Flux cored wire with superior cracking resistant property for welding ferrite stainless steel

• US 6,547,892 B2
• Filed: 03/15/2001
• Issued: 04/15/2003
• Est. Priority Date: 03/20/2000
• Status: Expired due to Term

• Current Assignee: Hyundai Welding Co., Ltd. (Mong-seok Chung)
• Original Assignee: Hyundai Welding Co., Ltd. (Mong-seok Chung)
• Inventors: Kim, Seung-Gook
• Primary Examiner(s): Yee, Deborah
• Application Number:
  US09/808,930
• Publication Number:
  US 20010030003A1
• Time in Patent Office: 761 Days
• Field of Search: 219/137.WM, 219/145.22, 219/146.21, 420/68, 420/69, 420/70, 428/606, 148/325
• US Class Current: 148/325
• CPC Class Codes: B23K 35/0266 flux-cored
• CPC Class Codes: B23K 35/308 with Cr as next major constituent
• CPC Class Codes: C22C 38/22 with molybdenum or tungsten
• CPC Class Codes: C22C 38/26 with niobium or tantalum
• CPC Class Codes: C22C 38/28 with titanium or zirconium

Abstract

A flux cored wire for welding a ferrite stainless steel is disclosed.

The flux cored wire includes in weight %, 0.04% or less of C, 0.1˜1.0% of Si, 0.1˜1.0% of Mn, 0.02% or less of P, 0.02% or less of S, 10˜25% of Cr, 0.3˜1.5% of Ti+Nb, 0.04% or less of N, 0.04% or less of O, and a balance of Fe and other unavoidable impurities, wherein a value defined by [(O+N)×Cr] is 0.8 or less. In the flux cored wire for welding the ferrite stainless steel, a superior corrosion resistance and a superior cracking resistance are realized.

Claims

1. A flux cored wire for welding a ferrite stainless steel with the flux filled within a mild steel sheath, consisting essentially of in weight %:

0.04% or less of C, 0.1˜

1.0% of Si, 0.1˜

1.0% of Mn, 0.02% or less of P, 0.02% or less of S, 10˜

25% of Cr, 0.3˜

1.5% of Ti+Nb, 0.04% or less of N, 0.04% or less of O, and a balance of Fe and other unavoidable impurities, wherein a value defined by [(O+N)×

Cr] is 0.8 or less.

2. The flux cored wire as claimed in claim 1, wherein Mo is additionally added in an amount of 3.0% or less.