Document Type and Number:
Japanese Patent JPWO2021141107
Kind Code:
A1
Abstract:
An austenitic stainless steel material is provided that has high creep strength even when used at an average operation temperature of more than 600 to 750°C after welding with higher heat input, and furthermore, has excellent stress relaxation cracking resistance even after use for a long time period at an average operation temperature of more than 600 to 750°C after welding with higher heat input. The steel material of the present disclosure has a chemical composition which consists of, in mass%, C: 0.030% or less, Si: 1.50% or less, Mn: 2.00% or less, P: 0.045% or less, S: 0.0300% or less, Cr: 15.00 to 25.00%, Ni: 8.00 to 20.00%, N: 0.050 to 0.250%, Nb: 0.10 to 1.00%, Mo: 0.05 to 5.00%, and B: 0.0005 to 0.0100%, with the balance being Fe and impurities, and a ratio of the dissolved N amount (mass%) with respect to the content of N (mass%) in the steel material is 0.40 to 0.90.
Application Number:
JP2021570104A
Publication Date:
July 15, 2021
Filing Date:
January 08, 2021
Export Citation:
Domestic Patent References:
| JP2017008413A | 2017-01-12 | |||
| JP2021021093A | 2021-02-18 |
Foreign References:
| WO2018043565A1 | 2018-03-08 | |||
| WO2018181570A1 | 2018-10-04 | |||
| WO2021015283A1 | 2021-01-28 |