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Production method for reducing cracks of investment casting CK3MCuN superaustenitic stainless steel

A technology of austenitic stainless steel and investment casting, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., which can solve the problems of poor control of casting structure and weight, failure to quickly pass through the brittle phase temperature zone, and damage To solve problems such as operators and employees, to achieve the effect of increasing penetration pass rate and weldability, no safety hazards, and avoiding delays in delivery

Pending Publication Date: 2022-05-06
泰钢合金(中山)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: 1) It is necessary to set up a special soaking pool near the pouring workshop, occupying the production site; 2) When the casting enters the water at high temperature, the splash generated by the violent reaction may hurt the operator; 3) After the casting is soaked in water, the shrinkage in the riser Moisture is not easy to dry, and there is a risk of furnace explosion when returning to the furnace for smelting again; 4) Due to the structure and weight of castings, it is difficult to control the timing of water entry. If the casting is not completely solidified and water enters too early, it will not only affect the feeding of the casting, but may also cause a safety accident of explosion ; If the casting enters the water too late, it will not achieve the purpose of quickly passing through the brittle phase temperature zone

Method used

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  • Production method for reducing cracks of investment casting CK3MCuN superaustenitic stainless steel
  • Production method for reducing cracks of investment casting CK3MCuN superaustenitic stainless steel
  • Production method for reducing cracks of investment casting CK3MCuN superaustenitic stainless steel

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] A customer's butterfly valve casting with product number BQF121, with a unit weight of 3.63kg, requires penetration testing of defects ≤ level 3 according to ASME B 16.34 standards. The original production method: CK3MCuN raw material plus 30% recycled material, top injection pouring system without filter, smelting in atmospheric intermediate frequency furnace. After the penetration test of the casting, there are many 5-10mm long cracks on the surface, especially the cracks at the junction of the flange and the shaft; in addition to crack defects, the casting surface also has slag inclusions and air hole defects, the penetration is unqualified, and the overall quality of the casting is poor. Castings are very sensitive to cracks during welding and repairing. If the grinding temperature is too high, cracks will occur, and the welding line energy w...

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Abstract

The invention relates to a production method for reducing cracks of investment casting CK3MCuN super austenitic stainless steel, which belongs to the field of investment casting, has the technical core of reducing crack defects by improving the purity of molten steel, and is characterized in that a pouring system is assembled and welded with a filter sheet, CK3MCuN congruent component profile leftover materials are adopted as raw materials, a new furnace lining is adopted, argon is introduced into the furnace bottom, and the CK3MCuN congruent component profile leftover materials are subjected to continuous casting; and performing furnace surface argon protection smelting. The method is high in applicability and free of potential safety hazards, casting crack defects can be reduced, the nondestructive testing penetration qualification rate and weldability of the castings are improved, the production cost is reduced, and obvious economic benefits can be brought to enterprises.

Description

technical field [0001] The invention belongs to the field of investment casting, in particular to a production method for reducing cracks in investment casting CK3MCuN super austenitic stainless steel. Background technique [0002] Super austenitic stainless steel is a special steel grade developed mainly to solve the problems of pitting corrosion resistance and crevice corrosion resistance of the original Cr-Ni austenitic stainless steel under severe corrosion conditions. This steel grade can be compared with some well-known Comparable to nickel-based corrosion-resistant alloys. When the pitting resistance equivalent of austenitic stainless steel PREN=Cr%+3.3×Mo%+16×N%)≥40, it can be called super austenitic stainless steel. CK3MCuN is a corrosion-resistant material in the ASTM A743 standard. It belongs to super austenitic stainless steel and is mainly used in industries with harsh working conditions, such as petroleum, natural gas, chemical industry, papermaking, offshore ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/08
CPCB22C9/04B22C9/082
Inventor 林再生孙延明王海林项黄飞单水根
Owner 泰钢合金(中山)有限公司
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