Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for manufacturing super two-phase stainless steel large-sized sea water pump shaft

A duplex stainless steel and manufacturing method technology, applied in metal processing equipment, etc., can solve problems such as poor thermoplasticity, low yield rate of finished products, and difficulty in manufacturing large parts, and achieve the effect of good thermoplasticity and high yield rate of finished products

Active Publication Date: 2009-07-08
上海新闵重型锻造有限公司
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for a long time, a major obstacle to the rapid development and widespread promotion of this steel type is its poor thermoplasticity and low yield of finished products, especially the difficulty in manufacturing large parts
There are still two major difficulties in the production of super duplex stainless steel large seawater pump shafts, one is the smelting operation, composition control and structure guarantee of duplex stainless steel; the other is the forging of large stepped shafts

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for manufacturing super two-phase stainless steel large-sized sea water pump shaft
  • Method for manufacturing super two-phase stainless steel large-sized sea water pump shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through the embodiments, so as to facilitate the understanding of those skilled in the art:

[0012] Such as figure 1 The smelting process of 00Cr25Ni7Mo3WCuN duplex stainless steel: melting the charge in an electric arc furnace (C: 0.8-1.5%, Cr: 24%, Ni: 7%, T: 1580°C) → rough decarburization (C: 0.3-0.5%, Cr: 20~22.5%, Ni: 6.5~7.0%, T: 1650~1750℃) → reduction deoxidation (C: 0.3~0.5%, Cr: 23~24%, Ni: 6.5~7.0%, T: 1680~ 1700°C) → tapping → ladle deslagging → vacuum oxygen blowing (C: ≤0.02%, Cr: 22.5-23.5%, Ni: 6.5-7.0%, T: 1700-1750°C) → coolant, alloy material input ( C: ≤0.02%, Cr: 23.5~25%, Ni: 7.5%, T: 1660~1680℃→vacuum degassing (C: ≤0.02%, Cr: 24.5~25%, Ni: 7.5%, T: 1600 ~1650°C)→Pouring into 28″plum blossom ingot.

[0013] Such as figure 2 For this steel type, the σ phase can be gradually dissolved in austenite or transfo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to smelting, press working and manufacturing and the like, is specially adapted to a method of manufacturing super diphasic stainless steel large-scale sea water pump shafts (multi-stepped shafts) having a performance of corrosion resistant of medium such as sea water, halogen and the like. The method comprises steps of tapping, refining operation, pouring into steel ingots, smithing, solution treating, and diphasic stainless steel water pump shaft obtaining in sequence, wherein, the refining operation comprises steps of vacuum oxygen blast and vacuum degasification in sequence; in the solution treating process, when the water pump shaft is heated to a temperature of 1000-1200 DEG C, the temperature is then reduced rapidly and after the solution treating process, the content of ferrite in the diphasic stainless steel water pump shaft is 45%-52%, and after the vacuum oxygen blast process, the temperature of molten steel is improved to 1700-1750 DEG C. The method has advantages that diphasic stainless steel large-scale sea water pump shafts produced by using the method have a good thermoplasticity, a high product yield, a performance of corrosion resistant of medium such as sea water, halogen and the like, and can satisfy the requirement of large-scale element manufacture.

Description

technical field [0001] The invention relates to smelting and pressure processing and manufacturing, and is particularly suitable for a manufacturing method of a super duplex stainless steel large-scale seawater pump shaft (step shaft) resistant to corrosion by seawater, halogen and other media. Background technique [0002] 00Cr25Ni7Mo3WCuN dual-phase steel was first developed by British Mather and Platt Ltd, and appeared in the form of castings in the mid-1980s. Phase stainless steel. [0003] For urea and other working conditions in my country, similar NTKR-4 steel has been developed in the 1980s, and the molybdenum content has been increased to produce 00Cr25Ni7Mo3N duplex stainless steel, which has been successfully used in seawater heat exchangers and hot brine axial flow pumps in recent years. It has also been proved that the local corrosion resistance of 00Cr25Ni7Mo3WCuN duplex stainless steel is significantly better than that of 316L stainless steel and the first and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C33/04C21C7/10C21C7/072B23P15/00B21J1/06B21J5/00
Inventor 王兴中王元华
Owner 上海新闵重型锻造有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com