How does SAE 1020 compared to 20CrMoTi 2

[JSBCintl]

I have placed an order in China for a forging in 1020 steel.
The Chinese supplier has offered to make the samples in what he calls: 20CrMoTi since the samples are only a small quantity. Once approved, they will by a production run of 1020 or Chinese #20 steel.
What is 20CrMoTi steel and how does it compare to SAE 1020?
this is sort of urgent and I don't have the reference books to resolve the question. Thanks for your help.

 

[gtaw]

Go to a different supplier.

Best regards - Al

 

[salmon2]

I won't take it as 20crmoti is a alloy steel but 1020 is plain cabin steel their hardenability will be totally different if after forging heat treatment is on the way. I have a feeling 20crmoti is like a 4120, very available so they want to use that for trial. I did a search but not finding any detailed chemical composition for the alloy. Why don't you ask for a mtf from them?

 

[TVP]

I believe the designation should be 20CrMnTi, as this is a common alloy grade in China for bars, forgings, etc. It is nominally 0.2%C - 1%Cr - 1%Mn - 0.07%Ti. The closest standard North American grade is 5120 according to ASTM A29 or SAE J404/1268 with an addition of 0.04-0.10% Ti. The mechanical properties will be substantially different from 1020 unless it is used in the annealed or normalized condition, in which case they would be somewhat similar.

 

[salmon2]

By Chinese standard GB3077, there are 20CrMnTi with chemistry as TVP noted, and 20CrMo which has 0.2%c, 0.4~0.7%Mn, 0.8~1.1%Cr, and 0.15~0.25%Mo, more like SAE 4120. Not sure if it is a typo of 20CrMnTi or a variant of 20CrMo because the designation of 20CrMoTi is quite common on alibaba.

By the way, I suggested JSBCintl to ask for a mtr, instead of "mtf". It is a typo here,

 

[metengr]

JSBCintl;
Besides chemical composition and heat treatment, material substitution has to be very carefully evaluated based on service and fabrication. You will have weldability issues with this material substitution, if applicable.