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Title: Secondary hardening steel having improved combination of hardness and toughness

Abstract

A secondary hardening alloy steel composition consisting essentially of about 0.25-0.5% carbon, about 0.5-1.0% manganese, about 1.5-3.0% nickel, about 0-1.0% chromium, about 1.75-2.5% molybdenum, about 0-0.4% vanadium, and an additive selected from about 1-3% aluminum and a combination of at least about 1% aluminum and at least about 1% silicon for a combined Al+Si content of about 2-4%, the balance being iron and impurity elements. The present steel composition has the following characteristics: it exhibits a flat tempering response, it is hardenable upon tempering to a Rockwell C hardness of at least 50, and it has an improved combination of hardness vs. toughness properties after tempering in the secondary hardening range. A method of preparation is also described.

Inventors:
 [1];  [2];  [2];  [3]
  1. San Leandro, CA
  2. Berkeley, CA
  3. (Oakland, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
863388
Patent Number(s):
4162157
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
secondary; hardening; steel; improved; combination; hardness; toughness; alloy; composition; consisting; essentially; 25-0; carbon; 5-1; manganese; 5-3; nickel; 0-1; chromium; 75-2; molybdenum; 0-0; vanadium; additive; selected; 1-3; aluminum; silicon; combined; content; 2-4; balance; iron; impurity; elements; following; characteristics; exhibits; flat; tempering; response; hardenable; rockwell; 50; vs; properties; range; method; preparation; described; additive selected; composition consisting; steel composition; consisting essentially; alloy steel; secondary hardening; /420/

Citation Formats

Parker, Earl R, Zackay, Victor F, Bhat, Manjeshwar S, and Garrison, Jr., Warren M. Secondary hardening steel having improved combination of hardness and toughness. United States: N. p., 1979. Web.
Parker, Earl R, Zackay, Victor F, Bhat, Manjeshwar S, & Garrison, Jr., Warren M. Secondary hardening steel having improved combination of hardness and toughness. United States.
Parker, Earl R, Zackay, Victor F, Bhat, Manjeshwar S, and Garrison, Jr., Warren M. Mon . "Secondary hardening steel having improved combination of hardness and toughness". United States. https://www.osti.gov/servlets/purl/863388.
@article{osti_863388,
title = {Secondary hardening steel having improved combination of hardness and toughness},
author = {Parker, Earl R and Zackay, Victor F and Bhat, Manjeshwar S and Garrison, Jr., Warren M.},
abstractNote = {A secondary hardening alloy steel composition consisting essentially of about 0.25-0.5% carbon, about 0.5-1.0% manganese, about 1.5-3.0% nickel, about 0-1.0% chromium, about 1.75-2.5% molybdenum, about 0-0.4% vanadium, and an additive selected from about 1-3% aluminum and a combination of at least about 1% aluminum and at least about 1% silicon for a combined Al+Si content of about 2-4%, the balance being iron and impurity elements. The present steel composition has the following characteristics: it exhibits a flat tempering response, it is hardenable upon tempering to a Rockwell C hardness of at least 50, and it has an improved combination of hardness vs. toughness properties after tempering in the secondary hardening range. A method of preparation is also described.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

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