单选题
在45钢中加入Mn形成45Mn，Mn起到的作用是（）。
发布日期：2020-12-11
只有固溶强化作用
溶强化和提高淬透性
细化晶粒
二次硬化
试题解析
45号钢板
45#是钢的牌号是一种优质碳素结构钢，对应日标S45C, 美标: 1045，德标 C45。其特征是相比普通A3钢，具有更高的强度，抗变形能力。
- 中文名
- 45号钢板
- σb\\Mpa
- ≥600
- δ5\\%
- ≥16
- 材料密度
- 7.85g/cm
- 外文名
- carbon steel
- σs\\Mpa
- ≥355
- 常见厚度
- 0.5－80 mm
- 国标牌号
- GB/T 699-1999
用是
用是，读音为yòng shì，汉语词语，意思是因此。出处《汉书·赵充国传》。
- 中文名
- 用是
- 出处
- 《汉书·赵充国传》：
- 解释
- 因此
- 注音
- ㄩㄥˋ ㄕㄧˋ
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