HIGH ALLOY FOR OIL WELL USE - NIPPON STEEL & SUMITOMO METAL CORP

Title:

HIGH ALLOY FOR OIL WELL USE

Document Type and Number:

WIPO Patent Application WO/2015/118866

Kind Code:

A1

Abstract:

　Provided is a high alloy for oil well use, having high strength and exceptional hot workability and SCC resistance. This high alloy for oil well use contains, expressed in mass%, C: 0.03% or less, Si: 1.0% or less, Mn: 0.05-1.5%, P: 0.03% or less, S: 0.03% or less, Ni: 26.0-40.0%, Cr: 22.0-30.0%, Mo: at least 0.01% but less than 5.0%, Cu: 0.1-3.0%, Al: 0.001-0.30%, N: more than 0.05% but not more than 0.30%, O: 0.010% or less, Ag: 0.005-1.0%, Ca: 0-0.01%, Mg: 0-0.01%, and rare earth elements: 0-0.2%, with the remainder comprising Fe and impurities. The alloy satisfies the following expression (1) and expression (2), and has yield strength of 758 MPa or above. 5 × Cu + (1,000 × Ag) 2 ≧ 40 (1) Cu + 6 × Ag - 500 × (Ca + Mg + REM) ≦ 3.5 (2) Here, the contained amounts (in mass%) are substituted for the element symbols in the expressions.

Inventors:

SAGARA MASAYUKI (JP)
TOMIO AKIKO (JP)

Application Number:

PCT/JP2015/000507

Publication Date:

August 13, 2015

Filing Date:

February 05, 2015

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

C22C38/00; C22C30/02; C22C38/44; C21D6/00

Foreign References:

JPH11189848A	1999-07-13
JP2009030153A	2009-02-12

Other References: