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Re: 8620 Steel Hardening

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Posted by Bob (63.73.63.97) on December 09, 2002 at 20:33:30:

In Reply to: 8620 Steel Hardening posted by John Paul on July 03, 2002 at 00:59:10:

: What´s best hardness treatment for 8620 Steel?
: It´s for a 16mm shaft that will work with a one-way bearing on it. 15N*m torque in the shaft.
: Bearing specification says 58 Rockwell C minimum.
: Thanks All!
: JP

Why don't you go for a through-hardening grade of steel. Consult Machinery's Handbook. AISI 1040-1045-1050 grades might be a choice for a shaft. These are ordinarily hardenable to HRC 50 or higher with little effort, but some cost!

A better surface hardening grade than you're using is AISI 1117. It's cheaper and easier to harden. Carbon-nitriding is the normal surface hardening process for this surface-hardenable grade. The 8620 grade is prone to brittleness and I wouldn't use it for a shaft.

Bob

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Subject: Re: Re: 8620 Steel Hardening

Comments:
: : What´s best hardness treatment for 8620 Steel? : : It´s for a 16mm shaft that will work with a one-way bearing on it. 15N*m torque in the shaft. : : Bearing specification says 58 Rockwell C minimum. : : Thanks All! : : JP : Why don't you go for a through-hardening grade of steel. Consult Machinery's Handbook. AISI 1040-1045-1050 grades might be a choice for a shaft. These are ordinarily hardenable to HRC 50 or higher with little effort, but some cost! : A better surface hardening grade than you're using is AISI 1117. It's cheaper and easier to harden. Carbon-nitriding is the normal surface hardening process for this surface-hardenable grade. The 8620 grade is prone to brittleness and I wouldn't use it for a shaft. : Bob

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