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A repairing heat treatment process for improving the performance of rough-rolled graphite steel rolls

A graphite steel and preparatory heat treatment technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as unsuitable repair heat treatment, increase time and cost, and complex process, achieve comprehensive recovery and improvement of mechanical properties, and improve production. Efficiency and service life extension effect

Active Publication Date: 2021-07-16
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Chinese patent CN201210171141.0 discloses a "heat treatment method for improving the mechanical properties of graphite free-cutting steel". By adopting the sub-temperature quenching-high temperature tempering process route, the internal stress of the quenched graphite free-cutting steel can be reduced and the brittleness can be reduced. , improve the plasticity, toughness and stability of the structure, so that the graphite free-cutting steel has good strength and toughness and high fatigue strength, and achieves the best performance. It overcomes the fatigue strength of the traditional free-cutting steel although it has excellent cutting performance Low problem
These patents use different methods to meet the needs of their working conditions by improving a certain aspect. However, some design heat treatment processes are too complicated, which increases time and cost; but these methods are not suitable for rough rolling. Working conditions and requirements of repair heat treatment for performance improvement of V1 frame graphite steel rolls

Method used

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  • A repairing heat treatment process for improving the performance of rough-rolled graphite steel rolls
  • A repairing heat treatment process for improving the performance of rough-rolled graphite steel rolls
  • A repairing heat treatment process for improving the performance of rough-rolled graphite steel rolls

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Embodiment 1

[0049] The specification of the graphite steel roller in this embodiment is Φ740mm*480, and the roller numbers are V1-SH001 and V1-SH002. The chemical composition and mass percentage are shown in Table 1.

[0050] The mass percentage (%) of each chemical composition of table 1

[0051] Element C Si mn P S Cr Ni Mo detection value 1.47 1.35 0.85 0.014 0.0041 0.73 1.21 0.39 Element V Nb Ti N co Sb W Fe detection value 0.01 0.01 0.03 <0.015

0.01 <0.01

0.02 margin

[0052] The specific implementation steps of the repair heat treatment process for improving the performance of the rough-rolled graphite steel roll are as follows:

[0053] 1. Select the V1 roll to be processed

[0054] The roll surface to be treated shall be inspected macroscopically to ensure that there are no defects such as large-scale cracks and peeling; the hardness shall be tested as the basis for repairing the hardness of the heat treat...

Embodiment 2

[0069] The specification of the graphite steel roller in this embodiment is Φ720mm*480, and the roller numbers are V1-SH003 and V1-SH004. The chemical composition and mass percentage are shown in Table 2.

[0070] The mass percentage (%) of each chemical composition of table 2

[0071] Element C Si mn P S Cr Ni Mo detection value 1.47 1.35 0.85 0.014 0.0041 0.73 1.21 0.39 Element V Nb Ti N co Sb W Fe detection value 0.01 0.01 0.03 <0.015

0.01 <0.01

0.02 margin

[0072] The specific implementation steps of the repair heat treatment process for improving the performance of the rough-rolled graphite steel roll are as follows:

[0073] 1. Select the V1 roll to be processed

[0074] The roll surface to be treated shall be inspected macroscopically to ensure that there are no defects such as large-scale cracks and peeling; the hardness shall be tested as the basis for repairing the hardness of the heat treat...

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Abstract

The invention provides a repairing heat treatment process for a graphite steel roll used on a preliminary rolling V1 stand. By adopting the repairing heat treatment process described above, the mechanical properties of the preliminary rolling V1 roll are fully restored and improved, and the service life is effectively extended, which solves the problems of stopping the roll, changing rolls, and breaking the roll at the end of the working layer due to cracks, wear, etc., and improves the performance. Increased production efficiency, reduced roll consumption and production costs.

Description

technical field [0001] The invention relates to a repairing heat treatment process of a graphite steel roll, in particular to a repairing heat treatment process of a graphite steel roll used on a preliminary rolling V1 stand. Background technique [0002] The blooming production line is responsible for rolling large steel ingots produced by steelmaking into round billets and square billets of the size required by steel rolling mills, providing billets for engine crankshafts and oil well pipes, re-opening large continuous casting billets, and using the roughing process Mission to improve the quality of finished products. [0003] The product structure of the blooming mill has changed from the original simple specifications and carbon steel products to a product structure with multiple specifications, alloy steel (bearing steel, high alloy steel for seamless steel pipe T91, H13, 2Cr13, etc.), and carbon steel. The preliminary rolling plant has a 6VH billet continuous rolling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/38C21D1/26C21D1/28C22C38/56C22C38/02C22C38/04C22C38/44
CPCC21D1/26C21D1/28C21D9/38C22C38/02C22C38/04C22C38/34C22C38/44C22C38/56
Inventor 瞿海霞曹琦顾廷权夏杨青吴琼张国星
Owner BAOSHAN IRON & STEEL CO LTD