Secondary hardening steel having improved combination of hardness and toughness

Patent · Mon Jan 01 00:00:00 EST 1979

OSTI ID:863388

Parker, Earl R ^[1]; Zackay, Victor F ^[2]; Bhat, Manjeshwar S ^[2]

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1. San Leandro, CA
2. Berkeley, CA

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.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4162157
• OSTI ID: 863388
• Country of Publication: United States
• Language: English

Related Subjects

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
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