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A kind of high-hardness graphite steel section steel roll and preparation method thereof

A graphite steel, high hardness technology, applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems of rapid wear and affect the surface quality of the rolling output section steel, reduce wear, fine structure, and improve rolling output. Effect

Active Publication Date: 2018-02-16
江苏凯达重工股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The rolling of large and medium-sized steel is carried out in the state of one hole. Due to the different frictional pressures in the area of ​​the pass during rolling deformation, the wear ratio of the side wall surface at the 10-80mm upward angle of the bottom of the deep hole will often be promoted. Other parts are fast and prone to dimples, which directly affect the rolling output and the surface quality of the section steel

Method used

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  • A kind of high-hardness graphite steel section steel roll and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] [Example 1] The structure of the high-hardness graphite steel shaped steel roll of the present embodiment is as follows figure 1 Shown: the assembly of a kind of high-hardness graphite steel section steel roll of the present embodiment, it is characterized in that: comprise the high hardness graphite steel section steel roll of two matrix metallographic structures: graphite+fine-grained carbide+bainite , one of which is used as the main shaft 1, and the other is used as the auxiliary shaft 2, and the two are meshed with each other; the main shaft includes the roll body 1-1 located in the middle, the roll neck 1-2 located at both ends of the roll body 1-1, and the bearing stop roll neck 1-3; the auxiliary shaft includes a roll body 2-1 located in the middle, a roll neck 2-2 located at both ends of the roll body 2-1, and a bearing blocking roll neck 2-3.

[0029] The main shaft 1 roll body 1-1 of the assembly of the roll includes 3 grooves surrounding the roll body 1-1, a...

Embodiment 2

[0039] [Example 2] The chemical composition of the high-hardness graphite steel section steel roll is: C: 2.05%; Si: 1.45%; Mn: 1.10%; Cr: 1.70%; Ni: 1.95%; Mo: 0.65%; P : 0.010%; S: 0.015%; the balance is Fe.

[0040] The design value of the surface hardness of the high-hardness graphite steel-shaped steel roll body is 60-70HSC, and the measured value of the physical product is 63.2HSD; the design value of the tensile strength of the high-hardness graphite steel-shaped steel roll is ≥480MPa, and the measured value of the physical product is 503MPa .

[0041] Step 3. Hot unpacking heat treatment: when the roll reaches 650°C, heat unpack for special heat treatment, heat it at Acm+70°C for 24 hours, take it out of the furnace for water mist spray quenching, and temper it when it reaches 510°C, and the roll is qualified after testing finished product.

[0042] In the third step, when the roll is heated to 570°C, wrap the roll with 45mm thick mineral wool from the R of the two end...

Embodiment 3

[0043] [Example 3] The chemical composition of the high-hardness graphite steel section steel roll is: C: 2.10%; Si: 1.55%; Mn: 1.20%; Cr: 2.15%; Ni: 2.30%; Mo: 0.55%; P : 0.021%; S: 0.012%; the balance is Fe.

[0044] The design value of the surface hardness of the high-hardness graphite steel-shaped steel roll body is 60-70HSC, and the measured value of the physical product is 66.7HSD; the design value of the tensile strength of the high-hardness graphite steel-shaped steel roll is ≥ 480MPa, and the measured value of the physical product is 526MPa .

[0045] Step 3. Hot unpacking heat treatment: when the roll reaches 580°C, it is unpacked for special heat treatment, and it is kept at Acm+80°C for 24 hours, and then it is sprayed and quenched with water mist, and tempered at 580°C, and the roll is tested and qualified finished product.

[0046] In the third step, when the roll is heated to 565°C, wrap the roll with 50mm thick mineral wool from the R at both ends of the roll...

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Abstract

The invention relates to a high hardness graphite steel shape steel roller and a preparation method thereof. Pure semisteel liquid is adopted, based on the liquidus temperature, the temperature is increased to 55-65 DEG C, and the semisteel liquid is taken out from a furnace; 0.03% of aluminum is added for deoxygenation, still standing is conducted for 5-10 min, and then 0.50%-0.80% of CaSi alloys are added to be subjected to spheroidization; then inoculation is conducted through 0.40%-0.60% of BaCa inoculants, stirring is conducted for 0.5-1 min through an electromagnetic blender, and pouring is conducted; and when the temperature of the roller is 550-650 DEG C, a case is opened at the high temperature to conduct special heat treatment to the temperature of Acm+50 DEG C to Acm+80 DEG C, heat preservation is conducted for 24 h, the roller is taken out from the furnace to be subjected to water mist spray quenching, and when the temperature reaches 480-580 DEG C, tempering is conducted, the roller is detected, and a qualified finished product is obtained. Compared with a common shape steel roller, the high hardness graphite steel shape steel roller is characterized in that graphite is spherical and distributed uniformly, the roller is high in hardness, and hardness drop from the roller face to the hole-shaped groove bottom basically does not exist, so that the abrasion of all the hole-shaped parts occurs synchronously, therefore the product has very high strength, good abrasion resistance and heat fatigue crack resistant performance, and the service life is prolonged significantly.

Description

technical field [0001] The invention relates to a high-hardness graphite steel shaped steel roll and a preparation method thereof. Background technique [0002] The rolling of large and medium-sized steel is carried out in the state of one hole. Due to the different frictional pressures in the area of ​​the pass during rolling deformation, the wear ratio of the side wall surface at the 10-80mm upward angle of the bottom of the deep hole will often be promoted. Other parts are fast and prone to dimples, which directly affect the rolling output and the surface quality of the section steel. Therefore, it is necessary to develop a high-hardness graphite steel roll specially used for series large section steel rolling to solve the above-mentioned drawbacks. Contents of the invention [0003] Aiming at the above drawbacks, the present invention firstly provides a technical proposal for a high-hardness graphite steel section steel roll. [0004] A method for preparing a high-ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/56C22C38/44C22C38/04C22C38/02C21C7/06C21C7/00C21D1/18C21D1/70C21D9/38B21B27/02
CPCB21B27/02C21C7/0006C21C7/06C21D1/18C21D1/70C21D9/38C21D2211/002C21D2211/006C22C38/02C22C38/04C22C38/34C22C38/44C22C38/56
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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