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softening or annealing sae 9260

softening or annealing sae 9260

softening or annealing sae 9260

(OP)
Hi all.

I have a few cold drawn sae 9260 round bar , size from 7/16" (11,11 mm) to 3/4" (19,05 mm) and I need to  down its hardeness to less than 190 brinnel.
What could be the appropiate heat treatment .?
The pourpouse of this treatment is to allow a cold drawn reduction to get smaller diameter.
The material will be used to make car suspension springs, it will hardendened after coiling .


This the chemical composition
Component    
Carbon, C    0.56    0.64
            
Iron, Fe    96        
Manganese, Mn    0.88        
Phosphorous, P                0.035
Sulfur, S                0.04
Silicon, Si                2        
Thanks in advance

Pardal

RE: softening or annealing sae 9260

You can anneal it down to around 260 BHN-use around 1575 deg F.  I don't think you'll get the hardness below that.

RE: softening or annealing sae 9260

9260 that has been speroidized annealed can have hardness as low as ~ 184 HB.  To spheroidize anneal, you can do two things:

1) heat to 760 °C (1400 °F) then cool to 705 °C (1300 °F) at a rate not to exceed 6 °C (10 °F) per hour.

or

2) heat to 760 °C then cool rapidly to 665 °C (1230 °F) and hold for 10 hours.

Since you are looking for the low end of possible hardness, you may need to use slightly longer times at temperature.

RE: softening or annealing sae 9260

(OP)
thanks for it boys.

have a happy week end
Pardal

Pardal

RE: softening or annealing sae 9260

pardal,

I'm not sure if you already know this, but using SAE 9260 with 0.04% Sulfur for an automotive suspension spring is not a good idea.  This level of Sulfur will result in many sulfide inclusions which greatly reduce the fatigue strength.  Typical Sulfur levels from true spring steels are more like 0.008%.  

RE: softening or annealing sae 9260

(OP)
Hi tpv .

This composition was token from a data sheet, not from a chemical analysis.
I will check it .

Thanks for the tip.

Pardal

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