Method for casting super-large centrifugal cold mould by adopting nodular cast iron

A ductile iron and cold mold technology, which is applied in casting molding equipment, molds, mold components, etc., can solve the problems of high price of forged steel cold molds, affecting the delivery time of rolls, and long production cycles, and achieves guaranteed strength, The effect of compact organization and shortened manufacturing period

Inactive Publication Date: 2010-06-23
ANSTEEL HEAVY MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the forged steel cold form is high in strength, the production cycle is long, which affects the delivery date of the roll; the forged steel cold form is expensive, and the market price per ton is at least 20,000 yuan/t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for casting super-large centrifugal cold molds with ball milled cast iron, comprising tooling preparation, molten iron smelting, molten iron inoculation and spheroidizing treatment, slag removal and pouring, and cold unpacking. The specific steps are as follows:

[0023] 1) Preparation of tooling; ① Building the inner cavity core; ② Collapsing the outer skin in sections, and positioning each section of the sand box through the seam; ③ Drying the inner cavity core and the outer skin in a kiln; ④ Closing the box;

[0024] 2) molten iron smelting; after the raw materials are ready, carry out molten iron smelting to ensure the overheating temperature and overheating time;

[0025] 3) Inoculation and spheroidization treatment of molten iron: after the molten iron is smelted out of the furnace, an inoculant and a nodulizer are added. The inoculant is FeSiRe21 alloy, and the addition amount is 0.3-0.4% of the weight of the molten iron. The adding method is the method o...

Embodiment 2

[0032] After the inoculation and spheroidizing treatment of the molten iron, the composition of the molten iron is: by weight percentage, C 3.3, Si 2.6, Mn0.25, P<0.1, S<0.01, Mg 0.05, Re 0.03, and the balance is Fe, The sum of the ingredients is 100%.

[0033] An ultra-large centrifugal cold mold cast by ball milled cast iron, its main matrix structure is, by weight percentage: 95% ferrite and 5% pearlite. Other steps and conditions are with embodiment 1.

Embodiment 3

[0035] After the inoculation and spheroidizing treatment of the molten iron, the composition of the molten iron is: by weight percentage, C 3.5, Si 2.7, Mn0.2, P<0.1, S<0.01, Mg 0.05, Re 0.02, and the balance is Fe, The sum of the ingredients is 100%.

[0036] An ultra-large centrifugal cold mold cast by ball milled cast iron, its main matrix structure is, by weight percentage: 75% ferrite and 25% pearlite. Other steps and conditions are with embodiment 1.

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PUM

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Abstract

The invention relates to a method for casting a super-large cold mould of nodular cast iron. The cold mould comprises the following main matrixes in percentage by weight: 75 to 95 percent ferrite and 5 to 25 percent pearlite. The liquid iron after inoculation and spheroidization comprises the following components in percentage by weight: 2.9 to 4.5 percent of C, 2.0 to 3.5 percent of Si, less than 0.6 percent of Mn, less than 0.2 percent of P, less than 0.03 of S, 0.02 to 0.08 percent of Mg, 0.02 to 0.08 percent of Re and the balance of Fe, wherein the total amount of the components is 100 percent. The method realizes the super-large centrifugal cold mould cast from the nodular cast iron, ensures the strength of the cold mould, shortens the manufacturing period, greatly reduces the manufacturing cost and ensures the quality of rollers.

Description

technical field [0001] The invention relates to the technical field of manufacturing a centrifugal roll mold, in particular to a casting method of a super-large nodular cast iron cold mold. Background technique [0002] In the prior art, the cold profile material of the centrifugal roll is divided into four types: gray iron, ductile iron, cast steel and forged steel. For small and medium-sized hot-rolled plates (weight less than 25 tons), gray iron, ductile iron and cast steel are mainly used. For the cold forming of large, medium and thick plate rolls, forged steel is mainly used in China, and some of them are made of cast steel. Nodular cast iron material has not been applied to the super large cold type of more than 30 tons. If the forged steel cold form is high in strength, the production cycle is long, which affects the delivery date of the roll; the forged steel cold form is expensive, and the market price per ton is at least 20,000 yuan / ton, while the cost of produc...

Claims

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Application Information

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IPC IPC(8): C22C37/00C22C37/10C22C33/10B22C9/06B22D1/00C21D5/00
Inventor 王素红李凯杜立朝
Owner ANSTEEL HEAVY MACHINERY CO LTD
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