NM400 & NM500

NM—Steel for wear-resistant use, N--Nai means "resistant", M--Mo means "grinding", they are the first letters of the Chinese pinyin, 400 and 500 are brinell hardness values(HB).

Grade	C	Si	Mn	S	P	Cr
NM400	≤0.25	≤0.70	≤1.60	≤0.01	≤0.025	≤1.40
NM500	≤0.38	≤0.70	≤1.70	≤0.01	≤0.020	≤1.20

NM400 is a wear-resistant steel plate with high mechanical strength; the mechanical properties of NM400 are 3 to 5 times that of ordinary low-alloy steel plates; the surface hardness of NM400 products usually reaches 360-450HB. It commonly used in the processing and manufacturing of wear-resistant and vulnerable parts for mines and various construction machinery, etc.

NM500 is a steel plate with high wear resistance. NM500 wear-resistant steel plate is mainly used in mining machinery and other equipment, and is often used on the key wear-resistant contact surface of friction and impact.