US2007006945A1PendingUtilityA1
Martensite stainless steel
Est. expiryJul 5, 2025(expired)· nominal 20-yr term from priority
C22C 38/02C22C 38/24C22C 38/04
49
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
The present invention relates to a martensite stainless steel with excellent toughness and used as oil well pipes. The martensite stainless steel according to the present invention comprises, by mass percent, 0.15 to 0.21% of C, 0.05 to 1.00% of Si, 0.3 to 1.00% of Mn, 10.5 to 14.00% of Cr, not greater than 0.010% of Al, not greater than 0.050% of P, not greater than 0.010% of S, 0 to 0.050% of Ti, 0 to 0.50% of V, 0 to 0.020% of Nb, not greater than 0.1% of N, and the balance being Fe and impurities, and the amount of Cr carbonitride precipitating at grain boundary is not greater than 5%.
Claims
exact text as granted — not AI-modified1 . Martensite stainless steel comprising, by mass percent, 0.15 to 0.21% of C, 0.05 to 1.00% of Si, 0.3 to 1.00% of Mn, 10.5 to 14.00% of Cr, not greater than 0.010% of Al, not greater than 0.050% of P, not greater than 0.010% of S, 0 to 0.050% of Ti, 0 to 0.50% of V, 0 to 0.020% of Nb, not greater than 0.1% of N, and the balance being Fe and impurities, wherein the amount of Cr carbonitride precipitating at grain boundary is not greater than 5%.
Cited by (0)
No later patents cite this yet.
References (0)
No backward citations on record.