NM400 has become a de facto standard for mining equipment liners because it occupies the sweet spot between wear performance and cost-effectiveness. The designation “NM” stands for wear-resistant steel in Chinese practice, while “400” refers to its nominal Brinell hardness of approximately 400 HBW. The surface hardness typically ranges from 360 to 450 HB, and its mechanical strength is three to five times that of ordinary low-Alloy steel plates.
In mining operations, equipment liners face constant abrasion from ore, rock, and slurry. NM400 is widely used in crusher liners, chute linings, hopper liners, and bucket liners. Its quench-and-temper processing delivers a balance of hardness for wear resistance and toughness to resist impact cracking, which is critical when large ore chunks strike liner surfaces. The plate also performs well in low-temperature environments, with variants suitable for service down to −20°C or even −40°C.
Manufactured according to GB/T 24186 standards, NM400 is readily available in thicknesses from 8 to 120 mm, making it adaptable to different liner configurations. Its weldability, while requiring preheating and controlled cooling, is manageable for fabrication shops. For mid-duty mining applications where extreme hardness is not mandatory, NM400 delivers an excellent life-for-cost ratio, which is why it has become the benchmark grade in the industry.
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