Among the martensitic steels, the 630 can be found, also known as 17-4 PH, a precipitation hardened steel, mainly used in the oil and gas field, turbines and the marine sector.
Le norme poste tra parentesi sono state ritirate e non più valide, mentre gli acciai posti tra parentesi hanno analisi chimiche simili ma non uguali a quelle delle norme vigenti in Europa.
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