The “AR” prefix is mostly used in American standards or export trade contexts. In China and Europe, prefixes such as “NM”, “HARDOX”, and “XAR” are commonly used; the numbers represent the nominal Brinell hardness value (HBW).
Selecting such AR400 400hbw High Abrasion Resistant Steel Plate can effectively slow down the wear rate and reduce the frequency of equipment downtime and maintenance. It is worth noting that the final performance of the material is closely related to subsequent processing techniques, such as cutting, welding and shaping. Improper processing may damage its original structure and performance.
AR400 is the code for a general wear-resistant steel. Different steel mills (such as SSAB Hardox, Thyssen XAR, domestic NM400, etc.) have slightly different compositions. The core is a low-carbon low-alloy system. The typical melting analysis upper limit is as follows:
| 符号 | 含量上限（%） | ||
|---|---|---|---|
| C | ≤0.20~0.21 | ||
| Si | ≤0.70~0.80 | ||
| Mn | ≤1.50~1.60 | ||
| P | ≤0.025 | ||
| S | ≤0.010~0.012 | ||
| Cr | ≤0.50~1.00 | ||
| Mo | ≤0.25~0.50 | ||
| Ni | ≤0.50 | ||
| B | ≤0.005 |
| performance index | Typical values/range | Rated value: 400. Measurement taken 1mm beneath the surface. | |
|---|---|---|---|
| Brinell Hardness (HBW) | 370 – 430 | Rated value: 400. Measurement taken 1mm beneath the surface. | |
| Tensile strength (Rm) | ≥ 1100 – 1250 MPa | Thickness ≤ 50mm (typical value), the imported brand can reach 1250 MPa | |
| Yield strength (Re/Rel) | ≥ 900 – 1050 MPa | Quenching and tempering treatment. Some standards do not mandate strict guarantees of only maintaining hardness. | |
| Post-fracture elongation (A) | ≥ 10% – 12% | Based on a 20mm thick sample, longitudinal sampling was conducted. | |
| Impact toughness (KV2) | ≥ 24 – 45 J | -20℃ (according to national standard) or -40℃ (imported) V-shaped notch | |
| Cold Bending Property | 180° – No cracking | The diameter of the bend core is d = 2a to 3a (a represents the thickness of the sample) | |
From a microscopic perspective, the base material of the AR400 Steel Plate is typically low-carbon steel, which provides the necessary toughness support for the plate. During the heat treatment process, the AR400 Steel is heated to the austenitization temperature and held for an adequate period of time to allow carbon and other alloy elements to fully dissolve. The subsequent rapid cooling process inhibits the equilibrium transformation, causing a structure dominated by lamellar martensite to form within the AR400 High Wear Impact-Resistant Plate. This martensite structure has the characteristic of high hardness and is the main barrier against wear. It is worth noting that AR400 Steel Plate Hardness 360-444 Brinell hardness is not the most critical microscopic factor determining wear resistance; rather, the uniformity of the structure, the morphology of carbides, and the content of residual austenite collectively constitute a complex anti-wear system.
In terms of macroscopic properties, this type of AR400 400hbw High Abrasion Resistant Steel Plate exhibits a combination of high surface hardness and good toughness in the core. Its AR400 Abrasion Resistant Plates Brinell hardness typically reaches approximately the 400HBW range, providing a foundation for resisting wear mechanisms such as Ar400 400hbw Wear Resistant Steel Plate erosion and microscopic cutting. Under dynamic loads or impact conditions, the internal toughness of the material helps to inhibit crack initiation and propagation, preventing brittle spalling, thereby extending the service life in actual operation. This performance combination distinguishes it from tool steels that solely pursue high hardness or structural steels that emphasize toughness alone.
Ar400 Plate—-Size
Thickness: 3mm – 80mm (some domestic products can reach up to 100mm+, imported ones such as Hardox 400 typically range from 3mm to 78mm)
Width: 1500mm, 1800mm, 2000mm, 2200mm, 2500mm
Panjang: 6000mm, 8000mm, 10000mm, 12000mm (can be cut to the required length as needed)
Abrasion Resistant Steel Plate AR400—-Application fields
• Yellow goods category (such as construction, earthmoving machinery, mobile cranes, etc.);
• Special machinery (such as construction equipment for roads, recycling equipment, etc.);
• Component manufacturing (such as cutting tools, excavator buckets, screens, chutes, rollers, etc.).
How to choose the appropriate model of AR400 wear-resistant plate?
When selecting high-quality AR400 steel plates, one should follow the engineering logic that is derived from the application end, rather than simply comparing prices or hardness values.
High-quality machining involves clearly defining the process parameters: the main types of wear (impact, abrasion, compression), the magnitude and frequency of the impact energy, the pressure load it withstands, the working environment (temperature, humidity, corrosiveness), and the required subsequent processing methods (especially the welding requirements).
How to distinguish the authenticity of AR400 wear-resistant plate?
To assess the quality of the steel plates, it is necessary to rely on an objective technical evidence chain:
What is the price of the AR400 wear-resistant plate?
From the perspective of initial investment, the price of AR400 wear-resistant plate is indeed higher than that of ordinary steel, possibly costing several thousand yuan per ton. However, when evaluating the economic performance of the material, we cannot only consider the purchase cost, but should also take into account the service life, maintenance costs and equipment downtime losses.
Is AR400 classified as high-strength steel or wear-resistant steel?
