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A method for smelting duplex stainless steel slabs

A technology of duplex stainless steel and smelting method, which is applied in the smelting field of casting billets, can solve the problems of easy occurrence of porosity, shrinkage cavities and subcutaneous pores, and achieve the effect of reducing loose tissue, dense tissue and high yield.

Active Publication Date: 2020-01-17
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a casting slab of duplex stainless steel and its smelting method, which solves the problem that the casting slab of duplex stainless steel in the prior art is prone to defects such as porosity, shrinkage cavity and subcutaneous pores.

Method used

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  • A method for smelting duplex stainless steel slabs
  • A method for smelting duplex stainless steel slabs
  • A method for smelting duplex stainless steel slabs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The equipment adopts a 50Kg multifunctional induction melting furnace with a limit vacuum of 6.67×10 -2 Pa, the power supply is 160KW, the frequency is 2500Hz, and the furnace load is 36Kg. The smelting target composition of 1# test steel is shown in Table 1.

[0064] Table 1: 1# test steel composition control range and control objectives

[0065] C mn Si Cr Ni Mo N target ingredient 0.02 0.6 0.4 25.5 7.26 4.20 0.35

[0066] Specific steps are as follows:

[0067] (1) Put pure iron, metal chromium, nickel, molybdenum, vanadium, and crucible carbon into the furnace. Ferrochromium nitride, manganese, carbon, silicon, and deoxidizer are loaded into the silo.

[0068] (2) Evacuate the smelting chamber of the multifunctional induction furnace. When the vacuum degree is less than 15Pa, start to send electricity to heat the charge, with a power of 40KW, and gradually increase the power to 70KW at a rate of 5Kw every 5min.

[0069] (3) ...

Embodiment 2

[0086] The equipment adopts a 200Kg multifunctional induction melting furnace with a limit vacuum of 6.67×10 -2 Pa, the power supply is 200KW, the frequency is 2000Hz, and the furnace load is 160Kg. The smelting target composition of 2# test steel is shown in Table 3.

[0087] Table 3: 2# Component Control Range and Control Objectives

[0088] C mn Si Cr Ni Mo N target ingredient 0.02 0.6 0.4 21.0 6.0 3.50 0.20

[0089] Specific steps are as follows:

[0090] (1) Put pure iron, metal chromium, nickel, molybdenum, vanadium, and crucible carbon into the furnace. Ferrochromium nitride, manganese, carbon, silicon, and deoxidizer are loaded into the silo.

[0091] (2) Evacuate the smelting chamber of the multifunctional induction furnace. When the vacuum degree is less than 15Pa, start to send electricity to heat the charge, with a power of 50KW, and gradually increase the power to 150KW at a rate of 10Kw every 5min.

[0092] (3) After the ...

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Abstract

The invention discloses a smelting method for a duplex stainless steel casting blank, and belongs to the technical field of stainless steel smelting. A problem of stainless steel casting blanks in theprior art easily has the defects of loosening, shrinkage and subcutaneous blowholes is solved. The smelting method is characterized in that a vacuum smelting and atmosphere protected electroslag remelting combined smelting technology is adopted, the argon pressure is higher than the atmosphere pressure in the vacuum smelting process, and the argon pressure is higher than the atmosphere pressure in the electroslag remelting process. The smelting method can be used in duplex stainless steel smelting.

Description

technical field [0001] The invention relates to a stainless steel smelting technology, and in particular provides a method for smelting a duplex stainless steel slab. Background technique [0002] The structure of duplex stainless steel is austenite + ferrite duplex structure, which has the characteristics of high strength, good toughness, excellent pitting corrosion resistance and stress corrosion resistance, making it one of the important steel types for future stainless steel development. [0003] In the prior art, the content of alloy elements in duplex stainless steel is high, especially the content of nitrogen element is mostly between 1500-3000ppm, or even higher. Nitrogen is usually added by high-pressure nitrogen or direct addition of high-nitrogen alloys. However, no matter which of the above nitrogen-increasing methods is adopted, the metallurgical quality of duplex stainless steel will be difficult to control, and defects such as porosity, shrinkage cavity, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22B9/04C22B9/05C22B9/18
CPCC22B9/006C22B9/04C22B9/05C22B9/18C22C33/06Y02P10/25
Inventor 邢长军吴林姚春发宁小智杨忠民陈颖王慧敏李昭东
Owner CENT IRON & STEEL RES INST
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