The first thing you need to do is determine the properties required of the filler you intend to use. Abrasion, temperature, corrosivity etc.
You need a history of the targeted service, or a similar service, and data of selected alloys. But most of all, if the service in any way has a risk to human health or safety you need a design engineer.

Main to heran hun k tujhay itni english a kaisay gai????? Its Strange & embarassing for all the FFC Employs......

Why hardsurface such a hard alloy?  The stellite that you put on would not be harder than the 440c if you fully heat treat the 440c.  If you do not have the means to heat treat, that's another issue.  You choose the proper stellite based on its hardness and your required hardness. To do stellite right though, you need to post weld heat treat it anyway----so if you can't heat treat, don't hardface.   Heat treating is done at 1900 -1925---hold for about 1 hour per inch of cross sectional thickness (no less than 1/2 hour)---air or oil quench---temper at 400 -675 (the lower the harder) for about 1 hour per inch of cross sectional thickness (no less than 1/2 hour).  Luck to you my friend!

Others have ask also, but what service is the material going into.  Example: Oil Field Valves and Gates?  You tell us.   John