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Two-phase stainless steel twin-roll thin strip cast rolling production technology

A duplex stainless steel, twin-roll thin strip technology, applied in metal rolling and other directions, can solve the problems of unresolved thin-gauge production, long production cycle of billet rolling, increased smelting difficulty and cost, and avoid edge cracking. and peeling defects, microstructure refinement, and the effect of reducing the cost of pickling

Inactive Publication Date: 2017-09-22
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the existing technology solves the problems of edge cracking and surface peeling in the hot rolling process of duplex stainless steel, and can realize the production of specifications with a thickness of more than 4mm in hot rolling, but the composition requirements are harsh, which increases the difficulty and cost of smelting. The production cycle is long, the corresponding energy consumption is also high, the production organization is difficult, and the production problem of thin specifications below 4mm has not been solved

Method used

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  • Two-phase stainless steel twin-roll thin strip cast rolling production technology

Examples

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Embodiment 1

[0024] A kind of thickness 1.0mm, steel type 2205 duplex stainless steel twin-roll thin 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 duplex stainless steel molten steel refined in the LF ladle refining furnace to the ladle turret, and calm it down for 25 minutes;

[0026] (2) Molten steel is injected into the tundish: the tundish is blown with argon for 20 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, and the superheat is controlled at 30°C; tundish covering agent;

[0027] (3) Twin-roll casting: molten steel is injected into the twin-roll casting machine through the submerged nozzle, the casting belt speed is 150m / min, the preset roll gap of the casting roll is 1.5mm, and the molten steel is protected by argon during the flow process. The pressure is 0.5MPa, ...

Embodiment 2

[0034] A kind of thickness 2.0mm, steel type 2304 duplex stainless steel, a kind of duplex 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 duplex 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, and the superheat is controlled at 30°C; tundish covering agent;

[0037] (3) Twin-roll casting: molten steel is injected into the twin-roll casting machine through the submerged nozzle, the casting belt speed is 100m / min, the preset roll gap of the casting rolls is 3.0mm, and a mixed gas of argon and hydrogen is used during the molten ...

Embodiment 3

[0044] A kind of thickness 4.0mm, steel grade 2507 super duplex 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 duplex stainless steel molten steel refined in the LF ladle refining furnace to the ladle turret, and calm it down for 15 minutes;

[0046] (2) Molten steel is injected into the tundish: the tundish is blown with argon for 10 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, and the superheat is controlled at 20°C; tundish covering agent;

[0047] (3) Twin-roll casting: molten steel is injected into the twin-roll casting machine through the submerged nozzle, the casting belt speed is 70m / min, the preset roll gap of the casting roll is 4.5mm, and argon gas is used for protection during the flow of molten steel. The pressure is 0.3MPa,...

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Abstract

The invention relates to a duplex stainless steel twin-roller thin strip casting and rolling production process, which includes the following steps: (1) lifting molten steel with qualified composition to a large ladle rotary table; (2) injecting molten steel into the tundish; (3) twin-roller Casting and rolling; (4) Hot rolling of strip; (5) Cooling of strip and cutting off the head and tail; (6) Coiling of strip. The invention directly produces duplex stainless steel thin strips through twin-roll casting and rolling, simplifying the hot rolling process and avoiding edge cracks and peeling defects caused by poor thermoplasticity of duplex stainless steel during hot rolling in traditional processes, as well as difficulties in producing thin-specification products. And other issues. Through the combination of double-roll casting and hot rolling, the product specifications are complete, providing qualified raw materials for the subsequent cold rolling process, shortening the production process and reducing energy consumption.

Description

technical field [0001] The invention belongs to the technical field of metallurgical engineering, and relates to a duplex stainless steel twin-roll strip casting and rolling production process. Background technique [0002] Duplex stainless steel is a steel grade with excellent corrosion resistance, high strength and good welding performance, etc. It is widely used in papermaking, petrochemical and marine engineering and other fields. However, during the hot rolling production process of duplex stainless steel, it is always in the two-phase region. The uncoordinated deformation of the two phases of ferrite and austenite leads to poor thermoplasticity, and a high incidence of edge cracks and surface peeling defects. Especially in the process of hot-rolling thin strips, due to the rapid temperature drop and the large deformation resistance in the later stage of rolling, it is easy to cause pile-up failures, resulting in limited product specifications, which seriously affects i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/06B21B1/46B21B3/02
CPCB22D11/0622B21B1/463B21B3/02B22D11/002B22D11/0697
Inventor 刘国平陈兴润宋治屏杨作宏权芳民
Owner JIUQUAN IRON & STEEL GRP
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