MIL-DTL-12560K (MR)
TABLE I. Chemical composition and precision (product analysis) 6/.
5/
COLUMN A
COLUMN B
MAXIMUM LIMIT for
ALLOWABLE RANGE for
DECLARED CHEMISTRY
ELEMENT
FUTURE PRODUCTION
(WEIGHT PERCENT)
LOTS (WEIGHT PERCENT)
0.27 up to 2" thick, incl
Carbon
0.29 over 2" up to 4"
± 0.05
0.31 over 4"
NONE REQUIRED, HOWEVER IF:
< 1.00
Manganese
± 0.15
> 1.00
± 0.20
0.020 1/
4/
Phosphorus
0.010 1/
4/
Sulfur
NONE REQUIRED, HOWEVER IF:
Silicon
< 0.60
± 0.10
> 0.60 to < 1.00
± 0.15
> 1.00
± 0.20
NONE REQUIRED 3/
Nickel
± 0.25
NONE REQUIRED, HOWEVER IF:
Chromium
< 1.25 3/
± 0.15
> 1.25
± 0.25
NONE REQUIRED, HOWEVER IF:
Molybdenum
< 0.20 3/
± 0.035
> 0.20
± 0.075
3/
Vanadium
± 0.05
NONE REQUIRED
3/
Niobium
± 0.05
NONE REQUIRED
--- 2/
4/
Boron
0.25 3/
4/
Copper
0.03 3/
4/
Nitrogen
0.10 3/
4/
Titanium
0.10 3/
4/
Aluminum
0.01 3/
4/
Lead
0.02 3/
4/
Tin
1/
Phosphorus and sulfur total shall not exceed 0.020 wt%.
2/
When the amount of boron is specified in the alloy, its content as determined by heat analysis shall not exceed
0.003 percent.
3/
When the amount of an element is less than 0.02 percent the analysis may be reported as [ < 0.02 wt%].
4/
There are no limits on the allowable values for future lots; however, the values may not exceed those listed as the
maximum limit.
5/
Values are actual tolerance limits NOT percent tolerances.
6/
Elements not listed in Table, but intentionally added, shall be reported.
5
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