Raw material composition for valve castings special for medium and high pressure oil fields and production method for raw material composition

Abstract

The invention discloses a raw material composition for valve castings special for medium and high pressure oil fields and a production method for the raw material composition. The raw material composition comprises the following components in part by weight: 50 to 40 parts of Q10 pig iron, 50 to 60 parts of low phosphorus steel scrap, 0.5 to 0.8 part of ferromanganese iron, 8 to 10 parts of silicon carbide, 1.8 to 2.2 parts of scrap copper, 0.2 to 0.3 part of scrap tin, 1.5 to 1.7 parts of spheroidizing agent and 1 to 1.5 parts of nucleating agent. The formula and process of the castings are simple, and industrialization is easily realized; the low phosphorus steel scrap is added into the castings, so that the performance of the castings is effectively improved and the production cost of the castings is reduced; and microelements such as scrap copper and scrap tin are added into the castings, so that the generation of the pearlite can be effectively promoted, texture grains are refined, the mechanical properties are improved and a good spheroidization effect is ensured.

Description

Technical field [0001] The invention belongs to the technical field of alloy cast iron casting, and specifically relates to a raw material composition for casting medium and high pressure oilfield special valve castings by appropriately adding silicon carbide, copper and tin elements into ductile cast iron and a production method thereof. Background technique [0002] Valves used in medium and high pressure oil fields require special properties such as fire resistance, anti-static, anti-corrosion, and static pressure resistance due to the special medium the valve is in contact with. At present, most oilfield valve manufacturers at home and abroad use stainless steel, alloy steel and gray cast iron as raw materials to produce and make valves. Stainless steel and alloy steel are used to produce valves, and the material cost is relatively high; gray cast iron is used to produce valves, and the produced valves are resistant Static pressure and anti-corrosion performance can not meet ...

AI Technical Summary

Problems solved by technology

The process reduces the cost of manufacturing, but the performance of the casting is average

[0004] The disadvantages of the production process of special valves for medium and high pressure oilfields at home and abroad are: 1. The valves produced have poor static pressure and corrosion resistance; 2. Instead of directly achieving high performance from the cast state, most of them use heat treatment, which costs high , There is secondary pollution; 3. The service life is short and the replacement is frequent, which not only affects the normal use, but also increases the maintenance cost

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