優良碳素結構鋼屬優良鋼，不僅要保證化學成分也要保證機械性能。同時要求雜質（S、P）含量較低，其牌號用兩位數字表示，代表鋼中碳的名義萬分含量，少數沸騰鋼數字後加“F”，其中含錳量不超過0.8%的為較低含錳量鋼，0.8-1.2%Mn為較高含錳量鋼，並在數字後麵加“Mn”，根據GB699-88，優良碳素結構鋼的牌號、化學成分及性能見表5-8、表5-9

表5-8 、優良碳素結構鋼牌號及化學成分

序號牌號化學成分，%CSiMnPSNiCrCu不大於108F0.05-0.10≤0.030.25-0.500.0350.0350.250.100.25210F0.07-0.14≤0.070.25-0.500.0350.0350.250.150.25315F0.12-0.19≤0.070.25-0.500.0350.0350.250.250.2540.80.05-0.120.17-0.370.35-0.650.0350.0350.250.100.255100.07-0.140.17-0.370.35-0.650.0350.0350.250.150.256150.12-0.190.17-0.370.35-0.650.0350.0350.250.250.257200.17-0.240.17-0.370.35-0.650.0350.0350.250.250.258250.22-0.300.17-0.370.50-0.800.0350.0350.250.250.259300.27-0.350.17-0.370.50-0.800.0350.0350.250.250.2510350.32-0.400.17-0.370.50-0.800.0350.0350.250.250.2511400.37-0.450.17-0.370.50-0.800.0350.0350.250.250.2512450.42-0.500.17-0.370.50-0.800.0350.0350.250.250.2513500.47-0.550.17-0.370.50-0.800.0350.0350.250.250.2514550.52-0.600.17-0.370.50-0.800.0350.0350.250.250.2515600.57-0.650.17-0.370.50-0.800.0350.0350.250.250.2516650.62-0.700.17-0.370.50-0.800.0350.0350.250.250.2517700.67-0.750.17-0.370.50-0.800.0350.0350.250.250.2518750.72-0.800.17-0.370.50-0.800.0350.0350.250.250.2519800.77-0.850.17-0.370.50-0.800.0350.0350.250.250.2520850.82-0.900.17-0.370.50-0.800.0350.0350.250.250.252115Mn0.12-0.190.17-0.370.70-1.000.0350.0350.250.250.252220Mn0.17-0.240.17-0.370.70-1.000.0350.0350.250.250.252325Mn0.22-0.300.17-0.370.70-1.000.0350.0350.250.250.252430Mn0.27-0.350.17-0.370.70-1.000.0350.0350.250.250.252535Mn0.32-0.400.17-0.370.70-1.000.0350.0350.250.250.252640Mn0.37-0.450.17-0.370.70-1.000.0350.0350.250.250.252745Mn0.42-0.500.17-0.370.70-1.000.0350.0350.250.250.252850Mn0.48-0.560.17-0.370.70-1.000.0350.0350.250.250.252960Mn0.57-0.650.17-0.370.70-1.000.0350.0350.250.250.253065Mn0.62-0.700.17-0.370.90-1.200.0350.0350.250.250.253170Mn0.67-0.750.17-0.370.90-1.200.0350.0350.250.250.25

表5-9、優良碳素結構鋼機械性能

序號牌號試樣毛壞尺寸mm推薦熱處理，°C力學性能鋼材交貨狀況硬度HB正火淬火回火бbN/mm2

(Kgf/mm2)

бsN/mm2

(Kgf/mm2)

δs%

φ%

Ak(ak)J

(Kgf.m/cm2)

不大於不小於未熱處理退火鋼108F25930295(30)175(18)3560131210F25930315(32)185(19)3355137315F25920355(36)205(21)295514340825930325(33)195(20)336013151025930335(34)205(21)3155137 61525920375(38)225(23)2755143 72025910410(42)245(25)2555156 82525900870600450(46)275(28)235071(9)170 93025880860600490(50)295(30)215063(8)179103525870850600530(54)315(32)204555(7)197114025860840600570(58)335(34)194547(6)217187124525850840600600(61)355(36)164039(5)229197135025830830600630(64)375(38)144031(4)241207145525820820600645(66)380(39)1335 255217156025810675(69)400(41)1235 255229166525810695(71)410(42)1030255229177025790715(73)420(43)9302692291875試樣8204801080(110)880(90)730 2852411980試樣8204801080(110)930(95)6302852412085試樣8204801130(115)980(100)6303022552115Mn25920410(42)245(25)26551632220Mn25910450(46)275(28)24501972325Mn25900870600490(50)295(30)225071(9)207 2430Mn25880860600540(55)315(32)204563(8)2171872535Mn25870850600560(57)335(34)184555(7)2291972640Mn25860840600590(60)355(36)174547(6)2292072745Mn25850840600620(63)375(38)154039(5)2412172850Mn25830830600645(66)390(40)134031(4)2552172960Mn25810695(71)410(42)1135 2692293065Mn25810735(75)430(44)930 2852293170Mn25790785(80)450(46)830 285229

上一条:2012年鋼鐵前景概況下一条:最新高壓無縫鋼管標準，最全高壓無縫鋼管標準