优质碳素结构钢牌号及机械性能

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1、优质碳素结构钢牌号及机械性能   优质非合金钢是指除普通非合金钢和特殊质量非合金钢以外的非合金钢，在生产过程中需要控制（例如控制晶粒度，降低硫、磷含量，改善表面质量或增加工艺控制等），以达到比普通质量非合金钢特殊的质量要求，但这种钢的生产不如特殊质量非合金钢严格。   10、优质碳素结构优质碳素结构钢属优质钢，不仅要保证化学成分也要保证机械性能。同时要求杂质（S、P）含量较低，其牌号用两位数字表示，代表钢中碳的名义万分含量，少数沸腾钢数字后加“F”，其中含锰量不超过0.8%的为较低含锰量钢，0.8-1.2%Mn为较高含锰量钢，并在

2、数字后面加“Mn”，根据GB699-88，优质碳素结构钢的牌号、化学成分及性能见表5-8、表5-9表5-8、优质碳素结构钢牌号及化学成分序号牌号化学成分，%CSiMnPSNiCrCu≤108F0.05-0.10≤0.030.25-0.500.0350.0350.250.10.25210F0.07-0.14≤0.070.25-0.500.0350.0350.250.150.25315F0.12-0.19≤0.070.25-0.500.0350.0350.250.250.2540.80.05-0.120.17-0.370.35-0.6

3、50.0350.0350.250.10.255100.07-0.140.17-0.370.35-0.650.0350.0350.250.150.256150.12-0.190.17-0.370.35-0.650.0350.0350.250.250.257200.17-0.240.17-0.370.35-0.650.0350.0350.250.250.258250.22-0.300.17-0.370.50-0.800.0350.0350.250.250.259300.27-0.350.17-0.370.50-0.800.0350.0

4、350.250.250.2510350.32-0.400.17-0.370.50-0.800.0350.0350.250.250.2511400.37-0.450.17-0.370.50-0.800.0350.0350.250.250.2512450.42-0.500.17-0.370.50-0.800.0350.0350.250.250.2513500.47-0.550.17-0.370.50-0.800.0350.0350.250.250.2514550.52-0.600.17-0.370.50-0.800.0350.0350

5、.250.250.2515600.57-0.650.17-0.370.50-0.800.0350.0350.250.250.2516650.62-0.700.17-0.370.50-0.800.0350.0350.250.250.2517700.67-0.750.17-0.370.50-0.800.0350.0350.250.250.2518750.72-0.800.17-0.370.50-0.800.0350.0350.250.250.2519800.77-0.850.17-0.370.50-0.800.0350.0350.25

6、0.250.2520850.82-0.900.17-0.370.50-0.800.0350.0350.250.250.252115Mn0.12-0.190.17-0.370.70-1.000.0350.0350.250.250.252220Mn0.17-0.240.17-0.370.70-1.000.0350.0350.250.250.252325Mn0.22-0.300.17-0.370.70-1.000.0350.0350.250.250.252430Mn0.27-0.350.17-0.370.70-1.000.0350.03

7、50.250.250.252535Mn0.32-0.400.17-0.370.70-1.000.0350.0350.250.250.252640Mn0.37-0.450.17-0.370.70-1.000.0350.0350.250.250.252745Mn0.42-0.500.17-0.370.70-1.000.0350.0350.250.250.252850Mn0.48-0.560.17-0.370.70-1.000.0350.0350.250.250.252960Mn0.57-0.650.17-0.370.70-1.000.

8、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.