Method for rolling interstitial free steel ferrite on traditional hot rolling mills

A technology of interstitial atom-free steel and ferrite, which is applied in the field of IF steel rolling, can solve the problem that the finishing rolling is easy to fall into the two-phase region, and achieve the effect of improving the structure and deep drawing performance

Active Publication Date: 2010-01-06
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for realizing ferritic rolling of IF steel on a traditional hot rolling mill, which mainly solves the problem that the traditional IF steel in austenitic zone rolling is easy to fall into the two-phase zone in finishing rolling question

Method used

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  • Method for rolling interstitial free steel ferrite on traditional hot rolling mills

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Example 1: The hot rolling process is as follows: slab heating temperature 1148°C, finish rolling inlet temperature 862°C, finish rolling temperature 810°C, coiling temperature 704°C, middle slab thickness 38mm, hot rolled sheet thickness specification 2.05mm. The chemical composition of molten steel is: C: 0.0025%; Si: 0.016%; Mn: 0.16%; P: 0.012%; S: 0.0060%; Ti: 0.048%.

Embodiment 2

[0016] Example 2: The hot rolling process is as follows: slab heating temperature 1145°C, finish rolling inlet temperature 850°C, finish rolling temperature 800°C, coiling temperature 702°C, middle slab thickness 38mm, hot rolled plate thickness specification 2.1mm. The chemical composition of molten steel is: C: 0.0022%; Si: 0.015%; Mn: 0.17%; P: 0.013%; S: 0.0056%; Ti: 0.052%.

Embodiment 3

[0017] Example 3: The hot rolling process is: slab heating temperature 1135°C, finish rolling entrance temperature 860°C, finish rolling temperature +815°C, coiling temperature 692°C, middle slab thickness 38mm, hot rolled sheet thickness specification 1.8mm . The chemical composition of molten steel is: C: 0.0025%; Si: 0.018%; Mn: 0.15%; P: 0.015%; S: 0.0062%; Ti: 0.044%.

[0018] The performance of the hot-rolled coil in embodiment 1-3 is shown in the table below

[0019]

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Abstract

The invention relates to an IF steel rolling method, in particular to a method for rolling interstitial free steel ferrite on traditional hot rolling mills, which mainly solves the technical problem that finish rolling of the traditional IF steel austenite-region rolling is easy to fall into a two-phase region. The method for rolling interstitial free steel ferrite on traditional hot rolling mills comprises the steps of heating a slab through a heating furnace, performing rough rolling in a rough rolling mill, performing finish rolling in a finish rolling mill, performing laminar cooling and coiling. The method is characterized in that rough rolling is performed in an austenite region; the slab is cooled to the temperature at which an austenite structure is basically changed into a ferrite structure after rough rolling is over; finish rolling is performed in a ferrite region; the heating temperature of the slab is 1,130 + / - 20 DEG C; the inlet temperature of finish rolling is 850 + / - 20 DEG C; the final rolling temperature is 820 + / - 20 DEG C; the coiling temperature is 710 + / - 20 DEG C; and the thickness of an intermediate slab is 36 to 40 mm. The method mainly performs IF steel rolling on the traditional hot rolling mills.

Description

technical field [0001] The invention relates to a rolling method of IF steel, in particular to a method for realizing ferrite rolling of IF steel on a traditional hot rolling mill. Background technique [0002] IF steel (Interstitial-Free Steel) is interstitial-free steel. The basic characteristics of this type of steel are extremely low carbon content, excellent deep drawing performance, and broad application prospects in automobiles and home appliance panels. [0003] The rolling of traditional IF steel is carried out in the austenite zone, that is, the rough rolling and finishing rolling temperatures are both at Ar 3 above, but Ar of IF steel 3 The temperature is higher (880-920°C), and when rolling thin-gauge products, the heat dissipation is larger, and the finish rolling is easy to fall into the two-phase region, which has an adverse effect on the performance of the steel. When the C content is less than 0.0218%, there is a single-phase ferrite zone. When rolling in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/74B21B37/16B21B45/02
Inventor 穆海玲夏小明郭振和裴新华刘学伟
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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