the roll surface hardening
... chemical surface hardening 化学表面硬化法 The Roll Surface Hardening 着墨辊暗地强硬 induced heat surface hardening 感应加热表面淬火 ...
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the roll surface hardening
轧辊表面硬化
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The principal problems with respect to roll working life are cracking at the surface of roll for hot-rolling and that effective zone of quench-hardening of roll for cold-rolling is too narrow.
热轧工作辊的裂纹损坏和冷轧工作辊有效淬硬层过浅是两大突出问题。
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