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High-strength weathering steel and method of manufacturing same

A production method and technology of weathering steel, applied in rolling mill control device, heat treatment process control, metal rolling, etc., can solve the problems of high carbon content, poor weather resistance, low tensile strength, etc., and achieve excellent low temperature toughness and weather resistance. Good, improve the effect of weather resistance

Inactive Publication Date: 2009-01-28
武钢集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of high carbon content, low-temperature toughness, poor weldability and weather resistance, and low tensile strength in current high-strength structural steels, the present invention provides a steel plate with excellent weather resistance, excellent low-temperature toughness and weldability. High-strength weathering steel with uniform microstructure and mechanical properties in the plate thickness direction and a tensile strength of 690 MPa and its production method, the composition of the steel is designed simply, and the carbon content of the steel is extremely low compared with traditional quenched and tempered high-strength steel , so its microstructure uniformity and mechanical uniformity are better, and the low temperature toughness, weather resistance and welding performance of the steel plate are excellent.

Method used

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  • High-strength weathering steel and method of manufacturing same
  • High-strength weathering steel and method of manufacturing same

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Embodiment 1

[0029] Embodiment 1: According to the composition requirements of the steel of the present invention, the molten iron is pre-desulfurized, and the steel of the present invention is smelted on an 80-ton oxygen top-bottom double-blown converter. After RH vacuum degassing treatment, the whole process of protective continuous casting is adopted; The main chemical composition (smelting analysis) is shown in Table 1 for Invention Steel 1. The steel billet was fully austenitized at 1180°C and rolled out of the furnace, and the starting rolling temperature was 1150°C (the upper limit of the starting rolling temperature is restricted by the austenitizing temperature) ;The starting temperature of finishing rolling is 910℃ and 925℃ respectively, and the ending temperature of finishing rolling is 783℃ and 801℃ respectively (the starting temperature and ending temperature of finishing rolling should not be too low, otherwise the rolling deformation resistance of the steel plate is relatively...

Embodiment 2

[0030] Embodiment 2: According to the composition requirements of the steel of the present invention, pre-desulfurization of molten iron is adopted, and the steel of the present invention is smelted on an 80-ton oxygen top-bottom double-blown converter. After RH vacuum degassing treatment, the whole process of protective continuous casting is adopted; The main chemical composition (smelting analysis) is shown in Table 1 for Invention Steel 2. The steel billet was fully austenitized at 1300°C and rolled out of the furnace, and the starting rolling temperature was 1200°C (the upper limit of the starting rolling temperature is restricted by the austenitizing temperature) ;The starting temperature of finishing rolling is 935℃ and 945℃ respectively, and the finishing temperature of finishing rolling is 807℃ and 815℃ respectively (the starting temperature and ending temperature of finishing rolling should not be too low, otherwise the rolling deformation resistance of the steel plate ...

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Abstract

The invention discloses a high-strength weatherabile steel and manufacturing method in the low-alloy steel making domain, which is characterized by the following: adding low-carbon and Cu-Cr-Ni-Mo-Nb into two or more composite additives; controlling carbon content with maximum solubility in the alpha-Fe at 0.0218% under normal temperature; reducing carbon-permeating evolution; affirming main control tissue evenly.

Description

technical field [0001] The invention relates to a production method of high-strength weather-resistant steel, in particular to a production method of high-strength weather-resistant steel with bainitic structure excellent in low-temperature toughness and welding performance, belonging to the field of low-alloy steel manufacturing. Background technique [0002] Before the present invention, high-strength structural steels of similar strength levels were generally produced by quenching and tempering process, but their carbon content was high, such as 100 and 100W steels in the American Society for Testing and Materials standard ASTMA709 / A709M-01b, which required The carbon content must be greater than or equal to 0.10%, so although the strength is guaranteed, the low temperature toughness, welding performance and weather resistance are poor. In 2004, Anshan Iron and Steel Group Corporation applied for "Bainite Steel with High Tensile Strength, High Toughness and Low Yield Rati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C22C38/50C22C38/58C21C7/072C21C7/10C21D8/00C21D1/18C21D11/00B21B37/00
Inventor 郭爱民邹德辉贺信莱董汉雄刘吉斌董中波朱丛茂陈浮王学敏
Owner 武钢集团有限公司
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