Laser heat treatment hardening method for steel pipe cast iron roll surface

A technology of laser heat treatment and cast iron rolls, which is applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve unsolved problems such as laser surface strengthening of seamless steel tube rolls, affecting the service life of rolls, and prone to cracks on the surface, etc., to achieve shortening Processing time, guaranteed hardness and wear resistance, and easy operation

Inactive Publication Date: 2013-10-16
山东万丰煤化工设备制造有限公司 +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the hardened layer obtained by laser phase transformation hardening treatment is relatively shallow, and cracks are prone to appear on the surface, which affects the service life of the roll
The content of the patent (01114853.5) involves the use of laser melting treatment technology to improve the surface properties of cast steel rolls, which significantly increases the steel passing capacity of cast steel rolls, but does not solve the problem of laser surface strengthening of seamless steel tube rolls

Method used

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  • Laser heat treatment hardening method for steel pipe cast iron roll surface
  • Laser heat treatment hardening method for steel pipe cast iron roll surface

Examples

Experimental program
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Embodiment

[0027] Laser Surface Hardening of Infinitely Chilled Cast Iron Rolls

[0028] First, take the infinite chilled roll used for rolling seamless steel pipe as the processing object, the central arc radius R=71.74mm, according to figure 1 The display is divided into 7 areas, of which the arc of area I is 10 degrees, the arc of area II is 20 degrees, the arc of area III is 35 degrees, the arc of area IV is 50 degrees, the arc of area V is 35 degrees, the arc of area VI is 20 degrees, and the arc of area VII is 10 degrees .

[0029] Secondly, install the roll to be treated on the workbench, use sandpaper or hand-held grinding wheel to derust the working surface of the roll, and clean the working surface of the roll with acetone until the surface is smooth and free of oil; The light-absorbing paint is evenly sprayed on the surface of the roll, and the thickness of the sprayed layer of the light-absorbing paint is about 0.05mm.

[0030] Then, the surface of the roll is laser hardene...

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Abstract

The invention relates to a laser heat treatment hardening method for a steel pipe cast iron roll surface. The method comprises the steps of dividing an arc roll surface into 3-9 areas, spraying light-absorbing coatings on cast iron roll to be processed, and heating the roll surface to a micro-melting state by high-energy laser beams. A laser strengthened layer obtained by the method is metallurgically combined with a matrix, and is advantageous in that crystal grains are refined obviously, the thickness of the hardening layer ranges from 0.3 mm to 1.0 mm, the hardness reaches HV 620-760, the laser strengthened layer has good wear-resistance performance, and the lifetime of the roll is improved for 1-5 times. Moreover, according to the method provided by the invention, no subsequent process is needed after the laser hardening treatment of the steel pipe cast iron roll, and production cost is reduced. The method is practical and reliable, is convenient for operation, is environment-friendly, and has a great popularization value and huge social benefits.

Description

technical field [0001] The invention belongs to the surface modification of steel pipe cast iron rolls, in particular to a new method for laser hardening heat treatment on the surface of steel pipe cast iron rolls. Background technique [0002] Steel tube mill rolls are different from other types of rolling mill rolls in that: (1) The surface defects and rough surfaces of the tube blank produced by the upper stand are difficult to eliminate on the subsequent stand, which means that the steel tube rolls used in all stands should be It has good wear resistance; (2) The surface and bottom of the roll pass should have uniform hardness and wear resistance, which is especially important for large-diameter pipes. Therefore, the hardness of the bottom of the pass is usually used as an important indicator to measure the quality of steel pipe rolls. [0003] Domestic rolls for rolling seamless steel pipes are mainly made by machining rod-shaped billets, that is, first cast into rod-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/09C21D9/38
Inventor 韩彬张成忠王勇孙宁姣孙丰收王永刚李美艳
Owner 山东万丰煤化工设备制造有限公司
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