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MIL-S-81054A(OS)
Required tests for each grade of steel,
TABLE I.
Forgings
Tests
Bars
Grade C
Grade B
Grade A
x
x
x
Chemical
x
Ultrasonic
x
x
x
x
Magnetic particle
x
x
x
Grain flow
x
Impact
x
x
x
x
Grain size
Decarburization
x
x
x
x
Inclusion rating
x
x
x
x
x
Hardenability
Tensile
x
x
x
x
Macroetch test
x
x
TABLE II.
Chemical composition of steel.
Element
Percent by weight
I
0.33 -
0,38
0,02
Carbon
0.02
Manganese
0,03
0,60 -
0.03
0,85
Silicon
0,05
0.40 -
0060
0.05
Chromium
0,03
0,65 -
0.90
0.03
Nickel
1,65 -
0,05
2,00
0.05
Molybdenum
0,02
0,30 -
0,40
0,02
Vanadium
0,02
0,17 -
0,23
0,02
l
0.010 Max.
(comp A)
Sulphur
0.005
0.025 Max.
(comp B) l
Phosphorous
0.025 Max.
(comp A)
06005
0,005
0,025 Max.
(comp B)
`Sulphur plus phosphorus shall be 0.025 percent maximum.
3.3.1,4 Condition.
* 3.3.1.4,1 Condition A.  Condition A steel shall be annealed to a
maximum hardness of Rockwell 241 HB (100 HRB), in accordance with
ASTM E 9.
5

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