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Manufacturing method of high silicon stainless steel for resisting high temperature concentrated sulphuric acid and equipment thereof

A manufacturing method and stainless steel technology, applied in the direction of improving energy efficiency and process efficiency, can solve the problems of affecting the corrosion resistance of materials, low forging yield and high inclusion content, and achieve excellent high temperature sulfuric acid corrosion resistance. , Simple manufacturing process, uniform composition effect

Active Publication Date: 2017-11-03
LUOYANG SUNRUI SPECIAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: the forging billet yield of steel ingot is low, up to 75%, the purity of the material is low, and the content of inclusions is high, which affects the corrosion resistance of the material
The disadvantage of this process is: in order to avoid the burning loss of Si element in the process of electroslag remelting, the electroslag remelting furnace with full protection atmosphere is used for smelting, so as to avoid the oxygen in the atmosphere from entering the steel and burning Si element, and the electroslag remelting furnace with full protection atmosphere is heavy. Furnace equipment investment is high, which is 5-6 times that of conventional electroslag remelting furnaces, resulting in high production costs. The production cost per ton of steel is twice that of conventional electroslag remelting furnaces, making it difficult to popularize and apply

Method used

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  • Manufacturing method of high silicon stainless steel for resisting high temperature concentrated sulphuric acid and equipment thereof
  • Manufacturing method of high silicon stainless steel for resisting high temperature concentrated sulphuric acid and equipment thereof
  • Manufacturing method of high silicon stainless steel for resisting high temperature concentrated sulphuric acid and equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Example 1: A high-silicon stainless steel electroslag remelting ingot of Φ360 mm.

[0089] The first step is to smelt the consumable electrode by adopting the "medium frequency induction + AOD refining" process. The electrode specification is Φ260mm×2500mm. The chemical composition of the electrode is shown in Table 1.

[0090] Table 1 Electrode chemical composition (wt%)

[0091]

[0092] The second step is to polish the surface of the consumable electrode.

[0093] In the third step, according to the principle of thermodynamics, calculate the SiO required in the slag discharge system when the Si burning reaction reaches equilibrium. 2 theoretical content, then by SiO 2 Select the matching slag system for the theoretical content, the specific method is:

[0094] (1) In the stage of electroslag remelting, the electrode is inserted into the liquid slag and gradually melted, and the metal droplets pass through the slag pool, and the reaction occurs:

[0095] [Si]+2...

Embodiment 2

[0112] Example 2: Electroslag remelting ingot of high silicon stainless steel with Φ440 mm.

[0113] The first step is to smelt the consumable electrode by adopting the "medium frequency induction + AOD refining" process. The electrode specification is Φ310mm×3500mm. The chemical composition of the electrode is shown in Table 1.

[0114] Table 2 Electrode chemical composition (weight %)

[0115]

[0116] The second step is to polish the surface of the consumable electrode.

[0117] The third step is to calculate according to the method of implementation 1 The activity value of is: =0.04, then the theoretical molar concentration of SiO2 in the design slag system is 0.04, and the mass percentage is 3%.

[0118] The third step is to prepare slag. The slag system adopts CaF 2 、Al 2 o 3 , CaO, SiO 2 Quaternary slag system, the weight percentage of each component is 69%, 15%, 13%, 3% respectively, and the slag amount is 80kg. Put the slag separately into the electric f...

Embodiment 3

[0125] Example 3: Electroslag remelting ingot of high silicon stainless steel with a diameter of 560mm.

[0126] The first step is to smelt the consumable electrode by adopting the "medium frequency induction + AOD refining" process. The electrode specification is Φ420mm×3000mm. The chemical composition of the electrode is shown in Table 3.

[0127] Table 3 Electrode Chemical Composition (wt%)

[0128] alloy

C

Si

mn

S

P

Cr

Ni

Mo

Cu

Al

Ce

Nb

O

N

electrode

0.015

5.5

0.6

0.01

0.017

18.05

21.5

0.66

2.2

0.04

0.04

0.04

0.006

0.007

[0129] The second step is to polish the surface of the consumable electrode.

[0130] The third step is to calculate according to the method of implementation 1 The activity value of is: =0.05, then the SiO in the design slag system 2 The theoretical molar concentration is 0.05, and the mass percentage is 4%.

[0131] The third step is t...

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Abstract

The invention relates to a manufacturing method of high silicon stainless steel for resisting the high temperature concentrated sulphuric acid and equipment thereof. Firstly, ingredients of chemical elements of a steel ingot are designed, and a round-shaped electrode is smelted through the technology of intermediate frequency induction furnace primary smelting and argon oxygen decarburizing furnace refining; and the steel ingot is smelted through the technology of electro slag remelting (ESR). The equipment of the manufacturing method of the high silicon stainless steel for resisting the high temperature concentrated sulphuric acid includes the electrode and a liquid slag pool; a protection cover is arranged above the liquid slag pool, an inner cavity is formed in the protection cover, and the electrode is arranged in the inner cavity; an inner wall air outlet hole for inert gas is formed in the bottom of the protection cover, a main air inlet hole for the inert gas is formed below the side face, and a main air inlet hole for the inert gas is formed above the side face. The high silicon stainless steel prepared by the method and the equipment is high in concentrated sulphuric acid corrosion resistance under a high temperature environment, and the corrosion rate of the high silicon stainless steel is lower than 0.08mm / year in a H2SO4 solution with the concentration of 98% at the temperature of 150 DEG C.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a method and equipment for manufacturing high-silicon stainless steel for high-temperature-resistant concentrated sulfuric acid. Background technique [0002] Sulfuric acid is a basic chemical raw material with strong corrosiveness and complicated corrosion process. High-temperature concentrated sulfuric acid produces hydrogen depolarization corrosion and oxygen depolarization corrosion. In high-temperature concentrated sulfuric acid, high-silicon stainless steel has excellent corrosion resistance and is the preferred material in the sulfuric acid industry. Due to the special application environment of high-silicon stainless steel, not only the material is required to have excellent resistance to pitting corrosion crevice corrosion and stress corrosion cracking in high-temperature concentrated sulfuric acid, but also to have excellent plastic deformation properties, ...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22B9/187C22C38/02C22C38/04C22C38/42C22C38/44C22C38/06C22C38/48
CPCC22B9/18C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48Y02P10/25
Inventor 王新鹏张春林罗利阳张娟娟梁晓辉朱晓锋陈帅超
Owner LUOYANG SUNRUI SPECIAL EQUIP
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