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A low-cost normalizing rolled hot-rolled H-shaped steel and its preparation method

A technology for normalizing rolling and H-beam, which is applied in the field of low-cost normalizing rolling and hot-rolling H-beam and its preparation, can solve the problems of high equipment hazard risk, high production cost, large rolling mill load, etc., and achieves equipment hazard risk. The effect of solving the problem of easy blockage of the nozzle and small risk of equipment damage

Active Publication Date: 2017-07-14
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, mainly by adding Nb and B microalloying, the low temperature of the product is -40°C in the longitudinal direction, and the low temperature impact toughness is not very high. Deoxidation with aluminum is easy to cause blockage of the nozzle in the continuous casting process
[0007] In the above-mentioned patents, the production cost is high, the nozzle is easy to be blocked during the continuous casting process, the heating temperature is high, the cumulative reduction ratio of the finish rolling deformation is relatively large, and the final rolling temperature is low, but it is easy to cause a large load on the rolling mill, and the rolled piece is bent and tilted. , The size is not easy to control, and accidents such as stacking steel are prone to occur during the rolling process, which poses a high risk of harm to equipment, and ultimately leads to a relatively low pass rate of H-beam comprehensive performance and finished product size

Method used

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  • A low-cost normalizing rolled hot-rolled H-shaped steel and its preparation method
  • A low-cost normalizing rolled hot-rolled H-shaped steel and its preparation method
  • A low-cost normalizing rolled hot-rolled H-shaped steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The chemical composition of the control profile is shown in Table 1.

[0033] 1) Converter smelting

[0034] Low sulfur and arsenic-containing blast furnace molten iron is generally required to have sulfur content [S] ≤ 0.02%, arsenic content [S] ≤ 0.0005%, and smelting end point control: [S] < 0.015%, [P] < 0.015%; The pretreated molten iron and high-quality steel scrap are added to the top-bottom combined blowing converter according to the designed ratio. The slag making system adopts the single slag process to reasonably control the basicity of the final slag and the target value of the end point; The process adopts aluminum-manganese-ferro deoxidation alloying, utilizes vanadium-iron and vanadium-nitrogen microalloying, controls target value according to vanadium microalloying alloy, adds vanadium-iron: vanadium-nitrogen=1:3 ratio, vanadium-iron and vanadium-nitrogen alloy in molten steel Add to 1 / 4 of the output, add to 3 / 4 of the output, and control the alkalinity ...

Embodiment 2

[0051] The chemical composition of the control profile is shown in Table 1.

[0052] 1) Converter smelting

[0053] Low sulfur and arsenic-containing blast furnace molten iron is generally required to have sulfur content [S] ≤ 0.02%, arsenic content [S] ≤ 0.0005%, and smelting end point control: [S] < 0.015%, [P] < 0.015%; The pretreated molten iron and high-quality steel scrap are added to the top-bottom combined blowing converter according to the designed ratio. The slag making system adopts the single slag process to reasonably control the basicity of the final slag and the target value of the end point; The process adopts aluminum-manganese-ferro deoxidation alloying, utilizes vanadium-iron and vanadium-nitrogen microalloying, controls target value according to vanadium microalloying alloy, adds vanadium-iron: vanadium-nitrogen=1:3 ratio, vanadium-iron and vanadium-nitrogen alloy in molten steel Add to 1 / 4 of the output, add to 3 / 4 of the output, and control the final rol...

Embodiment 3

[0065] The chemical composition of the control profile is shown in Table 1.

[0066] 1) Converter smelting

[0067] Low sulfur and arsenic-containing blast furnace molten iron is generally required to have sulfur content [S] ≤ 0.02%, arsenic content [S] ≤ 0.0005%, and smelting end point control: [S] < 0.015%, [P] < 0.015%; The pretreated molten iron and high-quality steel scrap are added to the top-bottom combined blowing converter according to the designed ratio. The slag making system adopts the single slag process to reasonably control the basicity of the final slag and the target value of the end point; The process adopts aluminum-manganese-ferro deoxidation alloying, uses vanadium-iron and vanadium-nitrogen microalloying, controls the target value according to the vanadium microalloying alloy, adds vanadium-iron: vanadium-nitrogen=1:3 ratio, vanadium-iron and vanadium-nitrogen alloy in molten steel Add to 1 / 4 of the output, add to 3 / 4 of the output, and control the final...

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Abstract

The invention relates to a low-cost normalizing rolled hot-rolled H-shaped steel and a preparation method thereof, belonging to the technical field of metallurgy and rolling. The chemical composition of the H-shaped steel according to the present invention is (%) by weight percentage: C: 0.04-0.15, Si: 0.15-0.50, Mn: 0.95-1.65, P≤0.020, S≤0.015, Al: 0.02-0.050, Cu ≤0.55, Cr≤0.30, Ni≤0.50, Mo≤0.10, B≤0.03, V: 0.02~0.060, As+Sn+P+S≤0.04, the rest are Fe and unavoidable impurities. The steel production process is as follows: hot metal pretreatment—converter smelting—LF refining—rectangular billet continuous casting—heating—high pressure water descaling—rolling and cooling—straightening—sawing to length—collecting and stacking. The product of the invention has the characteristics of low production cost, high strength, good low-temperature toughness, excellent welding performance, etc., and meets the current application requirements of hot-rolled H-shaped steel materials used in extremely cold regions, LNG projects, and offshore oil platform projects.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a low-cost normalizing rolled hot-rolled H-shaped steel and a preparation method thereof. Background technique [0002] As a good economical material, H-shaped steel is widely used in high-rise buildings, airports, chemical and oil and gas industries. The Arctic is rich in oil and natural gas resources, and the number of resource development projects in this region will increase significantly, and the demand for extremely low temperature resistant steel will also increase significantly. At the same time, with the opening of the Arctic shipping route, the shipping time of the existing Suez Canal has been shortened by more than 10 days, which has also accelerated the shipbuilding industry's demand for extremely low temperature resistant steel. Because the perennial temperature in this area is below -40°C, more stringent requirements are put forward for the performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/54C22C38/46C22C38/38C22C38/32C22C38/24C22C38/16C22C38/12C21D8/00B22D11/00
Inventor 杜传治方金林武玉利赵培林李超郭秀辉
Owner SHANDONG IRON & STEEL CO LTD
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