Baja Plat Ar
| Comparison Aspect | Chinese NM Plate | Foreign AR Plate |
|---|---|---|
| Sistem Standar | GB/T 24186 | ASTM / DI DALAM |
| Naming Principle | NM + Kekerasan (PBR) | AR + Kekerasan (PBR) |
| Rentang Kekerasan | 360–550HB | 360–600HB |
| Kekerasan & Sifat mampu bentuk | Lebih tinggi | Sedang |
| Dimensional Tolerance | Slightly wider | More precise |
| Kemampuan las | Lebih mudah | Requires strict control |
| Efisiensi Biaya | Tinggi | Sedang hingga tinggi |
| Performance Consistency | Bagus | Bagus sekali |
In conclusion, both NM Dan AR plate steels serve the same functional purpose—resisting abrasion and impact in heavy-duty environments.
Cina NM wear plates are valued for their balanced cost, kekerasan, and processability, making them suitable for general and medium-duty wear applications.
Foreign AR grades menawarkan more consistent mechanical performance and tighter hardness control, preferred in high-performance or safety-critical industries.
- Keterangan
Baja pelat AR (Pelat baja tahan abrasi) is a type of high-strength, wear-resistant steel designed to perform under conditions of heavy abrasion, keausan geser, dan dampak. Ini banyak digunakan dalam peralatan pertambangan, mesin konstruksi, transportation systems, dan aplikasi penanganan material.
Around the world, AR steel is classified under different systems and standards. Di Tiongkok, itu seri NM (for example, NM360, NM400, NM500) is the most common standard. In other regions such as Europe and North America, the most common grades are AR400, AR450, AR500, Dan AR600, among others.
Although they share similar purposes, these grades differ in terms of standard systems, Komposisi Kimia, rentang kekerasan, mechanical performance, and fabrication properties.
1. Standard Systems and Designations
| Wilayah | Nilai Umum | Main Standard |
|---|---|---|
| Cina | NM360, NM400, NM450, NM500, NM550 | GB/T 24186 (Wear-Resistant Steel Plate Standard) |
| Eropa / Amerika Serikat | AR400, AR450, AR500, AR600 | ASTM, DI DALAM, or proprietary wear-resistant plate standards |
NM singkatan dari “Nai Mo” (Tahan aus) dalam bahasa Cina, meaning “wear-resistant.”
AR singkatan dari “Abrasion Resistant.”
Although both systems indicate similar hardness levels (the numbers roughly correspond to Brinell hardness), itu testing methods and tolerance ranges differ slightly, so the grades are not always interchangeable.
2. Komposisi Kimia
Cina NM series plates typically have a carbon content of 0.18–0.30% and alloying elements such as M N, Kr, Mo, dan Ni to improve hardenability and toughness.
Foreign AR plates, depending on the producer and standard, may include optimized microalloying with Boron (B) atau Vanadium (V) for enhanced wear resistance and welding performance.
| Elemen | Chinese NM Series | Foreign AR Series |
|---|---|---|
| Karbon (C) | Sedang (0.18–0.30%) | Sedang hingga tinggi (0.20–0.32%) |
| mangan (M N) | 1.0–1.6% | 0.8–1.6% |
| Kromium (Kr) | 0.3–1,5% | 0.3–1.0% |
| Molibdenum (Mo) | Opsional | Often included |
| Boron (B) | Rare | Frequently used in AR grades |
Foreign AR plates often rely on precision alloying and microstructure control, while Chinese NM plates focus on balance between strength, kekerasan, dan efisiensi biaya.
3. Kekerasan dan Sifat Mekanik
Both AR and NM grades use the numeric designation to represent approximate Kekerasan Brinell (PBR). Namun, differences exist in the exact hardness range and mechanical properties.
| Nilai | Kekerasan (PBR) | Typical Tensile Strength (MPa) | Energi Dampak (J, -40°C) |
|---|---|---|---|
| NM360 | 360 ± 30 | 900–1100 | ≥30 |
| NM400 | 400 ± 30 | 1200–1400 | ≥27 |
| NM500 | 500 ± 30 | 1500–1700 | ≥20 |
| AR400 | 360–440 | 1100–1250 | ≥20 |
| AR500 | 470–540 | 1450–1700 | ≥15 |
Umumnya:
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Chinese NM plates have slightly wider hardness tolerance Dan better impact toughness, making them easier to process (memotong, las, and form).
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Foreign AR plates are more uniform in hardness and wear resistance, with tighter quality control for consistent performance in extreme environments.
4. Processing and Welding Differences
Chinese NM plates are often designed for easier fabrication, especially in applications requiring frequent cutting, pembengkokan, atau pengelasan.
Foreign AR grades, due to higher alloying and tighter hardness control, may have more stringent welding requirements, including preheating and specific filler metal recommendations.
| Milik | Chinese NM Series | Foreign AR Series |
|---|---|---|
| Pemotongan | Good machinability | Requires high-quality tools |
| Bending/Forming | Lebih mudah, lower springback | Requires higher force |
| Pengelasan | More tolerant to heat input | Needs controlled welding procedure |
| Permukaan Selesai | Standard mill finish | Often smoother, refined surface |
5. Perbandingan Aplikasi
| Industri | Common Chinese Grades | Common Foreign Grades |
|---|---|---|
| Penambangan dan Penggalian | NM400, NM500 | AR450, AR500 |
| Mesin Konstruksi | NM360, NM400 | AR400 |
| Cement and Aggregate | NM400 | AR450 |
| Transportation Equipment | NM500, NM550 | AR500, AR600 |
Both systems serve the same industries, Tetapi NM plates are more cost-efficient and widely available in Asian markets, ketika AR plates dominate in Europe, Amerika Utara, and regions with high-quality certification requirements.
