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A kind of smelting method of nitrogen-containing low temperature steel p460nl2

A smelting method and low-temperature steel technology, applied in the field of metallurgy, can solve problems such as poor control of nitrogen content, and achieve the effects of improving the quality of continuous casting slabs, simple operation, and excellent steel quality

Active Publication Date: 2020-11-03
舞阳新宽厚钢板有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The steel used for tank car body materials has high requirements on internal quality. During product design, the VN compound composed of V and N is mainly used to refine the structure and improve the strength and toughness of the steel plate. The N blowing process is the core part of smelting molten steel. Nitrogen The accuracy of content control is difficult to grasp, and the steel used for tank car body materials has stricter requirements on the purity of molten steel

Method used

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  • A kind of smelting method of nitrogen-containing low temperature steel p460nl2
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  • A kind of smelting method of nitrogen-containing low temperature steel p460nl2

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Embodiment 1

[0032] The thickness of the present embodiment nitrogen-containing low-temperature steel P460NL2 is 10mm, and its smelting method comprises the following steps:

[0033] (1) Smelting: After the initial smelting, the molten steel is sent to the LF furnace for pre-dephosphorization and slag dumping, and then sent to the LF furnace for refining and desulfurization, feeding Al wire 350m / t steel, white slag retention time 55min, lime dosage 16kg / t steel, Process and slag removal [Al]: 0.010%; during LF refining, when the S content of molten steel is 0.003%, the bottom blowing gas is changed from argon to nitrogen, and when nitrogen is replaced online, the pressure is first raised to 0.1kg / L, quickly replace the joint after removing the ladle, nitrogen blowing time is 26min, nitrogen flow rate is 80L / min;

[0034] After the refining is completed, vacuum treatment is carried out in the VD furnace. Before the vacuum degassing treatment in the VD furnace, 65kg / t of steel is added to t...

Embodiment 2

[0040] The thickness of the present embodiment nitrogen-containing low temperature steel P460NL2 is 13mm, and its smelting method comprises the following steps:

[0041] (1) Smelting: After initial smelting, molten steel is sent to LF furnace for pre-dephosphorization and slag dumping, and then sent to LF furnace for refining and desulfurization, feeding Al wire 400m / t steel, white slag retention time 50min, lime dosage 18kg / t steel, Process and slag removal [Al]: 0.012%; during LF refining, when the S content of molten steel is 0.005%, the bottom blowing gas is changed from argon to nitrogen, and when the nitrogen is replaced online, the pressure is first raised to 0.1kg / L, quickly replace the joint after removing the ladle, nitrogen blowing time is 20min, nitrogen flow rate is 90L / min;

[0042] Vacuum treatment in the VD furnace after refining, before the vacuum degassing treatment in the VD furnace, add CaSi block 70kg / t steel; vacuum degree 60Pa, vacuum holding time 20min...

Embodiment 3

[0048] The thickness of present embodiment nitrogen-containing low-temperature steel P460NL2 is 16mm, and its smelting method comprises the following steps:

[0049] (1) Smelting: After initial smelting, molten steel is sent to LF furnace for pre-dephosphorization and slag dumping, and then sent to LF furnace for refining and desulfurization, feeding Al wire 400m / t steel, white slag retention time 60min, lime dosage 20kg / t steel, Process and slag removal [Al]: 0.015%; during LF refining, when the S content of molten steel is 0.004%, the bottom blowing gas is changed from argon to nitrogen, and when nitrogen is replaced online, the pressure is first raised to 0.1kg / L, quickly replace the joint after removing the ladle, nitrogen blowing time is 30min, nitrogen flow rate is 90L / min;

[0050] After the refining is completed, vacuum treatment is carried out in the VD furnace. Before the vacuum degassing treatment in the VD furnace, 80kg / t of steel is added to the CaSi block; Afte...

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Abstract

The invention discloses a smelting method of nitrogen-contained low-temperature steel P460NL2. The smelting method comprises the following steps: (1) smelting: molten steel is primarily smelted to feed in a LF furnace for pre-dephosphorization and slag pouring, and are fed in the LF furnace for refining and vacuum treatment in a crane ladle VD furnace; (2) casting: the casting is performed after the vacuum breakage; and (3) steel blank stacking and slow cooling: after steel blanks are cast, cut steel blanks are immediately stacked and slowly cooled to the room temperature. Higher-cost compoundraw materials containing N have no need to be added, so that the economical benefit is excellent; the operation is simple, and special nitrogen adding equipment is not needed; all the components canmeet the inner quality standard, in particular, the N content; the steel is high in quality; the sulfur print of the steel blanks reaches the grade C above 1.0; the flaw detection of the steel blankscan reach above Se1072-97III grade; the lowest flaw detection of steel plates can reach above JB / T4730.3-2005II grade; and the tensile strength of P460NL2 steel is not lower than 630 MPa.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting nitrogen-containing low-temperature steel P460NL2. Background technique [0002] At present, in China, the tank body materials of tank trucks are almost all made of low-strength 16MnR steel, resulting in thicker tank wall thickness, large self-weight coefficient, small volume-to-weight ratio and low carrying efficiency of tank trucks. However, the steel for foreign tanker tanks generally adopts normalized low-alloy steel with a tensile strength of 550-600MPa. efficiency. [0003] The steel used for tank car body materials has high requirements on internal quality. During product design, the VN compound composed of V and N is mainly used to refine the structure and improve the strength and toughness of the steel plate. The N blowing process is the core part of smelting molten steel. Nitrogen The accuracy of content control is not easy to gras...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/064C21C7/10B22D11/16
Inventor 李杰龙杰刘丹付冬阳付振坡袁平赵晓辉王全胜彭世宝赵向政刘德胜
Owner 舞阳新宽厚钢板有限责任公司
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