Low-cost super-high-strength carriage board and manufacture method thereof

A manufacturing method and a technology for car body panels, applied in the direction of improving process efficiency, etc., can solve the problems of light weight, low alloy cost, poor wear resistance, etc., and achieve the effect of good cold forming performance, excellent mechanical properties, and optimized process control

Inactive Publication Date: 2015-03-25
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Q345B has low strength and thick steel plate, which is not conducive to reducing the weight of the body, and its hardness is low and its wear resistance is poor
[0003] The literature "Development of 700MPa-class ultra-high-strength heavy-duty vehicle compartment plate" (Journal of Mechanical Engineering, Vol. It is only suitable for hot rolling; the patent application number "201310651567.0" named "a 590MPa grade hot-rolled steel plate for automobile body" has low cost, but still contains certain Nb and Ti, and is based on hot rolling production line ; The patent application number is "201310106549.4" and the name "an economical wear-resistant steel plate and its manufacturing method" provides a low-cost wear-resistant steel, and the alloy Cr content is still high, which is not conducive to reducing the purchase cost of automobile users

Method used

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  • Low-cost super-high-strength carriage board and manufacture method thereof
  • Low-cost super-high-strength carriage board and manufacture method thereof
  • Low-cost super-high-strength carriage board and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 185 tons of molten iron is smelted in a converter, heated to a temperature of 1300°C, and then 30 tons of scrap steel is added, and 0.13 tons of aluminum is added for deoxidation and alloying using a single slag process, and the slag is blocked in tapping, and the tapping temperature of the converter is controlled between 1620-1660°C. During the tapping process, the ladle must be bottom-blown with argon, and the molten steel must not be exposed. After the molten steel is smelted in a converter, it is refined outside the LF furnace, and 4.5 tons of ferromanganese and 0.67 tons of ferrosilicon are added, followed by vacuum degassing in the RH process. The vacuum degree of vacuum degassing is 0.25KPa, and the deep vacuum time is 20 minutes; Casting machine for continuous casting, control the superheat of molten steel 15-50 ℃; put the slab into the heating furnace and heat up to 1200 ℃ (the total reheating time is 250 minutes, soaking time is 40 minutes), and then in 20MPa ...

Embodiment 2

[0049] 185 tons of molten iron is smelted in a converter, heated to a temperature of 1250°C, and then 35 tons of scrap steel are added. Using a single slag process, 0.15 tons of aluminum is added for deoxidation and alloying, and the tapping temperature of the converter is controlled between 1620-1660°C. During the tapping process, the ladle must be bottom-blown with argon, and the molten steel must not be exposed. After the molten steel is smelted in the converter, it is refined outside the LF furnace, and 4.2 tons of ferromanganese and 0.73 tons of ferrosilicon are added. After that, the RH process is vacuum degassed. The temperature is 0.25KPa, and the deep vacuum time is 20min; the molten steel is sent to the casting machine for continuous casting, and the degree of superheat of the molten steel is controlled at 15-50°C; 269 ​​minutes, the soaking period is 30 minutes), then carry out high-pressure water descaling under 20MPa; then carry out, rough rolling, finish rolling, ...

Embodiment 3

[0052] 185 tons of molten iron is smelted in a converter, heated to a temperature of 1280°C, and then 40 tons of scrap steel is added. Using a single slag process, 0.16 tons of aluminum is added for deoxidation and alloying, and the tapping temperature of the converter is controlled between 1620-1660°C. During the tapping process, the ladle must be bottom-blown with argon, and the molten steel must not be exposed. After the molten steel is smelted in a converter, it is refined outside the LF furnace, and 4.0 tons of ferromanganese and 0.84 tons of ferrosilicon are added, followed by vacuum degassing in the RH process. The vacuum degree of vacuum degassing is 0.25KPa, and the deep vacuum time is 20 minutes; Casting machine for continuous casting, control the superheat of molten steel 15-50 ℃; put the slab into the heating furnace and heat up to 1200 ℃ (the total reheating time is 285 minutes, the soaking time is 37 minutes), and then at 20MPa Under high pressure water descaling...

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Abstract

The invention discloses a low-cost super-high-strength carriage board and a manufacture method thereof. The manufacture method comprises the following steps: molten iron is subjected to converter smelting and heated to 1,250-1,350 DEG C, then scrap steel is added, aluminum is added with a single slag process for deoxidization and alloying process, slag stopping during tapping is performed, bottom argon blowing operation is required for a ladle in a tapping process, molten steel is subjected to LF (ladle furnace) secondary refining after converter smelting, ferromanganese and ferrosilicon are added, an RH (Ruhrstahl Heraeus) process is performed for vacuum dagassing, the molten steel is sent to a casting machine for continuous casting, and a manufactured slab is subjected to reheating, descaling, rough milling, finish rolling, hot straightening, heat treatment, shearing, hardening and tempering, sampling, inspection and warehousing of finished products. Low-carbon composition design is adopted, elements for improving the hardenability are added moderately, the cleanliness of steel is improved, and the low-cost super-high-strength carriage board is manufactured through optimized control of heat treatment and hardening and tempering processes.

Description

technical field [0001] The invention relates to the technical field of medium and thick plates, in particular to a low-cost ultra-high-strength car body plate and a manufacturing method thereof. Background technique [0002] With the progress of society and the development of technology, the light weight, heavy load and high efficiency of automobiles have become the general trend. Especially for heavy-duty trucks, on the one hand, the load is required to be continuously increased, and on the other hand, the self-weight is required to be continuously reduced. The truck compartment is generally made of different materials according to the purpose: wear-resistant steel is used as the lining plate, and Q345B is used as the compartment half. Usually, due to the high price of wear-resistant steel, the cost of using wear-resistant steel for the entire carriage is relatively high, so generally only wear-resistant steel is used as the lining plate, and Q345B is selected for the rest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C33/06C21D8/02
CPCC21D8/0205C22C38/02C22C38/04C22C38/06Y02P10/20
Inventor 刘泽田陆斌李浩高军惠鑫王宏盛华国龙王雅彬
Owner INNER MONGOLIA BAOTOU STEEL UNION
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