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Method for producing ultra-thin hot-rolled coils by continuous casting and rolling of thin slabs

A technology of continuous casting of thin slabs and hot-rolled coils, which is applied in metal rolling, metal rolling, manufacturing tools, etc., can solve problems such as the temperature requirements of difficult finish rolling of strip steel, and achieve the effect of stable batch production

Active Publication Date: 2015-12-09
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the extremely fast temperature drop in the production process of ultra-thin strip steel, coupled with the limitation of the maximum rolling speed mentioned above, it is difficult for the strip steel arriving at the finishing mill to meet the temperature requirements of finishing rolling

Method used

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  • Method for producing ultra-thin hot-rolled coils by continuous casting and rolling of thin slabs
  • Method for producing ultra-thin hot-rolled coils by continuous casting and rolling of thin slabs
  • Method for producing ultra-thin hot-rolled coils by continuous casting and rolling of thin slabs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: The method for producing ultra-thin hot-rolled coils by continuous casting and rolling of thin slabs takes 1250mm*1.0mm hot-rolled coils as an example, and the specific process is as follows.

[0052] Steelmaking process: smelting by converter, and alloying it by refining outside the furnace, its chemical composition and weight percentage are: C0.20%, Mn0.22%, Si0.11%, S0.005%, P0.019% , Als0.02%, B0.0012%, and the rest are Fe and unavoidable impurities.

[0053] Continuous casting process: continuous casting, casting slab casting speed control 4.7 m / min, furnace temperature 940-960 ℃, casting slab thickness control to 70mm, width 1260mm.

[0054] Heating process: uniform heating by regenerative automatic combustion control system, first stage furnace temperature 1290±10°C, second stage furnace temperature 1300±10°C, third stage furnace temperature 1300±10°C, heat preservation section 1260±10°C; slab heat preservation The time is 25 minutes; the furnace t...

Embodiment 2

[0060] Embodiment 2: The method for producing ultra-thin hot-rolled coils by continuous casting and rolling of thin slabs takes 1250mm*1.0mm hot-rolled coils as an example, and the specific process is as follows.

[0061] Steelmaking process: smelting by converter, and alloying by refining outside the furnace, its chemical composition and weight percentage are: C0.19%, Mn0.22%, Si0.14%, S0.06%, P0.018% , Als0.02%, B0.0011%, and the rest are Fe and unavoidable impurities.

[0062] Continuous casting process: continuous casting, casting slab casting speed control 4.5 m / min, furnace temperature 935 ~ 950 ℃, casting slab thickness control to 70mm, width 1260mm.

[0063] Heating process: uniform heating with regenerative automatic combustion control system, one plus 1290±10°C, two plus 1300±10°C, three plus 1300±10°C, heat preservation section 1260±10°C; slab heat preservation time 25 minutes; out of the furnace Temperature 1250±10℃; RDT1080~1090℃ (strip head 1140℃), FET1035~1045℃...

Embodiment 3

[0069] Embodiment 3: The method for producing ultra-thin hot-rolled coils by continuous casting and rolling of thin slabs takes 1250mm*1.0mm hot-rolled coils as an example, and the specific process is as follows.

[0070] Steelmaking process: smelting by converter, and alloying it by refining outside the furnace, its chemical composition and weight percentage are: C0.18%, Mn0.20%, Si0.12%, S0.10%, P0.025% , Als0.015%, B0.0030%, and the rest are Fe and unavoidable impurities.

[0071] Continuous casting process: continuous casting, casting slab casting speed control 4.6 m / min, furnace temperature 940-950 ℃, casting slab thickness control to 70mm, width 1260mm.

[0072] Heating process: uniform heating with regenerative automatic combustion control system, one plus 1290±10°C, two plus 1300±10°C, three plus 1300±10°C, heat preservation section 1260±10°C; slab heat preservation time 25 minutes; out of the furnace Temperature 1250±10℃; RDT1080~1090℃ (strip head 1140℃), FET1040~104...

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Abstract

The invention discloses a method for producing ultrathin hot-rolled coils from sheet billets by continuous casting and rolling. The method includes the technologic steps of (1) steelmaking process, (2) continuous casting process, (3) heating process, (4) hot rolling process and (5) cooling and coiling process. The continuous casting process includes drawing steel balls into continuous casting billets by means of continuous casting, wherein casting speed is controlled to be 4.5-4.7 meters / minute, feeding-to-furnace temperature is within a range from 935 DEG C to 960 DEG C, and thickness and width of the casting billets are controlled to be 70mm and 1260mm respectively. The heating process includes heating the continuous casting billets by a heating furnace with a three-step furnace temperature control function. The hot rolling process includes producing the heated continuous casting billets into ultrathin hot-rolled sheets via a roughing mill and a finishing mill, and controlling finishing temperature as 870 DEG C. The cooling and rolling process includes after the ultrathin hot-rolled sheets are subjected to laminar cooling, coiling at the temperature of 670 DEG C by means of positioning control through a side guide of a coiling machine so as to obtain the ultrathin hot-rolled coils. By reasonable control on rolling temperature, pressing mechanism and stable threading technology, the 1.0mm ultrathin hot-rolled coils are rolled stably in a single piece manner in the continuous casting and rolling flow of the sheet billets, and stable batch production of 1.00 ultrathin strip steel is realized.

Description

technical field [0001] The invention relates to a production method of hot-rolled coils, in particular to a method for producing ultra-thin hot-rolled coils by continuous casting and rolling of thin slabs. Background technique [0002] 1.0mm ultra-thin hot-rolled coils can not only reduce the number of cold-rolled rolling passes, reduce production costs, and save energy when used as cold-rolled raw materials, but also the most important thing is that hot-rolled ultra-thin strip steel is a unique product that truly realizes hot-rolled cooling. , can be widely used in high-end pipe making, electromechanical equipment shell lining, etc., with high added value and broad market prospects. [0003] At present, there are 13 thin slab continuous casting and rolling production lines in my country. The products cover common carbon steel, weathering steel, silicon steel, high carbon steel and other varieties. The thin specification products are mainly concentrated in 1.3mm and above sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B37/74B21B37/46B21B45/02B21C47/02C22C38/06
Inventor 宋嗣海杨晓江王春峰栗建辉吕耀强李杨信晓兵董跃星马晨尹国强安玉超王纪周李坤吕小虎
Owner HEBEI IRON AND STEEL
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