A 291 Grade 6 Class G (United States / ASTM) Material Properties

Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: United States / ASTM

Data updates

Latest Update: 2019-03
Total number of updates: 1
Update History:

Mechanical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 val1
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MPa view details
Tensile Strength 930 MPa view details
Elongation, A 10 % view details
Reduction of Area val1
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% view details
Impact Energy val1
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J view details
Brinell Hardness (HB) 302 — 352 view details
Yield Strength, Rp0.2 val1
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ksi view details
Tensile Strength 134.9 ksi view details
Elongation, A 10 % view details
Reduction of Area val1
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% view details
Impact Energy val1
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ft·lb view details
Brinell Hardness (HB) 302 — 352 view details

Physical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Modulus of Elasticity 190 — 210 GPa view details
Density 7.67 — 7.86 kg/dm³ view details
Poisson Coefficient 0.27 — 0.3 view details
Modulus of Elasticity 27.6 E+03 — 30.5 E+03 ksi view details
Density 0.277 — 0.284 lb/in³ view details
Poisson Coefficient 0.27 — 0.3 view details

Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.35 – 0.50
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
≥ 0.60
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Cu
VALUE
≤ 0.35
UNIT
%
CAS NUMBER
7440-50-8
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
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2

A291/A291M: 2019 / Standard Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears

Heat Treatments

  • Heated to a suitable temperature for a sufficient length of time for austenitization and shall be suitably cooled to bring about complete transformation. Forgings may be immediately treated for mechanical properties after preliminary heat treatment or they may be preliminarily machined prior to treatment for mechanical properties.<br />Forging shall be reheated to a temperature above the upper critical temperature and held a sufficient length of time for complete austenitization; air cooled.<br />Minimum tempering temperature at 565°C (1050°F); cooled in the furnace at a max. rate of 55°C (100°F) per hour to 315°C (600°F).<br />If the manufacturer elects to heat treat for mechanical properties prior to machining, the forgings shall be stress relieved after machining at a temperature that is 30 - 55°C (50 - 100°F) below the last previous tempering temperature but in no case below 540°C (1000°F); cooled under uniform conditions in the furnace at a maximum rate of 55°C ⁄hour (100°F/hour) - 315°C (600°F).