Inexpensive automotive member and feed oil pipe, exhibiting excellent salt corrosion resistance

Patent metadata

Field	Value
Publication number	US-9963767-B2
Application number	US-201415021078-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Sep 13, 2013
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

An automotive member or a feed oil pipe includes: a member made of a ferritic stainless steel containing predetermined components containing 10.5% to 18.0% of Cr in mass %; a metal fitting made of an aluminized stainless steel sheet, the metal fitting being attached to the member; and a gap structure defined between the member and the metal fitting, the gap structure being exposed to a chloride environment, where the metal fitting has an Al-plating weight per unit area of 20 g/m 2 or more and 150 g/m 2 or less on a surface corresponding to a gap of the gap structure, and surfaces of the metal fitting and the non-aluminized member other than the gap are coated with a cation electrodeposition coating film having a thickness of 5 μm to 35 μm.

First claim

The invention claimed is:

1. An automotive member, comprising:
a non-aluminized member;
a metal fitting made of an aluminized stainless steel sheet, the metal fitting being attached to the non-aluminized member by welding or brazing; and
a gap structure defined between the member and the metal fitting, the gap structure being exposed to a chloride environment,
wherein the non-aluminized member is made of a ferritic stainless steel comprising, in mass %, at most 0.015% of C, at most 0.015% of N, 10.5% to 18.0% of Cr, 0.01% to 0.80% of Si, 0.01% to 0.80% of Mn, at most 0.050% of P, at most 0.010% of S, 0.010% to 0.100% of Al, at most 0.30% of Ti, and at most 0.30% of Nb, one or both of Ti and Nb being at least 0.03%, and a balance in a form of Fe and inevitable impurities,
the aluminized stainless steel sheet for the metal fitting has an Al-plating weight per unit area of 20 g/m 2 or more and 150 g/m 2 or less, and
the metal fitting and the non-aluminized member are coated with a cation electro-deposition coating film having a thickness of 5 μm to 35 μm.

2. The automotive member according to claim 1 , further comprising, in mass %, one or both of 0.0002% to 0.0050% of B and 0.01% to 0.50% of Sn.

3. The automotive member according to claim 1 , further comprising, in mass %, one or more of 0.01% to 0.3% of Mo, 0.01% to 0.5% of Cu, 0.01% to 0.5% of Ni, 0.005% to 0.5% of Sb, 0.005% to 0.5% of Zr, 0.005% to 0.5% of Co, 0.005% to 0.5% of W, 0.03% to 0.5% of V, and 0.001% to 0.05% of Ga.

4. The automotive member according claim 1 , wherein a composition of a material of the metal fitting has the same composition range as a composition of the non-aluminized member.

5. A feed oil pipe, comprising:
a non-aluminized steel pipe member;
a metal fitting made of an aluminized stainless steel sheet, the metal fitting being attached to an outer circumferential surface of the non-aluminized steel pipe member by welding or brazing at a position not in contact with a fuel; and
a gap structure defined between the non-aluminized steel pipe member and the metal fitting, the gap structure being exposed to a chloride environment,
wherein the non-aluminized steel pipe member is made of a ferritic stainless steel comprising, in mass %, at most 0.015% of C, at most 0.015% of N, 10.5% to 18.0% of Cr, 0.01% to 0.80% of Si, 0.01% to 0.80% of Mn, at most 0.050% of P, at most 0.010% of S, 0.010% to 0.100% of Al, at most 0.30% of Ti, and at most 0.30% of Nb, one or both of Ti and Nb being at least 0.03%, and a balance in a form of Fe and inevitable impurities,
the aluminized stainless steel sheet for the metal fitting has an Al-plating weight per unit area of 20 g/m 2 or more and 150 g/m 2 or less, and
the metal fitting and the non-aluminized steel pipe member are coated with a cation electro-deposition coating film having a thickness of 5 μm to 35 μm.

6. The feed oil pipe according to claim 5 , further comprising, in mass %, one or both of 0.0002% to 0.0050% of B and 0.01% to 0.50% of Sn.

7. The feed oil pipe according to claim 5 , further comprising, in mass %, one or more of 0.01% to 0.3% of Mo, 0.01% to 0.5% of Cu, 0.01% to 0.5% of Ni, 0.005% to 0.5% of Sb, 0.005% to 0.5% of Zr, 0.005% to 0.5% of Co, 0.005% to 0.5% of W, 0.03% to 0.5% of V, and 0.001% to 0.05% of Ga.

8. The feed oil pipe according to claim 5 , wherein a composition of a material of the metal fitting has the same composition range as a composition of the steel pipe member.

