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国产4145H钢通过严格控制Cr,Mn.Mo等合金元素的成分范围.并采用炉外精炼降低硫、磷及非金属夹杂物含量等措施,大幅度地提高了钢的淬透性.使国产4145H钢钻铤性能达到日本钻铤的质量水平.
Domestic 4145H steel through the strict control of Cr, Mn.Mo other alloying elements such as the composition of the range and the use of furnace refining to reduce sulfur, phosphorus and non-metallic inclusions and other measures to significantly improve the hardenability of the steel so that domestic 4145H Steel drill collar performance to Japan drill collar of the quality level.