Processing method for producing low-cost high-formability IF (interstitial-free) steel

A processing method and formability technology, applied in metal rolling, temperature control, etc., can solve problems such as finishing rolling easily falling into the two-phase region, and achieve the effects of low cost, high production efficiency, and high product formability

Inactive Publication Date: 2012-07-18
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Publication No. CN 101618396 B Chinese patent "A method for ferritic rolling of interstitial-free steel on traditional hot rolling mills" discloses a method for producing hot-rolled IF steel plates, which mainly solves the problems of traditional IF steel. The technical problem that the finishing rolling in the austenitic zone rolling is easy to fall into the two-phase zone

Method used

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  • Processing method for producing low-cost high-formability IF (interstitial-free) steel
  • Processing method for producing low-cost high-formability IF (interstitial-free) steel
  • Processing method for producing low-cost high-formability IF (interstitial-free) steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1, the steel factory refines qualified molten steel, and continuously casts it into a slab of 70*1270mm. The mass percentage of the chemical composition is C: 0.002%, Si: 0.013%, Mn: 0.15%, P: 0.006%, S: 0.004%, Al : 0.040%, the balance is Fe; the continuous casting slab is heated to 1080°C, and after the billet comes out of the furnace, it enters two rough rolling mills. , the final rolling temperature is 775-790°C, and the thickness of the finished product is 4.0mm. After finishing rolling, it enters laminar flow cooling, and then cools to 700-720°C for coiling. After coiling, it is pile-cooled and air-cooled, and then naturally cooled to room temperature. The chemical composition is listed in Table 1, the process parameters are listed in Table 2, and the mechanical properties of the rolled material are listed in Table 3.

Embodiment 2

[0031] Example 2: Steel mills refine qualified molten steel and continuously cast it into a slab of 70*1270mm. The mass percentages of chemical components are C:0.002%, Si:0.010%, Mn:0.12%, P:0.005%, S:0.006%, Al : 0.052%, the balance is Fe; the continuous casting slab is heated to 1110°C, and after the billet comes out of the furnace, it enters 2 rough rolling mills. , the final rolling temperature is 760-780°C, and the thickness of the finished product is 4.0mm. After finishing rolling, enter laminar flow cooling, cool to 700-720°C for coiling, stack cooling and air cooling after coiling, and naturally cool to room temperature. The chemical composition is listed in Table 1, the process parameters are listed in Table 2, and the mechanical properties of the rolled material are listed in Table 3.

Embodiment 3

[0032]Example 3: Steel mills refine qualified molten steel and continuously cast it into 70*1270mm slabs. The mass percentages of chemical components are C: 0.003%, Si: 0.12%, Mn: 0.16%, P: 0.006%, S: 0.005%, Al : 0.034%, the balance is Fe; the continuous casting slab is heated to 1070°C, and after the billet comes out of the furnace, it enters 2 rough rolling mills. Rolling, the final rolling temperature is 760-780°C, and the thickness of the finished product is 3.5mm. After finishing rolling, it enters laminar cooling and air-cools to 720-740°C for coiling. The chemical composition is listed in Table 1, the process parameters are listed in Table 2, and the mechanical properties of the rolled material are listed in Table 3.

[0033]

[0034]

[0035]

[0036] The invention adopts a ferrite rolling process to produce high formability IF steel based on the thin slab continuous casting and rolling process, and has the advantages of simple process, low cost, high product...

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Abstract

The invention relates to a processing method for producing low-cost high-formability IF (interstitial-free) steel, which is based on thin-slab continuous casting and rolling and adopts a ferrite rolling process to produce the IF steel, belonging to the technical field of IF steel production. The processing method comprises the following working procedures of steelmaking, continuous casting, heating, rolling, cooling and coiling. A thin-slab continuous casting machine is adopted, the thickness of a continuous casting slab is at most 100mm, and the charging temperature is at least 880 DEG C. During hot rolling, a roughing mil and a finishing mill keep a continuous rolling relationship and keep micro-tension control, and water cooling equipment is used between the roughing mil and the finishing mill and is used for uniformly reducing the temperature of an intermediate slab with a thickness of 12-25mm from the temperature at least 950 DEG C of the outlet of the roughing mil into the range of 750-850 DEG C. Finish rolling is carried out in a ferrite area, and a lubrication rolling technology is adopted. The coiling temperature is higher and is 680-760 DEG C, slow cooling is carried out after coiling, and thereby an annealing process is finished. The invention provides a method for obtaining high-formability hot rolled sheets without cold rolling and cover annealing. The method has the advantages of being simple in process, low in cost, high in production efficiency, short in flow and the like, and the formability of products is higher.

Description

technical field [0001] The invention relates to a processing method for producing IF steel with low cost and high formability. The IF steel is produced by adopting a ferrite rolling process based on thin slab continuous casting and rolling, and belongs to the technical field of IF steel production. Background technique [0002] IF steel, the full name of Interstitial-Free Steel, that is, interstitial-free steel, sometimes called ultra-low carbon steel, has excellent deep drawing performance, elongation and r value can reach 50% and 2.0 or more, and is widely used in the automotive industry. widely used. At present, the general process of using IF steel to produce high formability products is steelmaking - LF refining - RH refining - continuous casting - heating - hot rolling in austenite zone - coiling - acid continuous rolling - full hydrogen bell annealing. In the hot rolling stage, due to the high transformation point of IF steel, Ar3 exceeds 900 °C, in order to avoid ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46B21B37/74B21C47/02C22C38/06C21D8/02
Inventor 徐杰陈礼斌齐长发吕长宝王维东宋海武韩旭光褚春光马春红王春峰
Owner HEBEI IRON AND STEEL
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