GB/T 3077 20Ni4Mo is a chinese grade of high hardenability and high strength cementation steel .If you need 20Ni4Mo steel round bar, or other grades,pleas e feel free to contact us.
SAE1045 round bar is a high-strength carbon quenched and tempered steel,which has a certain degree of ductility and toughness, high strength, good machinability.
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