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1、优质碳素结构钢热轧厚钢板和宽钢带(GB/T711-1988 )(1) 尺寸规格钢板和钢带的适用厚度范围为460mm。其尺寸规格和允许偏差应符合GB/T709热轧钢板和钢带的规定。(2) 牌号和化学成分见表 5-20。表 5-20 优质碳素结构钢热轧厚钢板和宽钢带的牌号和化学成分牌号化学成分(质量分数)(%)CsiMnPSCrNiCu05F0.060.030.40.0.0350.0400.100.250.2508F0.05 0.110.030.25 0.500.0350.0400.100.250.25080.05 0.120.17 0.370.35 0.650.0350.0400.100, 25
2、0.2510F0.07 0.140.070.25 0.500.0350.0400.150.250.25100.07 0.140.17 0.370.35 0.650.0350.0400.150.250.2515F0.12 0.190.070.25 0.500.0350.0400.250.250.25150.12 0.190.17 0.370.35 0.650.0350.0400.250.250.2520F0.17 0.240.070.25 0.500.0350.0400.250.250.25200.17 0.240.17 0.370.35 0.650.0350.0400.250.250.2525
3、0.22 0.300.17 0.370.5 0 0.800.0350.0400.250.250.25300.27 0.350.17 0.370.5 0 0.800.0350.0400.250.250.25350.32 0.400.17 0.370.5 0 0.800.0350.0400.250.250.25400.370, 450.17 0.370.5 0 0.800.0350.0400.250.250.25450.42 0.500.17 0.370.5 0 0.800.0350.0400.250.250.25500.47 0.550.17 0.370.5 0 0.800.0350.0400.
4、250.250.25550.52 0.600.17 0.370.5 0 0.800.0350.0400.250.250.25600.57 0.650.17 0.370.5 0 0.800.0350.0400.250.250.25650.62 0.700.17 0.370.5 0 0.800.0350.0400.250.250.25700.67 0.750.17 0.370.5 0 0.800.0350.0400.250.250.2520Mn0.17 0.240.17 0.370.7 0 1.000.0350.0400.250.250.2525Mn0.22 0.300.17 0.370.7 0
5、1.000.0350.0400.250.250.2530Mn0.27 0.350.17 0.370.7 0 1.000.0350.0400.250.250.2540Mn0.37 0.450.17 0.370.7 0 1.000.0350.0400.250.250.2550Mn0.48 0.560.17 0.370.7 0 1.000.0350.0400.250.250.2560Mn0.57 0.650.17 0.370.7 0 1.000.0350.0400.250.250.2565Mn0.62 0.700.17 0.370.9 0 1.200.0350.0400.250.250.25注：1.
6、08 钢允许用铝代替硅脱氧。此时，钢中含锰量下限为0.25%，含硅量不大于 0.03%钢中酸溶铝AL含量为0.015%0.065%或全铝ALt.含量为0.02%0.07%，牌号为08A1。2. 上述含量皆指质量分数。(3) 交货状态钢板和钢带以热处理(正火、退火或高温回火)状态交货(4) 力学性能见表 5-21。表 5-21 优质碳素结构钢热轧厚钢板和宽钢带的力学性能牌号抗拉强度6b/MPa伸长率& 5(%)牌号抗拉强度6b/MPa伸长率& 5(%)08F3153450625160832533556451310F3253260675121033532656951015F355307071591
7、53703020Mn4502420F3802725Mn49022204102830Mn54020254502440Mn59017304902250Mn65013355302060Mn695ll405701965Mn73594560017注：1.热处理或热轧状态交货的钢板和钢带，抗拉强度、伸长率应符合上表的规定。但退火 或高温回火状态交货的钢板，当其伸长率较表中规定提高2%以上(绝对值)时，允许抗拉强 度比表中规定降低40MPa。2.08AI钢各项性能应符合08号钢板和钢带的要求。3钢板和钢带厚度大于20mm时，厚度每增加lmm,伸长率允许降低0.25%(绝对值)，但不得大于下列数值：厚度W32mm2%；厚度32mm 3%。(5) 用途主要用于制造机器结构零部件。
