單項(xiàng)選擇題20MnSi的Mn含量在()

A.0.70~1.00%
B.1.00~1.20%
C.1.20~1.70%
D.1.70~2.00%


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1.單項(xiàng)選擇題20MnSi的S含量應(yīng)小于()

A.0.045%
B.0.035%
C.0.030%
D.0.020%

2.單項(xiàng)選擇題Q235B屬于()

A.普通鋼
B.優(yōu)質(zhì)鋼
C.高級(jí)優(yōu)質(zhì)鋼
D.特級(jí)優(yōu)質(zhì)鋼

3.單項(xiàng)選擇題Q235B的Mn含量在()

A.0.10~0.20%
B.0.20~0.30%
C.0.30~0.70%
D.0.70~1.00%

4.單項(xiàng)選擇題Q235B的P含量應(yīng)小于()

A.0.045%
B.0.035%
C.0.030%
D.0.020%

5.單項(xiàng)選擇題氧氣頂吹轉(zhuǎn)爐對(duì)氧氣純度的要求是()。

A.>99.2%
B.≧99.3%
C.≧99.5%
D.99.7%