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Producing method of hot rolled round steel used for high-rise building structure

A high-rise building and production method technology, applied in the field of metallurgy, can solve the problems that there are no reports of high-rise building structures using round steel, achieve good yield ratio, improve production efficiency, and do not increase investment and production costs.

Inactive Publication Date: 2018-10-19
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, Q345GJC steel plate for high-rise building structure has been developed in the world, but there is no report of round steel for high-rise building structure.
China has a mass production of smooth disc steel bars below 25mm, and HPB300 with a yield strength of 300Mpa; there is development of steel plate Q345GJC for high-rise building structures, but there is no supporting round steel for high-rise buildings with a yield strength of 345Mpa. to develop

Method used

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  • Producing method of hot rolled round steel used for high-rise building structure
  • Producing method of hot rolled round steel used for high-rise building structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for producing hot-rolled round steel for high-rise building structures. The composition weight percentage of steel is: C=0.16, Si=0.37, Mn=1.52, P=0.015, S=0.002, Al=0.029, CEV=0.43, and the rest For Fe and unavoidable impurities. Key process steps include:

[0028] Converter smelting: end point C: 0.08%, P: 0.013%; blowing times after high-strength supplementary blowing is 1 time; alloy is added to the ladle when tapping 1 / 4;

[0029] LF furnace: the molten steel is energized in the LF furnace for 28 minutes, and the total argon blowing time is 52 minutes; the molten steel is fed with Ca wire for 180 meters before leaving the station.

[0030] VD furnace: the total argon blowing time in the VD furnace is 50 minutes; the vacuum time is 15 minutes, and the soft argon blowing time after breaking the air is 18 minutes; set [H] 1.2ppm;

[0031] Continuous casting: superheat 20℃~21℃, casting speed 0.65m / min, billet size: 300*340*mm*6m;

[0032] Heating: the bille...

Embodiment 2

[0037] A production method of hot-rolled round steel for high-rise building structures, the composition weight percentage of steel is C=0.17, Si=0.37, Mn=1.55, P=0.021, S=0.002, Al=0.029, CEV=0.44, and the rest are Fe and unavoidable impurities; key process steps include:

[0038] Converter smelting: end point C: 0.10%, P: 0.017%; blowing times after high-draw blowing is 1 time, and alloy is added to the ladle when 1 / 4 of the steel is tapped;

[0039] LF furnace: The molten steel is energized in the LF furnace for 28 minutes, and the total argon blowing time is 68 minutes; the molten steel is fed with Ca wire for 200 meters before leaving the station.

[0040] Continuous casting: superheat 30℃~33℃, casting speed 0.70~080m / min, billet size: 240*240*mm*6m;

[0041] Heating: the billet heating temperature is between 1180 and 1200 ℃, and the time in the furnace is 150 minutes;

[0042] Rolling: Two-stage rolling is adopted, the first stage is billet rolling, and the second stage...

example 3

[0046]A production method of hot-rolled round steel for high-rise building structures, the composition weight percentage of steel is C=0.17, Si=0.40, Mn=1.49, P=0.019, S=0.004, Al=0.032, CEV=0.43, and the rest are Fe and unavoidable impurities; key process steps include:

[0047] Converter smelting: end point C: 0.09%, P: 0.017%; blowing times after high-strength supplementary blowing is 1 time, and alloy is added to the ladle when tapping 1 / 4;

[0048] LF furnace: The molten steel is energized in the LF furnace for 22 minutes, and the total argon blowing time is 47 minutes; the molten steel is fed with Ca wire for 200 meters before leaving the station.

[0049] Continuous casting: superheat 27℃~31℃, casting speed 1.60~1.70m / min, billet size: 150*150*mm*12m;

[0050] Heating: the billet heating temperature is between 1020 and 1100°C, and the time in the furnace is 120min;

[0051] Rolling: Start rolling at 1010°C, after roughing, intermediate rolling and continuous rolling, ...

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Abstract

The invention discloses a producing method of hot rolled round steel used for a high-rise building structure. The composition weight percentage of the steel is 0.12-0.18 % of C, 0.25-0.50% of Si, 1.20-1.70% of Mn, no more than 0.025% of P, no more than 0.015% of S, no less than 0.020% of Al, 0.41-0.45% of carbon equivalent, and the balance Fe and unavoidable impurities; the key process steps include smelting, LF furnace forging, VD furnace forging, continuous casting, heating, rolling, and cooling; the tensile strength of the produced steel is at 470-630 Mpa, the yield strength is at 315-455 Mpa, the yield ratio is below 0.80, the elongation rate is above 22%, and the welding crack sensitivity coefficient is below 0.28%, the impact Akv at minus 20 DEG C is above 47 J. The hot rolled roundsteel used for the high-rise building structure has high strength, high yield ratio, elongating performance, low temperature impact performance, welding performance, seismic performance and the like and can well meet the using demands of the seismic, refractory, welding performances of the hot rolled round steel of various high-rise building structures.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a production method of hot-rolled round steel (Q345GJC) for high-rise building structures. technical background [0002] With the advancement of construction technology, especially the continuous renewal of building heights, the requirements for building materials have been further improved. In addition to good earthquake resistance and fire resistance, hot-rolled round steel for high-rise building structures must also have good welding performance. , with high strength, good elongation and high impact toughness including low temperature impact toughness. [0003] At present, the steel plate Q345GJC for high-rise building structure is developed in the world, but there is no report of round steel for high-rise building structure. China has a mass production of smooth disc steel bars below 25mm, and HPB300 with a yield strength of 300Mpa; there is development of steel plate Q345GJ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/068C21C7/10C22C38/02C22C38/04C22C38/06C22C33/04B21C37/04
CPCC21C7/06B21C37/04C21C7/068C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06
Inventor 徐瑞军李建宇汤伟田志国罗登蒋凌枫黄振华
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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