Discussion
Which restriction applies to repairing hot formed boron steel members?
Answer: D
The martensitic structure produced by hot forming and quenching is destroyed by any subsequent heating, and the material has too little ductility to be straightened cold. Manufacturers therefore specify complete replacement of such members at defined sectioning points. Repairing them incorrectly leaves a structure that will not perform as designed in a subsequent collision. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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