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An ultra-high-strength two-phase corrosion-resistant mixing tank steel and its production process

A stirred tank, ultra-high-strength technology, applied in the field of steel preparation, can solve the problems of unfavorable mixing tank forming and tailor welding, affecting the service life of the tank body, and easy cracking during cold forming, so as to avoid bulging or collapse defects and solve cold Effect of forming cracks and improving strength

Active Publication Date: 2022-05-20
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the invention process, the applicant found that: the Q355B material has low strength and is easy to soften after welding. Due to the high carbon equivalent design, there are obvious banded structures in the structure, easy cracking and low fatigue life in cold forming; Low, it is easy to be worn out and scrapped during service, which affects the service life of the tank
[0005] The traditional ultra-high-strength steel mainly uses tempered martensite as the matrix, and is produced by on-line quenching or off-line heat treatment. The steel plate has a high yield ratio, which is not conducive to the forming and tailor welding of the stirred tank.

Method used

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  • An ultra-high-strength two-phase corrosion-resistant mixing tank steel and its production process
  • An ultra-high-strength two-phase corrosion-resistant mixing tank steel and its production process
  • An ultra-high-strength two-phase corrosion-resistant mixing tank steel and its production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] S1. The slab is obtained by smelting and continuous casting. The chemical composition of the slab is: carbon: 0.21%; silicon: 1.55%; manganese: 2.08%; aluminum: 0.035%; phosphorus: 0.009%; sulfur: 0.003%; boron: 0.0008%, antimony: 0.10%, tin: 0.035%, the rest is iron and unavoidable impurities;

[0058] S2. Reheat the slab produced by smelting and continuous casting. The slab heating process adopts the hot charging and hot delivery process. The furnace temperature is ≥600°C, the slab reheating temperature is 1220°C, and the holding time is <180min.

[0059] S3. Rough rolling and 6-stand continuous finish rolling are carried out after the billet leaves the heating furnace. The rough rolling adopts 6-pass reciprocating rolling, the finish rolling entrance temperature is 1030°C, the thickness of the intermediate billet is 40mm, and the finish rolling adopts 6-stand continuous rolling. Rolling, the final rolling temperature is 840°C.

[0060] S4. Cooling after rolling adop...

Embodiment 2

[0063] S1. The slab is obtained by smelting and continuous casting. The chemical composition of the slab is: carbon: 0.22%; silicon: 1.75%; manganese: 1.83%; aluminum: 0.036%; phosphorus: 0.010%; sulfur: 0.003%; boron: 0.0009%, antimony: 0.11%, tin: 0.032%, the rest is iron and unavoidable impurities;

[0064] S2. Reheat the slab produced by smelting and continuous casting. The slab heating process adopts the hot charging and hot delivery process. The furnace temperature is ≥ 600°C, the slab reheating temperature is 1220°C, and the holding time is <180min.

[0065] S3. Rough rolling and 6-stand continuous finish rolling are carried out after the billet leaves the heating furnace. The rough rolling adopts 6-pass reciprocating rolling, the finish rolling entrance temperature is 1030°C, the thickness of the intermediate billet is 42mm, and the finish rolling adopts 6-stand continuous rolling. Rolling, the final rolling temperature is 840°C.

[0066] S4. Cooling after rolling ado...

Embodiment 3

[0069]S1. The slab is obtained by smelting and continuous casting. The chemical composition of the slab is: carbon: 0.24%; silicon: 1.70%; manganese: 1.90%; aluminum: 0.046%; phosphorus: 0.008%; sulfur: 0.004%; boron: 0.0007%, antimony: 0.09%, tin: 0.027%, the rest is iron and unavoidable impurities;

[0070] S2. Reheat the slab produced by smelting and continuous casting. The slab heating process adopts the hot charging and hot delivery process. The furnace temperature is ≥ 600°C, the slab reheating temperature is 1220°C, and the holding time is <180min.

[0071] S3. Rough rolling and 6-stand continuous finish rolling are carried out after the billet leaves the heating furnace. The rough rolling adopts 6-pass reciprocating rolling, the finish rolling entrance temperature is 1030°C, the thickness of the intermediate billet is 44mm, and the finish rolling adopts 6-stand continuous rolling. Rolling, the final rolling temperature is 840°C.

[0072] S4. Cooling after rolling adop...

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Abstract

The invention particularly relates to an ultra-high-strength dual-phase corrosion-resistant stirring tank steel and a production process thereof, belonging to the technical field of steel preparation. 1.75%, Mn: 1.80% to 2.10%, Alt: 0.030% to 0.065%, P: ≤ 0.015%, S: ≤ 0.004%, B: 0.0005% to 0.0009%, Sb: 0.08% to 0.12%, Sn: 0.020 %~0.035%, the rest is Fe and inevitable impurities; it has the advantages of easy forming, high strength, high wear resistance, good corrosion resistance and weldability, etc. Area softening, poor wear resistance and corrosion resistance, heavy tank weight and other problems; the performance of the steel plate has good stability to avoid bulging or collapse defects during the pressurization process.

Description

technical field [0001] The invention belongs to the technical field of steel preparation, and in particular relates to an ultra-high-strength two-phase corrosion-resistant stirring tank steel and a production process thereof. Background technique [0002] Concrete mixer truck is a special truck used to transport concrete for construction; because of its shape, it is also often called snail truck. These trucks are equipped with cylindrical mixing drums to carry the mixed concrete. During transportation, the mixing drum will always be kept rotating to ensure that the carried concrete will not solidify. After the concrete is delivered, the inside of the mixing drum is usually washed with water to prevent the hardened concrete from taking up space. At present, the steel used for mixing tanks generally adopts Q355B material, which is low in strength and is not conducive to light weight. Some companies have begun to use steel with a tensile strength of 520MPa, and a few companie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C22C38/06C22C38/04C22C38/02C21D8/02
CPCC22C38/60C22C38/008C22C38/06C22C38/04C22C38/02C21D8/0226C21D2211/002
Inventor 潘辉刘锟牛涛周娜吴科敏郭子锋张旭郭慧敏吕利鸽田志红李飞王松涛
Owner SHOUGANG CORPORATION