Manufacture method for obtaining superfine crystal grain steel

A manufacturing method and ultra-fine-grained technology, applied in the field of manufacturing ultra-fine-grained steel, can solve the problems of high process control level, long manufacturing process, and high manufacturing cost

Active Publication Date: 2006-03-08
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the patent successfully realizes ultra-fine ferrite grains, the manufacturing process is long, the process is relatively

Method used

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  • Manufacture method for obtaining superfine crystal grain steel
  • Manufacture method for obtaining superfine crystal grain steel

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Experimental program
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Embodiment 1

[0033] The casting temperature of 1# steel is controlled at 1540 ° C. During the casting process, 1.5% of the molten steel weight and 1# steel powder with an average particle size of 65 μm are added to the molten steel. During the adding process, electromagnetic stirring (or mechanical stirring) is continuously used. , control the solidification rate of molten steel at 195°C / min, and after the molten steel is completely solidified, the grain size of the solidified structure of the slab is 13 μm. The process of controlled rolling and strain-induced dynamic phase transformation was carried out on the Gleeble-3800 thermal simulation testing machine. The φ10×25mm sample was heated to 900°C at a heating rate of 18°C / s. The cooling rate is cooled to 800°C for continuous compression deformation, and the pass reduction rate is controlled between 15% and 30%. When the cumulative reduction rate reaches 83%, the specimen is cooled at a cooling rate of 12°C / s to 400℃~500℃, then naturally ...

Embodiment 2

[0035] The casting temperature of 2# steel is controlled at 1540°C. During the casting process, 2# steel powder with 2.0% of the weight of molten steel and an average particle size of 48 μm is added to the molten steel. During the adding process, electromagnetic stirring (or mechanical stirring) is continuously used. , control the solidification rate of molten steel at 185°C / min, and after the molten steel is completely solidified, the grain size of the solidified structure of the slab is 14 μm. The process of controlled rolling and strain-induced dynamic phase transformation was carried out on the Gleeble-3800 thermal simulation testing machine. The φ12×30mm sample was heated to 900°C at a heating rate of 18°C / s. The cooling rate is cooled to 810°C for continuous compression deformation, and the pass reduction rate is controlled between 15% and 30%. When the cumulative reduction rate reaches 85%, the specimen is cooled at a cooling rate of 12°C / s to 400℃~500℃, then naturally ...

Embodiment 3

[0037] The casting temperature of 3# steel is controlled at 1540°C. During the casting process, 1.8% of the molten steel weight and 3# steel powder with an average particle size of 54 μm are added to the molten steel. During the adding process, electromagnetic stirring (or mechanical stirring) is continuously used. , control the solidification rate of the molten steel to 200°C / min, and after the molten steel is completely solidified, the grain size of the solidified structure of the billet is 10 μm. The process of controlled rolling and strain-induced dynamic phase transformation was carried out on the Gleeble-3800 thermal simulation testing machine. The φ15×40mm sample was heated to 900°C at a heating rate of 18°C / s. The cooling rate is cooled to 790°C for continuous compression deformation, and the pass reduction rate is controlled between 15% and 30%. When the cumulative reduction rate reaches 83%, the specimen is cooled at a cooling rate of 12°C / s to 400℃~500℃, then natura...

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Abstract

A manufacturing method for super fine crystal grain steel including the following steps: smelting in terms of the following composition and weight percentage: C0.02~0.20%, Nb 0.01~0.10%, Si 0.80%, Mn1.0~2.0%, Ti0.08~0.025%, Als is not greater than 0.20%, casting: the temperature for pouring is lower than or equal to +20deg.c nucleation agent is added when pouring, the cooling speed of the steel melt is greater than or equal to 180deg.c /min, the strand crystal grain is smaller than 15mum, rolling: heating it to over AC3 then to cool it to about Ar3 to continuously un-re crystallization to control the rolling, the accumulated step-down rate is greater than 80%, cooling: cooling it to below 450deg.C then cooling it naturally to the room temperature to get ferrite crystal grains smaller than 3.0mum.

Description

technical field [0001] The invention relates to a manufacturing method for obtaining ultra-fine ferrite grains in Nb-containing low-carbon low-alloyed steel (low-alloyed steel), and the ferrite grains can be refined to below 3.0 μm. Background technique [0002] As we all know, low-carbon (high-strength) low-alloy steel is one of the most important engineering structural materials, widely used in oil and gas pipelines, offshore platforms, shipbuilding, bridges, pressure vessels, building structures, automobile industry, railway transportation and machinery manufacturing . The properties of low-carbon (high-strength) low-alloy steel depend on its chemical composition and the process system of the manufacturing process, among which strength, toughness and weldability are the most important properties of low-carbon (high-strength) low-alloy steel, which are ultimately determined by the finished steel The state of microstructure, refining the ferrite grain size is the only meas...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 刘自成甘青松
Owner BAOSHAN IRON & STEEL CO LTD
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