High-nitrogen austenitic stainless steel
First Claim
Patent Images
1. A high-nitrogen austenitic stainless steel having a Fe content of 50% by mass or more, and containing:
- Cr;
15.0% by mass to 35.0% by mass;
Mo;
0.05% by mass to 8.0% by mass;
Mn;
0.2% by mass to 10.0% by mass;
Cu;
0.01% by mass to 4.0% by mass; and
N;
0.8% by mass to 1.5% by mass, both ends inclusive, having a C content of 0.20% by mass or less, a Si content of 2.0% by mass or less, a P content of 0.03% by mass or less, a S content of 0.05% by mass or less, a Ni content of 0.5% by mass or less, an Al content of 0.03% by mass or less, and an 0 content of 0.020% by mass or less;
wherein the contents of Cr, Mo, N and Mn are adjusted so that a compositional parameter □
expressed by the equation;
□
≡
(WCr+3.3WMo+16WN)/WMn where WCr is Cr content (% by mass), WMo is Mo content (% by mass), WN is N content (% by mass) and WMn is Mn content (% by mass) has a value of 5 or above;
and optionally further containing either one of, or both of;
W;
0.01% by mass to 1.0% by mass; and
Co;
0.01% by mass to 5.0% by mass, both ends inclusive;
and optionally further containing at least one of;
Ti;
0.01% by mass to 0.5% by mass;
Nb;
0.01% by mass to 0.5% by mass;
V;
0.01% by mass to 1.0% by mass; and
Ta;
0.01% by mass to 0.5% by mass, both ends inclusive;
and optionally further containing at least one of;
B;
0.001% by mass to 0.01% by mass;
Zr;
0.01% by mass to 0.50% by mass;
Ca;
0.001% by mass to 0.01% by mass; and
Mg;
0.001% by mass to 0.01% by mass, both ends inclusive;
and optionally further containing either one of, or both of;
Te;
0.005% by mass to 0.05% by mass; and
Se;
0.01% by mass to 0.20% by mass, both ends inclusive.
1 Assignment
0 Petitions
Accused Products
Abstract
This invention provides a high-nitrogen austenitic stainless steel superior to the conventional one both in the corrosion resistance and strength, despite a low Ni content, characterized in having a Fe content of 50% by mass or more; containing Cr: 15.0% by mass to 35.0% by mass, Mo: 0.05% by mass to 8.0% by mass %, Mn: 0.2% by mass to 10.0% by mass, Cu: 0.01% by mass to 4.0% by mass and N: 0.8% by mass to 1.5% by mass, both ends inclusive, having a C content of 0.20% by mass or less, a Si content of 2.0% by mass or less, a P content of 0.03% by mass or less, a S content of 0.05% by mass or less, a Ni content of 0.5% by mass or less, an Al content of 0.03% by mass or less, and an 0 content of 0.020% by mass or less; wherein the contents of Cr, Mo, N and Mn are adjusted so that a compositional parameter η expressed by the equation:
η≡(WCr+3.3WMo+16WN)/WMn
- where WCr is Cr content (% by mass), WMo is Mo content (% by mass) WN is N content (% by mass) and WMn is Mn content (% by mass) has a value of 5 or above. and optionally further containing either one of, or both of: W: 0.01% by mass to 1.0% by mass; and Co: 0.01% by mass to 5.0% by mass, both ends inclusive; and optionally further containing at least one of: Ti: 0.01% by mass to 0.5% by mass; Nb: 0.01% by mass to 0.5% by mass; V: 0.01% by mass to 1.0% by mass; and Ta: 0.01% by mass to 0.5% by mass, both ends inclusive; and optionally further containing at least one of: B: 0.001% by mass to 0.01% by mass; Zr: 0.01% by mass to 0.50% by mass; Ca: 0.001% by mass to 0.01% by mass; and Mg: 0.001% by mass to 0.01% by mass, both ends inclusive; and optionally further containing either one of, or both of: Te: 0.005% by mass to 0.05% by mass; and Se: 0.01% by mass to 0.20% by mass, both ends inclusive.
-
Citations
7 Claims
-
1. A high-nitrogen austenitic stainless steel having a Fe content of 50% by mass or more, and containing:
-
Cr;
15.0% by mass to 35.0% by mass;
Mo;
0.05% by mass to 8.0% by mass;
Mn;
0.2% by mass to 10.0% by mass;
Cu;
0.01% by mass to 4.0% by mass; and
N;
0.8% by mass to 1.5% by mass,both ends inclusive, having a C content of 0.20% by mass or less, a Si content of 2.0% by mass or less, a P content of 0.03% by mass or less, a S content of 0.05% by mass or less, a Ni content of 0.5% by mass or less, an Al content of 0.03% by mass or less, and an 0 content of 0.020% by mass or less;
wherein the contents of Cr, Mo, N and Mn are adjusted so that a compositional parameter □
expressed by the equation;
□
≡
(WCr+3.3WMo+16WN)/WMnwhere WCr is Cr content (% by mass), WMo is Mo content (% by mass), WN is N content (% by mass) and WMn is Mn content (% by mass) has a value of 5 or above;
and optionally further containing either one of, or both of;
W;
0.01% by mass to 1.0% by mass; and
Co;
0.01% by mass to 5.0% by mass,both ends inclusive;
and optionally further containing at least one of;
Ti;
0.01% by mass to 0.5% by mass;
Nb;
0.01% by mass to 0.5% by mass;
V;
0.01% by mass to 1.0% by mass; and
Ta;
0.01% by mass to 0.5% by mass,both ends inclusive;
and optionally further containing at least one of;
B;
0.001% by mass to 0.01% by mass;
Zr;
0.01% by mass to 0.50% by mass;
Ca;
0.001% by mass to 0.01% by mass; and
Mg;
0.001% by mass to 0.01% by mass,both ends inclusive;
and optionally further containing either one of, or both of;
Te;
0.005% by mass to 0.05% by mass; and
Se;
0.01% by mass to 0.20% by mass,both ends inclusive. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeDaido Tokushuko Kabushiki Kaisha
-
Original AssigneeDaido Tokushuko Kabushiki Kaisha
-
InventorsShimizu, Tetsuya, Noda, Toshiharu, Hamano, Shuji
-
Application NumberUS11/201,314Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current420/39CPC Class CodesC21D 6/002 containing Cr C21D6/004 tak...C21D 6/005 containing MnC21D 8/065 of ferrous alloysC22C 38/001 containing NC22C 38/002 containing In, Mg, or other...C22C 38/02 containing siliconC22C 38/04 containing manganeseC22C 38/20 with copperC22C 38/22 with molybdenum or tungstenC22C 38/38 with more than 1.5% by weig...C22C 38/42 with copperC22C 38/44 with molybdenum or tungstenC22C 38/46 with vanadiumC22C 38/48 with niobium or tantalumC22C 38/52 with cobaltC22C 38/58 with more than 1.5% by weig...C22C 38/60 containing lead, selenium, ...
