Control method for improving P-center segregation of weathering resistant steel

A control method and technology of weathering steel, applied in the field of iron and steel production, can solve the problems of difficult center segregation control and high cost, and achieve the effect of good quality and improved center segregation

Active Publication Date: 2020-03-27
LIUZHOU IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The embodiment of the present invention provides a control method for improving the P center segregation of weathering steel, which solves the problems of difficult control and high cost of P center segregation in the production of weathering steel by the existing traditional continuous casting and rolling process

Method used

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  • Control method for improving P-center segregation of weathering resistant steel
  • Control method for improving P-center segregation of weathering resistant steel
  • Control method for improving P-center segregation of weathering resistant steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Molten steel S=0.010wt%, P=0.105wt%, the pouring temperature of the tundish is 1551°C, the casting speed is 1.35m / min constant, and the process does not use electromagnetic stirring. The cooling water in the secondary cooling section of continuous casting is: 115L / min for the narrow side of Zone 1, 152L / min for the wide side of Zone 1, 213L / min for the inner and outer arcs of Zone 2, 276L / min for the inner and outer arcs of Zone 3, 35L / min for the inner and outer arcs of Zone 4, 216L / min for inner and outer arcs in zone 5, 102L / min for inner arcs in zone 6, 152L / min for outer arcs in zone 6, 67L / min for inner arcs in zone 7, 100L / min for outer arcs in zone 7, 23L / min for inner arcs in zone 8, and 23L / min for inner arcs in zone 8 The outer arc is 37L / min, the inner arc in zone 9 is 40L / min, the outer arc in zone 9 is 75L / min, the specific water volume is 0.76, and the reduction under light pressure is 4.5mm. Thickness of cast slab hot-rolled rolled steel coil is 4.5mm. ...

Embodiment 2

[0043] The molten steel S=0.003wt%, P=0.106wt%, the pouring temperature of the tundish is 1550°C, the billet casting speed is 1.35m / min constant casting speed, the process does not use electromagnetic stirring, and the cooling water in the secondary cooling section of continuous casting is respectively It is: 142L / min for the narrow side of Zone 1, 210L / min for the wide side of Zone 1, 307L / min for inner and outer arcs in Zone 2, 347L / min for inner and outer arcs in Zone 3, 295L / min for inner and outer arcs in Zone 4, 233L / min for inner and outer arcs in Zone 5, 6 zone inner arc 145L / min, 6 zone outer arc 182L / min, 7 zone inner arc 81L / min, 7 zone outer arc 126L / min, 8 zone inner arc 27L / min, 8 zone outer arc 48L / min, 9 zone The inner arc is 56L / min, the outer arc in zone 9 is 115L / min, the specific water volume is 0.95, the reduction under light reduction is 4.5mm, and the thickness of the hot-rolled rolled steel coil is 4.5mm. The rolled steel coil has a yield strength of 42...

Embodiment 3

[0045] The molten steel S=0.002wt%, P=0.103wt%, the pouring temperature of the tundish is 1552°C, the billet casting speed is 1.45m / min constant casting speed, the process does not use electromagnetic stirring, and the cooling water in the secondary cooling section of continuous casting is respectively It is: 138L / min for the narrow side of Zone 1, 202L / min for the wide side of Zone 1, 304L / min for inner and outer arcs in Zone 2, 342L / min for inner and outer arcs in Zone 3, 282L / min for inner and outer arcs in Zone 4, 226L / min for inner and outer arcs in Zone 5, 6 zone inner arc 137L / min, 6 zone outer arc 179L / min, 7 zone inner arc 80L / min, 7 zone outer arc 124L / min, 8 zone inner arc 26L / min, 8 zone outer arc 42L / min, 9 zone The inner arc is 50L / min, the outer arc in zone 9 is 105L / min, the specific water volume is 0.88, the reduction under light reduction is 4.5mm, and the thickness of the hot-rolled rolled steel coil is 4.5mm. The rolled steel coil has a yield strength of 41...

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Abstract

The embodiment of the invention provides a control method for improving P-center segregation of weathering resistant steel. The control method comprises the following process steps which are sequentially conducted: molten iron smelting of a blast furnace is conducted, molten iron desulfurization pretreatment is conducted, molten steel smelting of a converter is conducted, molten steel refining ofan LF furnace is conducted, continuous casting of a straight-arc-shaped slab casting machine is conducted, hot continuous rolling is conducted, and inspection, packaging and warehousing are conducted,wherein in the step of molten steel smelting of the converter, the molten iron entering the furnace requires that S is less than or equal to 0.015 wt%, the whole process of bottom blowing argon is adopted in the smelting process, the end point of the converter controls that C is 0.04-0.07 wt%, and P is less than or equal to 0.08 wt%. According to the provided control method, the problems of difficult control and high cost in the production of P-center segregation of the weathering resistant steel by an existing traditional continuous casting and rolling technology are solved.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a control method for improving P center segregation of weathering steel. Background technique [0002] In order to make the steel have high weather resistance, a large content of P element will be added to the steel. Although P can increase the strength and hardness of steel, it causes a significant decrease in plasticity and impact toughness. Especially at low temperatures, it makes the steel significantly brittle, a phenomenon known as "cold brittleness". The high content of P in the steel is easy to cause serious P center segregation during the solidification process of the continuous casting slab, which is easy to cause the shear center delamination and cold bending cracking of the steel plate. Affect the use quality of weathering steel plate. [0003] Chinese patent application number 201410591781.6 discloses a weathering steel hot-rolled strip without P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/072B22D11/22C21C7/00
CPCB22D11/225C21C7/0006C21C7/064C21C7/072
Inventor 李宗强邓深李源源樊雷杨跃标张金旺袁勤攀钱学海梁龙清
Owner LIUZHOU IRON & STEEL
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