Water atomizing steel powder used for high-compressibility sintering hardening and production method thereof

A sintering hardening, high compressibility technology, applied in the field of high-performance powder metallurgy alloy powder manufacturing, can solve the problems of powder compressibility, loss of oxide strengthening effect and sintering hardening effect, increase powder cost, etc., to reduce material cost , the effect of saving energy consumption and low product price

Inactive Publication Date: 2010-03-03
JIAXIN METAL POWDER
View PDF0 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking ATOMET4701 (Fe-0.45Mn-0.45Cr-1Mo-0.9Ni pre-alloyed steel powder, adding 2% Cu and 0.75% C) from Canada Quebec Metal Powder Company as an example, the composition of the sinter-hardening powder includes Alloying elements Ni, Mo, Mn, Cr, carbon and Cu with strong hardenability are used, and as the price of raw materials generally rises, in order to reduce the cost of raw materials for powder metallurgy parts, Mn and Cr with lower cost become sintered Hardening powder is an ideal alloying element, but these alloying elements have a strong affinity with oxygen, and they are easy to form oxides during sintering, losing the strengthening effect and sintering hardening effect, so they have to use water atomization to completely pre-alloy steel powder, and pre-alloyed powder The hardness of the powder will affect the compressibility of the powder. Therefore, it is necessary to anneal the water atomized alloy steel powder containing Cr and Mn under high vacuum to reduce its microhardness. This process increases the cost of the powder to a certain extent.

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
  • Water atomizing steel powder used for high-compressibility sintering hardening and production method thereof
  • Water atomizing steel powder used for high-compressibility sintering hardening and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Choose 960kg compressibility as 7.12g / cm 3 (under the condition of 600MPa), add 20kgNi-50Mn gas-atomized alloy powder and 20kg-300mesh electrolytic copper powder to the water-atomized pure iron powder, place it in a 1000L batch machine and mix for 1 hour, take it out and input it into the steel belt reduction Diffusion is carried out in the annealing furnace, and the diffusion temperature is set at 820°C. After diffusion, the -100 mesh sintered hardened alloy powder is obtained by crushing, sieving and classification, and the measured powder compressibility is 7.14g / cm 3 (under the condition of 600MPa); select 25kg of the powder, add 0.175kg-500 mesh graphite powder and 0.175kg zinc stearate powder (lubricant), mix in V-type mixer for 1 hour, and press (600MPa) to form The standard sample was sintered in a sintering furnace at a temperature of 1120°C for 1 hour, and several test pieces were obtained. The test results are as follows:

[0013] Numbering

Embodiment 2

[0015] Select 964kg with a compressibility of 7.12g / cm 3 (under the condition of 600MPa), add 18kgNi-50Mn alloy powder and 18kg-300mesh electrolytic copper powder, put it in a 1000L batch machine and mix for 1 hour, take it out and put it into the steel belt reduction annealing furnace Diffusion is carried out, and the diffusion temperature is set at 820°C. After diffusion, it is crushed, sieved and classified to obtain -100 mesh sintered hardened alloy powder. The measured powder compressibility is 7.14g / cm 3 (under the condition of 600MPa); select 25kg of the powder, add 0.175kg-500 mesh graphite powder and 0.175kg zinc stearate powder (lubricant), mix in V-type mixer for 1 hour, and press (600MPa) to form The standard sample was sintered in a sintering furnace at a temperature of 1120°C for 1 hour, and several test pieces were obtained. The test results are as follows:

[0016] Numbering

Embodiment 3

[0018] Select 956kg with a compressibility of 7.12g / cm 3 (under the condition of 600MPa), add 22kgNi-50Mn alloy powder and 22kg-300mesh electrolytic copper powder, put it in a 1000L batch machine and mix for 1 hour, take it out and put it into the steel belt reduction annealing furnace Diffusion is carried out, and the diffusion temperature is set at 820°C. After diffusion, it is crushed, sieved and classified to obtain -100 mesh sintered hardened alloy powder. The measured powder compressibility is 7.14g / cm 3 (under the condition of 600MPa); select 25kg of the powder, add 0.175kg-500 mesh graphite powder and 0.175kg zinc stearate powder (lubricant), mix in V-type mixer for 1 hour, and press (600MPa) to form The standard sample was sintered in a sintering furnace at a temperature of 1120°C for 1 hour, and several test pieces were obtained. The test results are as follows:

[0019] Numbering

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 water atomizing steel powder used for high-compressibility sintering hardening and a production method thereof. The water atomizing steel power comprises the following raw material components by weight percent: 1.0% of nickel, 1.0% of manganese, 2.0% of copper and the balance of iron, wherein water atomizing pure iron powder with compressibility more than 7g / cm<3> under the condition of 600Mpa is adopted as basal power, and is dispersed in a reduction annealing furnace together with 300 meshes of copper powder and Ni-50Mn alloy powder atomized by adopting inert gases,thus obtaining the water atomizing steel powder used for high-compressibility sintering hardening; and when powder metallurgy parts are produced, 0.7-0.8% of graphite powder of 500 meshes and 0.7-0.8%of lubricant stearic acid zinc powder are added according to weight percent, mixed for 1 hour in a V-shaped blender mixer, and sintered for 1 hours in a sintering furnace under the temperature of 112DEG C. The invention has the beneficial effects that the sintering hardening powder has high compressibility. Therefore, the strong sintering hardening capability of Mn is utilized effectively, and the reduction of the compressibility of the iron powder is avoided. The material cost is reduced by more than 20%, and simultaneously, the diffusion technology is more energy-saving compared with the vacuum annealing technology.

Description

technical field [0001] The invention belongs to the technical field of alloy powder manufacturing for high-performance powder metallurgy, and specifically relates to a high-compressibility sintering hardening water atomized iron and steel powder and a production method. Background technique [0002] Sinter hardening refers to the phenomenon that the strength and hardness increase during the sintering process of iron-based powder metallurgy parts. The main feature of the sinter hardening process is that on the premise of obtaining high strength and high hardness mechanical properties, the heat treatment process after sintering of iron-based parts is omitted, which reduces the production cost of the parts; at the same time, the cooling rate is much lower than that of the traditional quenching process. Avoid the deformation of parts and improve the precision of iron-based parts. [0003] At present, the Swedish Hegnas Company and the Canadian Quebec Metal Powder Company both p...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C38/16B22F9/08
Inventor 曹顺华柴献明
Owner JIAXIN METAL POWDER
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap