Application of NM500 in Mining Machinery
Mining machinery operates under some of the harshest industrial conditions globally, constantly facing severe abrasive wear, heavy-duty impacts, dust erosion, ore scouring, and alternating hot and cold temperatures. Ordinary carbon steel and low-alloy structural steel cannot withstand long-term material scouring and impact, resulting in short service life, frequent replacements, and high maintenance costs.
NM500 is a tempered, high-hardness, wear-resistant steel plate conforming to GB/T 24186-2009 standards. With a Brinell hardness of 470–540 HBW, it possesses extremely high wear resistance, excellent impact toughness, and stable mechanical properties, while also exhibiting good cutting, bending, and welding performance. It has become the preferred core material for key wear parts in modern mining machinery and is widely used in open-pit mining, underground coal mining, ore crushing, material conveying, and bulk material handling equipment.
NM500 Performance Advantages for Mining Conditions
To adapt to complex mining operation scenarios, NM500 possesses unique material advantages compared with common steel grades:
Chemical composition
| C(％) | ≤0.38 | Si(％) | ≤0.70 | Mn(％) | ≤1.70 | P(％) | ≤0.020 |
| S(％) | ≤0.010 | Cr(％) | ≤1.20 | Mo (％) | ≤0.65 | Ni(％) | ≤1.00 |
- Superior abrasive wear resistance
- Its wear resistance is 3–5 times that of ordinary Q235 steel and obviously better than NM400, effectively resisting continuous friction of ore, coal gangue, gravel and mineral powder.
- Strong impact resistance
- Reasonable alloy composition and quenching & tempering microstructure endow NM500 with good low-temperature toughness, avoiding brittle fracture under heavy impact of large lump ore.
Stable hardness uniformity
Even thickness hardness consistency is good, no local softening failure, suitable for long-
term continuous operation of mining equipment.
Good machinability
It can realize plasma cutting, laser cutting, cold bending forming and professional low-hydrogen welding, meeting the customized processing requirements of various mining parts.
Lightweight replacement value
High strength and high hardness allow using thinner NM500 plates to replace thicker ordinary steel plates, reducing equipment self-weight, improving load capacity and lowering fuel and operation cost.
Typical Applications of NM500 in Core Mining Equipment
01 Crushing Equipment
Crushing equipment is the most severely worn link in mining, and NM500 is widely used in all series of crusher wear parts:
- Jaw crusher：jaw plate, tooth plate, side guard plate, toggle plate protective liner
- Cone crusher：concave liner, mantle, upper and lower protective plates
- Impact crusher：blow bar, impact plate, feeding guard plate
- Hammer crusher：hammer plate, lining plate, chassis anti-wear plate
These parts bear high-speed impact and extrusion of hard ore; NM500 effectively reduces surface abrasion, prolongs service life and decreases shutdown replacement frequency.
02 Mining Excavator and Loader
Open-pit mining excavators and loaders work all day in ore stockyards and mining sites, with key wearing components fully adopting NM500:
- Excavator：bucket bottom plate, side cutting plate, bucket tooth base, wear strip, arm protective plate
- Loader：bucket liner, cutting edge, side guard plate, material baffle
NM500 resists cutting wear and impact wear caused by shoveling hard rock and bulk ore, greatly improving the durability of the working device.
03 Mining Dump Truck and Haulage Vehicle
Large mining dump trucks undertake long-distance transportation of ore and coal materials, with serious cargo box wear:
- Cargo box lining plate, side baffle, tail gate anti-wear plate
- Wheel hub protective plate, chassis anti-scuff plate
Using NM500 lining plate can effectively solve the problems of material impact scouring and bottom plate depression deformation, reduce maintenance times and improve transportation efficiency.
04 Conveying & Feeding Equipment
Belt conveyors, scraper conveyors and vibrating feeders are indispensable bulk material handling equipment in mines:
- Conveyor chute liner, transfer point anti-wear lining
- Scraper conveyor middle trough liner, chain guide plate
- Vibrating feeder tank body lining, discharge port wear plate
NM500 reduces material impact and sliding friction, avoids chute perforation and material leakage, and ensures stable operation of conveying system.
NM500 Process Requirements in Mining Machinery Manufacturing
Cutting process
Adopt plasma, laser or water jet cutting; proper preheating is required for thick plates to avoid cutting edge cracking.
Bending forming
Control the minimum bending radius not less than 3 times the plate thickness, avoid sharp angle cold bending to prevent surface micro-cracks.
Welding construction
Use low-hydrogen welding materials, preheat before welding and implement slow cooling after welding to eliminate welding stress and prevent cold crack failure.
Surface treatmen
Shot blasting and painting can be performed according to the corrosion protection requirements of the equipment to adapt to long-term use in outdoor open-pit mining.
Summary of Economic Value and Application
The service life of vulnerable parts in mines is extended by 2–4 times, reducing equipment downtime and improving the overall operational efficiency of the mine.
Contact us today for premium NM500 wear-resistant steel plates – superior hardness, excellent durability, and competitive pricing to extend your equipment's service life.
We offer:
Consistently high-quality NM500 steel plates
Complete Factory Test Certificate (MTC)
Customizable sizes, fast delivery
Contact us today for a highly competitive quote and reduce your project costs by using NM500 steel plates.
FAQ:
What is the difference between Hardox 500 and NM500?
Hardness: NM500 typically has a hardness range of around 470-540 HBW (Brinell hardness), while Hardox 500 typically falls within the range of 470-530 HBW. The hardness level indicates their ability to withstand abrasive wear and impact.
Can NM500 be welded?
NM500 is weldable but demands strict welding procedures. It needs preheating at 100–150°C, matched low-hydrogen welding materials, and proper post-weld tempering treatment to guarantee welding quality.
What is the difference between AR500 and NM500?
AR500: Higher carbon (C: ~0.38–0.45%), chromium (Cr: ~1.5%), and boron (B: 0.0005–0.006%) for enhanced hardness and corrosion resistance . NM500: Lower carbon (C: ≤0.38%), added nickel (Ni: ≤1.0%) and molybdenum (Mo: ≤0.65%) for balanced weldability and toughness.