Duplex stainless steel with high corrosion resistance

• US 6,048,413 A
• Filed: 04/28/1997
• Issued: 04/11/2000
• Est. Priority Date: 05/21/1994
• Status: Expired due to Fees

• Current Assignee: Yong Soo Park, Young Sik Kim
• Original Assignee: Yong Soo Park, Young Sik Kim
• Inventors: Kim, Young Sik, Park, Yong Soo
• Primary Examiner(s): Yee, Deborah
• Application Number:
  US08/819,176
• Time in Patent Office: 1,079 Days
• Field of Search: 148/325, 148/327, 420/67, 420/68, 420/69
• US Class Current: 148/325
• CPC Class Codes: C22C 38/44 with molybdenum or tungsten
• CPC Class Codes: C22C 38/58 with more than 1.5% by weight of manganese

Abstract

A corrosion resistant duplex stainless steel having an austenite-ferrite duplex phase matrix, less content of the expensive nickel and higher the resistance to both stress corrosion cracking and pitting in environments containing chloride ion is disclosed. The stainless steel is also scarcely influenced by the aging heat treatment. This stainless steel includes 20-30 wt % chromium, 3-9 wt % nickel, 3-8 wt % molybdenum, 0.20 wt % or less carbon, 0.5-2.0% silicon, 3.5 wt % or less manganese, 0.2-0.5% nitrogen and a balance of iron. The stainless steel may include at least one element selected from the group of 1.5 wt % or less titanium, 3 wt % or less tungsten, 2 wt % or less copper, and 2 wt % or less vanadium and include at least one element selected from the group of 0.001-0.01 wt % boron, 0.001-0.1 wt % magnesium, 0.001-0.1 wt % calcium, and 0.001-0.2 wt % aluminum.

Claims

1. A corrosion resistant duplex phase stainless steel consisting essentially of:

20-30 wt % chromium, 3-8.5 wt % nickel, 5.1-8 wt % molybdenum, 0.20 wt % or less carbon, 0.5-2.0 wt % silicon, 3.5 wt % or less manganese, 0.25-0.5 wt % nitrogen and the balance iron.

2. The stainless steel according to claim 1, further comprising:

at least one element selected from the group of 1.5 wt % or less titanium, 3 wt % or less tungsten, 2 wt % or less copper, and 2 wt % or less vanadium.

3. The stainless steel according to claim 1, further comprising:

at least one element selected from the group of 0.001-0.01 wt % boron, 0.001-0.1 wt % magnesium, 0.001-0.1 wt % calcium, and 0.001-0.2 wt % aluminum.

4. The stainless steel according to claim 2, further comprising:

at least one element selected from the group of 0.001-0.01 wt % boron, 0.001-0.1 wt % magnesium, 0.001-0.1 wt % calcium, and 0.001-0.2 wt % aluminum.