标JIS国标GB706-88尺寸mm允许偏差mm允许偏差mm型号允许偏差mm腰高腿高厚度mm，尺寸腿高腰高尺寸厚度厚度腿宽高度腰厚3/163/16aht边宽130142.02.00.576a178+2.38-1.593.18a50/h1001.51.5t14-182.52.00.5178a356+3.18-2.383.9750a100/100h2002.02.06.3t18-303.03.00.7356a610+4.76-3.184.76100a200/200h4003.03.010t30-403.53.00.8200a/400h4.04.016t40-634.04.00.925t1.5附表四 美标、国标、日标、欧标型钢化学成分、物理性能对照表标准牌号化学成分 %, 物理性能CMnSiSPVNb屈服点抗拉强度伸长率%, 2 8ASTM（美标）A360.260.40.050.04250400-5502320A572 GR500.231.350.01-0.150.005-0.053454502118GB 700-88 （国标）Q235A0.14-0.220.3-0.650.30.050.05235375-46026Q235B0.12-0.200.3-0.700.0450.045235375-46026GB/T1591-94（国标）Q345A0.201.0-1.60.550.0450.0450.02-0.150.015-0.06345470-63021Q345B0.201.0-1.60.550.0400.0400.02-0.150.015-0.06345470-63021JIS（日标）SS4000.050.05245400-51024SS5400.301.60.040.04400540以上17EN 10025（欧标）S235JR厚度16mm1.40.0450.045厚度16mm1640mm1640mm31000.20225340-470S235JO厚度16mm1.40.040.04厚度16mm1640mm1640mm31000.17225340-470S355JR0.241.60.550.0450.045厚度16mm1640mm3100345490-630S355JO0.201.60.550.0400.040厚度16mm1640mm3100345490-630