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750 tons JIS G3114 hot-rolled plate grade SMA490BW to Korea in 2014
750 tons JIS G3114 hot-rolled plate grade SMA490BW to Korea in 2014
- Comments: C45 steel heat treatment: Quenching has low hardenability, and it is easy to cause uneven hardness of the drill rod during heat treatment, resulting in deformation or even cracking. The hardness after quenching is about 42 degrees, which is much lower tha
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