AISI 4140
AISI 4140
(OP)
Can anybody tell me is it acheivable to obtain heat treated AISI 4140. lookin to acheive 130,000 yield with a hardness of 34 Rockwell C. The bar stock forged to shape with a 5.750" ID and a 8" OD.
This is not Nace required so would an Rockwell C of 36 be acceptable?
Cheers for any help available
This is not Nace required so would an Rockwell C of 36 be acceptable?
Cheers for any help available





RE: AISI 4140
For heat treatment, the austenitizing temperature should be 1600 deg F and held for 1 hour per inch of wall thickness. Liquid (no water) quench and temper at 900 deg F for 1 hour to assure a minimum yield of 131 Ksi. The hardness will be in the range of 33-36 HRc.