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Investment casting process for super duplex stainless steel pump housing

A technology of duplex stainless steel and investment casting, which is used in manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of repairing welding zone cracks, technical requirements for argon welding of cracks, and difficult to stabilize metallographic structure.

Active Publication Date: 2019-03-15
无锡市优工精密阀门有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] According to the casting characteristics of CD3MWCuN super duplex stainless steel, if the vacuum induction furnace can be used for production, the melting effect is better, but because the vacuum induction furnace melting operation is complicated and the cost is high, and the enterprise often only has a non-vacuum intermediate frequency induction furnace to melt stainless steel according to the routine The process method, mechanical properties, and metallographic structure are difficult to stabilize
During conventional production, cracks will also appear and the requirements for argon welding technology are high. If the control is not good, new cracks will be generated around the repair welding area
[0009] Therefore, for CD3MWCuN(6A) super duplex stainless steel, how to achieve the goal of producing high-performance pump casing precision castings that meet material technical standards and customer requirements by using the existing non-vacuum intermediate frequency induction furnace site conditions, Breaking through the defect that the existing non-vacuum intermediate frequency induction furnace cannot normally produce super duplex stainless steel precision castings has become a technical problem that needs to be solved urgently

Method used

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  • Investment casting process for super duplex stainless steel pump housing
  • Investment casting process for super duplex stainless steel pump housing
  • Investment casting process for super duplex stainless steel pump housing

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Embodiment 1

[0090] The preparation process of the invention includes wax mold making, pouring system design, tree formation, shell making, dewaxing, mold shell, mold shell cleaning, mold shell roasting, molten steel melting, pouring, shelling, cutting and post-treatment.

[0091] 1. Chemical composition control

[0092] (1) Raw material preparation: C ≤ 0.01% industrial pure iron, Ni-0 or Ni-1 electrolytic nickel plate, electrolytic manganese C ≤ 0.02%, ferrosilicon C ≤ 0.03%, pure molybdenum, ferrochromium nitride C≤0.03%, ultra-low carbon duplex stainless steel 2205 finished packaging material and 6A pouring riser return material, etc., in order to ensure that the final chemical composition of super duplex stainless steel carbon content is in the middle and lower line of standard specifications, all raw materials should be First, use a spectrometer to detect the composition, and control the carbon content to not exceed the default technical requirements.

[0093] (2) Preheating of raw ...

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Abstract

The invention relates to an investment casting process for a super duplex stainless steel pump housing, and belongs to the technical field of investment casting processes. Castings are prepared by rawmaterial preparation, preheating, melting, shell roasting, pouring and heat treatment. By means of the investment casting process for the super duplex stainless steel pump housing, the CD3MWCuN superduplex stainless steel pump housing can be manufactured by an ordinary 200-kg medium frequency induction electric furnace. The mechanical properties of the castings manufactured are excellent, and the test results of grain boundary corrosion and RT flaw detection of a weld seam are qualified, so that the crack defects of high performance pump housing precision castings are overcome.

Description

technical field [0001] The invention relates to an investment casting process for a super duplex stainless steel pump casing, in particular to a non-vacuum intermediate frequency induction furnace melting CD3MWCuN duplex stainless steel casting alloy casting process, which belongs to the technical field of investment casting technology. Background technique [0002] As industrial, urban water supply and drainage, and liquid transportation equipment, chemical pumps are of various types and have a wide range of application fields. [0003] It has been found that austenitic stainless steels often fail in environments with stress corrosion cracking, and studies have found that ferrite can reduce the susceptibility of stainless steel to stress corrosion cracking. In order to solve the intergranular corrosion problem of austenitic stainless steel, duplex stainless steel has been paid attention to and developed. [0004] Duplex stainless steel refers to the type of steel that has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/44C22C38/42B22C9/04
CPCB22C9/04C22C33/04C22C38/001C22C38/42C22C38/44
Inventor 周方杰
Owner 无锡市优工精密阀门有限公司
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