Method for micro-alloying treatment of ausferrite ductile cast iron grinding balls

A ductile iron and micro-alloying technology, applied in the mechanical field, can solve the problems of low hardenability, low crushing rate, and reduced bulk hardness, and achieve the effects of improved mechanical properties, high absorption rate, uniform distribution and refinement

Inactive Publication Date: 2015-08-12
LIUZHOU JINDUN MACHINERY
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Problems solved by technology

[0002] CN1035138 discloses "the manufacture method of austempering nodular cast iron grinding ball", the chemical composition of the grinding ball is: 3.3-3.7% C, 2.2-2.6% Si, 0.4-0.7% Mn, P<0.09%, adopting austempering Although the grinding ball has good toughness, roundness and low breakage rate (<0.06%), the hardenability of the grinding ball is low for the grinding ball with a diameter greater than 100mm, and there are three organizational regions in the grinding ball section: The surface is bainite + austenite, the transition layer is troostite + bainite, and the center is troostite, which leads to uneven distribution of hardness of the ball and a decrease in volume hardness

Method used

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Embodiment Construction

[0006] A microalloying treatment method for ausferitic nodular cast iron grinding balls. The mass percentages of chemical elements of ausferitic nodular cast iron grinding balls are: 3.3-3.7%C, 2.0-3.0%Si, 1.0-2.5%Mn, 0.7- 3.0%Cr, 0.1~1.0%Mo, 0.1~1.0%Cu, 0.04~0.08%P, 0.01~0.020%S, 0.03~0.05%Mg, 0.02~0.04%Ce, 0.03~0.07%B, 0.06~0.12% Ti, 0.03-0.2% V and the rest are Fe, and are prepared by the following steps, raw material preparation and smelting: 3.3-3.7%C, 2.0-3.0%Si, 1.0-2.5%Mn, 0.7-3.0% by mass percentage of elements %Cr, 0.1~1.0%Mo, 0.1~1.0%Cu, 0.04~0.08%P, 0.01~0.020%S and the rest are Fe. Raw materials for preparation: pig iron, scrap steel, ferrosilicon, ferromanganese, ferrochromium, ferromolybdenum and Copper, put the prepared raw materials into an intermediate frequency induction furnace, heat up until all the raw materials are melted, and smelt into ausferitic nodular cast iron raw iron liquid, the furnace temperature is 1500-1550 °C; according to the above-mentione...

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Abstract

The invention provides a method for micro-alloying treatment of ausferrite ductile cast iron grinding balls. The ausferrite ductile cast iron grinding balls comprise the following chemical element components in percentage by mass: 0.03-0.07% of B, 0.06-0.12% of Ti and 0.03-0.2% of V, which are respectively converted into the mass percents of BFe, TiFe and VFe alloys, wherein the alloys are weighed and then crushed into 0.5-1.0mm, and are added into a ladle together with a nodulizer and an inoculant; and during iron tapping, the heat and a stirring effect of high-temperature molten iron are utilized to ensure that BFe, TiFe and VFe alloy fine particles are dissolved in the molten iron and are absorbed by the molten iron, thereby finishing the micro-alloying treatment. By adopting the method for micro-alloying treatment of the ausferrite ductile cast iron grinding balls, provided by the invention, the absorptivity of B, Ti and V alloy elements is relatively high, so that graphite pebbles and carbides of the ausferrite ductile cast iron grinding balls are uniformly distributed and are refined, and mechanical properties are improved.

Description

technical field [0001] The invention relates to a microalloying treatment method for ausferrite ductile iron grinding balls, belonging to the technical field of machinery. Background technique [0002] CN1035138 discloses "the manufacture method of austempering nodular cast iron grinding ball", the chemical composition of the grinding ball is: 3.3-3.7% C, 2.2-2.6% Si, 0.4-0.7% Mn, P<0.09%, adopting austempering Although the grinding ball has good toughness, roundness and low breakage rate (<0.06%), the hardenability of the grinding ball is low for the grinding ball with a diameter greater than 100mm, and there are three tissue areas in the grinding ball section: The surface is bainite + austenite, the transition layer is troostite + bainite, and the core is troostite, which leads to uneven hardness distribution of the grinding ball and a decrease in volume hardness. Contents of the invention [0003] The invention provides a microalloying treatment method for ausfer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08C21C1/10
CPCY02P10/20
Inventor 何拥军何嘉圣何嘉贤陈林黄立德赖卫华
Owner LIUZHOU JINDUN MACHINERY
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