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NM500 Steel | Wear-Resistant Steel

NM500 Steel | Wear-Resistant Steel

NM500 is a wear-resistant steel known for its high hardness and toughness. The “NM” stands for “wear-resistant” and the “500” indicates its Brinell hardness. Originating in China, NM500 is used in industries requiring extreme abrasion resistance. It is similar to ASTM A514 steel. This steel is ideal for applications in mining, construction machinery, and heavy equipment.

Description

What is NM500?

NM500 is a high-strength wear-resistant steel composed of approximately 89% iron, 0.26% carbon, and alloying elements like chromium, molybdenum, and nickel. It is supplied as solid, hot-rolled plates. Known for high hardness and toughness, NM500 offers excellent abrasion resistance. Mainly used in mining, construction machinery, and heavy equipment, NM500 can be classified into NM500A, NM500B, and NM500C based on thickness and hardness levels for various heavy-duty applications.

Characteristics of NM500 Steel

NM500 steel features a uniform microstructure that enhances its mechanical properties, maintaining high impact resistance even at low temperatures. The steel’s composition includes elements that improve its weldability and formability, making it suitable for harsh environments. For customers, NM500 steel provides extended service life of components due to its superior wear resistance, reducing maintenance costs and downtime. Its high strength and durability allow for thinner, lighter parts without compromising performance, leading to material and cost savings. However, the high hardness of NM500 steel makes it challenging to machine and requires specialized equipment and techniques. For applications needing easier machinability, 450HB steel is recommended, offering a balance of hardness and workability.

Chemical Compositions

ElementMax Percentage
Carbon (C)0.30-0.35%
Manganese (Mn)1.20-1.60%
Silicon (Si)0.50% max
Phosphorus (P)0.025% max
Sulfur (S)0.010% max
Chromium (Cr)0.80-1.20%
Molybdenum (Mo)0.25-0.50%
Nickel (Ni)0.30% max
Boron (B)0.004% max
Iron (Fe)Balance

Physical Properties

PropertyMetricImperial
Density7.85 g/cm³0.284 lb/in³
Melting Point1425-1460°C2597-2660°F
Boiling PointNot AvailableNot Available
Thermal Conductivity42.7 W/m·K24.7 BTU·ft/h·°F
Electrical ConductivityNot AvailableNot Available
Specific Heat Capacity460 J/kg·K0.11 BTU/lb·°F
Thermal Expansion Coefficient12.1 µm/m·K6.7 µin/in·°F
Electrical Resistivity0.25 µΩ·m0.25 µΩ·m

Mechanical Properties

AC Properties of NM500 Steel

PropertyMetricImperial
Tensile Strength1250-1600 MPa181-232 ksi
Yield Strength1000-1300 MPa145-189 ksi
Brinell Hardness370-450 HBW370-450 HBW
Rockwell Hardness≥ 50 HRC≥ 50 HRC
Vickers Hardness≥ 460 HV≥ 460 HV
Elongation≥ 10%≥ 10%
Elastic Modulus210 GPa30.5 Msi

QT Properties of NM500 Steel

PropertyMetricImperial
Tensile Strength (Rm)1250-1600 MPa181-232 ksi
Yield Strength (Rp0.2)1000-1300 MPa145-189 ksi
Impact Toughness (KV/Ku)≥ 24 J≥ 17.7 ft-lb
Elongation (A)≥ 10%≥ 10%
Reduction in Area (Z)≥ 40%≥ 40%
Brinell Hardness (HBW)370-450 HBW370-450 HBW

Industries & Applications

IndustryApplications
MiningDump truck liners, excavator buckets, crusher plates, and wear-resistant linings
ConstructionBulldozer blades, loader shovels, and concrete mixer drums
AgricultureTillage tools, plowshares, and harvesting equipment
RecyclingShredder blades, crusher parts, and conveyor systems
CementChutes, hoppers, and wear-resistant liners
Steel ManufacturingRolling mills and wear-resistant rolls
Power GenerationCoal handling and ash disposal equipment

Machining

NM500 Heat Treatment Instructions

  1. Solution Treatment: Heat to 1050-1100°C, hold, then rapidly cool (usually in water).
  2. Aging Treatment: Heat at 200-500°C for an extended period.
  3. Quenching: Heat to 900-1000°C, then rapidly cool.
  4. Tempering: Reheat quenched steel to 200-600°C, then cool.
  5. Normalizing: Heat to 850-950°C, then air cool.
  6. Annealing: Heat to 700-800°C, hold, then slowly cool.

NM500 Surface Finish

  1. Surface Hardening: Includes flame and induction hardening.
  2. Carburizing: Heat in a carbon-rich environment at high temperature.
  3. Nitriding: Heat in a nitrogen or ammonia atmosphere.
  4. Carbonitriding: Similar to carburizing but with nitrogen addition.
  5. Electroplating: Electrochemically deposit a metal layer (e.g., chromium, nickel).
  6. Thermal Spraying: Apply a high-hardness, wear-resistant coating.

Custom surface treatment requirements can be accommodated upon request.

Disclaimer

The above heat treatment instructions and surface finish processing methods for NM500 are provided for informational purposes only. Actual results may vary based on the specific conditions and equipment used. It is recommended to perform testing and consult with a metallurgical expert or the material supplier to ensure the processes are suitable for your specific application. The user assumes all risks and liability for the use of this information.

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