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1、优质碳素结构钢化学成分和力学性能 根据GB699-1999，按统一数字代号和牌号规定的化学成分和物理性能见以下各表： 表1：化学成分序号统一数字代号牌号化学成分.%CSiMnCrNiCu不大于1U2008008F0.05O.110.030.250.500.100.300.252U2010010FO.070.130.07O.250.500.150.300.253U2015015F0.120.180.07O.250.500.25O.300.254U20082080.050.110.170.37O.350.650.10O.300.255U2010210O.07O.130.170.37O.350.65
2、O.15O.300.256U20152150.120.18O.170.370.350.65O.25O.300.257U20202200.170.230.170.37O.350.65O.25O.300.258U2025225O.220.29O.170.370.500.80O.250.300.259U20302300.270.340.170.37O.500.80O.25O.300.2510U20352350.320.39O.170.370.500.80O.25O.300.2511U20402400.370.44O.170.370.500.800.Z5O.300.2512U2045245O.42O.
3、50O.170.370.500.80O.25O.300.2513U2050250O.470.55O.170.37O.500.80O.25O.300.2514U2055255O.520.600.170.370.500.80O.250.300.2515U2060260O.570.650.170.370.500.800.25O.300.2516U20652650.620.70O.170.370.500.80O.25O.300.2517U2070270O.670.75O.170.370.500.800.250.300.2518U2075275O.720.800.170.370.500.80O.250.
4、300.2519U2080280O.770.85O.170.370.500.800.250.300.2520U2085285O.820.900.170.370.500.800.25O.300.2521U2115215MnO.120.180.170.37O.701.000.25O.300.2522U2120220Mn0.170.230.170.370.70I.000.25O.300.2523U2125225Mn0.220.290.170.37O.701.00O.25O.300.2524U2130230MnO.270.340.170.37O.701.00O.25O.300.2525U2135235
5、M13O.320.390.170.37O.701.00O.250.300.2526U2140240M13O.370.440.170.370.701.000.25O.300.2527U2145245MnO.420.50O.170.37O.701.000.25O.300.2528U2150250Mn0.480.560.170.37O.701.00O.25O.300.2529U2160260Mn0.57O，650.170,37O.701.00O.25O.300.2530U2165265M13O.620.700.170.37O.901.20O.25O.300.2531U2170270M130.670.
6、750.170.37O.901.20O.25O.300.25 注：表1所列牌号为优质钢。如果是高级优质钢，在牌号后面加“A”(统一数字代号最后一位数字改为“3”)；如果是特级优质钢，在牌号后面加。E”(统一数字代号最后一位数字改为“6”)；对于沸腾钢，牌号后面为“F” (统一数字代号最后一位数字为“0”)；对于半镇静钢，牌号后面为“b”(统一数字代号最后位数字为“1”) 冷冲压用沸腾钢含硅量不大于0.03。氧气转炉冶炼的钢其含氮量应不大于0.008。供方能保证合格时，可不做分析。经供需双方协议，0825钢可供应硅含量不大于0.17的半镇静钢，其牌号为08b 25b。 钢材(或坯)的化学成分允许
7、偏差应符合GBT 222-1984标准中表2的规定。 表2组 别PS不大于，%优质钢0.0350.035高级优质钢0.030O.030特级优质钢0.0250.020切削加工用钢材或冷拔坯料用钢材交货状态硬度应符合表3规定。不退火钢的硬度，供方若能保证合格时，可不作检验。高温回火或正火后的硬度指标，由供需双方协商确定。 表3序号牌号试样毛坯尺寸mm推荐热处理.C力学性能钢材交货状态硬度HBSlO3000不大于正火淬火回火bMPasMPa5%Aku2J不小于未热处理钢退火钢108F259302951753560131210F259303151853300137315F259203552052955
8、143408259303251953360131510259303352053l001376152592037522527551437202591041024525551 S682525900870600450275235071170930258808606004902952150631791035258708506005303152045551971140258608406005703351945472171871245258508406006003551640392291971350258308306006303751440312412071455258208206006453801335
9、25521715602581067540012352552291665258106954101030255229177025790715420930269， 2291875试样82048010808807302852411980试样820480108093()6302852412085试样82048011309806303022552115Mn259204102452655l 632220Mn2591045027524501972325M13259008706004902952250712072430Mn258808606005403152045632171872535Mrl258708506
10、005603351845552291972640Mn258608406005903551745472292072745Mrl258508406006203751540392412172850M132583083060064S3901340312552172960M132581069541011352692293065Mn258307354309302852293170M125790785450830285229注1对于直径或厚度小于25 mm的钢材，热处理是在与成品截面尺寸相同的试样毛坯上进行。 2表中所列正火推荐保温时间不少于30 rain.空冷；淬火推荐保温时间不少于30 rain，75、80和85钢油冷.其余钢水冷；回火推荐保温时间不少于1 h低倍组织 镇静钢钢材的横截面酸浸低倍组织试片上不得有目视可见的缩孔、气泡、裂纹、夹杂、翻皮和白供切削加工用的钢材允许有不
