NM450：Property，Bending，Welding，Application，Price
As a professional service provider in China’s steel trade sector, we understand the criticality of material selection under harsh operating conditions. NM450, a high-strength wear-resistant steel plate, has become an ideal choice for mining, construction machinery, and other industries due to its exceptional cost-effectiveness. This article provides a detailed analysis of NM450 from perspectives including properties, bending/welding processes, applications, pricing strategies, and more, empowering you to make precise material decisions.
NM450 workpiece
Core Properties of NM450
NM450 is a quenched and tempered wear-resistant steel compliant with the Chinese national standard GB/T 24186. Its key advantages include:
- Ultra-High Hardness: Surface hardness reaches 450 HBW (Brinell hardness), offering wear resistance far superior to ordinary structural steel.
- Scientific Composition: Precise ratios of carbon (C), manganese (Mn), silicon (Si), chromium (Cr), and boron (B) balance hardness and toughness.
- Flexible Thickness: Available in 3.0–120 mm thicknesses to meet diverse equipment protection needs.
- Advanced Processing: Quenching + tempering (Q&T) ensures uniform hardness and impact resistance.
Bending and Welding Guidelines
Bending Recommendations
- Preheat to 150–200°C (prevents brittle cracking in cold states).
- Minimum bend radius ≥5× plate thickness (e.g., 3.0 mm plate requires R15 mm).
- Prioritize hydraulic press brakes for gradual pressure application to avoid stress concentration.
Welding Specifications
- Electrode/Wire: Low-hydrogen electrodes (e.g., E7015/E7016) or ER70S-6 wire.
- Preheating: 100–150°C (increase to 180°C for plates >20 mm thick).
- Interpass Temperature: <250°C (monitored via infrared thermometer).
- Post-Weld Treatment: Stress-relief annealing at 300–400°C (critical for load-bearing components).
Key Application Scenarios
|
Industry
|
Components |
Benefits
|
|
Mining Machinery |
Excavator buckets, crusher liners |
3–5× longer lifespan vs. Q345B |
|
Construction Equipment |
Bulldozer blades, mixer blades |
>50% reduction in downtime |
|
Material Handling |
Chute liners, conveyor housings |
40% lower annual maintenance costs |
|
Agricultural Machinery |
Subsoiler blades, harvester guards |
30% higher operational efficiency |
NM450 vs. Mn13 (High Manganese Steel)
|
Parameter |
NM450 |
Mn13 (ZGMn13) |
|
Hardness |
Initial hardness: 450 HBW |
Low initial hardness (200 HBW), work-hardens up to 550 HBW |
|
Wear Resistance |
Optimal for sliding/rolling wear |
Superior under extreme impact (e.g., abrasive crushing) |
|
Processability |
Requires preheated bending/welding |
Cold bending possible (prone to work hardening) |
|
Cost |
RMB 6,500–8,500/ton |
RMB 10,000–15,000/ton |
lection Criteria:
- NM450: Sliding/rolling wear (e.g., conveyor liners).
- Mn13: Severe impact + abrasive wear (e.g., crusher mantles, shot blasting liners).
Mechanical Properties (GB/T 24186)
|
Property |
Standard Requirement |
Typical Values |
|
Tensile Strength (MPa) |
≥1,400 |
1,450–1,550 |
|
Yield Strength (MPa) |
≥1,200 |
1,250–1,350 |
|
Elongation (A5, %) |
≥10 |
12–15 |
|
Impact Energy (-20°C, J) |
≥24 |
28–35 |
|
Hardness Tolerance (HBW) |
±40 |
±20 (premium grade) |
Case Study: LCC Analysis in Lithium Ore Crushing Systems
Project: Atacama Salt Lake (Chile) spodumene crushing line (200 t/h capacity).
- Baseline: Hardox450 liners (replaced every 6 months).
- NM450 Solution:
- Service life extended to 8 months.
- Maintenance cost reduced by $1.2/ton.
- 10-Year LCC Savings:
- Present value: $2.3M (8% discount rate).
- ROI: 217%.
NM450 outperforms traditional solutions in wear resistance, cost-efficiency, and sustainability, making it ideal for high-wear industries like lithium mining.
Procurement Guidelines
Thickness Selection:
- Formula: Minimum thickness = (Annual wear rate × Lifespan) ÷ Safety factor (1.5–2).
- Example: 4 mm/year × 5 years → 30 mm plate (4×5×1.5).
Quality Verification:
- Mandatory documents: Mill test certificates, third-party inspection reports.
- On-site testing: Portable Brinell hardness tester (10 mm ball, 3,000 kg load).
Processing Coordination:
- Optimize material usage with nesting software.
- Pre-cut plates >50 mm thick to minimize residual stress.
Pricing Strategy
|
Factor |
Price Range |
Optimization Tips |
|
Base Price |
RMB 6,500–8,000/ton |
Secure quarterly mill contracts |
|
Alloy Surcharge |
RMB 300–800/ton |
Monitor Cr/Mo futures |
|
Non-Standard Sizes |
+5–15% |
Prioritize 1,500/2,000 mm widths |
|
Logistics |
RMB 200–600/ton |
Full-container load (24–28 tons/20GP) |
Procurement Checklist
Technical Confirmation:
-
Define wear type (third-party analysis recommended).
-
Request supplier case studies.
Supplier Selection:
-
Partner with experienced agents for technical support and logistics.
-
Verify lead times (72-hour delivery for standard sizes).
Cost Optimization
-
Hybrid designs (e.g., NM450 + Q345B composite structures).
Conclusion：Use NM450 to Enhance Your Project
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In summary, NM450 steel is one of the most reliable materials for applications that require strength, hardness, and toughness. From construction machinery to mining machinery, its versatility in high-performance environments ensures that it remains the preferred choice in various industries. The ability of NM450 enables its performance to meet specific project requirements, ensuring optimal performance and reliability.
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When choosing NM450 for your project, please be sure to consider application requirements, cost, and supplier selection. A suitable NM450 can improve the quality and efficiency of components, ensuring the long-term success of the project. By collaborating with trusted suppliers and thoroughly understanding the materials, you can confidently incorporate NM450 into your manufacturing process for excellent results.
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