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

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...

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-resistant; some are wear-resistant, but the corrosion resistance is poor

3. Instead of directly obtaining its high performance from the cast state, most of them use heat treatment, which is expensive and has secondary pollution

4. Short service life and frequent replacement

That is to say, it affects the normal use and increases the maintenance cost