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Heat treatment method

A heat treatment method and slab technology, applied in the field of heat treatment, to achieve the effect of excellent surface quality and elimination of internal stress

Inactive Publication Date: 2015-02-25
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the above-mentioned shortcomings of existing heat treatment methods, the present invention provides a heat treatment method for medium and high carbon steel continuous casting slabs that eliminates slab crack defects. Demand for hot-rolled strips produced from slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] What the heat treatment of present embodiment is medium-high carbon steel slab, its chemical composition mass percent is:

[0037] C: 1.10%; Si: 0.30%; Mn: 0.40%; P: 0.025%; S: 0.021%;

[0038] The balance is Fe and unavoidable impurity elements.

[0039] The slab is 11000mm long, 1250mm wide and 230mm thick.

[0040] The heat treatment process of the present embodiment is:

[0041] The temperature before the slab enters the heat treatment furnace: 600°C;

[0042] Slab heat treatment holding temperature: 740°C;

[0043] Slab heat treatment holding time: 6 hours;

[0044] Slab heat treatment temperature before leaving the furnace: 250°C;

[0045] Slab heat treatment heating rate: 30°C / h;

[0046] Slab heat treatment cooling rate: 40°C / h.

Embodiment 2

[0048] What the heat treatment of present embodiment is medium-high carbon steel slab, its chemical composition mass percent is:

[0049] C: 0.85%; Si: 0.30%; Mn: 0.37%; P: 0.018%; S: 0.012%;

[0050] The balance is Fe and unavoidable impurity elements.

[0051] The slab is 11000mm long, 1250mm wide and 200mm thick.

[0052] The heat treatment process of the present embodiment is:

[0053] The temperature before the slab enters the heat treatment furnace: 550°C;

[0054] Slab heat treatment temperature: 720°C;

[0055] Slab heat treatment holding time: 8 hours;

[0056] Slab heat treatment temperature before leaving the furnace: 300°C;

[0057] Slab heat treatment heating rate: 40°C / h;

[0058] Slab heat treatment cooling rate: 60°C / h.

Embodiment 3

[0060] What the heat treatment of present embodiment is medium-high carbon steel slab, its chemical composition mass percent is:

[0061] C: 0.65%; Si: 0.22%; Mn: 0.35%; P: 0.017%; S: 0.013%;

[0062] The balance is Fe and unavoidable impurity elements.

[0063] The slab is 11000mm long, 1450mm wide and 230mm thick.

[0064] The heat treatment process of the present embodiment is:

[0065] The temperature before the slab enters the heat treatment furnace: 300°C;

[0066] Slab heat treatment temperature: 500°C;

[0067] Slab heat treatment holding time: 30 hours;

[0068] Slab heat treatment temperature before leaving the furnace: 200°C;

[0069] Slab heat treatment heating rate: 80°C / h;

[0070] Slab heat treatment cooling rate: 90°C / h.

[0071] Carbon steel embodiment four

[0072] What the heat treatment of present embodiment is medium-high carbon steel slab, its chemical composition mass percent is:

[0073] C: 0.50%; Si: 0.32%; Mn: 0.70%; P: 0.016%; S: 0.014%;

...

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Abstract

A related heat treatment method is characterized in that heat treatment is performed on a medium / high-carbon steel continuous cast slab and a medium / high-carbon alloy steel continuous cast slab. The medium / high-carbon steel continuous cast slab comprises, in percent by mass, 0.25-1.35% of C, 0.10-0.37% of Si, 0.25-0.80% of Mn, P <=0.035%, and S <=0.030%. The medium / high-carbon alloy steel continuous cast slab comprises, in percent by mass, 0.25-1.50% of C, 0.10-2.10% of Si, 0.30-2.60% of Mn, P <=0.035%, S <=0.035%, Cr <=4.50%, V <=1.20%, Mo <=1.20%, Ni <=4.60%, and B <=0.004%. The heat treatment steps comprise that the temperature of the slab entering a heat treatment furnace is 150 DEG C-850 DEG C, the slab heat-treatment warm-keeping temperature is 300-850 DEG C, the slab heat-treatment warm-keeping time is 3-40 hours, the temperature of the slab exhausted from the furnace after being subjected to heat treatment is 150-550 DEG C, the slab heat-treatment heating speed is 5-250 DEG C / h, and the slab heat-treatment cooling speed is 5-100 DEG C / h. The continuous cast slabs subjected to heat treatment does not have crack defects.

Description

technical field [0001] The present invention relates to a heat treatment method. technical background [0002] Existing heat treatment methods are used in production to eliminate defects in cast and forged parts. There is no relevant report on the heat treatment method for continuous casting of medium-high carbon steel and continuous casting of medium-high carbon alloy steel. [0003] Carbon steel mainly refers to the fact that the mechanical properties depend on the carbon content in the steel. According to the carbon content, carbon steel can be divided into low carbon steel (W C ≤ 0.25%), medium carbon steel (W C : 0.25%—0.6%) and high carbon steel (W C ≥ 0.6%). [0004] Generally, the higher the carbon content in carbon steel, the higher the hardness and the higher the strength, but the lower the plasticity. High carbon steel has a carbon content from 0.60% to 1.70% and can be hardened and tempered. Generally, high-carbon steel has high strength and is widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/30C21D6/00C22C38/04C22C38/58C22C38/54C22C38/46C22C38/44C22C38/40C22C38/38C22C38/34C22C38/32C22C38/24C22C38/22C22C38/18
Inventor 胡松涛王育田薛文广边育秀孟传峰
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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