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Q: What is the chemical composition of NM400 wear-resistant steel plate?

10/10/2026 02:02:40

1 answers in: Product Standards

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Chemical composition and mechanical properties of wear-resistant steel plates

Grade	Chemical composition * (mass fraction) / %
	C	Si	Mn	P	S	Cr	Ni	Mo	Ti	B	Als
	≤									Range	≥
NM360	0.25	0.7	1.6	0.025	0.015	0.8	0.5	0.5	0.050	0.0005~0,006	0.010
NM400	0.3	0.7	1.6	0.025	0.01	1.00	0.7	0.5	0.050	0.0005~0.006	0.010
NM450	0.35	0.7	1.7	0.025	0.01	1.1	0.80	0.55	0.050	0.0005~0,006	0.010
NM500	0.38	0.7	1.7	0.02	0.01	1.2	1	0.65	0.050	0.0005~0.006	0.010
NM550	0.38	0.7	1.7	0.02	0.01	1.2	1	0.7	0.050	0.0005~0.006	0.010
NM600	0.45	0.7	1.9	0.02	0.01	1.5	1	0.8	0.050	0.0005~0.006	0.010
For NM400 and lower grades, the Si and Mn contents may be increased to 2.00% and 2.20%, respectively; the content of alloying elements is to be determined by the supplier.

C: Improves hardness and wear resistance, but too much carbon will reduce toughness and weldability.

Mn: Improves hardenability and strength, and aids in wear resistance.

Cr, Mo, Ni: improve hardenability, enabling thick plates to achieve high hardness.

P and S: harmful impurities; the lower the better, especially affecting toughness and weldability.

Grade	Thickness /mm	Tensile Strength Rm/MPa	Elongation after fracture A /%	Impact absorbed energy at -20 ℃ (longitudinal) KV/J	Surface Brinell Hardness HBW
NM360	≤80	＞1100	≥12	≥24	330~390
NM400	＜80	≥1200	≥10	≥24	370~430
NM450	＜80	≥1250	≥7	≥24	420~480
NM500	≤70	—	—	—	≥470
NM550	≤70	—	—	—	≥530
NM600	≤60	—	—	—	≥570

Time：09/10/2026 16:40:56

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