TWO-PHASE STAINLESS STEEL BOLT EXCELLENT IN LOW TEMPERATURE IMPACT RESISTANCE, AND MANUFACTURING METHOD THEREFOR

摘要

To provide a two-phases stainless steel bolt having largely improved low temperature impact resistance while using a two-phase stainless steel of SUS329J4L as a raw material, and a manufacturing method therefor.SOLUTION: A two-phase stainless steel bolt has a structure by cold rolling a wire of a two-phase stainless steel SUS329J4L with a chemical component of, by vol%, C≤0.030, Si≤1.00, Mn≤1.50, P≤0.040, S≤0.030, 5.50≤Ni≤7.50, 24.00≤Cr≤26.00, 2.50≤Mo≤3.50, 0.08≤N≤0.30, and the balance Fe, and conducting a solid solution heat treatment, and having a female thread by a cold rolling in a thread lower diameter with a bolt raw shape material having a bolt head part and the thread lower diameter.SELECTED DRAWING: Figure 1