“High-strength wear-resistant steel”
What are the differences between AR400 and ordinary structural steel?
AR400 is a low-alloy high-strength wear-resistant steel with a Brinell hardness of approximately 400HB. It is specially designed for high-wear conditions. Ordinary structural steel (such as Q235) is a general building material guided by yield strength, with low hardness and poor wear resistance. The core difference between the two lies in the alloy design goal, hardness/maintenance of wear resistance, and applicable scenarios.
What are the differences between AR400 and AR450, AR500?
| Dimensionality | AR400 | AR450 | AR500 |
|---|---|---|---|
| Hardness index | About 400 HB | Approximately 450 HB | About 500 HB |
| wear-resisting property | Medium, suitable for general wear environments | Higher, suitable for moderate to severe wear and tear | Extremely high, suitable for extremely severe wear conditions |
| typical application | Containers, general structural components, light-load conveying equipment | Excavator buckets, dump truck linings, agricultural machinery | Mining machinery, crusher components, ballistic protection, heavy-load working conditions |
| processing characteristics | The welding and cutting performance are excellent, and the forming property is good. | Welding requires preheating, and the difficulty of cutting slightly increases | The welding requirements are high (requiring strict procedures), cold processing is difficult, and mostly thermal processing is adopted. |
| Intensity trend | Basic wear resistance strength | The yield/tensile strength is approximately 12.5% higher than that of AR400 | The yield/tensile strength is approximately 25% higher than that of AR400 |
What is the typical lifespan of the AR400?
What are the differences in the AR400 production process among different steel mills?
AR400 is not a specific brand exclusive to a certain steel mill. Instead, it is the code name for a wear-resistant steel in the American AISI standard (corresponding to NM400 in China, Hardox 400 in Sweden, etc.). The core production processes of each steel mill are consistent (smelting in a converter/electric furnace + refining + continuous casting + controlled rolling + quenching and tempering), with the main differences lying in alloy fine-tuning, heat treatment parameter control, and purity management strategies.
Why is the production of thick plates more difficult with AR400?
The production of AR400 thick plates is more challenging. The key issue lies in the uneven cooling of the cross-section, which results in insufficient hardness in the core, incomplete transformation of the microstructure, and extremely difficult control of the plate shape. It is difficult to simultaneously meet the requirements of a hardness of ≥ 400HB throughout the thickness and the toughness index.
Can AR400 replace NM400?
TIDAK
What are the differences between AR400 and the Chinese NM400?
The core performance of AR400 and NM400 (with hardness ranging from 360 to 450 HB, quenched and tempered state, and for wear-resistant applications) is basically the same. The main differences lie in the naming system/execution standards being different and some minor adjustments to the component ratios by certain manufacturers. They represent different grades of the same material.
What are the differences between AR400 and Hardox 400?
If the application scenario has strict requirements for wear resistance life consistency, complex structure welding or lightweight bending (such as for high-end excavator buckets or dump truck compartments), then Hardox 400 is the preferred choice. If it is only a general wear-resistant plate and cost is a concern, the AR400 produced by regular steel mills can meet the basic needs, but it is necessary to strictly inspect the hardness upon entry into the warehouse and obtain the flaw detection report.
What are the differences between AR400 and Raex 400?
The price range of AR400 is quite wide (domestic products start at approximately 5800 yuan per ton, while imported American standards are higher). It has a high cost-performance ratio. Raex 400, as an imported high-end brand, has a significantly higher price than ordinary domestic Ar400 400hbw Wear Resistant Steel Plate. It focuses on providing a lifespan guarantee under extreme wear conditions.
What are the differences between AR400 and XAR 400?
The Alloy Wear Plate AR400 can be produced by various parties such as Wudang Steel, Baosteel, and importers in accordance with common standards (such as ASTM A829/JIS, etc.); while the XAR400 is only produced by the German ThyssenKrupp Steel Plant.
Where is the quality gap between the Chinese AR400 and the imported AR400?
The NM400 produced by state-owned enterprises at the head level (such as Wugang and Baowu) has largely replaced imported products under normal conditions. The main gap lies in ultra-low temperature, ultra-thick plates, and scenarios with high reliability requirements.
Why is the import price of AR400 higher?
The higher import price of AR400 mainly stems from factors such as tariffs, logistics costs, premium for original factory craftsmanship, and the accumulation of supply chain costs, rather than being solely due to brand factors.
How to choose between the domestic AR400 and the imported AR400?
The main differences between domestic and imported “AR400” lie in the standard system, performance stability and cost: Domestic products follow GB/T 16270 or enterprise standards (often对标 NM400), with a wide hardness range (360-450HBW)， and have high cost performance； imported ones (such as Hardox 400 from Sweden and Abrasion Resistant Steel Plate AR400 from the United States) follow strict standards like ASTM/SSAB， with better uniformity of hardness， toughness and welding processability， but the price is usually 1.5-2 times that of domestic products and the delivery time is longer.
How to reduce the procurement cost of Ar400 Plate?
The core of reducing the procurement cost of AR400 (high-strength wear-resistant steel plate) lies in: Based on the Total Cost of Ownership (TCO) strategy, structural cost reduction can be achieved through centralized purchasing for scale-based bargaining, promoting material/process optimization at the design stage, locking in long-term agreements, and optimizing logistics inventory, rather than simply lowering the unit price.
Is the price of AR400 higher as the thickness increases?
yes
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