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A high-speed steel section steel finished roll and its preparation method

A technology for finished steel and high-speed steel, which is applied in the field of finished high-speed steel section steel rolls and their preparation, can solve the problems of micro-concave indentation, pass failure section steel surface quality, large extrusion load, etc., achieves fewer defects and saves metal consumption , the effect of reducing the grain growth rate

Active Publication Date: 2018-10-02
江苏凯达重工股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Traditional pearlitic and bainite ductile iron rolls roll large and medium-sized channel steel, angle steel, spherical flat steel, and some sections of the side wall part of the mining U-shaped pass groove bottom angle upwards wear quickly due to large extrusion loads. Dimple indentation occurs, leading to early failure of the pass pattern and problems with the surface quality of the section steel

Method used

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  • A high-speed steel section steel finished roll and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] [Example 1] The structure of the high-speed steel section steel finished roll of the present embodiment is as follows figure 1 Shown: the assembly of a kind of high-speed steel shaped steel finished roll of the present embodiment: comprise two working layer matrix organizations are: Cr 23 C 6 、Mo 2 C 6 , NbC, V 4 C 3 Fine eutectic granular carbide + bainite + martensite high-speed steel section steel finished rolls, one of which is used as the main shaft 1, and the other is used as the auxiliary shaft 2, and the two mesh with each other; the main shaft includes the roll body 1 located in the middle -1 and the roll neck 1-2 located at both ends of the roll body 1-1, the bearing stop roll neck 1-3; the auxiliary shaft includes the roll body 2-1 located in the middle and the roll neck 2-2 located at the two ends of the roll body 2-1 , Bearing stop roll neck 2-3.

[0028] The main shaft 1 roll body 1-1 of the assembly of the roll includes 5 protrusions around the roll...

Embodiment 2

[0040] [Example 2] The chemical composition of each layer of the high-speed steel section steel roll is: Configuration 1C: 1.50; Si: 1.40; Mn: 0.35%; Cr: 1.95%; Ni: 3.10%; Mo: 4.30%; V: 2.85% ; W: 1.10%; Nb: 0.20%; P: 0.02%; S: 0.02%; configuration 2C: 3.30%; Si: 1.70%; 3.10%; Si: 2.25%; Mn: 0.33%; Cr: 0.12%; Ni: 0.021%; Mg: 0.06%; the rest is Fe and unavoidable trace impurities.

[0041] The design value of the hardness of the working layer of the high-speed steel section steel roll is 70-80HSD, and the actual product is 77.5HSD; the design value of the hardness drop from the roll surface to the bottom of the groove is ≤1.5HSD, and the actual product is 1.1HSD; The design value of the tensile strength of the working layer of the steel-shaped steel roll is ≥480MPa, and the measured value of the physical product is 510MPa; the design value of the tensile strength of the core part is ≥450MPa, and the measured value of the physical product is 480MPa.

[0042] The third step is t...

Embodiment 3

[0043] [Example 3] The chemical composition of each layer of the high-speed steel section steel roll is: configuration 1C: 1.60%; Si: 1.60%; Mn: 0.50%; Cr: 1.90%; Ni: 3.00%; Mo: 4.30%; V: 2.90%; W: 0.85%; Nb: 0.20%; P: 0.01%; S: 0.015%; Configuration 2C: 3.40%; Si: 1.70%; 3C: 3.40%; Si: 2.20%; Mn: 0.35%; Cr: 0.15%; Ni: 0.025%; Mg: 0.06%; the rest is Fe and unavoidable trace impurities.

[0044] The design value of the hardness of the working layer of the high-speed steel section steel roll is 70-80HSD, and the actual product is 77.3HSD; the design value of the hardness drop from the roll surface to the bottom of the groove is ≤1.5HSD, and the actual product is 1.32HSD; The design value of the tensile strength of the working layer of the steel-shaped steel roll is ≥480MPa, and the measured value of the physical product is 525MPa; the design value of the tensile strength of the core part is ≥450MPa, and the measured value of the physical product is 468MPa.

[0045] The third st...

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Abstract

The invention relates to a high-speed steel and section steel finished roller and a preparation method thereof. According to the high-speed steel and section steel finished roller and the preparation method thereof, first configuration, second configuration and third configuration are adopted for chemical components of the outer layer, chemical components of the middle layer and chemical components of the center part of the roller respectively; and then smelted molten steel meeting requirements is poured into a high-speed steel and section steel roller mold in a centrifugal and composite mode, and then the thickness, the hardness, the tensile strength and the matrix structure of the working layer of the roller can be obtained through special heat treatment. Compared with common section steel rollers, the high-speed steel and section steel finished roller has the advantages that the wear resistance (the uniformity), the impact toughness, the thermal fatigue resistance and the tensile strength are improved, the service life of the high-speed steel and section steel roller is prolonged, and the surface quality of the high-speed steel and section steel roller is improved.

Description

technical field [0001] The invention relates to a high-speed steel section steel finished roll and a preparation method thereof. Background technique [0002] Traditional pearlitic and bainite ductile iron rolls roll large and medium-sized channel steel, angle steel, spherical flat steel, and some sections of the side wall part of the mining U-shaped pass groove bottom angle upwards wear quickly due to large extrusion loads. Micro concave indentation occurs, leading to early failure of the pass pattern and problems with the surface quality of the section steel. Therefore, it is necessary to develop a method of optimizing the allocation of special carbide elements vanadium, tungsten, molybdenum, chromium, and strong and tough elements niobium and nickel, and rolls manufactured by centrifugal composite casting. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the present invention firstly provides a technical proposal for a high-speed steel se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B27/02C22C38/04C22C38/02C22C38/44C22C38/46C22C38/48C22C38/34C22C37/10C22C37/08C22C37/06C21D9/38
CPCB21B27/02C21D9/38C21D2211/002C21D2211/004C21D2211/008C22C37/06C22C37/08C22C37/10C22C38/02C22C38/04C22C38/34C22C38/44C22C38/46C22C38/48
Inventor 许健周国祥蒋志芳
Owner 江苏凯达重工股份有限公司
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