FERRITIC STAINLESS STEEL WITH EXCELLENT BRAZEABILITY

• US 20100272594A1
• Filed: 12/24/2008
• Published: 10/28/2010
• Est. Priority Date: 12/28/2007
• Status: Abandoned Application

• Current Assignee: Nippon Steel & Sumikin Stainless Steel Corporation (Nippon Steel Corporation)
• Original Assignee: Nippon Steel & Sumikin Stainless Steel Corporation (Nippon Steel Corporation)
• Inventors: Hiraide, Nobuhiko
• Application Number:
  US12/735,156
• Publication Number:
  US 20100272594A1
• Time in Patent Office: Days
• US Class Current: 420/41
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: C22C 38/04 containing manganese
• CPC Class Codes: C22C 38/26 with niobium or tantalum
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

This ferritic stainless steel with excellent brazeability includes, in terms of mass percent, 0.03% or less of C, 0.05% or less of N, 0.015% or more of C+N, 0.02 to 1.5% of Si, 0.02 to 2% of Mn, 10 to 22% of Cr, 0.03 to 1% of Nb, and 0.5% or less of Al, and further includes Ti in a content that satisfies the following formulae (1) and (2), with the remainder composed of Fe and unavoidable impurities.

Ti—3N≦0.03  (1)

10(Ti—3N)+Al≦0.5  (2)

(Here, the atomic symbols in formulae (1) and (2) indicate the content (mass %) of the respective element, and the numerical values that precede the atomic symbols are constants.)

Claims

1. A ferritic stainless steel with excellent brazeability comprising, in terms of mass percent, 0.03% or less of C, 0.05% or less of N, 0.015% or more of C+N, 0.1 to 1.5% of Si, 0.02 to 2% of Mn, 13.15 to 22% of Cr, 0.03 to 1% of Nb, and 0.5% or less of Al, and further comprising Ti in a content that satisfies the following formulae (1) and (2), with the remainder composed of Fe and unavoidable impurities.

Ti—

3N≦

0.03 

 

(1)

10(Ti—

3N)+Al≦

0.5 

 

(2)

(Here, the atomic symbols in formulae (1) and (2) indicate the content (mass %) of the respective element, and the numerical values that precede the atomic symbols are constants.)

2. The ferritic stainless steel with excellent brazeability according to claim 1, which further comprises one or more selected from the group consisting of, in terms of mass %, 3% or less of Mo;

3% or less of Ni;

3% or less of Cu;

3% or less of V; and

5% or less of W.

3. The ferritic stainless steel with excellent brazeability according to claim 1 or 2, which further comprises one or more selected from the group consisting of, in terms of mass %, 0.002% or less of Ca;

0.002% or less of Mg; and

0.005% or less of B.