Cu-CONTAINING LOW ALLOY STEEL HAVING HIGH STRENGTH HIGH TOUGHNESS, AND MANUFACTURING METHOD THEREFOR

Title:

Cu-CONTAINING LOW ALLOY STEEL HAVING HIGH STRENGTH HIGH TOUGHNESS, AND MANUFACTURING METHOD THEREFOR

Document Type and Number:

Japanese Patent JP2019143171

Kind Code:

A

Abstract:

To provide a Cu-containing low alloy steel excellent in strength, yield ratio and low temperature toughness.SOLUTION: A Cu-containing low alloy steel has a chemical composition containing, by mass%, C:0.09 to 0.20%, Si:0.10 to 0.40%, Mn:0.80 to 1.80%, Ni:0.80 to 2.50%, Cr:0.50 to 1.00%, Cu:0.80 to 1.50%, Mo:0.20 to 0.60%, Al:0.010 to 0.050%, Nb:0.030 to 0.080%, and one or two kind of N:0.005 to 0.020% and Ca:0.010% or less, and the balance Fe with inevitable impurities with 0.2% bearing force of 620 MPa or more, yield ratio of 0.82 or less, and fracture appearance transition temperature (FATT) measured in a V notch Charpy impact test of -90°C or less.SELECTED DRAWING: Figure 1

Inventors:

HONMA YUTA
SASAKI HAJIME
HASHI KUNIHIKO

Application Number:

JP2018025564A

Publication Date:

August 29, 2019

Filing Date:

February 16, 2018

Export Citation:

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