莱钢生产的20crmntih钢成分波动较大，淬透性带8 ~10hrc，范围较宽，这制约齿轮钢质量档次的进一步提高。
The component fluctuation of 20crmntih steel produced by Laiwu steel was larger and the hardenability bands was 8 ~ 10 HRC, which restrained gear steel from improving quality grade further.
莱钢生产的20crmntih钢成分波动较大，淬透性带8 ~10hrc，范围较宽，这制约齿轮钢质量档次的进一步提高。
The component fluctuation of 20crmntih steel produced by Laiwu steel was larger and the hardenability bands was 8 ~ 10 HRC, which restrained gear steel from improving quality grade further.
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