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Production method of high-hardness steel sheet for rolling wheel of road roller

A production method and high-hardness technology, applied in the field of steelmaking, can solve the problems of low roller hardness, loose meat, and prone to pits, etc., and achieve the effects of large wealth, stable low-temperature impact performance and excellent performance.

Inactive Publication Date: 2019-01-01
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, due to the low hardness of roller rollers, surface defects such as pits and meat loss are prone to appear during use

Method used

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  • Production method of high-hardness steel sheet for rolling wheel of road roller
  • Production method of high-hardness steel sheet for rolling wheel of road roller

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Embodiment Construction

[0017] The steel plate of the embodiment is a high hardness and high toughness Q345B steel plate with a thickness of 20 mm to 60 mm, which is used for rollers of road rollers with guaranteed hardness and performance. The production process is converter smelting → LF refining → VD vacuum treatment → continuous casting → slab heating → controlled rolling → controlled cooling . The chemical composition of each embodiment is shown in Table 1, and others are Fe and residual elements.

[0018] In the converter smelting, ensure that the tapping carbon is ≥ 0.06, the tapping P is ≤ 0.015, and the tapping temperature is ≥ 1580°C; avoid slag during the tapping process; in the LF refining, ensure that the white slag retention time is controlled above 20 minutes ; In the vacuum refining, the vacuum time under ≤ 67Pa is ≥ 23min, and the calcium treatment is carried out after the VD is broken; The heat is controlled at 15-25°C, and the slab is cooled for more than 24 hours after it comes o...

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Abstract

The invention relates to a production method of a high-hardness and high-toughness steel sheet for a rolling wheel of a road roller. The steel comprises the following chemical components in percentageby mass: 0.16 to 0.20% of C (carbon), 0.20 to 0.50% of Si (silicon), 1.35 to 1.45% of Mn (manganese), 0.020% or less of P (phosphor), 0.010% or less of S (sulfur), 0.020 to 0.050% of Al (aluminum), and the balance of Fe (iron) and residue elements. The production method comprises the production process with the following steps of smelting by a converter, LF (ladle furnace) refining, VD (vacuum distillation) vacuum treatment, continuous casting, heating of sheet blanks, controlling of rolling, controlling of cooling, and finishing. The production method has the advantage that by implementing the whole process from pretreatment of hot metal through controlling of cooling of steel sheets to finishing, the quality properties of the physical product are excellent, namely that the yield marginof steel sheet is 50MPa or above, the tensile margin is 80 to 100MPa, and the Brinell hardness is 170HB or above; the low-temperature impact property is stable, and the margin is high.

Description

technical field [0001] The invention relates to the technical field of steelmaking, and specifically relates to a method for producing high-hardness and high-toughness steel plate Q345B steel used for road roller rollers. Background technique [0002] Roller steel for road rollers is mainly used in the construction machinery industry to manufacture rollers for road rollers used in various environments such as soft mud, gravel, and slag. [0003] At present, due to the low hardness of road roller rollers, surface defects such as pits and meat loss are prone to appear during use. In the design of some construction machinery, in order to stabilize the surface quality of roller rollers during service, the Q345B steel plate used for roller rollers must not only meet the requirements of GB / T1591-2008, but also ensure that the hardness of the steel plate reaches 170HB or more, and is resistant to 0°C low temperature. High demands are placed on impact performance, etc. [0004] Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02B22D11/16C21C7/076C21C7/10
CPCB22D11/16C21C7/0006C21C7/076C21C7/10C21C2007/0093C21D8/0205C21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/06Y02P10/20
Inventor 张勇伟周光杰陈钊易炜张军唐勇勇
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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