Method for Improving the Surface Quality of High-Strength Weather-resistant H-beam Steel

A surface quality, H-shaped steel technology, applied in the field of metallurgical continuous casting, can solve the problems of easy cracks in the web, affect the surface quality, uneven cooling, etc., and achieve the effect of reducing the longitudinal cracking of the web of weathering steel

Active Publication Date: 2020-01-31
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

The weather-resistant H-beam special-shaped continuous casting slab has complex cross-section, large specific surface area, uneven cooling, and large strain force. In addition to the characteristics of weather-resistant steel itself, cracks are prone to occur inside the web, which affects the surface quality.

Method used

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  • Method for Improving the Surface Quality of High-Strength Weather-resistant H-beam Steel
  • Method for Improving the Surface Quality of High-Strength Weather-resistant H-beam Steel

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Embodiment Construction

[0013] The technical solutions of the present invention will be described in detail below with reference to exemplary implementations. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

[0014] Continuous casting process of shaped billet: hot metal desulfurization by KR method → ​​90t top-bottom compound blowing converter → 100t LF refining furnace → ladle rotary table → tundish → crystallizer → sector section secondary cooling zone → drawing straightener → flame cutting → output roller table → Walking cooling bed → Slab sent to rolling steel heating furnace → Rolling mill → Straightening → Cooling.

[0015] The invention adopts a high-speed weak cooling process, and according to the characteristics of the molten s...

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Abstract

The invention discloses a method for improving the surface quality of high-strength and weather-resisting H-shaped steel. In a profiled blank continuous casting process, the straightening temperature of a casting blank is 830 DEG C to 900 DEG C and a crack-sensitive area is avoided; a drawing speed of a casting machine is controlled to be 0.90min to 1.10min; the specific water flow of secondary cooling is 0.7L / kg to 0.8L / kg; the water quantity of a crystallizer is 4100L / min; the water feeding temperature of the crystallizer is 25 DEG C to 30 DEG C and the arc-alignment centering of the crystallizer is less than or equal to 100mum; the superheating temperature of tundish molten steel is 20 DEG C to 25 DEG C and has covering slag low alkalinity and high viscosity; double-water-gap and all-shield casting is adopted, and the immersion depth of water caps is 70mm to 80mm; a connecting part of the long water gap and a large ladle is sealed with argon gas after continuous casting is finished, stacking and slow cooling are carried out on the casting blank for more than or equal to 24h. By adopting the method disclosed by the invention, the surface quality problem of a weather-resisting H-shaped steel profiled continuous casting blank is solved, and the profiled continuous casting blank with qualified quality can be obtained.

Description

technical field [0001] The invention relates to a metallurgical continuous casting technology, in particular to a method for improving the surface quality of high-strength weather-resistant H-shaped steel. Background technique [0002] Compared with Q235B or Q345B ordinary carbon steel, high-strength weather-resistant H-shaped steel has excellent properties such as high strength, atmospheric corrosion resistance, and welding, and is widely used in offshore platforms, transmission towers, railway bridges and other fields. It adds a certain amount of alloying elements (Cu, P, Cr, Ni, etc.) to ordinary steel smelting, and its corrosion resistance is 2-8 times that of ordinary carbon steel. The demand for H-beams will increase, and the quality requirements for steel will also be higher and higher, and the later maintenance costs of high-strength and weather-resistant H-beams will be low, the environmental pollution will be small, and the economic benefits of the entire life cycl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/16B22D11/20B22D11/22
CPCB22D11/16B22D11/208B22D11/22
Inventor 孟保仓张怀军刘岩军陈建新张达先
Owner INNER MONGOLIA BAOTOU STEEL UNION
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