Automotive steel sheet mechanical properties capability

[Dasittingduck]

Looking for feedback in regards to the requirements/expectations for automotive steel sheet mechanical properties capability. For example, is there a general requirement for tensile and yield strength to meet a minimum Cpk value? Obviously this could vary based on the OEM and their particular requirements so my question is more in general.

 

[Golfman25]

Yeah, I don't think you'll find anything. The mechanical properties are generally used to classify the steel. For example, 1/2 hard steel will have a tensile & yield strength in a certain range. Soft Steel will have a different range, etc.

 

[Johnnymo62]

My experience is that the OEMs have their own Engineering Specifications for steel and other materials. They do not rely on the ASTM standards.

Ford has WSS-M1A345-A series, WSS-M1A367-A series and WSS-M1A368-A series, for example.

 

[Ron Rompen]

In my experience, I have never seen a requirement for capability on mechanical properties of raw materials such as steel.

In general, properties of the steel (chemical and/or mechanical) are described in a standard document (such as the ASTM standards. OEE's may have they own requirements (as Johnnymo62 pointed out) but these are usually derived from the ASTM standards. Unless you have an agreement with a steel mill, you are unlikely to be able to get anyone to agree to anything outside these limits.
SOME mechanical properties are affected by secondary processing (rolling mills) but again, they are limited in how much change they can effect based on the raw material they are provided.