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