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Wear Resistance Steel Grades

Teda Ganghua supplies a full range of wear-resistant steels, including NM and AR series plates, with custom cutting, bending, and fabrication services for mining, cement, and construction industries.

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Wear Resistance Steel Grades

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Product Details

Wear-resistant steel grades are classified according to their hardness, chemical composition, and resistance to abrasion or impact.
These steels are designed to withstand severe wear in industries such as mining, construction, power generation, and cement manufacturing.

Understanding how wear-resistant steel grades are divided helps engineers and buyers select the right material for each working condition.

1. What Defines the Wear Resistance Grade

The wear resistance grade of steel is mainly determined by:

Surface Hardness (HBW or HRC) — measured using Brinell or Rockwell scales.

Alloy Composition — elements like carbon (C), manganese (Mn), chromium (Cr), nickel (Ni), and molybdenum (Mo) increase hardness and wear resistance.

Heat Treatment Process — such as quenching and tempering, which refine the microstructure and increase strength.

Toughness vs. Hardness Balance — ensures the plate is wear-resistant yet not too brittle.

2. Main Hardness-Based Classification

Wear Steel Grade	Hardness (HBW)	Typical Series	Main Application Area
Medium Wear-Resistant Steel	300–400	NM360 / AR360 / HARDOX 400	Medium wear: conveyors, liners
High Wear-Resistant Steel	400–450	NM400 / NM450 / AR400 / AR450	High abrasion: buckets, crushers
Ultra Wear-Resistant Steel	470–550	NM500 / AR500 / XAR500	Extreme wear: dump truck beds, mining chutes
Special Alloy Steel (Mn13, Tool Steel)	Work-hardening 200→500+	Mn13, X120Mn12	Impact wear: crushers, hammers

🟢 Interpretation:

The higher the HBW value, the greater the hardness and abrasion resistance.

However, too high hardness may reduce toughness — that’s why selecting the right grade for your operation is crucial.

3. Chemical Composition and Structural Differences

Grade Series	Carbon (C)	Manganese (Mn)	Chromium (Cr)	Nickel (Ni)	Features
NM Series (China)	0.20–0.25%	1.0–1.6%	0.8–1.5%	≤0.25%	Quenched & tempered, high cost-performance
AR Series (USA/Europe)	0.22–0.27%	1.0–1.5%	1.0–1.8%	≤0.25%	Uniform hardness, good weldability
Mn13 / X120Mn12	1.1–1.3%	11–14%	—	—	Work-hardening, great impact resistance

Each series represents a balance between hardness, toughness, and cost efficiency, depending on the working conditions.

4. Typical Hardness Comparison Chart

Steel Grade	Hardness (HBW)	Yield Strength (MPa)	Impact Resistance	Service Life vs Normal Steel
Mild Steel	120–180	250–350	High	1×
NM360 / AR360	320–380	900–1000	Medium	2–3×
NM400 / AR400	370–430	1100–1200	Medium	3–4×
NM450 / AR450	420–480	1200–1350	Good	4–5×
NM500 / AR500	470–540	1300–1450	Moderate	5–6×
Mn13	200–250 (work-hardens to 500+)	800–900	Excellent	6–8×

5. How to Choose the Right Grade

When selecting wear-resistant steel, consider:

Type of wear: sliding, impact, or both

Operating temperature: low (<200°C) or high (>400°C)

Required toughness: whether the part needs bending or forming

Cost vs. lifespan: NM400 or AR400 for balance, NM500 or AR500 for severe wear

For heavy-impact environments such as crushers or hoppers, Mn13 is often used due to its self-hardening property under stress.

✅ Conclusion

Wear resistance steel grades are primarily classified by hardness (HBW) and alloy composition.
From NM360 to NM500 or AR400 to AR500, each grade offers a specific balance of hardness, strength, and toughness suited for different abrasion conditions.