NM400
NM400 and NM500 are both high-performance wear resistant steel plates within the NM series.
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NM400 provides excellent balance between wear resistance, 靭性, and workability.
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NM500 offers significantly higher hardness and abrasion strength for demanding environments.
Material selection should be based on abrasion severity, 衝撃荷重, fabrication requirements, and expected service life to ensure optimal performance and cost efficiency.
- 説明
NM400 is a high-strength abrasion resistant steel plate widely used in mining, 工事, セメント, and heavy machinery industries. It is produced through quenching and tempering processes to obtain a martensitic microstructure, providing a balanced combination of hardness, 靭性, 溶接性.
NM500 belongs to the same wear resistant steel series but offers higher hardness and stronger abrasion resistance. Below is a detailed comparison between NM400 and NM500 in terms of chemical composition and wear strength.
1. 化学組成の比較 (代表的な範囲, %)
The exact composition varies slightly depending on thickness and production process, but the typical ranges are:
| 要素 | NM400 (%) | NM500 (%) | Function in Steel |
|---|---|---|---|
| 炭素 (C) | 0.17–0.24 | 0.20–0.28 | 硬度と強度を高めます |
| マンガン (ん) | 0.70–1.60 | 0.70–1.60 | 焼入性と靭性が向上します |
| シリコン (そして) | ≤0.50 | ≤0.50 | Strengthens matrix |
| クロム (Cr) | 0.30–1.00 | 0.40-1.20 | 耐摩耗性の向上 |
| ニッケル (で) | ≤1.00 | ≤1.00 | 衝撃靱性の向上 |
| モリブデン (モー) | ≤0.50 | ≤0.70 | 焼入性の向上 |
| ボロン (B) | トレース | トレース | 焼入性が大幅に向上します |
Key Composition Differences:
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NM500 generally has slightly higher carbon and alloy content.
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Higher alloying improves hardenability and final hardness.
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Both grades maintain low impurity levels for better toughness and weldability.
2. Hardness and Wear Resistance Comparison
Hardness is the primary indicator of abrasion resistance.
| 財産 | NM400 | NM500 |
|---|---|---|
| ブリネル硬度 (HBW) | 370–430 | 470–540 |
| 降伏強さ (MPa, 約。) | ≥1000 | ≥1250 |
| 抗張力 (MPa, 約。) | 1200–1600 | 1400–1800 |
| 衝撃靱性 | 良い | 中程度から良好 |
| Relative Wear Resistance | 1.0 (baseline) | ~1.2–1.5 times NM400 |
Wear Strength Comparison
NM500 offers approximately 20–50% higher abrasion resistance than NM400 under similar working conditions.
This improvement comes from:
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Higher hardness
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More stable martensitic structure
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Improved alloy hardenability
しかし, higher hardness slightly reduces ductility and increases forming difficulty compared to NM400.
3. アプリケーションの比較
NM400 – Balanced Performance
に適しています:
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ローダーバケット
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ダンプトラックの車体
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コンベヤライナー
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ホッパー
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Moderate impact + abrasion environments
利点:
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Good weldability
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Easier bending and processing
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費用対効果の高いソリューション
NM500 – Severe Abrasion Environments
に適しています:
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クラッシャーライナー
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Mining wear plates
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High-wear chutes
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Heavy-duty earthmoving equipment
利点:
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Longer service life in sliding abrasion
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Reduced replacement frequency
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Better performance in high-wear conditions
4. Processing Considerations
| Factor | NM400 | NM500 |
|---|---|---|
| 切断 | Easier | Requires more power |
| 曲げ | Good formability | Limited bending radius required |
| 溶接 | Standard preheat control | Stricter preheat recommended |
| 機械加工 | Moderate difficulty | Higher tool wear |
NM400 is more fabrication-friendly, while NM500 prioritizes maximum wear resistance.
5. Selection Guidelines
選ぶ NM400 いつ:
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Balanced wear and toughness are required
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Forming and welding are important
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Moderate abrasion dominates
選ぶ NM500 いつ:
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Severe sliding abrasion is the main wear mechanism
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Longer service life is critical
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Fabrication complexity is acceptable
