AISI 4130 Steel Alloy factor 2

[metalguesser]

Hi Guys!

I have a question regarding Alloy factor.

A customer has specified an alloy factor of 20 (minimum)
for AISI 4130 steel (& CE = 0.65%). I have seen an alloy factor formula for low alloy carburizing grade steel (But that works out to around 1). While, we understand the CE part we are not clear on the Alloy factor part. This is the first time we have come across such a spec.

Any help, suggestions etc. is sincerely appreciated.

Thanks in anticipation,

 

[redpicker]

Get a copy of ASTM A255 (I think that is the correct one). It has a method of calculating a Jominy curve from a low alloy steel chemistry. Their method involves determining the Ideal Diameter (DI) from the carbon content and multiplying this by an alloy factor that is the product of factors determined by the content of various alloying elements. I believe it was Grossman's work in the 1930's that came up with this method.

Do not confuse this method with the Carbon Equivilant calculations used for welding. While both are based on chemistry, they are not the same thing.

rp

 

[dbooker630]

SAE J406 will also help with hardenability and Jominy curves.