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Automobile dual-phase steel and machining method thereof

A processing method and dual-phase steel technology, applied in the field of iron and steel metallurgy, can solve the problems of the inability to realize the dual-phase steel segmental cooling process, air-cooling temperature, air-cooling time and coiling temperature cannot be stably controlled, and achieve stable and controllable air-cooling temperature , To ensure the effect of process temperature stability

Pending Publication Date: 2019-07-12
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A traditional hot rolling line generally includes a heating zone, a rough rolling zone, an intermediate roller table, a finishing zone, a laminar cooling device, and a coiler. The laminar cooling device only has a conventional sparse cooling mode, which cannot realize the processing of dual-phase steel. The required segmental cooling process; and the rolling process of dual-phase steel requires a lower coiling temperature, generally in the range of 200-400 ° C, while the finishing rolling process of traditional hot rolling lines is generally speed-up rolling, and the air-cooling temperature , air cooling time and coiling temperature cannot be stably controlled

Method used

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  • Automobile dual-phase steel and machining method thereof
  • Automobile dual-phase steel and machining method thereof
  • Automobile dual-phase steel and machining method thereof

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Effect test

Embodiment 1

[0032] like Figure 1-Figure 5 As shown, the chemical composition of automotive dual-phase steel is C: 0.06wt%, Mn is 1.28wt%, Ti is 0.015wt%, Nb is 0.023wt%, Cr is 0.18wt%, Als is 0.03wt%, and the balance Fe and unavoidable impurities, the thickness of the dual-phase steel is 6mm, the preparation method of the dual-phase steel includes:

[0033] 1) Pretreatment and smelting of molten iron containing chemical components of automotive dual-phase steel;

[0034] 2) casting the smelted liquid metal to obtain a billet;

[0035] 3) heating the billet in a heating furnace, the soaking temperature of the heating furnace is 1235°C;

[0036] 4) Adopt two-stage rolling, control the exit temperature of rough rolling at 1025°C, limit the acceleration of rolling mill equipment through primary control, and limit the acceleration of finishing rolling temperature to 0m / s 2 , cancel the closed-loop temperature control of the secondary model, use the hot coil box to reduce the temperature de...

Embodiment 2

[0047] The chemical composition of dual-phase steel for automobiles is C: 0.05wt%, Mn: 1.33wt%, Ti: 0.020wt%, Nb: 0.028wt%, Cr: 0.22wt%, Als: 0.04wt%, and the balance is Fe and Unavoidable impurities, the thickness of the dual-phase steel is 11mm, and the preparation methods of the dual-phase steel include:

[0048] 1) Pretreatment and smelting of molten iron containing chemical components of automotive dual-phase steel;

[0049]2) casting the smelted liquid metal to obtain a billet;

[0050] 3) heating the billet in a heating furnace, the soaking temperature of the heating furnace is 1235°C;

[0051] 4) Adopt two-stage rolling, control the exit temperature of rough rolling at 1040°C, limit the acceleration of rolling mill equipment through primary control, and limit the acceleration of finishing rolling temperature to 0m / s 2 , canceled the temperature closed-loop control of the second-level model, and used the hot coil box to reduce the temperature deviation of the head and...

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Abstract

The invention provides automobile dual-phase steel and a machining method thereof. The automobile dual-phase steel comprises the chemical components including, by weight percent, not greater than 0.08% of C, 1.25-1.35% of Mn, 0.01-0.025% of Ti, 0.02-0.03% of Nb, 0.15-0.25% of Cr, 0.02-0.05% of Als and the balance Fe and inevitable impurities. The machining method comprises the process including the steps of smelting; casting; heating; rolling; cooling; and coiling. By controlling parameters including the rough rolling inlet temperature, the precision rolling speed, the finish rolling temperature, the layered cooling boiled water valve group number, the coiling temperature and the like, step cooling of the dual-phase steel is achieved on the basis of a traditional steel strip hot rolling line, accordingly, a satisfactory metallographic structure of the dual-phase steel is obtained, and stable production of the dual-phase steel is finally achieved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an automobile dual-phase steel and a processing method thereof. Background technique [0002] With the increasing shortage of resources and people's increasing emphasis on environmental protection, the automobile industry is gradually developing towards methods such as lightweight car body, energy saving, high safety factor, and environmental friendliness. In order to meet the requirements of weight reduction, energy saving, fatigue resistance and anti-collision performance of the automobile body, the use of thinner but higher strength steel has become the mainstream trend of automobile production. [0003] Dual-phase steel refers to steel mainly composed of ferrite and martensite phases, which can be obtained from low-carbon steel or low-alloy steel after critical zone heat treatment or controlled rolling. By correctly controlling the composition and heat treat...

Claims

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Application Information

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IPC IPC(8): C22C38/26C22C38/28C22C38/06C22C38/04C21D8/02B21B3/02B21B37/74
CPCC22C38/26C22C38/28C22C38/06C22C38/04C21D8/0205B21B3/02B21B37/74B21B2201/16B21B2201/04
Inventor 张振卫白少金宋振官孙广兴楚斌王海梁段家庆
Owner RIZHAO STEEL HLDG GROUP
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