Want Suggestions for Cast Material Suitable for High Temperature Use and Significant Abrasion Resist

[PressEquip]

Hello,

There is a ball that is used for form metal in a spinning process which includes hot spinning. Ideal material would have high abrasion resistance, high toughness and suitable for high temperature use (surface temperatures up to ~1300F).

Ball size: 40” OD (39.370” finished OD) x 11.5” ID (11.811” finished ID) x 25” Long (23.622” finished length) Casting, Approximate Weight 7,400 lbs

I've ruled out any castings with significant amounts of chrome (over 0.5%) because it increases brittleness; all ASTM A532 materials.

Any suggestions on material grades that should be considered?

Thank you for your time

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[metengr]

Look at cast Hadfield steels.

 

[arunmrao]

I would still like to visit high chrome irons. I don't see much impact in your description, but significantly wear and operating temperature of 600F. You might use some of them in annealed condition about 300-350BHN .

Hadfield steel, a good choice ,will not develop surface hardness, unless subject to impact. May be you can consider preconditioning the material, before use.

"Even,if you are a minority of one, truth is the truth."

Mahatma Gandhi.

 

[HakiNoir]

If you dont want anything in A532 range, for high temperature I would consider Ni-Mo-Cr alloys (Hastelloy B, C, etc.) or possibly Stellite/other cobalt based alloys.
Also consider hard facing (PTA or laser) with Stellite or WC base coatings.

 

[PressEquip]

Thank you all for your responses

I'll look into cast Hadfield steels

Maybe I was too quick to rule out castings with significant chrome (ASTM A532). The operating temperature of the ball would definitely be over 600F, because the plan is to pre-heat the ball before hot spinning to reduce the thermal gradient in the ball. The surface temperature of the ball might reach ~1300F or higher (hot spin stainless pieces that are pre-heated to 2150F in a oven)

I'm shying away from Hastelloy material due to cost. That is a great suggestion to look into surface treatments that would create a very abrasion resistant layer on the surface. In the past I was involved in a job where they did high velocity oxy-fuel carbide coating on the surface of part.

I want high surface hardness, hopefully over 600 HB

I'm looking into Austempered Ductile Iron Castings (ASTM A897) as an option. Hardness only reach up to 460 HB (Grade 5).

Thank you for your time

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[EdStainless]

There are high Cr irons, and then really high Cr irons. Stay with the lower Cr versions.
Honestly for hot hardness either a Cr cast iron or a Co based alloy are your only real options. And the Co alloy will be 10-20 times the price

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[HakiNoir]

Your welcome. HVOF does not have superior impact resistance though but easily can reach 1200 HV. If you go that path let me know I have robotic HVOF