US 2020/0347488 A1 · Fe-Cr-Ni ALLOY AND METHOD FOR PRODUCTION THEREOF

Abstract

Ti, N, Al, Mg, and Ca concentrations are controlled in order to prevent aggregation of TiN inclusions. Furthermore, not only is a Fe—Cr—Ni alloy having superior surface property provided, but also a method is proposed in which the Fe—Cr—Ni alloy is produced at low cost using commonly used equipment. The Fe—Cr—Ni alloy includes C≤0.05%, Si: 0.1 to 0.8%, Mn: 0.2 to 0.8%, P≤0.03%, S≤0.001%, Ni:16 to 35%, Cr: 18 to 25%, Al: 0.2 to 0.4%, Ti: 0.25 to 0.4%, N≤0.016%, Mg: 0.0015 to 0.008%, Ca≤0.005%, O: 0.0002 to 0.005%, freely selected Mo: 0.5 to 2.5% in mass % and Fe and inevitable impurities as the remainder, wherein Ti and N satisfy % N×% Ti≤0.0045 and the number of TiN inclusions not smaller than 5 μm is 20 to 200 pieces/cm2 at a freely selected cross section.

Claims7

Dependent claims

Fe—Cr—Ni alloy comprising:

C≤0.05%, Si:
0.1 to 0.8%, Mn:
0.2 to 0.8%, P≤0.03%, S≤0.001%, Ni:
16 to 35%, Cr:
18 to 25%, Al:
0.2 to 0.4%, Ti:
0.25 to 0.4%, N≤0.016%, Mg:
0.0015 to 0.008%, Ca≤0.005%, O:
0.0002 to 0.005%, arbitrary Mo:
0.5 to 2.5% in mass % and Fe and inevitable impurities as the remainder,
wherein Ti and N satisfy % N×% Ti≤0.0045 and the number of TiN inclusions not smaller than 5 μm is 20 to 200 pieces/cm2 at a freely selected cross section, and
the alloy contains CaO—MgO—Al2O3 as an oxide type inclusion as a necessary component, contains one or more kinds selected from MgO.Al2O3, MgO and CaO as a freely selected component, and ratio of numbers of MgO and CaO is not more than 50%.

9 more elements

Dependencies are inferred from the claim text.

Fe-Cr-Ni ALLOY AND METHOD FOR PRODUCTION THEREOF

Life of this patent

Fe-Cr-Ni ALLOY AND METHOD FOR PRODUCTION THEREOF

Life of this patent

Abstract

Claims7