FERRITE STAINLESS BAR-SHAPED STEEL MATERIAL AND ITS MANUFACTURING METHOD

To provide a thick ferrite stainless bar-shaped steel material having excellent intergranular corrosion resistance even in a weld heat affected zone and excellent in toughness in a center portion of a steel material.SOLUTION: A ferrite stainless bar-shaped steel material contains C: 0.03% or less, Si: 0.01-1.0%, Mn: 0.010-1.0%, Ni: 0.05-1.0%, Cr: 10.5-25%, Cu: 0.02-1.0%, N: 0.03% or less, and Nb: 0.10-1.0%, in which in an extraction residue recovered with a filter of 0.2 μm mesh by electroextraction, precipitates of Nb carbonitrides and/or M6C are contained, and an X-ray diffraction intensity of a 112 plane of a Rafes phase is less than 20% of the X-ray diffraction intensity of a 111 plane of the Nb carbonitride.SELECTED DRAWING: None 【課題】溶接熱影響部においても良好な耐粒界腐食性を有し、鋼材中心部の靭性が優れる太径のフェライト系ステンレス棒状鋼材を提供する。【解決手段】Ｃ：０．０３％以下、Ｓｉ：０．０１－１．０％、Ｍｎ：０．０１０－１．０％、Ｎｉ：０．０５－１．０％、Ｃｒ：１０．５－２５％、Ｃｕ：０．０２－１．０％、Ｎ：０．０３％以下、Ｎｂ：０．１０－１．０％を含有し、電解抽出により０．２μｍメッシュのフィルターで回収した抽出残渣に、Ｎｂ炭窒化物および／またはＭ６Ｃの析出物が含まれ、かつラーフェス相１１２面のＸ線回折強度がＮｂ炭窒化物１１１面のＸ線回折強度の２０％未満であるフェライト系ステンレス棒状鋼材。【選択図】なし