4140
AISI 4140: ASTM A-29, ASTM A-193, ASTM A-519, API 5CT, API 6A, API SPEC 7-1, & API 14A
GENERAL SCOPE:
4140 is a low alloy steel that is commonly used in downhole tools. It is a heat treatable alloy steel that contains nominally .40% Carbon with Chromium and Molybdenum as the primary hardening elements.
CHEMICAL COMPOSITION:
C | Mn | P | S | Si | Cr | Mo | |
---|---|---|---|---|---|---|---|
Minimum | 0.380 | 0.750 | 0.150 | 0.800 | 0.150 | ||
Maximum | 0.430 | 1.000 | 0.025 | 0.025 | 0.350 | 1.100 | 0.250 |
COMMONLY STOCKED STRENGTH LEVELS:
80,000 psi minimum yield - limited to a Rockwell C -22 maximum for compliance to NACE MR-01-75/ISO 15156
110,000 psi minimum yield - 285-341 Brinell surface hardness
125,000 psi minimum yield - 285-341 Brinell surface hardness
Annealed or As-rolled - no mechanical properties; suitable for further heat treatment
COMMONLY STOCKED MATERIAL FORMS:
Rolled bar
Forged bar
Seamless tubing
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