A method for producing high-strength, high-strength stainless steel materials with excellent ductility and no welding softening

Abstract

Abstract Translated from Japanese (57)【要約】 【目的】 構造部材として要求される９００Ｎ／ｍｍ 2 以上の高い０．２％耐力を示し、かつ高い延性と優れた 耐溶接軟化特性をもつ高耐力・高強度ステンレス鋼材を 得る。 【構成】 この高耐力・高強度ステンレス鋼材は、Ｃ： ０．１０％以下、Ｓｉ：４．５％以下、Ｍｎ：５．０％ 以下、Ｐ：０．０６０％以下、Ｓ：０．０３０％以下、 Ｃｒ：１０．０〜１７．０％、Ｎｉ：３．０〜１０．０ ％、Ｎ：０．１０％以下を含み、さらに選択的にＣｕ， Ｍｏ，Ｗ，Ｃｏの１種以上合計で４．０％以下および／ またはＴｉ，Ｎｂ，Ｖ，Ｚｒ，Ａｌ，Ｂ，Ｔａの１種以 上合計で１．０％以下を含み、残部Ｆｅと不可避的不純 物からなり、添加元素に応じて定義されるＮｉｅｑの値 が１３．０〜１７．５の範囲内にある鋼に、５７５〜７ ５０℃の温度範囲で６０分未満の熱処理を施した後、４ ００〜６００℃の温度範囲で３０分以下の熱処理を施す ことを特徴とする製造方法にて製造できる。 (57) [Abstract] [Purpose] 900N / mm 2 required for structural members A high yield strength and high strength stainless steel material having the above high 0.2% proof stress, high ductility and excellent weld softening resistance is obtained. [Structure] This high yield strength and high strength stainless steel material is C: 0.10% or less, Si: 4.5% or less, Mn: 5.0% Hereinafter, P: 0.060% or less, S: 0.030% or less, Cr: 10.0 to 17.0%, Ni: 3.0 to 10.0 %, N: 0.10% or less, and optionally Cu, One or more of Mo, W and Co in total 4.0% or less and / Alternatively, at least one of Ti, Nb, V, Zr, Al, B, and Ta is contained in a total amount of 1.0% or less, the balance is Fe and unavoidable impurities, and the Nieq value defined according to the additive element is 13 or less. For steels in the range of .0 to 17.5, 575 to 7 After heat treatment for less than 60 minutes in the temperature range of 50 ° C, 4 It can be manufactured by a manufacturing method characterized by performing heat treatment for 30 minutes or less in a temperature range of 00 to 600 ° C.

Inventors

• 👤 Takashi Igawa
• 👤 孝 井川
• 👤 Hiroshi Fujimoto
• 👤 廣 藤本

Bibliographic Details