Cr LOW-Cr FERRITIC STAINLESS STEEL WITH EXCELLENT VIBRATION DAMPING PROPERTY AND MANUFACTURING METHOD THEREOF

• Main Authors: RYU SUNGHEE, LEE KYE MAN, JUNG IL CHAN
• Format: Patent
• Language: English; Korean
• Published: 06.01.2020
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Disclosed are low-Cr ferritic stainless steel having an excellent vibration damping property, capable of absorbing external vibration energy through control on a precipitate, and a manufacturing method thereof. According to an embodiment of the present invention, the low-Cr ferritic stainless steel having an excellent vibration damping property includes: 0.005-0.01 wt% of C; 0.005-0.01 wt% of N; 0.1-0.9 wt% of Si; 0.1-0.9 wt% of Mn; 9-14 wt% of Cr; no more than 0.3 wt% of Ni, no more than 0.04 wt% of P; no more than 0.002 wt% of S; 0.15-0.3 wt% of Ti; 0.15-0.3 wt% of Nb; 0.15-0.3 wt% of Cu; 0.01-0.05 wt% of Al; and the remaining of Fe and inevitable impurities. The stainless steel also includes no less than 5×102 units/mm^2 of Nb laves phase precipitates and Cu precipitates. 석출물 제어를 통해 외부 진동에너지를 흡수하는 진동 감쇄능이 우수한 저Cr 페라이트계 스테인리스강 및 그 제조방법을 개시한다. 본 발명의 일 실시예에 따른 진동 감쇄능이 우수한 저Cr 페라이트계 스테인리스강은, 중량%로, C: 0.005 내지 0.01%, N: 0.005 내지 0.01%, Si: 0.1 내지 0.9%, Mn: 0.1 내지 0.9%, Cr: 9 내지 14%, Ni: 0.3% 이하, P: 0.04% 이하, S: 0.002% 이하, Ti: 0.15 내지 0.3%, Nb: 0.15 내지 0.3%, Cu: 0.15 내지 0.3%, Al: 0.01 내지 0.05%, 나머지 Fe 및 불가피한 불순물을 포함하고, Nb 라베스상(laves phase) 석출물 및 Cu 석출물을 5×10개/㎟ 이상 포함한다.