Method for eliminating warped skin on surface of hot alloy steel

A technology of alloy steel and warped skin, which is applied in the field of steelmaking technology, can solve the problem of warped skin on the surface of thermal alloy steel, and achieve the effect of eliminating warped skin defects

Active Publication Date: 2022-04-22
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a method for eliminating surface warping of heat alloy steel to solve the technical problem of surface warping of heat alloy steel during hot rolling

Method used

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  • Method for eliminating warped skin on surface of hot alloy steel
  • Method for eliminating warped skin on surface of hot alloy steel
  • Method for eliminating warped skin on surface of hot alloy steel

Examples

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Embodiment 1

[0057] A method for controlling warped skin defects on the surface of alloy heat series steel. The Si content of the molten iron entering the furnace is 0.25%, the temperature of the molten iron is 1350°C, and the KR slag removal rate is guaranteed to be 96%; the bottom blowing mode of the converter adopts the "full argon blowing" mode , conventional smelting bottom blowing flow rate 1200Nm 3 / h, the nitrogen content after the converter furnace is 25ppm; after the ladle reaches the refining station, the argon blowing time is 3min, and the argon flow rate during the smelting period is 600Nm 3 / h, nitrogen increase of 4ppm in the refining process; continuous casting casting section 1300mm, casting speed 1.4m / min, argon flow rate of ladle casing 25L / min, continuous casting nitrogen increase of 3ppm, nitrogen content of finished steel is 32ppm; slab adopts stack cooling Process, the stack cooling time is 5 hours, the billet temperature after stack cooling is about 560°C, and the f...

Embodiment 2

[0059] A method for controlling warped skin defects on the surface of alloy heat series steel. The Si content of molten iron entering the furnace is 0.30%, the temperature of molten iron is 1360°C, and the KR slag removal rate is guaranteed to be 97%. The bottom blowing mode of the converter adopts the "full argon blowing" mode , the late blowing flow rate of semi-steel smelting converter bottom blowing is 850Nm 3 / h, using slag retention operation, the nitrogen content after the converter furnace is 26ppm; after the ladle reaches the refining station, the argon blowing time is 3.5min, and the argon flow rate during the smelting period is 500Nm 3 / h, nitrogen increase of 5ppm during refining process; continuous casting casting section 1400mm, casting speed 1.3m / min, argon gas flow rate of ladle casing 25L / min, continuous casting nitrogen increase of 2ppm, nitrogen content of finished steel is 33ppm; slab adopts stack cooling Process, the stack cooling time is 6h, the billet te...

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Abstract

The invention relates to the technical field of steelmaking processes, in particular to a method for eliminating surface warping of hot alloy steel. The method comprises the following steps: smelting molten iron in a converter to obtain molten steel after the converter; refining and smelting the molten steel after the furnace to obtain refined molten steel; the refined molten steel is sequentially subjected to continuous casting and stack cooling, and a plate blank is obtained; the nitrogen content of the molten steel after the furnace is less than or equal to 28ppm by mass concentration; the nitrogen increasing amount of the refined molten steel is smaller than or equal to 6 ppm by mass concentration; in the continuous casting process, the nitrogen increasing amount is smaller than or equal to 3 ppm by mass concentration, and the nitrogen content of the plate blank is smaller than or equal to 40 ppm by mass concentration; in the plate blank, a metallographic structure comprises, by volume fraction, 100% of ferrite; and through a low-temperature hot delivery process of nitrogen production content and stack cooling, precipitation of second-phase particles is reduced, austenite is ensured to be completely converted into ferrite, and the defect of warping of a hot-rolled coil is eliminated.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a method for eliminating surface warping of heat alloy steel. Background technique [0002] Wheels, rims, girders and other hot alloy-containing steels are prone to surface warping defects during the hot rolling process, and the defects are distributed on the surface in a "racetrack" shape, which not only has a great impact on product quality, but also easily leads to batch quality. The accident caused a large number of slabs to retreat at the same time, which affected the steel-rolling interface. [0003] The study found that this type of micro-alloyed steel is prone to surface cracks under the conditions of hot delivery and hot charging. At the same time, cracks can be observed on the surface along the direction of the vibration marks or distributed in a network shape, the crack depth is 0.3-2.2 mm, and the maximum width is about 1.5 mm, or the surface warping p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C1/02C21C5/28C21C5/34C21C7/072C21C7/076C21D8/02
CPCC22C33/04C21C1/02C21C5/28C21C5/34C21C7/072C21C7/076C21D8/0226C21D2211/005Y02P10/20
Inventor 张丙龙刘延强李欢李向奎黄宾韩乐乔焕山宋冉杜金磊杨晋赵三元詹美珠沙远洋陈虎周东谨刘浩王章岭赵旭陈守关姜博徐华刘应心田贵昌商艳民刘鸿明
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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