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Method for manufacturing propeller casting for high nitrogen austenite stainless steel vessel

A technology of nitrogen austenite and stainless steel, which is applied in the field of manufacturing high nitrogen austenitic stainless steel propeller castings for ships, can solve problems such as unreasonable distribution characteristics, casting hole defects, etc., and achieve lower requirements for process conditions, good economic benefits, and Effect of Avoiding Hole Defects

Inactive Publication Date: 2016-05-11
CHANGCHUN SHIYUE ENERGY SAVING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, high-nitrogen austenitic stainless steel releases nitrogen when it is smelted and cast under ordinary ambient atmospheric pressure. Nitrogen accumulates to form nitrogen holes, which remain in the casting, which easily causes casting hole defects and unreasonable distribution characteristics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Casting small marine high-nitrogen austenitic stainless steel integral propeller castings (integral structure diameter 1050mm), the operation steps are as follows:

[0023] 1. Design casting and gating system

[0024] Casting component control requirements: 0.6-0.7% N, <0.03% C, 18-20% Cr, 16-18% Mn, <0.03% P, <0.03% S, <0.5% Si, the balance Fe.

[0025] 2. Making models and preparing for production

[0026] 2.1 The composition, particle composition and physical and chemical properties of pure iron, manganese metal, ferrochrome nitride ferroalloys, master alloys, or formula metallurgical materials used in smelting meet the established production standards. Raw materials and formula materials such as slagging agent, silicon-calcium deoxidizer, and covering agent during smelting meet the production standards. Furnace body, tundish, pouring ladle and other furnace building or repair materials such as magnesia brick, magnesia, refractory cement, water glass and proportion...

Embodiment 2

[0056] Cast high nitrogen austenitic stainless steel variable pitch propeller blade castings (total length 1680mm), the specific operation steps are as follows:

[0057] 1. Casting and gating system design

[0058] Casting component control requirements: 0.8-0.9% N, <0.03% C, 20-22% Cr, 18-20% Mn, 2.5-3.5% Mo, <0.03% P, <0.03% S, <0.5% Si, and more The amount of Fe.

[0059] 2. Model making and production preparation

[0060] 2.1 The composition, particle composition and physical and chemical properties of pure iron, manganese metal, ferrochrome nitride ferroalloys, master alloys, or formula metallurgical materials used in smelting meet the established production standards. Raw materials and formula materials such as slagging agent, silicon-calcium deoxidizer, and covering agent during smelting meet the production standards. Furnace body, tundish, pouring ladle and other furnace building or repair materials such as magnesia brick, magnesia, refractory cement, water glass an...

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PUM

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Abstract

The invention relates to a method for manufacturing a propeller casting for a high nitrogen austenite stainless steel vessel. The method comprises the following seven steps: design of a propeller or paddle casting and a pouring system for the propeller or paddle casting; modeling and production preparation; wax molding; shell molding; smelting and pouring; post-treatment; and inspection. In the shell molding process, after a model shell is put into a case for sufficient roasting, the temperature of the model shell is controlled to be 650-1000 DEG C for pouring preparation. The smelting and pouring process comprises the following steps: carrying out smelting under the condition of ordinary pressure; regulating the heating power; after melting as well as deslagging and smelting are performed, quickly adjusting to reach pouring temperature and controlling the pouring temperature to be 1480-1590 DEG C; starting pouring within 90 s and finishing the pouring of all molten steel within 5 min; and after the pouring is finished, delaying solidification and sealing at a pouring gate by adopting the hot gating technology. By adoption of the method, no bubble is generated during pressure sealing and remains in the manufactured casting, and the difficult problem about unqualified high nitrogen austenite stainless steel propeller castings is solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel casting, and in particular relates to a method for manufacturing high-nitrogen austenitic stainless steel propeller castings for ships under normal atmospheric pressure. Background technique [0002] With the continuous development of China's transportation industry, propellers, as the propellers of aircraft and ships, have attracted the attention of various countries. The working conditions of propellers have high requirements for their own materials. The research and development of performance materials never stops. [0003] At present, high manganese aluminum bronze C95700 (75Cu-3Fe-8Al-2Ni-12Mn) meets the requirements of large tonnage and high-speed ships, and its performance is better. Stainless steel 316L or 316N is also suitable for manufacturing marine propellers. However, propellers made of these materials still have the disadvantages of limited seawater corrosion resistance or l...

Claims

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Application Information

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IPC IPC(8): B22D13/00B22C9/04B22D27/04C21D6/00C21D9/00C22C38/38C22C38/22
CPCB22C9/04B22D13/00B22D27/04C21D6/002C21D9/0068C21D2211/001C22C38/001C22C38/22C22C38/38
Inventor 王柏树季长涛霍晶晶姚军陈咨伟黄岩张晓宇崔晓鹏
Owner CHANGCHUN SHIYUE ENERGY SAVING MATERIAL CO LTD
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