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A kind of nodular cast ball and its manufacturing method

A production method and technology of casting balls are applied in the field of wear-resistant casting balls to achieve the effects of avoiding oil quenching pollution and low production costs

Active Publication Date: 2017-01-11
安徽省宁国诚信耐磨材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to improve a kind of nodular cast ball and its manufacturing method, whose hardness, impact toughness, and falling ball fatigue times exceed those of high chromium balls.

Method used

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  • A kind of nodular cast ball and its manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Smelting: single smelting in intermediate frequency electric furnace, pig iron, scrap steel and recarburizer are used as raw materials for batching according to the proportion of special balls produced for mines, and scrap steel with the following chemical composition is selected for scrap steel: C0.3~1.0% , Si ≤ 0.4%, Mn ≤ 0.3%, Cr ≤ 0.3%, and the balance is iron; the pig iron has the following chemical compositions: C ≥ 4.0%, Si ≤ 2.0%, S ≤ 0.1%, P ≤ 0.1 %, the balance is iron; after starting the electric furnace, first add scrap steel and recarburizer into the electric furnace, then add pig iron, the melting temperature is 1530 ° C, so that the percentage content of the chemical components of molten iron meets: C3.8% ~ 4.0% , Si0.9%~1.1%, Mn0.5%~0.8%, Mo0.1%~0.2%, Cu0.1%~0.2%, S≤0.05%, P≤0.05%, Cr≤0.3%;

[0027] (2) Spheroidizing treatment: Place the spheroidizing agent on the bottom of the ladle by using the flushing method. The spheroidizing agent is 75 barium ...

Embodiment 2

[0033] (1) Smelting: single smelting in intermediate frequency electric furnace, pig iron, scrap steel and recarburizer are used as raw materials for batching according to the proportion of special balls produced for mines, and scrap steel with the following chemical composition is selected for scrap steel: C0.3~1.0% , Si ≤ 0.4%, Mn ≤ 0.3%, Cr ≤ 0.3%, and the balance is iron; the pig iron has the following chemical compositions: C ≥ 4.0%, Si ≤ 2.0%, S ≤ 0.1%, P ≤ 0.1 %, the balance is iron; after starting the electric furnace, first add scrap steel and recarburizer into the electric furnace, then add pig iron, the melting temperature is 1550°C, so that the chemical composition percentage of molten iron meets: C3.8% ~ 4.0% , Si0.9%~1.1%, Mn0.5%~0.8%, Mo0.1%~0.2%, Cu0.1%~0.2%, S≤0.05%, P≤0.05%, Cr≤0.3%;

[0034] (2) Spheroidizing treatment: Place the spheroidizing agent on the bottom of the ladle by using the flushing method. The spheroidizing agent is 75 barium ferrosilicon wit...

Embodiment 3

[0040] (1) Smelting: single smelting in intermediate frequency electric furnace, pig iron, scrap steel and recarburizer are used as raw materials for batching according to the proportion of special balls produced for mines, and scrap steel with the following chemical composition is selected for scrap steel: C0.3~1.0% , Si ≤ 0.4%, Mn ≤ 0.3%, Cr ≤ 0.3%, and the balance is iron; the pig iron is selected from pig iron with the following chemical compositions: C ≥ 4.0%, Si ≤ 2.0%, S ≤ 0.1%, P ≤ 0.1 %, the balance is iron; after starting the electric furnace, first add scrap steel and recarburizer into the electric furnace, and then add pig iron. The melting temperature is 1580°C, so that the chemical composition percentage of molten iron satisfies: C3.8%~4.0% , Si0.9%~1.1%, Mn0.5%~0.8%, Mo0.1%~0.2%, Cu0.1%~0.2%, S≤0.05%, P≤0.05%, Cr≤0.3%;

[0041] (2) Spheroidizing treatment: Put the spheroidizing agent on the bottom of the ladle by using the flushing method. The spheroidizing agen...

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Abstract

The invention relates to the technical field of wear-resistant cast balls, and discloses a nodular cast ball and a manufacturing method thereof. The nodular cast ball comprises the following chemical components in percentage by weight: 3.6-3.9% of C, 2.4-4.0% of Si, 0.5-0.8% of Mn, 0.1-0.2% of Mo, 0.1-0.2% of Cu, at most 0.05% of S, at most 0.05% of P, at most 0.3% of Cr and the balance of iron. The heat treatment quenching medium adopts a high-polymer quenching liquid, thereby avoiding oil quenching pollution and implementing energy saving and environment protection. The inoculation is completed by three times, so that the nodulizing effect reaches Grade 2-3, the product HRC reaches 60 above, the hardness impact toughness of the high-chromium ball reaches 12 J / cm<2> above, the number of times of falling after tempering reaches more than 30000, and the hardness of the ball after long-time impact and collision reaches 65 above; and the production cost is lower.

Description

technical field [0001] The invention relates to the technical field of wear-resistant cast balls, in particular to a nodular cast ball and a manufacturing method thereof. Background technique [0002] Ductile cast balls show superior performance in wet grinding conditions. The matrix is ​​quenched to obtain a matrix mainly composed of austenite and bainite. This matrix has strong toughness and has the function of work hardening at the same time. There is no need to add a large amount of alloying elements, and the cost is only 60% of that of high chromium cast balls. However, due to the fact that there are still some difficulties in the process control of ductile cast balls in the mass production process, the main reason is that the cleaning time of the spheroidized molten iron is very short. The technical requirements for the cooling medium used for quenching are extremely high, which is also the reason why nodular cast balls have not been widely used after they were develo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08C21D1/18C21D5/00B22D1/00
Inventor 覃照成陈益宁
Owner 安徽省宁国诚信耐磨材料有限公司
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