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Coiling method for stainless steel dual-phase steel

A technology of dual-phase steel and stainless steel, applied in the direction of temperature control, etc., can solve the problem of not being raised, and achieve the effect of preventing brittle fracture

Inactive Publication Date: 2017-12-15
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it is often stated in the literature that the dual-phase steel has a temperature management interval between the σ phase and the management interval of 475°C, that is, the temperature at the end of rolling is controlled above 980°C in the σ phase precipitation interval, and the rapid cooling is below 750°C (within 5min), but There is no specific plan on how to achieve stable target temperature management

Method used

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  • Coiling method for stainless steel dual-phase steel
  • Coiling method for stainless steel dual-phase steel
  • Coiling method for stainless steel dual-phase steel

Examples

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Embodiment 1

[0042] The present embodiment provides a kind of coiling method of 2205 steel types, and it comprises the following steps:

[0043] Set the furnace temperature of the coil furnace of the finishing mill to 1000-1050°C, and control the final rolling temperature of 2205 steel to >1000°C;

[0044] Place the rough-rolled 2205 strip in the coil furnace of the finishing mill for finish rolling to obtain 3.0mm-10mm thick finish-rolled 2205 strip;

[0045] Laminar cooling is carried out on the 2205 steel strip after the above finish rolling, and the cooling water flow rate is preset according to the final rolling temperature, thickness and forward speed of the 2205 steel type, and the surface temperature of the 2205 steel strip is detected in real time by the temperature detection device , feed back the detected real-time temperature to the cooling water flow control device, adjust the dynamic switch of the laminar cooling water nozzle (header) to control the cooling water flow, make t...

Embodiment 2

[0051] Present embodiment provides a kind of coiling method of 2507 steel grades, and it comprises the following steps:

[0052] Set the furnace temperature of the coil furnace of the finishing mill to 1010-1050°C, and control the final rolling temperature of 2507 steel to >1020°C;

[0053] Place the 2507 steel strip after the rough rolling in the coil furnace of the finishing mill and carry out the finishing rolling to obtain the 2507 steel strip after the finishing rolling with a thickness of 5.0m-8.0mm;

[0054] Laminar cooling is carried out on the 2507 steel strip after the above finish rolling, and the cooling water flow rate is preset according to the final rolling temperature, thickness and forward speed of the 2507 steel type, and the surface temperature of the 2507 steel strip is detected in real time by the temperature detection device , feed back the detected real-time temperature to the cooling water flow control device, adjust the dynamic switch of the laminar co...

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Abstract

The invention provides a coiling method for stainless steel dual-phase steel. The coiling method comprises the following steps: placing a roughly-rolled dual-phase steel plate blank in a coiling furnace of a fine rolling machine and carrying out fine rolling calendering to obtain dual-phase steel strip steel subjected to the fine rolling calendering; sequentially carrying out laminar cooling, coiling and water-cooling pool cooling on the dual-phase steel strip steel subjected to the fine rolling calendering; and cooling the dual-phase steel strip steel to achieve room temperature and then obtaining a dual-phase steel product, wherein the furnace temperature of the coiling furnace of the fine rolling machine is 1000-1050 DEG C, and the coiling temperature is 450-750 DEG C. The dual-phase steel plate blank comprises 2205 steel grade or 2507 steel grade, wherein the coiling temperature of the 2205 steel grade is 600-750 DEG C; and the coiling temperature of the 2507 steel grade is 450-700 DEG C.

Description

technical field [0001] The invention belongs to the field of metallurgical calendering and relates to a method for coiling stainless steel duplex steel. Background technique [0002] Duplex steel has a typical 1:1 duplex structure of austenite and ferrite, and contains a large amount of corrosion resistance strengthening elements such as Cr, Mo and N. Therefore, the dual-phase steel is resistant to salt corrosion SCC, crevice corrosion, wear and erosion resistance is very high, has high strength, makes the product lightweight, and has the characteristics of good welding performance. Therefore, stainless steel duplex steel is widely used and has high added value. [0003] However, hot-rolled dual-phase steel is prone to production quality accidents such as edge cracks and brittle fractures in production, and the operation is difficult. The reasons and difficulties are mainly reflected in the temperature control of the sigma phase precipitation interval (700-975°C) at 850°C ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74
CPCB21B37/74
Inventor 韦培友钱智君顾海峰
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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