9. The feed oil pipe according to claim 5 , wherein an oil inlet structure is defined, in which the steel pipe member is an inlet pipe, the metal fitting is a truncated cone member that is attached to an outer periphery of the steel pipe member with a small-diameter base of the truncated cone at a position 5 mm or more apart from an end of the inlet pipe.

10. An automotive member comprising:
a non-aluminized member;
a metal fitting made of an aluminized stainless steel sheet, the metal fitting being attached to the non-aluminized member; and
a gap structure defined between the non-aluminized member and the metal fitting, the gap structure being exposed to a chloride environment,
wherein the non-aluminized member is made of a ferritic stainless steel containing, in mass %, at most 0.015% of C, at most 0.015% of N, 10.5% to 18.0% of Cr, 0.01% to 0.80% of Si, 0.01% to 0.80% of Mn, at most 0.050% of P, at most 0.010% of S, 0.010% to 0.100% of Al, at most 0.30% of Ti, and at most 0.30% of Nb, one or both of Ti and Nb being at least 0.03%, and a balance in a form of Fe and inevitable impurities,
the aluminized stainless steel sheet for the metal fitting has an Al-plating weight per unit area of 20 g/m 2 or more and 150 g/m 2 or less on a surface abutting on a gap defined between the gap structure and the metal fitting, and
the metal fitting and the non-aluminized member not abutting on the gap are coated with a cation electro-deposition coating film having a thickness of 5 μm to 35 μm.

11. The automotive member according to claim 10 , wherein a composition of a material of the metal fitting has the same composition range as a composition of the non-aluminized member.

12. The automotive member according to claim 10 , further comprising, in mass %, one or both of 0.0002% to 0.0050% of B and 0.01% to 0.50% of Sn.

13. The automotive member according to claim 12 , further comprising, in mass %, one or more of 0.01% to 0.3% of Mo, 0.01% to 0.5% of Cu, 0.01% to 0.5% of Ni, 0.005% to 0.5% of Sb, 0.005% to 0.5% of Zr, 0.005% to 0.5% of Co, 0.005% to 0.5% of W, 0.03% to 0.5% of V, and 0.001% to 0.05% of Ga.

14. The automotive member according to claim 12 , wherein a composition of a material of the metal fitting has the same composition range as a composition of the non-aluminized member.

15. The automotive member according to claim 10 , further comprising, in mass %, one or more of 0.01% to 0.3% of Mo, 0.01% to 0.5% of Cu, 0.01% to 0.5% of Ni, 0.005% to 0.5% of Sb, 0.005% to 0.5% of Zr, 0.005% to 0.5% of Co, 0.005% to 0.5% of W, 0.03% to 0.5% of V, and 0.001% to 0.05% of Ga.

16. The automotive member according to claim 15 , wherein a composition of a material of the metal fitting has the same composition range as a composition of the non-aluminized member.

17. A feed oil pipe, comprising:
a non-aluminized steel pipe member;
a metal fitting made of an aluminized stainless steel sheet, the metal fitting being attached to the steel pipe member; and
a gap structure defined between a position on an outer circumferential surface of the non-aluminized steel pipe member not in contact with a fuel and the metal fitting, the gap structure being exposed to a chloride environment,
wherein the non-aluminized member is made of a ferritic stainless steel containing, in mass %, at most 0.015% of C, at most 0.015% of N, 10.5% to 18.0% of Cr, 0.01% to 0.80% of Si, 0.01% to 0.80% of Mn, at most 0.050% of P, at most 0.010% of S, 0.010% to 0.100% of Al, at most 0.30% of Ti, and at most 0.30% of Nb, one or both of Ti and Nb being at least 0.03%, and a balance in a form of Fe and inevitable impurities,
the aluminized stainless steel sheet for the metal fitting has an Al-plating weight per unit area of 20 g/m 2 or more and 150 g/m 2 or less on a surface abutting on a gap defined between the gap structure and the metal fitting, and
the metal fitting and the non-aluminized member not abutting on the gap are coated with a cation electro-deposition coating film having a thickness of 5 μm to 35 μm.

18. The feed oil pipe according to claim 17 , wherein an oil inlet stru

Assignees

• Nippon Steel & Sumikin Sst

Inventors

• Urashima Hiroshi
• Sakamoto Shunji
• Teraoka Shinichi
• Tanoue Toshio

Classifications

• B60K2015/0346

  by welding · CPC title

• C22C38/50 Primary

  with titanium or zirconium · CPC title

• C22C38/02

  containing silicon · CPC title

• C25D13/12

  characterised by the article coated · CPC title

• C22C38/48

  with niobium or tantalum · CPC title