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

Non-magnetic ventilation channel steel material for nuclear power/hydropower station and preparation method thereof

A technology for ventilation channel steel and hydropower stations, which is applied in the field of non-magnetic ventilation channel steel materials for nuclear power/hydropower stations and its preparation. It can solve the problems of reduced motor power generation efficiency, reduced hardness and strength, disturbed magnetic field uniformity, and stability, etc., to achieve The effect of reducing magnetic permeability, stabilizing austenite structure, bright surface and no oxidation

Active Publication Date: 2019-12-31
大连环新新材料科技有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although the traditional 0Cr18Ni9 stainless steel material has better corrosion resistance than Q235 structural steel, it has a high magnetic permeability {μ≥1.5 (H=15924A / m)} while ensuring strength
The level of magnetic permeability has a great influence on the super strong magnetic field generated by the rotor in the generator when it rotates at high speed. When the magnetic permeability μ≥1.10, it will interfere with each other and disturb the uniformity and stability of the original magnetic field. , resulting in a significant reduction in the power generation efficiency of the motor
And if you want the surface magnetic permeability of stainless steel to meet μ≤1.10, you need to carry out solid solution treatment, then the hardness and strength of the material itself will be reduced

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A high-strength 0Cr18Ni9 stainless steel material adopts the following preparation method:

[0053] 1) Ingredients

[0054] Clean scrap steel, Cr metal, Ni metal, scrap copper and lime;

[0055] 2) Electric arc furnace smelting

[0056] After adding the batching materials into the electric arc furnace one by one, turn on the electricity to heat and melt, check the content of C, Si, Mn, P, S, Cr, Ni, Cu and adjust to Cr 18.5%, Mn 3.0%, Ni 8.5%, C 0.04%, Si 1.0%, P 0.035%, S 0.018%, Cu 2.5%, slagging, when the furnace temperature reaches 1650°C, slag removal and tapping;

[0057] 3) AOD refining furnace

[0058] After the molten steel in the primary furnace is put into the furnace, blowing is carried out by blowing N2+O2 mixed gas into the skull;

[0059] 3.1) The main task in the oxidation period is to reduce the C content to less than 0.04%, and remove slag;

[0060] 3.2) Add an appropriate amount of slagging agent, lime and CaF2 to make reducing slag, with an alka...

Embodiment 2

[0079] A high-strength 0Cr18Ni9 stainless steel material adopts the following preparation method:

[0080] 1) Ingredients

[0081] Clean scrap steel, scrap copper, lime, high carbon ferrochrome, high carbon ferronickel are used as raw materials;

[0082] 2) Electric arc furnace smelting

[0083] Add the batching materials to the electric arc furnace in turn, heat and melt them with electricity, measure the content of C, Si, Mn, P, S, Cr, Ni, Cu to Cr 19%, Mn 4.0%, Ni 9%, C 0.04%, Si 1.0%, P 0.030%, S 0.020%, Cu 2%, slagging, when the furnace temperature reaches 1620°C, slag removal and tapping;

[0084] 3) AOD refining furnace

[0085] After the molten steel in the primary furnace is put into the furnace, blowing is carried out by blowing N2+O2 mixed gas into the skull;

[0086] 3.1) Oxidation period: the main task is to reduce C to less than 0.04% and remove slag;

[0087] 3.2) Reduction period: Add appropriate amount of slagging agent, lime + CaF2 or Al powder, etc., to...

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

PropertyMeasurementUnit
diameteraaaaaaaaaa
tensile strengthaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of stainless steel material molding, in particular to a non-magnetic ventilation box iron material for a nuclear power / hydropower station and a preparing method of the non-magnetic ventilation box iron material. Ventilation box iron 0Cr18Ni9 comprises chemical components including 18%-19% of Cr, not larger than 4.0% of Mn, 8%-9% of Ni, not larger than 0.04% of C,not larger than 1.0% of Si, not larger than 0.035% of P, not larger than 0.020% of S, 2%-3% of Cu, 0.18%-0.22% of N and the balance Fe and inevitable impurities. The ventilation box iron 0Cr18Ni9 isobtained through technologies of burdening, electric-arc furnace smelting, AOD furnace refining, electroslag remelting, continuous mill operation, solution treatment, wire winding, acid pickling, drying, drawing, solution treatment, roll forming, cutting, checking, packaging, storage and the like in sequence. The preparation technology is simple, and oxidation machining is not needed. The stainless steel material prepared through the method has the beneficial effect that the austenite structure is stable, the magnetic conductivity is reduced while the strength is guaranteed, the condition thatthe magnetic conductivity mu is smaller than or equal to 1.1(H=15924 A / m), the beneficial effects of high ductility, good resistance to oxidation, good diamagnetism, resistance to intergranular corrosion and the like are achieved, and traditional 0Cr18Ni9 austenitic stainless steel can be replaced.

Description

technical field [0001] The invention belongs to the field of forming stainless steel materials, and in particular relates to a non-magnetic ventilation channel steel material for nuclear power / hydropower stations and a preparation method thereof. Background technique [0002] Ventilation channel steel material is used in the stator core of large and medium-capacity nuclear power / hydropower generators in the radial ventilation system, and is one of the essential components for the ventilation and heat dissipation of the stator core. The traditional 0Cr18Ni9 stainless steel material is due to the addition of high chromium and nickel (containing about 20% chromium and more than 8% Ni) in the steel, the internal structure of the steel presents an austenitic structure state, due to composition segregation or improper heat treatment during smelting , a small amount of martensite or ferrite structure will appear, and the stainless steel material will produce weak magnetism. Theref...

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): C22C38/58C22C38/42C22C38/04C22C38/02C22C33/04C22C33/06C21D8/06C21D8/12B21C37/04
CPCB21C37/047C21D8/065C21D8/1244C21D2211/001C22C33/04C22C33/06C22C38/001C22C38/02C22C38/04C22C38/42C22C38/58
Inventor 李国华迟旭冷俊基
Owner 大连环新新材料科技有限公司
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