AISI 4140: ASTM A-29, ASTM A-193, ASTM A-519, API 5CT, API 6A, API Spec 7-1, & API 14A
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.
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