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Repair heat treatment technology for improving performance of primary rolling graphite steel roller

A technology of graphite steel, preparatory heat treatment

Active Publication Date: 2020-02-07
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Repair heat treatment technology for improving performance of primary rolling graphite steel roller
  • Repair heat treatment technology for improving performance of primary rolling graphite steel roller
  • Repair heat treatment technology for improving performance of primary rolling graphite steel roller

Examples

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Comparison scheme
Effect test

Embodiment 1

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

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

[0051] ingredientC Si MnPSCr Ni Mo Detection value1.471.350.850.0140.00410.731.210.39 ingredientV Nb TiN Co SbW Fe Detection value0.010.010.03<0.015

0.01<0.01

0.02 margin

[0052] The specific implementation steps of the repair heat treatment process to improve the performance of the blooming graphite steel roll are:

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

[0054] Perform macro surface inspection on the roll to be treated, and no large-size cracks, no spalling and other defects; test the hardness as the basis for the hardness of the heat treatment process; ultrasonic detection of whether there are serious casting defects, crack defects, etc. inside the crack; no major defects In the case, proceed...

Embodiment 2

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

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

[0071] ingredientC Si MnPSCr Ni Mo Detection value1.471.350.850.0140.00410.731.210.39 ingredientV Nb TiN Co SbW Fe Detection value0.010.010.03<0.015

0.01<0.01

0.02 margin

[0072] The specific implementation steps of the repair heat treatment process to improve the performance of the blooming graphite steel roll are:

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

[0074] Perform macro surface inspection on the roll to be treated, and no large-size cracks, no spalling and other defects; test the hardness as the basis for the hardness of the heat treatment process; ultrasonic detection of whether there are serious casting defects, crack defects, etc. inside the crack; no major defects In the case, proc...

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Abstract

The invention provides a repair heat treatment technology of a graphite steel roller used in a primary rolling V1 rack. The repair heat treatment technology is adopted to realize the comprehensive recovery and improvement of the mechanical properties of a primary rolling V1 roller, the service life is effectively prolonged, the problems of machine stopping roller replacement and roller breaking due to cracks and abrasion at the tail end of a working layer are solved, the production efficiency is improved, roller consumption is reduced, and the production cost is lowered.

Description

Technical field [0001] The invention relates to a repair heat treatment process for graphite steel rolls, in particular to a repair heat treatment process for graphite steel rolls used on a blooming V1 stand. Background technique [0002] The blooming production line is responsible for rolling the large steel ingots produced by steelmaking into round bar billets and square billets of the size required by the steel rolling mill, providing billets for engine crankshafts and oil well pipes, re-opening the large continuous casting billets, and using the blooming 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 multi-specification, alloy steel (bearing steel, high alloy steel for seamless steel tubes T91, H13, 2Cr13, etc.), and carbon steel. The existing 6VH billet continuous rolling mill V1 roll (effective working layer diameter is Φ810-720...

Claims

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Application Information

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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