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A 460mpa grade bridge steel plate and its manufacturing method

A 460mpa, steel plate technology, applied in the field of iron-based alloy smelting, can solve the problems that the steel plate does not have atmospheric corrosion resistance, impact toughness only reaches E level, and affects the welding performance of the steel plate, achieving excellent atmospheric corrosion resistance and low production cost , the effect of high toughness

Active Publication Date: 2022-07-26
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the C content is too high (0.13% to 0.16% by weight), which affects the welding performance of the steel plate to a certain extent. The steel plate does not have atmospheric corrosion resistance, and the production thickness is only 20mm to 68mm. -40℃)
The disadvantage is that the steel plate does not have atmospheric corrosion resistance, the production thickness is ≤50mm, and the impact toughness only reaches E grade (-40°C)
[0005] Chinese patent publication CN101318287A discloses a production method of 460MPa high-strength and toughness medium-thick steel plate for bridges, low C component design (0.07% ~ 0.10%), yield strength ≥ 460MPa, tensile strength ≥ 570MPa, yield ratio ≤ 0.83, Elongation after fracture ≥ 20%, toughness at -40°C low temperature ≥ 100J, produced by controlled rolling and controlled cooling process, the disadvantage is that the steel plate does not have atmospheric corrosion resistance, production thickness ≤ 30mm, impact toughness only reaches E level (-40°C )

Method used

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  • A 460mpa grade bridge steel plate and its manufacturing method
  • A 460mpa grade bridge steel plate and its manufacturing method
  • A 460mpa grade bridge steel plate and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The thickness of the steel plate in this example is 6 mm. It is smelted from the following components by mass percentage: C: 0.06%, Si: 0.10%, Mn: 1.38%, P: 0.012%, S: 0.003, Cr: 0.48%, Cu: 0.30%, Ni: 0.31 %, Als: 0.029, Nb: 0.027, V: 0.035%, Ti: 0.015%, Mo: 0.04%, N: 0.0032, B: 0.0002%, Ce: 0.003%, Pcm: 0.18, atmospheric corrosion resistance index 6.2, more The amount is Fe and inevitable impurities.

[0062] The steps of the production method of the 460MPa grade atmospheric corrosion resistant low yield ratio bridge steel plate of the present embodiment are as follows:

[0063] In the first step, steelmaking, blast furnace molten iron is pretreated by KR to desulfurize to 0.005%; BOF converter initial smelting decarburization and dephosphorization reach the carbon content of 0.05% and phosphorus content respectively to 0.05% and phosphorus content to tap steel; LF refining completes the depth of molten steel Deoxidation, fine adjustment of various components to meet...

Embodiment 2

[0074]The thickness of the steel plate in this example is 60 mm. It is smelted from the following components by mass percentage: C: 0.07%, Si: 0.21%, Mn: 1.61%, P: 0.009%, S: 0.001, Cr: 0.57%, Cu: 0.33%, Ni: 0.39 %, Als: 0.041, Nb: 0.039, V: 0.045%, Ti: 0.022%, Mo: 0.12%, N: 0.0027, B: 0.0003%, Ce: 0.002%, Pcm: 0.22, atmospheric corrosion resistance index 6.6, more The amount is Fe and inevitable impurities.

[0075] The steps of the production method of the 460MPa grade atmospheric corrosion resistant low yield ratio bridge steel plate of the present embodiment are as follows:

[0076] In the first step, steelmaking, blast furnace molten iron is pretreated by KR to remove sulfur to 0.004%; BOF converter primary smelting decarburization and dephosphorization reach the carbon content of 0.04% and phosphorus content respectively to 0.04% and phosphorus content to tap steel; LF refining completes the molten steel depth Deoxidation, fine adjustment of various components to meet ...

Embodiment 3

[0087] The thickness of the steel plate in this example is 100 mm. It is smelted from the following components by mass percentage: C: 0.05%, Si: 0.14%, Mn: 1.67%, P: 0.008%, S: 0.001, Cr: 0.69%, Cu: 0.32%, Ni: 0.45 %, Als: 0.039, Nb: 0.045, V: 0.050%, Ti: 0.023%, Mo: 0.19%, N: 0.0025, B: 0.0002%, Ce: 0.003%, Pcm: 0.21, atmospheric corrosion resistance index 6.7, more The amount is Fe and inevitable impurities.

[0088] The steps of the production method of the 460MPa grade atmospheric corrosion resistant low yield ratio bridge steel plate of the present embodiment are as follows:

[0089] In the first step, steelmaking, blast furnace molten iron is pretreated by KR to remove sulfur to 0.003%; BOF converter initial smelting decarburization and dephosphorization reach the carbon content of 0.04% and phosphorus content respectively to 0.04% and phosphorus content to tap steel; LF refining completes the depth of molten steel Deoxidation, fine adjustment of various components to ...

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Abstract

The invention relates to a 460MPa grade bridge steel plate and a manufacturing method thereof, belonging to the field of metallurgical manufacturing of steel materials for bridge steel structures. The production method of the steel plate is as follows: through KR molten iron pretreatment, BOF converter primary refining, LF refining, RH vacuum treatment, arc continuous casting machine to produce continuous casting slab, continuous casting slab is reheated, controlled rolling, accelerated cooling The microstructure and the structure type of the steel plate are controlled. The ultra-low carbon composition design is adopted. The thickness of the near surface of the steel plate is 0~5mm, which is a mixture of lath-shaped carbon-free bainite and quasi-polygonal ferrite, and the middle thickness is lath-shaped ultra-low carbon bainite and quasi-polygonal ferrite. A mixed structure of solid and a small amount of granular bainite. The production thickness of steel plate is 5~100mm, Rp0.2≥460MPa, Rm590MPa~700MPa, A≥20%, ‑60℃ vertical and horizontal KV2≥120J, with high strength, high toughness, excellent atmospheric corrosion resistance, excellent welding performance and other advantages, It can be widely used in the construction of large and extra large bridge steel structures.

Description

technical field [0001] The invention belongs to the technical field of iron-based alloy smelting, in particular to a 460MPa grade atmospheric corrosion-resistant steel plate used for the manufacture of large and extra-large bridge steel structures, and also relates to a manufacturing method of the steel plate. Background technique [0002] Bridge construction is gradually developing in the direction of large span and heavy load. The steel structures used to manufacture bridges are getting larger and larger, and the strength requirements of steel plates used for making bridge steel structures are getting higher and higher. The yield strength of 460MPa steel plates has gradually become large and extra large bridges The main material for making steel structures. As an all-welded structure, the welding performance of bridge structural steel is extremely important to bridge safety and construction. For contemporary large and extra-large bridges, atmospheric corrosion-resistant s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C21D6/00C21D8/02C22C33/04
CPCC22C38/004C22C38/02C22C38/04C22C38/58C22C38/42C22C38/06C22C38/48C22C38/46C22C38/50C22C38/44C22C38/54C22C38/005C22C33/04C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0221C21D2211/002C21D2211/005
Inventor 李红文罗元东许晓红白云苗丕峰林涛孙宪进刘海英马菁
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD