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Low-cost normalizing rolling hot rolling H type steel and preparation method thereof

A technology of normalizing rolling and H-shaped steel, which is applied in the field of low-cost normalizing rolling and hot-rolled H-shaped steel and its preparation, which can solve the problems of high risk of equipment hazards, bending and skewing of rolled parts, difficult control of size, and high production costs. problem, to achieve the effect of solving the easy blockage of the nozzle, the high risk of equipment damage, and the small risk of equipment damage

Active Publication Date: 2015-11-04
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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  • Low-cost normalizing rolling hot rolling H type steel and preparation method thereof
  • Low-cost normalizing rolling hot rolling H type steel and preparation method thereof
  • Low-cost normalizing rolling hot rolling H type steel and preparation method thereof

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 low-cost normalizing rolling hot rolling H type steel and a preparation method thereof and belongs to the technical field of metallurgy and rolling. The chemical components of the H type steel comprises, by weight in percentage, 0.04-0.15 of C, 0.15-0.50 of Si, 0.95-1.65 of Mn,, not larger than 0.020 of P, not large than 0.015 of S, 0.02-0.050 of Al, not larger than 0.55 of Cu,, not larger than 0.30 of Cr, not larger than 0.50 of Ni, not larger than 0.10 of Mo, not larger than 0.03 of B, 0.02-0.060 of V, not larger than 0.04 of the sum of As, Sn, P and S and the balanced Fe and inevitable impurities. The production technology process of the steel comprises the steps of pretreatment of molten iron, converter steelmaking, LF refining, rectangular billet caster, heating, high pressure water descaling, rolling and cooling, straightening, sizing saw cutting and collecting and stacking. The low-cost normalizing rolling hot rolling H type steel has the beneficial effects of being low in production cost, high in strength, good in low-temperature toughness, excellent in welding use performance and the like. The low-cost normalizing rolling hot rolling H type steel meets the application requirement of the hot rolling H type steel material for extremely-cold areas, the LNG project and the offshore oil platform project at present.

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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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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