HB500-level martensitic abrasion-resistant steel for shovel edge and machining method thereof
A technology of martensitic and wear-resistant steel, which is applied in the field of HB500 martensitic wear-resistant steel for blades and its processing field, can solve problems such as insufficient sliding wear resistance, achieve significant economic and social benefits, and increase precipitation Strengthening effect and the effect of less alloy addition
Inactive Publication Date: 2018-12-21
武汉钢铁有限公司
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Problems solved by technology
[0004] The main purpose of the present invention is to provide a kind of HB500 grade martensitic wear-resistant steel to solve the problem of insufficient sliding wear resistance of the wear-resistant steel currently used in the manufacture of wear-resistant parts such as shovel blades in China. Through composition design and process improvement, it can effectively Improve the hardness of the wear-resistant steel matrix structure, and achieve the effect of anti-sliding wear through fine grain strengthening and precipitation strengthening; and the manufacturing cost involved is low, the process is simple, and it is suitable for popularization and application
Method used
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Embodiment 1～5
[0030] The chemical composition of the HB500 grade martensitic wear-resistant steel described in Examples 1 to 5 is shown in Table 1, and the process parameters are shown in Table 2; the specific preparation method includes the following steps:
[0031] 1) Carry out molten iron desulfurization;
[0032] 2) Carry out converter smelting and continuous casting to obtain a continuous casting slab with a thickness of 250 mm;
[0033] 3) Conventional continuous casting and heating of the slab, the heating temperature is controlled at 1250-1280°C;
[0034] 4) Carry out controlled rolling and controlled cooling. The rolling temperature in the first stage is ≥1050°C, and the cumulative reduction rate is 70-80%. ≥800°C; opening and cooling temperature 700-750°C, cooling rate 20-25°C / s;
[0035] 5) Perform tempering heat treatment, tempering temperature: 200-250°C, tempering time: plate thickness mm×2min / mm+20min; air cooling.
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Abstract
The invention discloses HB500-level martensitic abrasion-resistant steel. The HB500-level martensitic abrasion-resistant steel comprises, by mass, 0.30%-0.40% of C, 0.25%-0.50% of Si, 0.30%-0.80% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, and 0.65%-1.15% of Cr, 0.55%-0.85% of Mo, 0.12%-0.20% of Ti, 0.002%-0.006% of B, 0.02%-0.05% of Als and the balance Fe and trace impurity elements. A C-Si-Mn-Mo-Cr alloy system and Ti-B microalloying composition design are adopted to achieve the effect of sliding abrasion resistance, so that the obtained steel shows excellentmechanical properties; and the related alloy addition amount is less, and the alloy cost is low; and meanwhile, a short process manufacturing process is adopted, so that the manufacturing process isgreatly simplified, and remarkable economic and social benefits are achieved.
Description
technical field [0001] The invention belongs to the field of wear-resistant steel manufacturing for mechanical engineering, and in particular relates to HB500 grade martensitic wear-resistant steel for shovel edges and a processing method thereof. Background technique [0002] Wear-resistant steel is mainly used in bulldozers, loaders, excavators, dump trucks and various mining machinery, grabs, stackers and reclaimers, and feeding bending structures. Due to the different working environments of different components, the wear conditions and wear mechanisms are also different. For example, the blade of the excavator grab (bucket) is mainly subject to sliding wear. However, ordinary wear-resistant steels have not targetedly improved the wear resistance under sliding wear conditions according to this wear condition, resulting in severe wear of the bucket edge, frequent maintenance and replacement, high cost of use and impact on production. [0003] Such as CN1865481A invented ...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/28C22C38/32C22C38/06C21D8/02
CPCC22C38/02C21D8/0205C21D8/0226C21D8/0247C21D2211/008C22C38/04C22C38/06C22C38/22C22C38/28C22C38/32
Inventor 李德发官计生严翔朱丛茂杨治争周千学罗毅
Owner 武汉钢铁有限公司
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