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GB/T 24186 is the national standard for high-strength wear-resistant steel plates and steel strips f
The chemical composition design of the GB/T 24186 standard mainly considers factors such as the wear resistance, hardness, weldability, formability and impact toughness of the material. Specific chemical components include carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti) and boron (B) and other elements. In specific grades such as NM300 and NM300D/E, the contents of these chemical elements are clearly defined, such as C content at about 0.23%, Si content at about 0.70%, Mn content at about 1.60%, etc. At the same time, the standard also stipulates the content range of acid-soluble aluminum (Als), as well as the upper and lower limits of other alloying elements.
The production of wear-resistant steel plates usually involves the following main steps: steelmaking, continuous casting, hot rolling, heat treatment, cutting and straightening, surface treatment, inspection and packaging. Finally, the steel plates need to undergo strict inspection to ensure that they comply with GB/T 24186 Standard requirements. After passing the inspection, the steel plates will be packed and prepared for shipment.
The characteristics of the GB/T 24186 standard are mainly reflected in the following aspects:
1. Chemical composition design: By using a lower carbon content, the steel plate can obtain higher hardness after quenching while maintaining sufficient plasticity and toughness to meet the comprehensive mechanical performance requirements of engineering machinery.
2. Grade expression method: The grade expression method in the GB/T 24186 standard is very clear. For example, NM represents the first letter of the Chinese pinyin for wear resistance, the following number represents the surface pinell hardness, and D or E represents the quality grade.
3. Quality requirements: The standard not only has clear requirements for chemical composition, but also adds requirements for cross-section center hardness, bending performance, low-temperature toughness, etc. Especially for steel plates that require low-temperature toughness, the impact temperature requirements are clarified in the standard.
4. Thickness range: GB/T 24186 standard is applicable to single-rolled steel plates with a thickness of no more than 120mm and steel strips with a thickness of no more than 25.4mm. This range can meet the needs of most wear-resistant structural parts of engineering machinery.
5. Smelting method: Steel is smelted in a converter or electric furnace and refined outside the furnace. This smelting method can ensure that the chemical composition and performance of the product meet standard requirements.
The GB/T 24186 standard is mainly used in wear-resistant structural components of engineering machinery such as mining, construction, and agriculture. Although this standard is mainly aimed at engineering machinery in mining, construction, agriculture and other fields, wear-resistant steel plates and steel strips used in other fields can also be used as a reference.
