Low-alloy steel, plate and welded pipe resistant to carbon dioxide and microorganism corrosion, and manufacturing method therefor

Abstract

The present application discloses a low alloy steel, comprising, in addition to Fe and inevitable impurities, the following chemical elements in percentage by mass: C: 0.02-0.1%, Si: 0.1-1.5%, Mn: 0.10-1.8%, Cr: 1.0-5.5%, Ni: 0.3-3.0%, Cu: 0.3-4.8%, Mo: 0.10-2.5%, V: 0.01-0.2%, Al: 0.01-0.1%, REM: 0.1-1.0%. The low alloy steel of the present disclosure has good resistance to carbon dioxide and microbiologically caused corrosion and is suitable for working environments where microbiologically caused corrosion and CO2 corrosion coexist. In addition, the present application discloses a plate and a welded pipe made from the low alloy steel, and methods for manufacturing the plate and welded pipe.

Dependencies are inferred from the claim text.