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what is material 8620 4

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JSBCintl

Materials
Jun 14, 2011
19
This material is urethane coated and used for a valve in a mud pump, but what is the material when all they call out is Material: 8620 ??
 
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8620 in a slurry pump is a very poor call. This is because this is a case hardening steel and normally only 0.6-1.0mm depth on the surface is case hardened,the rest is soft. In no time will this case get removed and expose the soft interior. Please reconsider your choice.

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"Softness" is relative; I would not call HRC 45, tensile 210,000 psi, soft. Typical for a Q&T at C= 0.20.
 
Max hardness 8620 ( actual C= 0.18%) is HRC 45; per USX handbook of IT diagrams(1963 ed.). In agreement with Clark & Kowall, AIME Transactions, 1944. pg 328.
I guess you can learn everything on the internet.
 
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