A 638 Grade 660 Type 2 (United States / ASTM) Material Properties

Material group: Ferrous Alloys / Stainless steels
Country/Standard: United States / ASTM

Data updates

Latest Update: 2020-07
Total number of updates: 2
Update History:
2018-09

Mechanical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 val1
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MPa view details
Tensile Strength 895 MPa view details
Elongation, A 15 % view details
Reduction of Area val1
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% view details
Brinell Hardness (HB) 248 view details
Grain Size val1
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view details
Yield Strength, Rp0.2 val1
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ksi view details
Tensile Strength 129.8 ksi view details
Elongation, A 15 % view details
Reduction of Area val1
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% view details
Brinell Hardness (HB) 248 view details
Grain Size val1
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view details

Physical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Modulus of Elasticity 190 — 215 GPa view details
Density 7.61 — 8.1 kg/dm³ view details
Poisson Coefficient 0.27 — 0.3 view details
Modulus of Elasticity 27.6 E+03 — 31.2 E+03 ksi view details
Density 0.275 — 0.293 lb/in³ view details
Poisson Coefficient 0.27 — 0.3 view details

Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
Al
VALUE
≤ 0.35
UNIT
%
CAS NUMBER
7429-90-5
CRITERIA
B
VALUE
0.0010 – 0.010
UNIT
%
CAS NUMBER
7440-42-8
CRITERIA
C
VALUE
≤ 0.08
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
val1
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UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
val1
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UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Ni
VALUE
val1
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UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
P
VALUE
val1
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UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
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UNIT
%
CAS NUMBER
7704-34-9
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
Ti
VALUE
val1
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UNIT
%
CAS NUMBER
7440-32-6
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2

A638/A638M: 2023 / Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service

Heat Treatments

  • Solution treatment: 980 ± 15°C (1800 ± 25°F), hold for 1 hour minimum, followed by quenching in oil or water.<br />Precipitation hardening: 705 to 760°C (1300 to 1400°F), hold for 16 hours minimum, followed by air or furnace cooling.