TABLE 1-AUTHORIZED MATERIALS
Designation | AISI 4130 (percent) |
Carbon | 0.28/0.33 |
Manganese | 0.40/0.60 |
Phosphorus | 0.040 maximum |
Sulfur | 0.040 maximum |
Silicon | 0.15/0.35 |
Chromium | 0.80/1.10 |
Molybdenum | 0.15/0.25 |
TABLE 2-CHECK ANALYSIS TOLERANCES
Element | Limit or maximum specified (percent) | Tolerance (percent) over the maximum limit or under the minimum limit | |
Under minimum limit | Over maximum limit | ||
Carbon | Over 0.15 to 0.40 incl | .03 | .04 |
Manganese | To 0.60 incl | .03 | .03 |
Phosphorus1 | All ranges | .01 | |
Sulphur | All ranges | .01 | |
Silicon | To 0.30 incl | .02 | .03 |
Over 0.30 to 1.00 incl | .05 | .05 | |
Chromium | To 0.90 incl | .03 | .03 |
Over 0.90 to 2.10 incl | .05 | .05 | |
Molybdenum | To 0.20 incl | .01 | .01 |
Over 0.20 to 0.40 incl | .02 | .02 |
1Rephosphorized steels not subject to check analysis for phosphorus.
S = [P(1.3D2 + 0.4d2)] / (D2 - d2)
Where:
S = Wall stress in psi;
P = Minimum test pressure prescribed for water jacket test;
D = Outside diameter in inches;
d = Inside diameter in inches.
49 C.F.R. §178.44