FERRITE AUSTENITE TWO-PHASE STAINLESS STEEL AND MANUFACTURING METHOD THEREOF
To provide a ferrite and austenite two-phase stainless steel plate excellent in hardness and toughness and its manufacturing method.SOLUTION: Steel having a predetermined chemical composition is hot rolled under the conditions that the rolling reduction ratio of rolling at a temperature Tc (°C) or l...
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Main Authors | , |
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Format | Patent |
Language | English Japanese |
Published |
11.10.2023
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Subjects | |
Online Access | Get full text |
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Summary: | To provide a ferrite and austenite two-phase stainless steel plate excellent in hardness and toughness and its manufacturing method.SOLUTION: Steel having a predetermined chemical composition is hot rolled under the conditions that the rolling reduction ratio of rolling at a temperature Tc (°C) or lower is 1.2 or more, is hot-rolled under the condition where the final rolling pass temperature is (Tc-100)°C or higher, by air cooling for 20 seconds or more after the hot rolling, and then cooling at a cooling rate of 1°C/s or more in the temperature range from 800°C to 600°C, a PREN_Mn value is 35.0 or less, and Charpy impact value vE-20°C at -20°C is 100 J/cm2 or more, and a ferrite-austenite two-phase stainless steel plate having a Brinell hardness HBW3000 of 230 or more can be obtained. PREN_Mn value=Cr+3.3(Mo+0.5W)+16N-Mn Tc(°C)=930+50Mo(°C)SELECTED DRAWING: None
【課題】硬度と靭性に優れたフェライト・オーステナイト二相ステンレス鋼板およびその製造方法を提供する。【解決手段】所定の化学組成を有する鋼を、温度Tc(℃)以下でされる圧延の圧下比が1.2以上であり、圧延最終パス温度を(Tc-100)℃以上とする条件で熱間圧延し、前記熱間圧延後に20秒以上空冷してから800℃から600℃の温度区間を冷却速度1℃/s以上で冷却することにより、PREN_Mn値が35.0以下であり、-20℃におけるシャルピー衝撃値vE-20℃が100J/cm2以上であり、鋼板表層のブリネル硬さHBW3000が230以上であるフェライト・オーステナイト二相ステンレス鋼板を得ることができる。PREN_Mn値=Cr+3.3(Mo+0.5W)+16N-MnTc(℃)=930+50Mo (℃)【選択図】なし |
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Bibliography: | Application Number: JP20220051624 |