What are the classifications of wear-resistant steel
With the continuous expansion of industrial application scenarios and the growing requirements for equipment service life and work efficiency, wear-resistant steel must exhibit higher hardness and strength to withstand increased wear and impact. Simultaneously, there is a need for improved toughness and fatigue resistance, enabling wear-resistant steel to better adapt to complex working environments and frequent load changes. This article explores the classifications of wear-resistant steel tailored to different operational requirements.
High-quality tempered wear-resistant steel
High-quality tempered wear-resistant steel is the mainstream choice in the NM series of wear-resistant steel currently available in the market. This type of wear-resistant steel, particularly in thicknesses under 6 mm, is primarily utilized in lightweight dumper carriages, with the thinnest available specification being just 2 mm.
Top-Level Shape and Bending Properties
Our wear-resistant steel boasts exceptional shape and bending properties, ranking among the best domestically. Notably, it is the only cargo carriage that features both side walls and bottom plates made from 3 mm wear-resistant steel.
Advantages of Wear-Resistant Dump Trucks
The advantages of using wear-resistant dump trucks compared to traditional models are significant:
- Lightweight and Reduced Energy Consumption: Achieving a weight reduction of 50% compared to materials with a grade of 345 MPa, and a 33% reduction compared to those with 700 MPa.
- Enhanced Wear Resistance: The wear resistance of our materials is 3.5 times higher than that of traditional materials, resulting in longer service life and reduced maintenance requirements.
- Improved Anti-Smashing Performance: The carriage’s anti-smashing performance is enhanced across various working conditions, ensuring greater reliability and safety.wear-resistant steel, up to 4 times of national standard.
Steel Grade Comparison
| Steel Grade | Executive Standard | JFE | SSAB |
| NM400 | GB/T 24186-2022 | EH400 | HARDOX400 |
| NM450 | GB/T 24186-2022 | EH450 | HARDOX450 |
| NM500 | GB/T 24186-2022 | EH500 | HARDOX500 |
| NM550 | GB/T 24186-2022 | EH550 | HARDOX550 |
| NM600 | GB/T 24186-2022 | HARDOX600 |
Mechanical Properties
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A50% (%) | HBW Brinell Hardness | Available Specification (mm) |
| NM400 | ≥ 1000 (1150) | ≥ 1200 (1380) | ≥ 10 (16.4) | 370-430 (405) | 3.0-25.0 x 1000-2050 |
| NM450 | ≥ 1100 (1280) | ≥ 1250 (1490) | ≥ 7 (14.7) | 420-480 (452) | 3.0-25.0 x 1000-2050 |
| NM500 | ≥ 1200 (1380) | ≥ 1500 (1670) | ≥ 7 (14.3) | ≥ 470 (506) | 3.0-25.0 x 1000-2050 |
| NM550 | ≥ 1300 (1480) | ≥ 1650 | / | / | 4.0-25.0 x 1000-2050 |
| NM600 | ≥ 1750 | / | ≥ 5 | / | 4.0-25.0 x 1000-2050 |
The bottom plate and side wall of U-shaped groove dump truck are made of high quality tempered and wear-resistant steel NM450
High Toughness Crack-resistant and Wear-resistant Steel
High toughness crack-resistant and wear-resistant steel NM400Tuf-NM500Tuf, the latest upgrade of traditional wear-resistant steel, is the best strength and toughness matching wear-resistant steel for construction machinery in the domestic market, of which the cracking and crack propagation can be effectively inhibited by greatly improving impact toughness under the premise of ensuring the same level of product strength and hardness unchanged. The impact property of NM450Tuf at -20℃ can reach more than 100J, which is about 60%-80% higher than the traditional wear-resistant steel, up to 4 times of national standard.
| Steel Grades | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A50% (%) | HBW Brinell Hardness | Impact Energy (KV2, J) | Available Specification (mm) |
| NM400TuF | ≥ 1000 (1180) | ≥ 1200 (1390) | ≥ 10 (18.3) | 370-430 (405) | ≥ 48 (113) | 3.0-25.0 x 1000-2050 |
| NM450TuF | ≥ 1100 (1290) | ≥ 1300 (1540) | ≥ 7 (16.5) | 420-480 (453) | ≥ 48 (106) | 3.0-25.0 x 1000-2050 |
| NM500TuF | ≥ 1200 (1390) | ≥ 1500 (1680) | ≥ 5 (14.5) | ≥ 470 (508) | ≥ 38 (70) | 3.0-25.0 x 1000-2050 |
Carriage of dump truck for muck (NM450Tuf) and road transport mining dump truck(NM500Tuf)
Super wear-Resistant Steel
The wear resistance of the wear-resistant steel is enhanced by the precipitation of superhard TiC particles .Its hardness and mechanical properties are equivalent to those of NM450, but the wear resistance is 1.6 times more than that of ordinary NM450 and 1.3 times more than that of NM550. China Steel has successfully completed the task of “Industrial production of domestic extreme thin-gauge (4 × 2000mm) NM450SP” in the ” 13th Five-Year” national key research and development project, which has advantages of strong plastic toughness and improved wear resistance.
