KR20090121308A - 고온에서의 면압 피로 강도가 우수한 침탄 질화 고주파 담금질 강 부품 및 그 제조 방법 - Google Patents
고온에서의 면압 피로 강도가 우수한 침탄 질화 고주파 담금질 강 부품 및 그 제조 방법 Download PDFInfo
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Abstract
Description
Claims (6)
- 화학 성분이 질량%로, C: 0.005 내지 0.8%, Si: 2.0% 이하, Mn: 0.2 내지 3.0%, P: 0.03% 이하, S: 0.005 내지 0.10%, Ni: 3.0% 이하(0%를 포함), Cr: 5.0% 이하(0%를 포함), Mo: 2.0% 이하(0%를 포함), W: 1.0% 이하(0%를 포함), B: 0.0050% 이하(0%를 포함), O: 0.0050% 이하, N: 0.003 내지 0.03%를 함유하고, 또한 Al: 0.005 내지 0.2%, Ti: 0.005 내지 0.2% 중에서 1종 또는 2종, 및 V: 0.3% 이하(0%를 포함), Nb: 0.3% 이하(0%를 포함) 중에서 1종 또는 2종을 함유하고, 잔부가 실질적으로 철과 불가피한 불순물로 이루어지는 강으로 이루어지고, 침탄 질화 처리한 후에 고주파 담금질 처리한 강 부품으로서, 표면의 N 농도가 0.1 내지 0.8 질량%인 동시에, N 농도와 C 농도와의 합이 1.0 내지 2.0 질량%이고, 표면의 잔류 오스테나이트 양이 15 체적% 미만이며, 표면으로부터의 불완전 담금질 층의 깊이가 5 ㎛ 미만이고, 또한 표면의 X선 회절 반값 폭이 6.0도 이상인 것을 특징으로 하는 고온에서의 면압 피로 강도가 우수한 침탄 질화 고주파 담금질 강 부품.
- 제1항에 있어서, 강의 화학 성분이 질량%로, Ca: 0.0005 내지 0.01%, Mg: 0.0005 내지 0.01%, Zr: 0.0005 내지 0.05%, Te: 0.0005 내지 0.1%로 이루어지는 군으로부터 선택되는 1종 또는 2종 이상을 추가로 함유하는 것을 특징으로 하는 고온에서의 면압 피로 강도가 우수한 침탄 질화 고주파 담금질 강 부품.
- 제1항 또는 제2항에 있어서, 강 부품이 기어, 무단 변속기, 등속 조인트 또는 허브 중 어느 하나인 것을 특징으로 하는 고온에서의 면압 피로 강도가 우수한 침탄 질화 고주파 담금질 강 부품.
- 화학 성분이 질량%로,C: 0.005 내지 0.8%,Si: 2.0% 이하,Mn: 0.2 내지 3.0%,P: 0.03% 이하,S: 0.005 내지 0.10%,Ni: 3.0% 이하(0%를 포함),Cr: 5.0% 이하(0%를 포함),Mo: 2.0% 이하(0%를 포함),W: 1.0% 이하(0%를 포함),B: 0.0050% 이하(0%를 포함),O: 0.0050% 이하,N: 0.003 내지 0.03%를 함유하고, 또한Al: 0.005 내지 0.2%,Ti: 0.005 내지 0.2% 중에서 1종 또는 2종 및V: 0.3% 이하(0%를 포함),Nb: 0.3% 이하(0%를 포함) 중에서 1종 또는 2종을 함유하며, 잔부가 실질적으로 철과 불가피한 불순물로 이루어지는 강을 사용하여 부품을 성형하고, 침탄 질화 처리한 후에 오일 또는 염 담금질을 하며, 이어서 고주파 가열하고, 온도가 4O℃ 미만인 물 또는 폴리머 담금질제에 의한 담금질을 하고, 이 부품의 최표면의 N 농도가 0.1 내지 0.8 질량%인 동시에 N 농도와 C 농도와의 합을 1.0 내지 2.0 질량%로 하며, 표면의 잔류 오스테나이트 양을 15 체적% 미만으로 하고, 표면으로부터의 불완전 담금질 층의 깊이를 5㎛ 미만으로 하며, 또한 표면의 X선 회절 반값 폭을 6.0도 이상으로 하는 것을 특징으로 하는 고온에서의 면압 피로 강도가 우수한 침탄 질화 고주파 담금질 강 부품의 제조 방법.
- 제4항에 있어서, 강의 화학 성분이 질량%로Ca: 0.0005 내지 0.01%,Mg: 0.0005 내지 0.01%,Zr: 0.0005 내지 0.05%,Te: 0.0005 내지 0.1%로 이루어지는 군으로부터 선택되는 1종 또는 2종 이상을 추가로 함유하는 것을 특징으로 하는 고온에서의 면압 피로 강도가 우수한 침탄 질화 고주파 담금질 강 부품의 제조 방법.
- 제4항 또는 제5항에 있어서, 강 부품이 기어, 무단 변속기, 등속 조인트 또는 허브 중 어느 하나인 것을 특징으로 하는 고온에서의 면압 피로 강도가 우수한 침탄 질화 고주파 담금질 강 부품의 제조 방법.
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