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我厂使用含 C0.12%;Mn0.6%;S、P0.015%;Si0.2%;Ni3.5%(通常叫3.5Ni)的钢制作低温容器在焊接试样的金相检验中发现.过热段有魏氏组织.在不预热焊接的条件下尤为严重(图1)。亚共析钢中的魏氏组织,是一群按一定方向由奥氏体晶界边缘向晶粒内生长的
I plant using C0.12%; Mn0.6%; S, P0.015%; Si0.2%; Ni3.5% (usually called 3.5Ni) made of low-temperature steel containers in the metallographic examination of welding samples It was found that overheated sections were Widmanstack, which was particularly severe without preheating (Fig. 1). Wei hypoeutectoid steel organization, is a group of a certain direction from the edge of austenite grain boundaries to grain growth