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The difference between Class 1 and Class 2 SA-387

The difference between Class 1 and Class 2 SA-387

The difference between Class 1 and Class 2 SA-387

Dear All

I want to know what is the difference between class 1 and class 2 in SA-387. As per the specification, there is no difference in chemical composition of these two classes. However, there is difference between the two classes in terms of their mechanical strength.
In table3 of the specification Note A, it is mentioned that the values are not applicable to annealed materials. So can we say that the difference between class 1 and class 2 is that class 1 is normalized and tempered and class 2 is annealed?
And finally in the heat treatment section of the specification there is a third heat treatment which is accelerated cooling from the austenitizing temperature by air blasting or liquid quenching followed by tempering. Is this heat treatment also class 1?

Warm Regards

RE: The difference between Class 1 and Class 2 SA-387

IMO, the strength differences between SA-387 Class 1 and 2 material can be resulted from the minor differences of the chemical composition as well as the heat treatment process. Basically, the selection of either class material is based on the mechanical strength at the elevated temperature service. And, the prices of two classes material are also different.

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