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Steel BG80MnCr for steel balls of ball mill and preparation method of steel

A ball mill and steel ball technology, applied in the field of ball mill steel ball manufacturing, can solve the problems of large rolling mill resistance, strict requirements on the carbon segregation index of steel, and high content of P and S, so as to reduce the influence of steel resistance and improve the ratio of equiaxed crystals , to meet the effect of high density

Inactive Publication Date: 2020-04-14
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with imported ball mill steel, the steel composition design of ball mill steel in my country is basically the same, but the service life and quality of forged steel ball products are quite different, which cannot fully meet the production needs
[0003] The steel used in the production of ball mill steel balls in the prior art has the following defects: (1) the electric furnace continuous casting smelting rhythm is fast, and the content of P and S is high; (2) the alloy content of BG80MnCr steel is high, and the composition control of Si, Mn, and Cr is difficult; (3) Defects such as alloy composition segregation and porosity are prone to occur in the continuous casting process; (4) The alloy content is high, and the heating process is not easy to burn through; (5) The rolling process with high alloy content has greater resistance to the rolling mill; (5) Casting process Electromagnetic stirring in the middle crystallizer, electromagnetic stirring at the end, and dynamic light reduction, combined control of secondary cooling water volume control is difficult; (6) The carbon segregation index of steel is strictly required

Method used

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  • Steel BG80MnCr for steel balls of ball mill and preparation method of steel
  • Steel BG80MnCr for steel balls of ball mill and preparation method of steel
  • Steel BG80MnCr for steel balls of ball mill and preparation method of steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present embodiment ball mill steel ball steel BG80MnCr electric furnace continuous casting production process flow is:

[0020] Blast furnace molten iron→hot metal pretreatment→50t electric arc furnace smelting→refining furnace LF→vacuum degassing VD→casting 235×265 medium billet→stepping furnace heating→high pressure water descaling→800 roughing mill rolling→continuous rolling mill→ Slow cooling → finishing → flaw detection → inspection → storage.

[0021] 1. Electric arc furnace smelting: In the electric arc furnace smelting molten steel step, scrap steel and molten iron are used as the charge. In terms of mass percentage, scrap steel accounts for 35% to 40%, and molten iron accounts for 60% to 65%; oxygen blows for 65 minutes to 70 minutes, and electrodes are powered for 10 minutes to 15 minutes. , violent boiling, automatic slag flow, decarburization weight 0.60% ~ 0.65%, C is 0.05 ~ 0.25% when tapping, P≤0.010%, tapping temperature 1660 ~ 1680 ℃, tapping 1 / 4 ~ ...

Embodiment 2

[0028] Narrow composition control for chemical composition

[0029]

[0030] Evaluate the carbon segregation index formula

[0031] Cut a transverse test piece from any steel, analyze the steel cross section center (code: Cz), 3 / 4 radius (code: Cb), 1 / 2 radius (code: Cc), 1 / 4 radius (code: Cd) The calculated carbon segregation meets the following requirements: 0.95≤3×Cz / (Cb+Cc+Cd)≤1.03.

[0032] 50t electric arc furnace + LF + VD + 235×265 medium billet + 800 continuous rolling process to produce BG80MnCr steel for ball mill steel balls, using continuous casting production, fast production pace, high yield, low cost, and many continuous casting furnaces.

[0033] The chemical composition is controlled by narrow composition to ensure the uniformity of the steel structure, long fatigue life, good wear resistance, and easy for customers to process and use.

[0034] Physical chemical composition%: C: 0.82, Si: 0.24, Mn: 0.74, P: 0.009, S: 0.004, Cr: 0.54, O: 0.0009, H: 0.0001...

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Abstract

The invention belongs to the technical field of ball-milling steel ball manufacturing, and relates to steel BG80MnCr for steel balls of a ball mill and a preparation method of the steel. An electric furnace continuous casting production process is adopted; the technological process comprises the following steps of blast furnace molten iron preparation, molten iron pretreatment, 50 t electric arc furnace smelting, refining furnace LF, vacuum degassing VD, casting of 235*265 medium square billets, stepping beam furnace heating, high-pressure water descaling, rolling with an 800 roughing mill, rolling with a continuous rolling unit, slow cooling, finishing, flaw detection, inspection and warehousing. The invention provides a high-density and high-purity ball-milled steel smelting technology,and the purity of the steel is effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of ball mill steel ball manufacturing, and relates to a BG80MnCr ball mill steel ball steel and a preparation method thereof. Background technique [0002] With the rapid development of my country's industry, the demand for mine resource products in various domestic industries continues to increase, the technology for deep processing of ore continues to improve, and the quality requirements for ball milling steel balls used to pulverize ore are getting higher and higher. Compared with the imported ball milled steel, the steel grade design of the ball milled steel in my country is basically the same, but the service life and quality of the forged steel ball products are quite different, which cannot fully meet the production needs. [0003] The steel for producing ball mill steel balls in the prior art has the following defects: (1) electric furnace continuous casting and smelting is fast, and the content of ...

Claims

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Application Information

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IPC IPC(8): C22C33/06C21C7/04C21C7/10B22D11/16C22C38/02C22C38/04C22C38/06C22C38/18
CPCB22D11/16C21C7/0006C21C7/04C21C7/10C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/18Y02P10/20
Inventor 张群赵千水孙忠斌张涛赵建成
Owner BENGANG STEEL PLATES
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