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優良碳素結構鋼牌號及機械性能

更新时间:2019-11-28 13:33人气:6432

優良非合金鋼是指除普通非合金鋼和特殊質量非合金鋼以外的非合金鋼 ,在生產過程中需要控製(例如控製晶粒度,降低硫、磷含量,改善表麵質量或增加工藝控製等) ,以達到比普通質量非合金鋼特殊的質量要求 ,但這類鋼的生產不如特殊質量非合金鋼嚴格。

10、優良碳素結構

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

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