BS 3146 Part1 CLA 11

[GraySyracuse]

Any recommended cast materials (Ni or Co base) to use for the oilfield drilling (turbodrilling motors) with similar properties to BS3146 Part 1 CLA 11 (nitriding steel)?

 

[TVP]

Unfortunately, I do not have a copy of this BS specification. Can you please provide the chemical composition, as well as the strength/hardness requirements? My first impression is that you do want to change to a Ni or Co-based alloy because the wear resistance will be greatly inferior to that of a nitrided steel alloy. Can you provide some additional details, such as your reasoning for changing to Ni or Co-based alloys? Expected operating environment, etc.?

 

[GraySyracuse]

BS 3146 Part 1 CLA 11 covers castings with 3% Cr-Mo nitriding steel (alloy similar BS 970 - 722M24.)
Analysis
C 0.20/0.30
Si 0.3/0.8
Mn 0.3/0.6
S & P 0.035 max
Cr 2.9/3.5
Mo 0.4/0.7
Ni 0.4 max
Cu .3 max
V .02 max
Sn .03 max
Mech prop (min)
TEN. STRENGTH 924 N/MM2
YIELD STRESS 780 N/MM2
ELONG 17.1%
BHN 269