Structural steel for bridge and method for manufacturing same

A manufacturing method and technology for structural steel, applied in the field of metallurgy, can solve the problems of high energy consumption in the production process, low impact toughness at low temperature, reduced steel toughness, etc., and achieve the effects of economical design, good corrosion resistance, and good weldability.

Inactive Publication Date: 2010-03-31
ANGANG STEEL CO LTD
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  • Abstract
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Problems solved by technology

[0007] 1. High carbon content reduces the toughness of steel;
[0008] 2. Contains Nb and Ti alloy elements, and the production cost is relatively high;
[0009] 3. The production process consumes a lot of energy and the production pace is low; low temperature impact toughness is low, which reduces the safety of bridges in cold regions

Method used

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[0031] The main feature of the composition of the present invention is that the content of C is relatively low, and precious elements such as Nb and Ti are not added, and the content of its specific chemical composition is as follows (by weight): C0. %, Mn1.20%~1.35%, Cu0.30%~0.45%, Ni0.20%~0.35%, Cr0.30%~0.55%, Mo0.04%~0.07%, V0.02%~0.07%, Al0.02%~0.045%, the rest is Fe and unavoidable impurities.

[0032] The production process of the invention is: converter smelting→LF / VD refining→continuous casting→slab heating→rolling→laminar cooling→stacking and slow cooling→flaw detection→inspection and testing→storage.

[0033] Technological characteristics of the present invention are:

[0034] Steelmaking process: Converter smelting, deep decarburization through top blowing or top-bottom composite blowing, RH or VD vacuum furnace treatment and LF treatment to reduce the harmful effects of harmful gases O, H, N, etc. and S; Micro-alloying, adding iron vanadium before tapping, the am...

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Abstract

The invention discloses structural steel for a bridge and a method for manufacturing same, containing (by weight): 0.04-0.08% of C, 0.25-0.40% of Si, 1.20-1.35% of Mn, 0.30-0.45% of Cu, 0.20-0.35% ofNi, 0.30-0.55% of Cr, 0.04-0.07% of Mo, 0.02-0.07% of V, 0.02-0.45% of Al, and the rest being Fe and unavoidable impurity. The features of the technique are: converter smelting, RH or VD vacuum furnace and LF processing, roll-controlling and cooling-controlling stages, 1150-1200 DEG C of heating temperature, about 850 DEG C of finishing temperature, 350-550 DEG C of final cooling temperature, and5-15 DEG C / s of cooling rate. The steel of the invention has advantages of economy and reasonable design, simple technique, well corrosion resistance and welding performance, and the yield strength can reach 485-595 Mpa.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to structural steel for bridges and a manufacturing method thereof, in particular to structural steel for bridges with yield strength above 485 MPa and a manufacturing method thereof. Background technique [0002] Bridge steel is an important component of bridge construction. With the development of society and economy, the performance requirements of bridge load, earthquake resistance and corrosion resistance are getting higher and higher. Therefore, bridge steel is required not only to have excellent strength and toughness, Good weldability, low yield ratio to ensure the fracture resistance of the bridge under heavy load, and good atmospheric corrosion resistance to improve the service life and safety of the bridge. [0003] At present, the yield strength of bridge steel produced in China is relatively low, such as the "Bridge Structural Steel GB / T 714-2000" standard adopted by mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C21C5/28C21C7/10C21D8/02
Inventor 曹忠孝李文斌马玉璞韩鹏王华李静
Owner ANGANG STEEL CO LTD
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