Duplex ferritic austenitic stainless steel
US-2016115574-A1 · Apr 28, 2016 · US
Method for manufacturing duplex stainless steel sheet having reduced inclusions
US9869002B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9869002-B2 |
| Application number | US-201514962424-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 8, 2015 |
| Priority date | Dec 11, 2014 |
| Publication date | Jan 16, 2018 |
| Grant date | Jan 16, 2018 |
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Abstract
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There is provided a method for manufacturing a duplex stainless steel sheet having reduced inclusions through argon oxygen decarburization (AOD), ladle treatment (LT), and twin roll strip casting. The method includes deoxidizing molten steel using silicon (Si) during the AOD, wherein the molten steel has a silicon (Si) content of 0.55 wt % to 0.75 wt % at the end of the AOD.
First claim
Opening claim text (preview).
What is claimed is: 1. A method for manufacturing a duplex stainless steel sheet, the method comprising: argon oxygen decarburization (AOD), ladle treatment (LT), and twin roll strip casting, wherein the AOD comprises: deoxidizing molten steel with silicon (Si), wherein the molten steel has a silicon (Si) content of 0.55 wt % to 0.75 wt % at an end of the AOD, and wherein the duplex stainless steel sheet comprises, by wt %, carbon (C): 0.02% to 0.06%, silicon (Si): 0.55% to 0.75%, manganese (Mn): 2.8% to 3.2%, phosphorus (P): 0.035% or less, sulfur (S): 0.003% or less, chromium (Cr): 19.0% to 21.0%, nickel (Ni): 0.5% to 1.5%, copper (Cu): 0.3% to 1.2%, nitrogen (N): 0.2% to 0.28%, and a balance of iron (Fe) and inevitable impurities. 2. The method of claim 1 , wherein in the AOD, slag has a basicity of 2.2 to 2.5. 3. The method of claim 1 , wherein the molten steel has a tapping temperature of 1680° C. to 1710° C. in the AOD.
Assignees
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Classifications
- C21C7/06Primary
Deoxidising, e.g. killing · CPC title
of stainless steel · CPC title
with more than 1.5% by weight of manganese · CPC title
Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal · CPC title
containing N · CPC title
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- What does patent US9869002B2 cover?
- There is provided a method for manufacturing a duplex stainless steel sheet having reduced inclusions through argon oxygen decarburization (AOD), ladle treatment (LT), and twin roll strip casting. The method includes deoxidizing molten steel using silicon (Si) during the AOD, wherein the molten steel has a silicon (Si) content of 0.55 wt % to 0.75 wt % at the end of the AOD.
- Who is the assignee on this patent?
- Posco
- What technology area does this patent fall under?
- Primary CPC classification C21C7/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jan 16 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).