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its hight strength steel , mild steel hasn't been used in auto or truck frames for a long time. for auto motive uses the grades go mild , high strength and ultra high strength. Ultra high strength is what the intrusion beams in the doors are made off.
 

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DSGFTW
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Discussion Starter #5
its hight strength steel , mild steel hasn't been used in auto or truck frames for a long time. for auto motive uses the grades go mild , high strength and ultra high strength. Ultra high strength is what the intrusion beams in the doors are made off.
Thanks that's what I was looking for. I had a feeling that mild steel was not used anymore
 
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