Process for producing twin crystal inducement plastic steel material with high carbon content

A technology for twin-induced plasticity and steel materials, which is applied in metal rolling, manufacturing tools, temperature control, etc., can solve the problems of limited application scope and low material properties, and achieves low cost, simple preparation method and good application prospects. Effect

Inactive Publication Date: 2010-06-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is a method of continuous production of thin strips using special equipment, its application range is greatly limited, and the properties of the produced materials are low

Method used

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  • Process for producing twin crystal inducement plastic steel material with high carbon content
  • Process for producing twin crystal inducement plastic steel material with high carbon content
  • Process for producing twin crystal inducement plastic steel material with high carbon content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The steel plate is prepared by traditional vacuum smelting and hot rolling process

[0026] Its composition is: C%=0.63wt%, Mn%=23.6wt%, Si%=0.20wt%, P%=0.009wt%, S%=0.0065wt%, Al%=0.036wt%, the balance is Fe .

[0027] Smelting process: Vacuum smelting in an electromagnetic induction furnace, filled with argon for protection, and cast into a 90mm slab.

[0028] Rolling process: the heating temperature of the steel material is 1200°C, and the heat preservation is 3 hours for homogenization treatment. Hot rolled on a 350 two-roll hot rolling mill to obtain a hot-rolled sheet with a thickness of about 3.5mm and a total deformation of 95%. / s), can obtain tensile strength 1001MPa, yield strength 535MPa, while elongation reaches 52% hot-rolled sheet.

Embodiment 2

[0030] Steel plates are prepared by traditional vacuum smelting and hot rolling and cold rolling processes

[0031] Smelting process: Vacuum smelting in an electromagnetic induction furnace, filled with argon for protection.

[0032]Rolling process: the heating temperature of the steel material is 1200°C, and the heat preservation is 3 hours for homogenization treatment. Hot rolled on a 350 two-roll hot rolling mill to obtain a hot-rolled sheet with a thickness of about 3mm, with a total deformation of 95%. The starting and finishing temperatures are 1100°C and 950°C respectively. Rolling, cold rolling to a test sheet with a thickness of 1.0 mm, the cold rolling reduction is 66.7%.

[0033] Heat treatment process: 1.0mm thick cold-rolled steel plate is kept in a heating furnace at 700°C for 20 minutes, and then cooled to room temperature at a rate of 10°C / s.

[0034] According to optical microstructure observation, the structure at room temperature is the annealing twins of ...

Embodiment 4

[0040] The difference with Example 1 and Example 2 is: the composition of its steel material is: C%=0.44wt%, Mn%=21.44wt%, Si%=0.10wt%, P%=0.006wt%, S% =0.0055wt%, Al%=0.026wt%, and the balance is Fe. Through the processing of embodiment 1 and example 2,

[0041] Among them, the cold rolling reduction rate is 71.4%, the thickness of the cold rolled sheet is 1.06mm, the heat treatment temperature is 750°C, the temperature is kept for 15min, and the temperature is cooled to room temperature at a speed of 30°C / s.

[0042] Under the conditions of this process, high-strength, high-plastic twin-induced plasticity steel is prepared. The steel material also has a microstructure of annealing twins and stacking faults in the austenite matrix, and its grain size is 2-5 μm. . The yield strength of the steel material at room temperature is 465MPa, the tensile strength is 1040MPa, and the elongation is 61.0%.

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Abstract

The invention belongs to the field of preparing a steel material and in particular relates to a method for preparing a twin crystal induced plastic steel material with high carbon content. The twin crystal induced plastic steel material comprises the following compositions in the range: 0.2 to 0.49weight percent or 0.55 to 1.5weight percent of C, 10 to 22weight percent or 23.1 to 35weight percentof Mn, less than 1weight percent of Al, less than 1weight percent of Si, less than 0.008 percent of S, less than 0.02 percent of P and the balance being Fe and inevitable impurities. The preparation method comprises the following steps: a plate blank prepared through smelting is subjected to a hot rolling process to obtain a hot rolled sheet in a use state; or the plate blank is subjected to hot rolling and cold rolling to obtain a cold rolled sheet; the sheet is subjected to heat treatment in order that the tensile strength is between 750 and 1,200 MPa, the yield strength is between 230 and 615 MPa, the extension rate is between 45 and 70 percent; and no tough brittle turning point exists at a temperature of more than 100 DEG C. The steel material with high strength and high plasticity has excellent comprehensive mechanical performance, machining performance and forming performance, can be used for a steel rail of a railroad, automobile manufacture, engineering machinery, an oil and gas transportation pipeline, a liquefied natural gas transportation ship, war industry and other industries and has important value and great application space for an automobile industry and a war industry with rapid development.

Description

technical field [0001] The invention belongs to the field of iron and steel material preparation, and relates to a method for preparing a twin-induced plastic iron and steel material with high carbon content. Background technique [0002] In the 21st century, the rapid development of light-weight and energy-saving vehicles, deep well oil production pipes and large-diameter oil (gas) pipes, large-scale construction machinery, long-span heavy-duty bridges, large-scale high-performance ships and high-rise buildings, etc., is especially important for my country's key development The basic railway transportation business puts forward higher requirements on the performance and service life of steel materials. At the same time, the competition in the steel industry is escalating day by day, and the requirements of users are also constantly improving. All these problems are posing serious challenges to the sustainable and stable development of the steel industry. Therefore, relying...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06B21B37/74B21B37/16C21D8/02C21D9/52
Inventor 米振莉唐荻江海涛代永娟吕建崇
Owner UNIV OF SCI & TECH BEIJING
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