Castable, corrosion resistant replacement for tool steel 2

[gandytable]

Need a castable, corrosion resistant replacement for tool steel. The present parts are cast in a tool steel with the following specifications. Tool Steel AISI D7, harden to 65RC, double temper to 59-60 RC, sub zero cool at minus 100 degrees F minimum for 6 hours after first temper. This works well, but need a "corrosion resistant" material to meet guidlines in the food industry. The application is for knife blades in a "pulper", which grinds food and paper waste. Needs to be castable since the blades are curved.

 

[alexit]

To meet this...harden to 65RC, double temper to 59-60 RC, sub zero cool at minus 100 degrees F minimum for 6 hours after first temper...I would suggest looking at 440C Stainless Steel.

Alex

 

[israelkk]

You may try plasma hard coating of ceramics over the current blades those coatings can go up as 70 Rc and even higher. Try the UNION CARBIDE company.

 

[gandytable]

I thank the members for their help thusfar. I add a requirement - Since the application is for knife blades, they need to hold an edge relatively well. Thanks again.

 

[Maui]

I would suggest that you consider CPM S30V for this application. The following link will provide you with the pertinent material data sheets:

http://www.crucibleservice.com/datash/dsS30Vv4b.pdf

Maui

 

[arunmrao]

CA40 grade of martensitic stainless steel is a cast alloy. We frequently use this to cast food grade mixer blades and also for pulper mixers used in paper industries. It can e heat treated to desired hardness and gives a good service life.(Repeat orders are infrequent!)

 

[alexit]

I think any material hardened to 65 Rc will keeps its form very well (hold an edge.) I believe my Solingen Chef's knives are 400 series stainless...


Alex

 

[richardbuss]

Hi Gandytable,

my company makes a special type of stainless tool steel called RN15X. It is very similar to an AISI D2 in its wear properties but offers stainless resistance similar to AISI 440 B / C stainless steels. Its also secondary hardenable so you would be able to do a PVD or CVD coating if this is necessary. We already use this for some food stuff applications.

If interested drop me a mail and I will send you a data sheet.

Regards
Richard Buss