4140Steel.com
About 4140Steel.com
4140 PH or4140 PREHARD has the same industry standard chemistry as above. 4140 Steel Bar Oil Quenched & Tempered 4140 PH has a standard, industry recognized Rockwell C Hardness rating of 28 - 32.Most sources recognize and tend to prefer quoting and requesting the Rockwell C Scale. 4140PH ranges from Brinell Hardness 270 - 300.Thick 4140 AN (in the Annealed condition) is flame cut, then Annealed onsite in our furnace. Annealing greatly improves Grinding and Machining.
