Manufacturing process for superfine fine steel

A production process and steel technology, applied in the field of ultra-fine steel production technology, can solve the problems of high manufacturing cost of ultra-fine steel, unsuitable for mass production, low product yield, etc. Ease of crafting effect

Inactive Publication Date: 2004-04-21
潘龙修
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some countries have recently reported that 95% of the deformation is used to produce ultra-fine steel with a grain size of 3 μm or more and a tensile strength of 450 mpa. The disadvantages of this fine steel are: large grain size and low tensile strength
Another report uses direct rolling of low-carbon martensite followed by annealing, with a deformation of 50%, to obtain a mixed structure steel with a ferrite grain size of about 1 μm and some residual martensite; the disadvantage of this processing method is that: The hardness of martensite is high, and the plastic deformation process is directly implemented, which is prone to cracking, resulting in low product yield, and the manufacturing cost of ultra-fine stainless steel is high, so it is not suitable for mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The composition of low carbon steel is: C content 0.1%, Si content 0.315%, Mn content 1.01%. Heat a low-carbon steel plate to the austenite range, hold it for a certain period of time and water quench; then hold it at 150°C for a certain period of time for tempering treatment. After tempering, the hardness of the steel is 250-500HV, and then use about 40-80% deformation The ferrite grain size is about 1.2μm, the hardness is about 210HV, and the tensile strength is about 700MPa. stainless steel.

Embodiment 2

[0021] The composition of medium carbon steel is: C content 0.39%, Si content 0.39%, Mn content 1.21%. B content 0.0039%. Heat the medium carbon steel to the austenite temperature range, keep it warm for about 30 minutes, then water quench it, and then temper it in the temperature range of 300-600°C. After tempering, the hardness of the steel is about 300-600HV, and then carry out multiple Pass rolling, the deformation is about 70%, and then annealed in the temperature range of 300-700°C for about 10-60 minutes to obtain ultra-fine steel with a ferrite grain size of about 0.5μm and a hardness of 300HV Around, the tensile strength is 1100Mpa.

Embodiment 3

[0023] Heat the high-carbon steel to the austenite temperature, hold it for about 30 minutes, then quench it with water, and then temper it in the temperature range of 300-700°C. After tempering, the hardness of the steel is in the range of 300-650HV, and then carry out multiple passes Small deformation rolling, when the deformation reaches about 40-70%, and then annealed at 300-600°C for 10-80 minutes, the ferrite grain size is about 0.5μm, the hardness is about 300HV, and the tensile strength can be obtained. Ultra-fine steel with a strength of 1100Mpa.

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Abstract

A technology for producing superfine refined steel includes such steps as tempering the martensitic steel, plastic deforming and annealing to fine the ferrite grains. The resultant steel features high strength and toughness and low cost of production.

Description

technical field [0001] The invention relates to metallurgical technology, and is a production process of superfine refined steel. Background technique [0002] The development of ultra-fine steel is a research subject that all countries attach great importance to. Some countries have recently reported that 95% of the deformation is used to produce ultra-fine steel with a grain size of 3 μm or more and a tensile strength of 450 mpa. The disadvantages of this steel are: large grain size and low tensile strength. Another report uses direct rolling of low-carbon martensite followed by annealing, with a deformation of 50%, to obtain a mixed structure steel with a ferrite grain size of about 1 μm and some residual martensite; the disadvantage of this processing method is that: The hardness of martensite is high, and the plastic deformation process is directly implemented, which is prone to cracking, resulting in low product yield and high manufacturing cost of ultra-fine steel, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
Inventor 潘龙修
Owner 潘龙修
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