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50BA钢是含有微量硼(0.0005～0.0035%)的碳素结构钢,主要用来制作有效尺寸小于18毫米的枪械零件。加入微量的硼能显著地改变钢的淬透性。研究表明,钢中最佳的含硼量为0.001～0.002%(酸溶硼),加入更多的硼,无助于淬透性的提高,相反的,会有过剩的硼沿奥氏体晶界以Fe_(23)(C,B)_6(简称硼相)的形式沉淀析出,当硼的含量过高(大于
50BA steel is a carbon structural steel containing a trace amount of boron (0.0005-0.0035%), mainly used to make gun parts with effective dimensions less than 18 mm. Addition of trace amounts of boron significantly changes the hardenability of the steel. Studies have shown that the best boron content of steel is 0.001 to 0.002% (acid soluble boron), adding more boron does not help improve the hardenability, on the contrary, there will be excess boron along the austenite crystal Boundary to Fe_ (23) (C, B) _6 (referred to as the boron phase) in the form of precipitation, when the boron content is too high