Casting A 216 vs. A 352 steel

[awol]

My casting vendor is having trouble with inclusions when pouring A216. I noticed a similar grade of steel , A352, has comparable properties. The A216 is used for hi-temp and weldability. The A352 is used for low temp.

My part doesn't get welded and the max temp it experiences is 180 deg F. Is a straight substitution acceptable to the A352 , even though I don't need its low-temp capabilities?

What other material characterictics am I gaining or losing by switching to A352?

My part is threaded and the threads get used frequently. That is why I am avoiding A217 Stainless.

Thanks,
AWOL

 

[GRoberts]

Usually the A352 materials are higher quality, as it is harder to meet the impact requirements in A352, so there is more refining and less nasty residuals. The A352 material also normally gets a Q&T heat treatment verses a N&T for A216. These changes also usually make A352 material more expensive. (This applies to the LCA,LCB, LCC vs WCA, WCB, WCC comparison)

 

[priyasachin]

Priyasachin,

Dear friend,

Normally a 216 castings are for high temperature service and castings to A 352 for low temperature service. Since the castings to A352 needs care of manufacturing to have inherant fine grain to get the necessary Charpy impact properties, the material is costly than that of A216, and rejection too would be costly for the founder. Hence more care is taken while selecting the scrap and in refining during melting and while adding the ferro alloys to maintain the required composition.

As a rule the carbon too is held lower than A216 castings. Even the gating system and the heads provided to feed the casting during solidification is generous for A 352 castings. Further the castings to A352 would undergo radiography in addition. With all these restraints the castings to A352 are comparatively cleaner and sound than A216 Castings.
It is a normal convention in foundries to keep in mind that the inclusions, porosity, cavities are a part of casting. The differance between a good founder and the other one is where these unavoidable defects are located, either in the body of the castings or in those regions which are cut out for remelting.
regards,
MRCN