MIL-DTL-15119B(OS)
TABLE I. Chemical composition.
Grade
4130
8630
Element
Check Analysis
Check Analysis
Analysis (%)
Analysis (%)
Tolerance (%)
Tolerance (%)
0.27 0.33
0.27 0.33
Carbon
±0.02
±0.02
0.40 0.60
0.70 0.90
Manganese
±0.03
±0.03
Phosphorous
0.025 (max.)
±0.005
0.025 (max.)
±0.005
Sulfur
0.025 (max.)
±0.005
0.025 (max.)
±0.005
0.20 0.35
0.20 0.35
Silicon
±0.02
±0.02
0.40 0.70
Nickel
±0.03
0.80 1.10
0.40 0.60
Chromium
+0.05, -0.03
±0.03
0.15 0.25
0.15 0.25
Molybdenum
±0.02
±0.03
NOTE:
Individual determinations may vary from the specified range to the extent shown in the check analysis
1.
column except that elements in any heat shall not vary both above and below specified range. The average
of all separate determinations shall be within the specified range.
3.3 Grain size (M103). The grain size of the steel used for this tubing shall be predominately No. 5 or finer
with grains as large as No. 3 permissible. The grain size shall be determined in accordance with 4.5.
3.4 Mechanical properties (M104). After the last cold draw pass, the tubing shall be heat treated in accordance
with SAE-AMS-H-6875 to produce the mechanical properties listed in table II. Mechanical properties shall be
verified in accordance with 4.6.
TABLE II. Mechanical properties.
Tensile Strength
Yield Strength at 0.2% Offset
Elongation in 2 Inches Full Tube
(PSI)
(PSI)
Specimen (%)
110,000 130,000
85,000 120,000
12 22
3.5 Dimensions (M105). The tubing dimensions shall be as specified (see 6.2). Dimensions shall be verified in
accordance with 4.7.
3.6 Tolerances (M106). Unless otherwise specified (see 6.2), the permissible variations in dimensions shall be
as specified in SAE-AMS2253. Tolerances shall be verified in accordance with 4.8.
3.7 Hydrostatic test (C1). The tubing shall not break or permanently increase in diameter more than
3.8 Marking. All tubing shall be marked in accordance with SAE-AMS2806 and SAE-AMS2807. Marking
shall be verified in accordance with 4.10.
3
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