Boron-containing stainless steel having excellent hot workability and surface property
AssigneeNippon Yakin Kogyo Co., Ltd.
InventorHidekazu Todoroki
Life of this patent
Estimating the term…
Abstract
A boron-containing stainless steel having excellent hot workability and weldability and a good surface quality is proposed and is a boron-containing stainless steel comprising C: 0.001-0.15 mass %, Si: 0.1-2 mass %, Mn: 0.1-2 mass %, Ni: 5-25 mass %, Cr: 11-27 mass %, B: 0.05-2.5 mass %, Al: 0.005-0.2 mass %, O: 0.0001-0.01 mass %, N: 0.001-0.1 mass %, S: not more than 0.005 mass %, one or both of Mg: 0.0001-0.005 mass % and Ca: 0.0001-0.005 mass % and the remainder being Fe and inevitable impurities provided that a part of Si, Al, Mg, Ca and S is included as a non-metallic inclusion made of sulfide and/or oxysulfide.
Claims2
A boron-containing stainless steel, which comprises
- C:
- 0.001-0.15 mass %,
- Si:
- 0.1-2 mass %,
- Mn:
- 0.1-2 mass %,
- Ni:
- 5-25 mass %,
- Cr:
- 11-27 mass %,
- B:
- 0.5-2.5 mass %,
- Al:
- 0.005-0.2 mass %,
- O:
- 0.0001-0.01 mass %,
- N:
- 0.001-0.1 mass %,
- S:
- not more than 0.005 mass %,
- one or both of Mg:
- 0.0001-0.005 mass % and Ca:
- 0.0001-0.005 mass % and
- the remainder being Fe and inevitable impurities,
- wherein a contained nonmetallic inclusion of CaO—Al2O3—MgO—SiO2—S series oxysulfide has a composition of
- CaO:
- 20-70 mass %,
- Al2O3:
- 5-60 mass %,
- SiO2:
- not more than 15 mass %,
- MgO:
- 0.5-30 mass % and
- S:
- not more than 15 mass %.
Dependencies are inferred from the claim text.