Steel solidus-liquidus temperature measurement method

A technology of liquidus temperature and measurement method, which is applied in the field of metal material detection, can solve problems such as the inability to meet actual production needs, and achieve the effect of high degree of automation and good reproducibility

Active Publication Date: 2015-06-24
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the urgent need for the development of special new steel types with narrow solid / liquid temperature ranges (such as Ni-based low-temperature steel, medium manganese steel, and electrical steel, etc.), the traditional calculation models or formulas in the past can no longer meet the actual calculation results of these steel types. production demand

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  • Steel solidus-liquidus temperature measurement method
  • Steel solidus-liquidus temperature measurement method
  • Steel solidus-liquidus temperature measurement method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Measurement of solid and liquidus temperature of 9Ni steel slab:

[0021] (1) Sample preparation: Take a disc-shaped 9Ni steel billet sample with a diameter of 5 mm and a thickness of 0.3 mm to ensure that there is no scale on the surface of the sample, clean it with alcohol solution, and dry it for later use. The main chemical components of 9Ni steel are C: 0.04 wt%, Si: 0.25 wt%, Mn: 0.60 wt%, Ni: 9.0 wt%, Al: 0.035 wt%.

[0022] (2) Select the standard material to complete the calibration of the temperature and sensitivity of the equipment according to the operating procedures of the differential thermal equipment.

[0023] (3) Experimental test: Calculate the liquidus temperature T of the 9Ni steel billet according to the chemical composition L * It is 1503°C, so the maximum heating temperature is set at 1530°C. Set the test program: heat up to 950°C at a rate of 20°C / min, then heat up to 1530°C at a rate of 10°C / min, and then drop to 950°C at a constant cooling ...

Embodiment 2

[0026] Measurement of solid and liquidus temperature of medium manganese steel slab:

[0027] (1) Sample preparation: Take a disc-shaped medium-manganese steel billet sample with a diameter of 4 mm and a thickness of 0.5 mm to ensure that there is no scale on the surface of the sample, clean it with alcohol solution, and dry it for later use. The main chemical components of medium manganese steel are C: 0.1 wt%, Mn: 5 wt%, Al: 1 wt%.

[0028] (2) Select the standard material to complete the calibration of the temperature and sensitivity of the equipment according to the operating procedures of the differential thermal equipment.

[0029] (3) Experimental test: Calculate the liquidus temperature T of the medium manganese steel billet according to the chemical composition L * It is 1506°C, so the maximum heating temperature is set at 1535°C. Set up the test program: heat up to 1535°C at a rate of 10°C / min, then drop to 950°C at a constant cooling rate of 10°C / min. Baseline a...

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Abstract

The invention relates to a steel solidus-liquidus temperature measurement method, and belongs to the technical field of metal material detection. The specific method comprises sample preparation, equipment calibration, experiment testing, and result analysis so as to complete the measurement. The results show that: an extrapolated onset temperature is consistent with a thermodynamic equilibrium temperature, such that a temperature corresponding to an extrapolated onset point of the first endothermic peak on a differential thermal curve during sample heating melting is judged as a liquidus temperature TL, and a temperature corresponding to an extrapolated onset point of the first exothermic peak on a differential thermal curve during sample cooling solidification is judged as a solidus temperature Ts. The measurement method has advantages of rapidness, accuracy, high automation degree, and good reproducibility.

Description

technical field [0001] The invention belongs to the technical field of metal material detection, in particular to a method for measuring the solid-liquidus temperature of steel. It can quickly and accurately measure the solid and liquidus temperature of steel. Background technique [0002] The solidus and liquidus temperatures of steel are important process parameters for determining the pouring temperature and studying the solidification process of molten steel in continuous casting production. As we all know, the pouring temperature of steel = liquidus temperature + superheat of molten steel. However, if the casting temperature is too high, the slab shell will be thin, which will easily cause cracks in the slab, or even breakout, or uncontrolled pouring; if the casting temperature is too low, it will easily cause pouring or freezing. For alloy steel continuous casting, due to different steel types, there are differences in solidification and crystallization. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/12
Inventor 史学星鞠新华刘卫平付百林
Owner SHOUGANG CORPORATION
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