718

API 6A CRA

 

GENERAL SCOPE:

718 is a Nickel based, super-alloy steel that is predominately used in wellhead and downhole applications suitable for corrosive environments.

Chemical Composition:

  C Mn P S Si Cr Ni Mo Nb/Ta Ti Al Co
Minimum           17.000 50.000 2.800 4.870 0.800 0.400  
Maximum 0.045 0.350 0.010 0.010 0.350 21.000 55.000 3.300 5.200 1.150 0.600 1.000

COMMONLY STOCKED STRENGTH LEVELS:

120,000 psi yield minimum -  limited to a Rockwell C -40 maximum for compliance NACE MR-01-75/ISO 15156 (for use in hydrogen sulfide environments)

COMMONLY STOCKED MATERIAL FORMS:

Rolled bar
Forged bar