Hello guys, I have been working as heat treatment engineer since september 2017. This is my first experience in industry. I have problem with the hardness and tensile of some parts. The problem is, actually we are using different type of raw materials(15 different types for aısı4340 for example). All of them related to same spec. But you know there should be little difference between every raw material, something like elemental amounts. The problem is, planning department doesnt know anything about raw materials. Every aısı4340 is same for them. But sometimes hardness value should be lower than what spec want even i do the same treatment. What do you think, what should i check on raw material certificate to understand which raw material will be harder or higher tensile strength than others.
Thanks for your help.
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