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

A kind of fecral stainless steel composite pipe blank and preparation method thereof

A technology of stainless steel and composite pipe, applied in the field of FeCrAl stainless steel composite pipe blank and its preparation, can solve the problems of unsatisfactory and prone to interlayer peeling, and achieve the effects of reducing porosity, uniform microstructure and reasonable particle size composition

Active Publication Date: 2022-03-29
CENT IRON & STEEL RES INST
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the embodiment of the present invention aims to provide a FeCrAl stainless steel composite tube blank and its preparation method to solve the problem that the composite tube prepared by the existing method is prone to delamination during subsequent cold and hot processing and cannot meet the requirements. Subsequent cold and hot processing requirements

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
  • A kind of fecral stainless steel composite pipe blank and preparation method thereof
  • A kind of fecral stainless steel composite pipe blank and preparation method thereof
  • A kind of fecral stainless steel composite pipe blank and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] The preparation principle adopted in the present invention is: the present invention prepares the FeCrAl stainless steel layer 2 by powder metallurgy on a mandrel made of metal such as stainless steel or alloy steel, so that the T91 steel mandrel layer 1 and the FeCrAl stainless steel layer 2 are formed. The metallurgical bonding layer 4 satisfies comprehensive requirements such as mechanical properties and corrosion resistance. Specifically, FeCrAl stainless steel ingots (i.e. FeCrAl stainless steel bar master material) are smelted by vacuum induction process, and high-quality FeCrAl stainless steel powder with low O content (oxygen content is lower than 0.0014wt%) is prepared by plasma rotating electrode atomization. After the powder is sieved To obtain stainless steel powder with small particle size and uniform size, powder metallurgy is carried out on the sheathing device containing T91 steel mandrel and FeCrAl stainless steel powder by hot isostatic pressing to obta...

Embodiment 1

[0052] This embodiment provides a method for preparing a FeCrAl stainless steel composite tube blank, comprising the following steps:

[0053] Step 1. Use a 25kg vacuum induction furnace to smelt steel ingots after iron washing in the forehearth, and use pure iron, Ni plate, J-Cr, and aluminum blocks to smelt Benxi Steel. The chemical composition of the cast FeCrAl stainless steel ingot is shown in Table 1.

[0054] FeCrAl stainless steel ingots are subjected to vacuum degreasing treatment: the vacuum degree is 0.13Pa, the temperature is 320°C, and the temperature is kept for 5h after reaching the temperature. Steel ingots are cooled to 80°C in a vacuum chamber and released.

[0055] Step 2. Prepare FeCrAl stainless steel powder by plasma rotating electrode atomization, the vacuum degree is 0.2Pa, the air leakage rate is 0.8Pa / min; the ingot speed is 15000r / min, the plasma arc current is 2000A, and the plasma working gas flow rate is 280L / min ; The FeCrAl stainless steel pow...

Embodiment 2

[0061] This embodiment provides a method for preparing a FeCrAl stainless steel composite tube blank, comprising the following steps:

[0062] Step 1. Use a 25kg vacuum induction furnace to smelt steel ingots after iron washing in the forehearth, and use pure iron, Ni plate, J-Cr, and aluminum blocks to smelt Benxi Steel. The chemical composition of the cast FeCrAl stainless steel ingot is shown in Table 1.

[0063] The FeCrAl stainless steel ingot is subjected to vacuum degreasing treatment: the vacuum degree is 0.13Pa, the temperature is 500°C, and after reaching the temperature, it is kept for 0.5h, and the steel ingot is cooled to 100°C in the vacuum chamber and released from the furnace.

[0064] Step 2. Prepare FeCrAl stainless steel powder by plasma rotating electrode atomization method, the vacuum degree is 0.13Pa, the air leakage rate is 1.0Pa / min; the ingot speed is 11000r / min, the plasma arc current is 1300A, and the plasma working gas flow rate is 35L / min ; FeCrAl...

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 a FeCrAl stainless steel composite tube blank and a preparation method thereof, belonging to the technical field of stainless steel composite tube blanks, and solves the problem that interlayer peeling easily occurs in the subsequent cold and hot processing of the composite tube prepared by the existing method. The FeCrAl stainless steel composite tube blank provided by the present invention includes a mandrel layer, a metallurgical bonding layer and a FeCrAl stainless steel layer; its preparation method includes: step 1, smelting FeCrAl stainless steel ingot; step 2, preparing FeCrAl stainless steel powder; step 3, using low carbon steel Manufacture the sheath, and carry out welding and airtightness leak detection after assembling with mandrel; Step 4, pack FeCrAl stainless steel powder into the sheath after sieving and seal welding; Step 5, seal and weld the package containing FeCrAl stainless steel powder The sleeve is pressed and formed in a hot isostatic pressing machine. After the hot isostatic pressing is completed, the sleeve is removed to obtain a high-quality composite tube blank. The FeCrAl stainless steel composite tube blank prepared by the invention is not prone to delamination during subsequent cold and hot processing, and finally meets the requirements of subsequent cold and hot processing.

Description

technical field [0001] The invention relates to the technical field of stainless steel composite tube blanks, in particular to a FeCrAl stainless steel composite tube blank and a preparation method thereof. Background technique [0002] In the fields of energy, chemical industry and marine engineering, stainless steel pipes are required for fluid transmission, which requires pipes to have both high strength and corrosion resistance under specific corrosive media. A single material cannot meet the comprehensive service performance requirements under certain conditions, and composite pipes are required. . One material of composite pipe provides strength, and the other lining or jacket material provides corrosion resistance. [0003] At present, the common tube blank or pipe composite forms include mechanical rolling, drawing composite, explosive composite, hydraulic composite, surface coating, etc. However, there is no metallurgical bonding between the composite pipe layers ...

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 Patents(China)
IPC IPC(8): B22F9/14B22F3/15B22F7/04B22F5/12C22C38/18C22C38/06C22C38/04C22C38/02
CPCB22F9/14B22F3/15B22F7/04B22F5/106C22C38/18C22C38/06C22C38/04C22C38/02C22C38/005C22C38/002C22C38/001B22F2007/042
Inventor 丰涵贾健宋志刚郑文杰朱玉亮何建国
Owner CENT IRON & STEEL RES INST
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