AISI 4130 / Inconel 625 3

[learningman]

Sorry my earlier question should have read what is the main differences between AISI 4130 & AISI 4140.
I also need to know why you would use Inconel 625 rather than 17/4ph when inlaying welds and for anti extrusion rings on Seals

 

[metengr]

I can tackle your first question;
The main difference is in mass percent carbon content, as indicated by the last two digits, 0.30% versus 0.40% of 41xx.

 

[dbooker630]

Adding to the first question:
The other difference is the manganese range; Mn is lower in 4130, .40-.60 vs. .75-1.00 in 4140.

 

[texastkiker]

i might add 4130 is a water hardening steel as 4140 is a oil/polymer hardening steel

 

[metman]

Adding to comments wr2 question 1: 4130 is more weldable than 4140. No pre or post heat required in most cases for welding 4130. 4130 is apparently so forgiving with respect to thermal
processing for example; In the aircraft industry it is not unual to allow "flame(Oxy-Acelyne torch)" Normalizing after welding.