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Twin-roll strip casting-rolling production process for superaustenitic stainless steel

A technology of austenitic stainless steel and double-roll thin strip, applied in the direction of metal rolling, can solve the problems of reducing the mechanical properties and corrosion resistance of materials, affecting the popularization and application of super austenitic stainless steel, reducing product quality and yield, etc. , to achieve the effect of avoiding surface cracking, avoiding layered cracking and improving the surface quality of products

Active Publication Date: 2017-08-11
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the amount of precipitation reaches a certain value, these intermediate phases will reduce the mechanical properties and corrosion resistance of the material, thereby affecting the performance of the material
[0003] In the process of producing super austenitic stainless steel by the existing process, due to the high alloy content of super austenitic stainless steel, the manufacturing process requirements of this type of steel become very high, which increases the difficulty of production and is prone to delamination during hot rolling Cracking and surface cracking, etc., which greatly reduce product quality and yield
In addition, due to the high strength of super austenitic stainless steel, hot rolling can only produce thicknesses above 5mm, which seriously affects the popularization and application of super austenitic stainless steel

Method used

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  • Twin-roll strip casting-rolling production process for superaustenitic stainless steel

Examples

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Effect test

Embodiment 1

[0024] A kind of thickness 1.2mm, steel type 904L super austenitic stainless steel twin-roll strip casting and rolling production process comprises the following steps:

[0025] (1) Hoist the molten steel with qualified composition to the ladle turret: hoist the super austenitic stainless steel molten steel refined in the LF ladle refining furnace to the ladle turret, and calm it down for 20 minutes;

[0026] (2) Molten steel is injected into the tundish: the tundish is blown with argon for 15 minutes to drive out the air in the tundish, and then the molten steel is injected from the ladle into the tundish through the long nozzle. tundish covering agent;

[0027] (3) Twin-roll casting: molten steel is injected into the twin-roll casting machine through the submerged nozzle, the casting billet speed is 120m / min, the preset roll gap of the casting roll is 1.5mm, and the molten steel is protected by argon gas during the flow process. The gas pressure is 0.5Mpa, and the strip thi...

Embodiment 2

[0034] A kind of thickness 1.8mm, steel type 904L super austenitic stainless steel twin-roll strip casting and rolling production process comprises the following steps:

[0035] (1) Hoist the molten steel with qualified composition to the ladle turret: hoist the super austenitic stainless steel molten steel refined in the LF ladle refining furnace to the ladle turret, and calm it down for 20 minutes;

[0036] (2) Molten steel is injected into the tundish: the tundish is blown with argon for 15 minutes to drive out the air in the tundish, and then the molten steel is injected from the ladle into the tundish through the long nozzle. tundish covering agent;

[0037] (3) Twin-roll casting: molten steel is injected into the twin-roll casting machine through the submerged nozzle, the billet speed is 100m / min, the preset roll gap of the casting rolls is 2.5mm, and argon and hydrogen are mixed during the flow of molten steel Gas protection, wherein the volume ratio of argon and hydro...

Embodiment 3

[0044] A kind of thickness 3.6mm, steel type 904L super austenitic stainless steel twin-roll strip casting and rolling production process comprises the following steps:

[0045] (1) Hoist the molten steel with qualified composition to the ladle turret: hoist the super austenitic stainless steel molten steel refined in the LF ladle refining furnace to the ladle turret, and calm it down for 20 minutes;

[0046] (2) Molten steel is injected into the tundish: the tundish is blown with argon for 15 minutes to drive out the air in the tundish, and then the molten steel is injected from the ladle into the tundish through the long nozzle. tundish covering agent;

[0047] (3) Twin-roll casting: Molten steel is injected into the twin-roll casting machine through the submerged nozzle, the billet speed is 80m / min, and the preset roll gap of the casting rolls is 4.5mm. Argon gas is used for protection during the flow of molten steel, the pressure of the protective gas is 0.5MPa, the thick...

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Abstract

The invention relates to a twin-roll strip casting-rolling production process for superaustenitic stainless steel. The twin-roll strip casting-rolling production process comprises the following steps: (1) hoisting and swinging molten steel with qualified components to a ladle turret; (2) injecting the molten steel into a tundish; (3) carrying out twin-roll casting-rolling; (4) carrying out strip billet hot-rolling; (5) carrying out strip steel cooling and head-tail removal; and (6) carrying out strip steel coiling. According to the twin-roll strip casting-rolling production process disclosed by the invention, a superaustenitic stainless steel strip is directly produced through the twin-roll casting-rolling, so that the hot-rolling procedure is simplified, and the surface layer cracking and layering cracking of superaustenitic stainless steel during hot-rolling in the prior art are avoided. Production for strips with thin gauges of 1.0-3.5mm is realized through the combination of the twin-roll casting-rolling and the hot-rolling, and qualified raw materials are provided for the subsequent cold-rolling process, so that energy consumption is reduced while the production flow is shortened.

Description

technical field [0001] The invention belongs to the metallurgical engineering technical field of thin strip casting and rolling production, and specifically relates to a super austenitic stainless steel double-roll thin strip casting and rolling production process. Background technique [0002] The metallographic structure of super austenitic stainless steel is a full austenitic structure with a face-centered cubic structure. High strength, high hardness, good impact toughness, good welding performance, high temperature creep resistance and excellent corrosion resistance. The special chemical composition, structure and properties of super austenitic stainless steel make this steel widely used in various fields, especially in many harsh working conditions, such as pulp and paper industry, pharmaceutical industry, fertilizer industry and offshore, etc. field. However, due to the high alloy composition content of super austenitic stainless steel, especially Mo and Cr, it is e...

Claims

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Application Information

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IPC IPC(8): B22D11/06B21B1/46B21B3/02
CPCB21B1/463B21B3/02B22D11/002B22D11/0622B22D11/0697
Inventor 刘国平杨作宏宋治屏陈兴润
Owner JIUQUAN IRON & STEEL GRP
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