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采用金相显微镜、扫描电镜等对GOST-2钢-60℃低温冲击韧性不合格车轮进行检验分析,结果表明:其主要原因是磷含量高、MnS夹杂多、存在带状组织,且晶粒尺寸较大。在生产中通过加入铝钒元素细化晶粒,并采用低氧钢、低磷钢及超低硫钢冶炼工艺和钙处理等措施,消除了钢中的条状夹杂物,改善了车轮的低温冲击韧性,显著提高了产品的合格率。
The microstructure and fracture toughness of GOST-2 steel -60 ℃ low temperature impact toughness test were analyzed by metallographic microscope and scanning electron microscope. The results show that the main reason is the high content of phosphorus, the inclusion of MnS and the existence of banded structure, and the grain size Larger. In the production of aluminum and vanadium by refining the grain, and the use of low-oxygen steel, low-phosphorus steel and ultra-low sulfur steel smelting process and calcium and other measures to eliminate the strip of steel inclusions and improve the wheel low temperature Impact toughness, significantly improve the product pass rate.