Matian Santie series stainless steel bar material

Abstract

The Asada-san steel-based stainless steel bars disclosed herein contain, by mass percent: C: 0.08–0.60%, Si: 0.1–2.0%, Mn: 0.1–3.0%, P: 0.10% or less, S: 0.150–0.400%, Cr: 11.0–16.0%, O: 0.015% or less. In a cross-section of the Asada-san steel-based stainless steel bar perpendicular to the axial direction, when the midpoint of the line segment connecting the centroid and a point on the surface with the minimum distance from the centroid to the surface is defined as the midpoint position, in a longitudinal section including the midpoint position and parallel to both the line segment and the axial direction, the average circular equivalent diameter of Mn sulfides is 4.0 μm or less, and the number of Mn sulfides per unit area is 0.010 or more per μm². In the longitudinal section, within the field of view that includes the position corresponding to the centroid of the cross section, the average circular equivalent diameter of Mn sulfides exceeds 4.0 μm, and the number of Mn sulfides per unit area does not reach 0.010 per μm2.

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