How to specify cast low-alloy steel?
How to specify cast low-alloy steel?
(OP)
Have a small investment cast part (carrier) which was originally made from 8620 bar stock. It is now an investment casting. How do I specify the material and/or heat treatment?
SAE 8620 is for wrought products however I have seen several foundries say they can pour 8620. ASTM A29 lists only chemistry. Do I need more than one spec?
Looking at past material certs, they did not call out a specification only the material number 8620. Hardness ranged from 70-90 RB from lot to lot, within each lot the hardness range was more refined (76-82, 84-90 ect...).
The carrier is used in a check valve with a service temp range from -60 to +400F. One side holds the softer seat material and the other side has a spring pushing against it. So I think this is the right material choice, just confused as how to specify a wrought material for a casting?
SAE 8620 is for wrought products however I have seen several foundries say they can pour 8620. ASTM A29 lists only chemistry. Do I need more than one spec?
Looking at past material certs, they did not call out a specification only the material number 8620. Hardness ranged from 70-90 RB from lot to lot, within each lot the hardness range was more refined (76-82, 84-90 ect...).
The carrier is used in a check valve with a service temp range from -60 to +400F. One side holds the softer seat material and the other side has a spring pushing against it. So I think this is the right material choice, just confused as how to specify a wrought material for a casting?





RE: How to specify cast low-alloy steel?
RE: How to specify cast low-alloy steel?
This way I have been producing 8620 grade castings to the satisfation of customers.
RE: How to specify cast low-alloy steel?
ASTM A915 / A915M
Abstract
This specification covers carbon and low alloy steel castings having chemical analyses similar to that of the standard wrought grades. Several grades are covered, such as; SC 1020, SC 1025, SC 1030, SC 1040, SC 1045, SC 4130, SC 4140, SC 4330, SC 4340, SC 8620, SC 8625, and SC 8630. Castings shall be heat treated either by full annealing, normalizing, normalizing and tempering, or quenching and tempering. The steel shall conform to the requirements of chemical composition as specified.
RE: How to specify cast low-alloy steel?
RE: How to specify cast low-alloy steel?