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Method for casting anti-hydrogen sulfide medium special steel small-caliber valve

A technology of anti-hydrogen sulfide and special steel, which is applied in the direction of casting molding equipment, molds, mold components, etc., to achieve the effects of fast refining speed, cost-free pollution, and improved purity

Inactive Publication Date: 2014-12-03
WENZHOU RUIER METAL MFG CO LTD
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Problems solved by technology

[0004]In order to overcome the shortcomings and deficiencies of the background technology, the present invention provides a casting method and processing method of special steel small-diameter valves resistant to hydrogen sulfide medium, which solves the problem of existing valves Castings have inherent quality and apparent quality problems during the casting process

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Embodiment Construction

[0016] Further description will be given below for the embodiments of the present invention:

[0017] A method for casting small-diameter valves of special steel resistant to hydrogen sulfide medium, using an intermediate frequency furnace to smelt molten steel: select steel ingots smelted in a refining furnace as the main material, and then use pure metal alloy materials as ingredients, the pure metal alloy materials include Si, Mn , Cr, Mo, the refining process is as follows:

[0018] (1) The first refining process: When the temperature of molten steel reaches above 1500℃, refining begins. The refining agent for molten steel refining is a compound refining agent whose main component is CaO 2 and Al 2 o 3 At high temperature, it can react with Si, Mn, Cr carbides in molten steel to remove some slag inclusions in molten steel, and can also form a reduction reaction with oxygen and hydrogen in molten steel to remove part of oxygen and hydrogen in molten steel, and refine The...

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Abstract

The invention relates to a method for casting an anti-hydrogen sulfide medium special steel small-caliber valve, and the method is mainly used for solving the problems of internal quality and surface quality of an existing valve cast in the casting process. According to the casting method, a conventional method for melting molten steel by an intermediate frequency furnace, a twice front refining method and a final ladle refining method, and has the advantages of high refining speed, short time, low cost and no pollution. According to the method, a steel ingot refined by selecting a refining furnace is used as a main material, and a pure metal alloy material is used as an auxiliary material, so that the purity of molten steel can be directly improved, the content of non-metal slag inclusion and gases can be reduced, foreign matters are prevented from entering the molten steel; a composite invest shell casting method is adopted, so that the smoothness of the cast appearance and the size accuracy requirement can be guaranteed.

Description

technical field [0001] The invention relates to a casting waste treatment device, in particular to a method for casting small-diameter valves of special steel resistant to hydrogen sulfide medium. Background technique [0002] Our company produces anti-hydrogen sulfide medium special steel valves for the exploitation of petroleum and natural gas. The valves require very low sulfur and phosphorus content and strict requirements on the performance and chemical composition of valve castings. , gas content and segregation requirements meet ASTM E45-1997 standard level 2.5, the apparent quality of castings is in accordance with MSS SP-55 standard level B requirements, and all components of each valve must be radiographically inspected. [0003] For the existing small-diameter valves below 6 inches, due to the relatively small diameter and light weight of the valves, the molten steel cannot be refined in large-scale refining furnaces. Non-refining production methods have brought ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/04C21C7/06B22C9/04
Inventor 郑福平朱裕敏徐颜林张佳秋
Owner WENZHOU RUIER METAL MFG CO LTD
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