Raw material composition for producing high-performance nodular cast iron valve and production method thereof

A technology of raw material composition and nodular cast iron, which is applied in the field of alloy cast iron casting, can solve problems such as affecting normal use, poor corrosion resistance, and increased maintenance costs, and achieve the goals of promoting the formation of pearlite, simple formula and process, and reducing raw material costs Effect

Inactive Publication Date: 2012-02-01
QINGDAO HEDELONG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of the production process of high-performance valves at home and abroad are: 1. The production cost is high, the price of stainless steel is about 80,000 yuan/ton, and the price of alloy steel is about 35,000 yuan/ton
2. The mechanical properties of the produced valves are poor, some are corrosion-resistant, but not wear-

Method used

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Comparison scheme
Effect test

Embodiment 1

[0029] The raw material composition and the production method thereof for the production of high-performance ductile iron valves in this embodiment, the materials are weighed according to the 100% formula of the raw material composition, and the formula is as follows: Q10 pig iron 50-60%, waste parts 15-20% , scrap steel 5-10%, scrap iron 20-25%, ferronickel 0.5-0.8%, scrap copper 0.3-0.6%, scrap tin 0.2-0.3%, nodulizer 1-1.3%, inoculant 1-1.5% .

[0030] According to the specifications of the 0.5-ton intermediate frequency furnace, first weigh 250 kg of Q10 pig iron, about 50 kg of scrap steel, about 100 kg of waste parts, weigh 100 kg of scrap iron, 1 kg of ferronickel, 1.5 kg of scrap copper, and 1 kg of scrap tin. 5.5 kg of -8 rare earth magnesium alloy, 7 kg of 75 silicon grains; first add 95 kg of scrap iron chips to the bottom of the electric furnace, which can effectively prevent the impact on the lining of the electric furnace when pig iron and scrap steel are added, ...

Embodiment 2

[0032] The raw material composition and the production method thereof for the production of high-performance ductile iron valves in this embodiment, the materials are weighed according to the 100% formula of the raw material composition, and the formula is as follows: Q10 pig iron 50-60%, waste parts 15-20% , scrap steel 5-10%, scrap iron 20-25%, ferronickel 0.5-0.8%, scrap copper 0.3-0.6%, scrap tin 0.2-0.3%, nodulizer 1-1.3%, inoculant 1-1.5% .

[0033] According to the specifications of the 0.5-ton intermediate frequency furnace, first weigh 300 kg of Q10 pig iron, about 40 kg of scrap steel, about 80 kg of waste parts, weigh 80 kg of scrap iron, 1 kg of ferronickel, 1.5 kg of scrap copper, and 1 kg of scrap tin. 5 kg of -8 rare earth magnesium alloy, 7 kg of 75 silicon grains; first add 75 kg of scrap iron chips to the bottom of the electric furnace, which can effectively prevent the impact on the lining of the electric furnace when pig iron and scrap steel are added; Car...

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Abstract

The invention discloses a raw material composition for producing a high-performance nodular cast iron valve and a production method thereof. The raw material composition comprises the following components in percentage by weight: 50-60% of Q10 pig iron, 15-20% of waste machine parts, 5-10% of scrap steel, 20-25% of scrap iron, 0.5-0.8% of ferronickel, 0.3-0.6% of scrap copper, 0.2-0.3% of scrap tin, 1-1.3% of nodulizer and 1-1.5% of inoculant. By adopting the composition to produce the high-performance nodular cast iron valve, the formula and process are simple, and the industrial production is easy to achieve; the cast part directly obtained from a cast state form has greatly improved performance, and truly belongs to high-performance nodular cast iron; and by adopting common scrap steel, waste machine parts and scrap iron, the raw material cost of high-performance cast part production can be lowered by times.

Description

technical field [0001] The invention belongs to the technical field of alloy cast iron casting, and in particular relates to a raw material composition for casting high-performance valve castings by appropriately adding nickel, copper and tin elements into ductile iron and a production method thereof. Background technique [0002] High-performance valves have very strict requirements on materials. High-performance valves are generally used in special environments such as chemical industry, shipbuilding, petroleum, and sewage discharge. The valves are required to have special properties such as corrosion resistance, wear resistance, high pressure resistance, and high temperature resistance. [0003] At present, domestic and foreign manufacturers of high-performance valves mostly use stainless steel and alloy steel as raw materials to produce and manufacture valves. The valves produced in this way are expensive, but have general mechanical properties, some are corrosion-resis...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C33/08
Inventor 常云青翟召武代云岗常玉林李云坤
Owner QINGDAO HEDELONG MACHINERY
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