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topic 10441

Replacements for 4750 Steel


What are the components of Hastelloy, Ni, Fe, Cr, etc? Anybody have a less expensive substitute for 4750 steel? Laser application? 1/2" dia. rod, small turned part.

Bill vail
- Boulder, Colorado, USA


Question 1. Which Hastelloy? They're all Ni-base alloys but there are dozens of grades with significantly different details. Usually identified with a letter or alphanumeric suffix, for instance "Hastelloy B" or Hastelloy C-276".

Question 2. 4750 would be a simple Ni-Cr-Mo low alloy steel. What mechanical properties do you want (strength, hardness etc)? Those requirements plus the section thickness (which you have already given as 1/2 inch) will lead to a list of suitable steels and you could then price supply of each grade.

Bill Reynolds
Bill Reynolds
   consultant metallurgist
Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.


Hello Bill!

Hastelloy information can be found at, a page from Haynes International's site.

I don't know what you mean by "4750" steel. WE use that as essentially a slang term for nickel iron magnetic metal, with 47-50% nickel in it, because that's what Allegheny Ludlum called it back when they made it. There is no 4750 in the AISI system, nor is it a former standard SAE steel. Can you clarify?

Good luck!

lee gearhart
Lee Gearhart


Hello Lee,

Re 4750. The AISI system for carbon and low alloy steels uses the first two digits to specify standardised alloy levels (47 = nominal 1%Ni 0.5%Cr 0.25%Mo) and the last two digits to specify the nominal carbon level with the decimal point omitted (50 = 0.50%C). While there are many "standard" or established AISI grades, the system is available to describe other grades (such as 4750). I didn't consider the possibility that someone would come up with a house designation that complied with an established naming protocol but had a substantially different meaning. Live and learn!

Bill Reynolds
Bill Reynolds
   consultant metallurgist
Ballarat, Victoria, Australia

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