Method for quickly smelting low-nitrogen stainless steel through vacuum induction furnace

A low-nitrogen stainless steel, vacuum induction furnace technology, applied in the field of iron and steel metallurgy, can solve the problems of unstable nitrogen yield, high production cost, slow production rhythm, etc., to achieve stable and controllable reaction process, short and accurate smelting cycle The effect of smelting

Active Publication Date: 2016-09-28
HEBEI IRON AND STEEL
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when argon is filled in the vacuum induction furnace and nitrogen alloy is added, the yield of nitrogen in the steel is unstable, and the amount of nitrogen increase is not easy to control; in order to avoid a large number of concentrated bubbles, the nitride alloy can only be added in batches, which seriously slows down the process. Production rhythm; the smoke and dust brought up when adding nitrided alloys is not conducive to the observation of furnace conditions under vacuum; using nitrided alloys for alloying, the production cost is high

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 quickly smelting low-nitrogen stainless steel through vacuum induction furnace
  • Method for quickly smelting low-nitrogen stainless steel through vacuum induction furnace
  • Method for quickly smelting low-nitrogen stainless steel through vacuum induction furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: 316L nitrogen-containing stainless steel was smelted in a 50kg vacuum induction furnace.

[0029] (1) Add 21.77kg of pure iron, 1.57kg of ferromolybdenum, 4.31kg of nickel plate, and 6.71kg of metal chromium into the crucible of the vacuum induction furnace.

[0030] (2) First evacuate to 4Pa, and then heat it with electricity until the charge is melted.

[0031] (3) Measure the temperature after melting, and carry out refining for 3 minutes under the condition of vacuum degree <1Pa.

[0032] (4) Fill the furnace with nitrogen to 50000Pa.

[0033] (5) Add 0.63kg of metal manganese and 0.01kg of carbon powder for alloying and sampling, and pour when the nitrogen atmosphere is maintained for 8 minutes. See Table 1 for product composition requirements and finished product composition.

[0034] Table 1 316L stainless steel composition requirements and smelted finished product composition (wt%)

[0035]

Embodiment 2

[0036] Example 2: A 500kg vacuum induction furnace was used to smelt 0Cr16Ni5Mo nitrogen-containing stainless steel.

[0037] (1) Add 386.4kg of pure iron, 2.2kg of ferromolybdenum, 27.58kg of nickel plate, and 80.73kg of metal chromium into the crucible of the vacuum induction furnace.

[0038] (2) First evacuate to 5Pa, and then heat it with electricity until the charge is melted.

[0039] (3) Measure the temperature after melting, and refine for 2.5 minutes under the condition of vacuum degree <1Pa.

[0040] (4) Fill the furnace with nitrogen to 50000Pa.

[0041] (5) Add 3.08kg of metal manganese for alloying and sampling, and pour when the nitrogen atmosphere is maintained for 9.5 minutes. See Table 2 for product composition requirements and finished product composition.

[0042] Table 2 0Cr16Ni5Mo stainless steel composition requirements and smelting finished composition (wt%)

[0043]

Embodiment 3

[0044] Example 3: Smelting X12CrMoWVNbN nitrogen-containing steel in a 50kg vacuum induction furnace.

[0045] (1) Add 38.2kg of pure iron, 0.78kg of ferromolybdenum, 0.324kg of nickel plate, 4.5kg of metal chromium, and 0.565kg of ferrotungsten into the crucible of the vacuum induction furnace.

[0046] (2) First evacuate to 5Pa, and then heat it with electricity until the charge is melted.

[0047] (3) Measure the temperature after melting, and carry out refining for 2 minutes under the condition of vacuum degree <1Pa.

[0048] (4) Fill the furnace with nitrogen to 40000Pa.

[0049] (5) Add 0.21kg of electrolytic manganese, 0.03kg of ferroniobium, and 0.17kg of ferrovanadium for alloying and sampling, and pour when the nitrogen atmosphere is kept for 5min20s. See Table 3 for product composition requirements and finished product composition.

[0050] Table 3 X12CrMoWVNbN nitrogen-containing steel composition requirements and smelted product composition (wt%)

[0051]

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 discloses a method for quickly smelting low-nitrogen stainless steel through a vacuum induction furnace, and belongs to the technical field of steel and iron metallurgy. The method comprises the steps of (1) adding steel and iron materials and an alloy material not liable to oxidize into a vacuum induction furnace crucible; (2) firstly, carrying out vacuum pumping, and then, performing energization for heating till the steel and iron materials are melted; (3) after melting, measuring the temperature, and carrying out refining with the vacuum degree and temperature maintained; (4) calculating the required nitrogen pressure, then, filling the furnace with nitrogen with the required pressure, and carrying out nitrogen increase alloying; and (5) carrying out alloying of other alloy materials under the nitrogen atmosphere, and carrying out pouring in the planned steel pouring time. According to the method, nitrogen alloying is carried out through utilizing nitrogen, the alloying of other elements is carried out under the nitrogen atmosphere protection, the reaction process is steady and controllable, the melting cycle is short, and the purpose that the low-nitrogen stainless steel is quickly and accurately smelted is achieved.

Description

technical field [0001] The invention relates to a method for rapidly smelting low-nitrogen stainless steel in a vacuum induction furnace, belonging to the field of iron and steel metallurgy. Background technique [0002] Nitrogen is a strong austenite forming element, 27 times stronger than nickel, and is often used to replace expensive nickel in stainless steel, and nitrogen can also produce dispersion hardening by precipitation of nitrides in complex austenitic steels , Improve the mechanical properties and corrosion resistance of steel. Therefore, nitrogen can be added to increase hot strength without significantly affecting brittleness. [0003] At present, nitrogen-containing stainless steel is smelted in a vacuum induction furnace, and nitrogen-increasing alloying is mainly carried out by filling nitrogen alloys under an argon atmosphere. However, when argon is filled in the vacuum induction furnace and nitrogen alloy is added, the yield of nitrogen in the steel is u...

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): C22C33/04C22C38/44C22C38/58
CPCC22C33/04C22C38/001C22C38/44C22C38/58
Inventor 高宇翟永臻李博斌张福利董廷亮
Owner HEBEI IRON AND STEEL
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