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Process for producing super high carbon steel

A technology of ultra-high carbon steel and production process, which is applied in the field of ultra-high carbon steel production process, and can solve problems such as increased energy consumption, high cost, and complicated process

Active Publication Date: 2006-01-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above-mentioned hot extrusion process, due to the need for two-step high, medium temperature forging and large tonnage hot extrusion machine, the problems of increased energy consumption, high cost and too complicated process have not been resolved.
[0010] From this point of view, the ultra-high carbon steel preparation process proposed by Sherby is difficult to achieve large-scale production and popularization and application using existing production methods

Method used

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  • Process for producing super high carbon steel
  • Process for producing super high carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Alloy composition (chemical analysis results, weight %): 1.17C-2.87Si-0.50Mn-1.58Cr-Fe;

[0041] (2) Spray forming to prepare billets

[0042] Put the master alloy material into the induction furnace crucible to melt, the superheat of the melt is about 150°C; the inner diameter of the catheter is φ4mm; the pressure of the atomizing gas (nitrogen) is 2.2MPa, and the distance between the atomizer and the collector substrate is about 360mm, substrate rotation speed is 10rpm; gas / melt flow ratio (G / M) is about 0.30M 3 / kg. Using the above process parameters to prepare a spray-formed billet, this block ultra-high carbon steel billet has excellent original structure (such as figure 1 Shown) so that it has excellent high-temperature deformation ability that general alloy materials do not have, so it can be subjected to large-scale thermal processing;

[0043] (3) Hot rolling of spray-formed blanks

[0044] A 15mm thick bar billet was cut from the spray-formed billet, a...

Embodiment 2

[0048] (1) Alloy composition

[0049] With embodiment 1;

[0050] (2) Spray forming process to prepare billets

[0051] With embodiment 1;

[0052] (3) Hot rolling of spray-formed blanks

[0053] Hot rolling process is with embodiment 1;

[0054] (4) Sheet metal heat treatment after hot rolling

[0055] After hot rolling, the sheet metal is immediately put into a heat treatment furnace whose temperature is set at 750°C for 150 minutes and then taken out for air cooling.

Embodiment 3

[0057] (1) Alloy composition (chemical analysis results, weight %): 1.17C-1.91Si-0.50Mn-1.56Cr-Fe;

[0058] (2) Spray forming process to prepare billets

[0059] With embodiment 1;

[0060] (3) Hot rolling of spray-formed blanks

[0061] Hot rolling process is with embodiment 1;

[0062] (4) Sheet metal heat treatment after hot rolling

[0063] After hot rolling, the sheet metal is immediately put into a heat treatment furnace whose temperature is set at 800°C for 150 minutes and then taken out for air cooling.

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Abstract

The super high carbon steel has the alloy composition of: C 1.0-1.8 wt%, Si 0.5-3.0 wt%, Cr 0.5-2.0 wt% and Mn 0.2-0.7 wt% except Fe. The jet formed super high carbon steel is produced through one deformation and heat treatment combining production process, in which, the jet formed super high carbon steel is maintained inside furnace at 1000 deg.c before taking out for rolling in the single gate reducing degree of 60 %, and the rolled steel is set quickly into heat treatment furnace already reaching the required heat treating temperature and maintained for 150 min before being taken out. The super high carbon steel obtained through the combined production process has special metallurgical structure with pearlite and nodulized structure in proper ratio, tensile strength as high as 1300 MPa, and specific elongation of 18.5 %. The present invention has simple technological process, low power consumption and low production cost.

Description

technical field [0001] The invention relates to a production process of ultra-high carbon steel. Background technique [0002] Due to the high carbon content of ultra-high carbon steel (1.0-2.1wt%), it is difficult to avoid the segregation of carbon and the formation of coarse carbides when prepared by conventional smelting and casting processes; and because the carbon content far exceeds the eutectoid composition, It is also difficult to avoid the formation of coarse carbide networks on austenite grain boundaries during conventional hot working. These defects all lead to fatal brittleness of the material, making it impossible to use in practice. Therefore, the key to the practical application of ultra-high carbon steel as a steel structural material is to improve its strength and toughness. [0003] Aiming at the serious problems in the preparation of ultra-high carbon steel, a group of metallurgists represented by Sherby proposed a series of rather complicated thermomech...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/36C22C33/02B22F3/115C21D8/02
Inventor 史海生樊俊飞林一坚乐海荣彭勇罗光敏
Owner BAOSHAN IRON & STEEL CO LTD
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