Ⅰ. Raw materials metallographic organizations
Ⅱ. Hardness testing
Ⅲ. Heat treatment hardness
Ⅳ. Metallographic organizations testing
Ⅴ. Torque testing
Ⅵ. Crackle flaw detection testing
Ⅶ. Crush power performance testing
Ⅷ. Dentiform size projection testing
Ⅸ. Axle integrated performance testing
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