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BS 3146 Part1 CLA 11

BS 3146 Part1 CLA 11

BS 3146 Part1 CLA 11

(OP)
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)?

RE: BS 3146 Part1 CLA 11

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.?

RE: BS 3146 Part1 CLA 11

(OP)
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

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