# US 12,006,561 B2 · Martensitic stainless steel for fuel injection member and fuel injection member using same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,006,561 B2
- Document ID: US12006561B2
- Status: Granted
- Kind: B2
- Application number: 16/315,157
- Filed: 2017-07-05
- Published: 2019-07-11
- Granted: 2024-06-11
- Earliest claimed: 2016-07-06
- Assignees: Proterial, Ltd.
- Applicants: Proterial, Ltd.
- Inventors: Toshihiro Uehara; Akihiro Toji
- Web page: https://patentgrep.com/patent/US12006561B2

## CPC

- C22C 38/54: with boron
- C22C 38/00: Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00)
- C22C 38/001: {containing N}
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/42: with copper
- C22C 38/44: with molybdenum or tungsten
- C22C 38/46: with vanadium
- C22C 38/48: with niobium or tantalum
- C22C 38/50: with titanium or zirconium
- F02M 61/166: {Selection of particular materials}
- F02M 2200/05: Fuel-injection apparatus having means for preventing corrosion
- F02M 2200/9053: Metals
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A martensitic stainless steel for a fuel injection member contains, in mass %, at least 0.35% and less than 0.50% of C, more than 0.20% and at most 0.40% of Si, 0.2-0.4% of Mn, 0.25% or less of Ni, 15.0-17.0% of Cr, more than 2.0% and at most 3.0% of Mo, 0.1-0.3% of W, 0.001-0.003% of B, and at least 0.15% and less than 0.20% of N, with the remainder comprising Fe and inevitable impurities, which include 0-0.025% of P, 0-0.005% of S, 0-0.2% of Cu, 0-0.05% of Al, 0-0.02% of Ti, 0-0.02% of Nb, 0-0.15% of V, 0-0.003% of O, and 0-0.001% of H.

## Claims

### Claim 1

A martensitic stainless steel for a fuel injection member comprising: in mass %, 0.35% or more and less than 0.50% of C, more than 0.20% and 0.40% or less of Si, 0.2 to 0.4% of Mn, more than 0.05% and 0.25% or less of Ni, 15.0 to 17.0% of Cr, more than 2.0% and 3.0% or less of Mo, 0.1 to 0.3% of W, 0.001 to 0.003% of B, and 0.15% or more and less than 0.20% of N, the remainder being Fe and inevitable impurities, wherein inevitable impurity elements being, 0.025% or less including 0% of P, 0.005% or less including 0% of S, 0.1% or less including 0% of Cu, 0.05% or less including 0% of Al, 0.02% or less including 0% of Ti, 0.02% or less including 0% of Nb, 0.15% or less including 0% of V, 0.003% or less and more than 0% of 0, and 0.001% or less and more than 0% of H.

### Claim 2 (depends on 1)

A fuel injection member that uses the martensitic stainless steel for a fuel injection member according to claim 1.

### Claim 3 (depends on 1)

The martensitic stainless steel for a fuel injection member according to claim 1, wherein the martensitic stainless steel comprises 0.0005% or less and more than 0% of H.