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A50% (%) | HBW Brinell Hardness | Available Specification (mm) |
| NM450SP | ≥ 1100 (1260) | ≥ 1300 (1480) | ≥ 7 (12.5) | 420-480 (453) | 3.0-25.0 x 1000-2050 |
Lining plate in cement mixing tank made of super wear-resistant steel NM450SP
Corrosion-resistant and Wear-resistant Steel
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A50% (%) | HBW Brinell Hardness | Available Specification (mm) |
| NMS450-1 | ≥ 1100 (1270) | ≥ 1300 (1560) | ≥ 7 (16.2) | ≥ 420 (458) | 3.0-25.0 x 1000-2000 |
| NMS450-2 | ≥ 1100 (1250) | ≥ 1300 (1450) | ≥ 7 (15.5) | ≥ 420 (448) | 3.0-25.0 x 1000-2000 |
Application of corrosion and wear resistant steel in dredged pipes (left) and sanitation trucks (right)
High Temperature and Wear Resistant Steel
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A50% (%) | HBW Brinell Hardness | Available Specification (mm) |
| NM450HTemp | ≥ 1100 (1260) | ≥ 1300 (1540) | ≥ 7 (15.6) | ≥ 420 (456) | 3.0-25.0 x 1000-2050 |
Blade made of heat and wear resistant steel NM450HiTemp: sand and stone heating drum (left) and recycled material heating drum (right)
Wear-resistant Steel for Concrete Mixer Drum
NM300TP can be stably produced with thin thickness of 3.0mm, with yield ratio, shape and other indicators come up to the domestic leading level. The application of ultra-thin and high strength NM300TP can greatly improve the core competitiveness of mixer products. The weight of the drum can be reduced by 30-40% compared with ordinary truck. The welding of the whole plate with a width of 1800mm can be reduced by more than 30% with the cutting decreased by more than 40%, and the manufacturing cost can be cut by more than 30%. At the same time, the service life of the carriage is 1-3 times higher than that of the traditional use of general carbon steel and high-strength steel, which reduces the cost in the process of vehicle operation.
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A50% (%) | HBW Brinell Hardness | Available Specification (mm) |
| NM300TP | 600-800 (660) | ≥ 900 (1080) | ≥ 8 (15.9) | ≥ 270 (302) | 3.0-5.0 x 1000-1800 |
The concrete mixer drum is made of low yielding strength ratio wear-resistant steel NM300TP
High Manganese Wear-resistant Steel
High manganese austenitic steel such as Mn13 and X120Mn12, Mn12 have good toughness and remarkable surface work hardening properties. Under strong impact load or extrusion load, the stressed surface is work hardened, and the surface hardness can be significantly increased from the initial HB200 to over HB750, while the core of steel plate still maintains good impact toughness. It is widely used in mining equipment, machinery manufacturing industry, such as shot blasting equipment, large-scale jaw crusher, etc.
Overlay welding of wear-resistant steel is a surface strengthening technology that improves the wear resistance of steel by welding a layer of wear-resistant material on the surface of the steel.Surfacing can be performed on the surfaces of steel components of different shapes and sizes according to specific wear-resistant requirements. It can be surfacing welded on parts that are prone to wear, such as wear-resistant alloys on the edges of excavator bucket teeth, while other parts maintain their original performance and save costs. The material of the surfacing layer is usually an alloy with high hardness and high wear resistance, such as tungsten carbide, high chromium alloy, etc., which can significantly improve the wear resistance, corrosion resistance and heat resistance of the components, making the components The service life is greatly extended under harsh working conditions.
Summarize
In order to adapt to different working environments and wear mechanisms, more types of wear-resistant steel products will be developed in the future. For example, high-temperature wear-resistant steel for high-temperature wear environments, corrosion-resistant wear-resistant steel for corrosive wear environments, high-wear-resistant and high-toughness wear-resistant steel for high-speed wear environments, etc., to meet the diverse needs of different industries and fields.
0 Comments