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A heat treatment preparation method for heat-strength and corrosion-resistant steel

A technology of corrosion-resistant steel and steel billet, which is applied in the field of heat treatment preparation of heat-resistant corrosion-resistant steel, can solve the problems of poor resistance to plastic deformation and damage, uneven distribution of carbides, and reduced fatigue life of steel, so as to improve strength and Corrosion resistance, good chloride stress corrosion resistance, and extended service life

Active Publication Date: 2021-10-22
SUZHOU QIJI WELDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing steel has low strength and uneven distribution of carbides in the steel, especially the existence of network carbides, which increases the brittleness of the steel and greatly reduces the fatigue life of the steel; moreover, under the combined action of high temperature and load The ability to resist plastic deformation and damage is poor. In places with harsh environments, steel is prone to corrosion and rust, poor oxidation resistance, short service life, increased costs, and will reduce its safety after a long time, resulting in potential safety hazards

Method used

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  • A heat treatment preparation method for heat-strength and corrosion-resistant steel
  • A heat treatment preparation method for heat-strength and corrosion-resistant steel

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Weigh each raw material component, mix the material, smelt it, and cast it into a billet; use a high-efficiency walking beam heating furnace for hot rolling; preheating section ≤ 850°C, heating section 1300°C, soaking section 1350°C , heat preservation 85min; start rolling temperature 1200°C, total billet heating time 240min; use the following components by weight as raw materials: C: 0.3%, Cr: 9%, Al: 4%, N: 1%, Nb : 0.04%, V: 0.12%, Mo: 0.18%, Mn: 4.2%, Si: 0.02%, S: 0.001-0.005%, Ba: 0.004%, Cu: 0.06%, the balance is Fe and unavoidable impurities .

[0028] (2) The number of times of rough rolling is 3 times, and the reduction ratio of each pass is controlled below 35%; after rough rolling, high pressure water is turned on to remove phosphorus, and the phosphorus removal pressure is 17MPa;

[0029] (3) Finish rolling: use KOCKS three-roller reducing sizing unit for rolling, set the temperature into KOCKS to be 820°C, the temperature of finish rolling to be 850°C...

Embodiment 2

[0033] (1) Weigh the components of each raw material, mix the materials, smelt them, and cast them into billets; use a high-efficiency walking beam heating furnace for hot rolling; the preheating section is ≤850°C, the heating section is 1250°C, and the soaking section is 1350°C , heat preservation 80min; start rolling temperature 1050°C, total billet heating time 150min; use the following components in parts by weight as raw materials: C: 0.35%, Cr: 8.5%, Al: 2.5%, N: 1%, Nb : 0.05%, V: 0.15%, Mo: 0.15%, Mn: 4%, Si: 0.05%, S: 0.001-0.005%, Ba: 0.003%, Cu: 0.05%, the balance is Fe and unavoidable impurities .

[0034] (2) The number of times of rough rolling is 4 times, and the reduction rate of each pass is controlled below 35%; after rough rolling, high-pressure water is turned on to remove phosphorus, and the phosphorus removal pressure is 18MPa;

[0035] (3) Finish rolling: use KOCKS three-roller reducing sizing unit for rolling, set the temperature into KOCKS to be 840°C...

Embodiment 3

[0039](1) Weigh the components of each raw material, mix the materials, smelt them, and cast them into billets; use a high-efficiency walking beam heating furnace for hot rolling; the preheating section is ≤850°C, the heating section is 1280°C, and the soaking section is 1380°C , heat preservation 90min; start rolling temperature 1150°C, total billet heating time 180min; use the following components by weight as raw materials: C: 0.4%, Cr: 10.5%, Al: 3.5%, N: 0.8%, Nb : 0.05%, V: 0.12%, Mo: 0.16%, Mn: 4.5%, Si: 0.3%, S: 0.001-0.005%, Ba: 0.005%, Cu: 0.08%, the balance is Fe and unavoidable impurities .

[0040] (2) The number of times of rough rolling is 6 times, and the reduction rate of each pass is controlled below 35%; after rough rolling, high-pressure water is turned on to remove phosphorus, and the phosphorus removal pressure is 18MPa;

[0041] (3) Finish rolling: KOCKS three-roller reducing and sizing unit is used for rolling, the temperature of entering KOCKS is set ...

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Abstract

The invention belongs to the technical field of metal alloys, and relates to a heat treatment preparation method of heat-strength and corrosion-resistant steel; firstly, materials are mixed, smelted, and cast into steel billets; 6 times, and control the reduction rate of each pass to be less than 35%; after rough rolling, turn on high-pressure water to remove phosphorus; carry out finish rolling, the temperature is 850-880°C, and the reduction of each pass of finish rolling is 15-25% ;Finally, heat treatment is carried out, quenching the rolled steel plate, water cooling to below 200°C after quenching, and cooling to room temperature; then tempering, repeated three times, cooling to room temperature. The corrosion resistance of steel is closely related to its forging and heat treatment process. The forging and heat treatment process provided by the present invention improves the corrosion resistance of steel; In the subsequent use process, after quenching and tempering treatment, there is no carbide network, carbide bands are low-level, and the structure is fine and uniform.

Description

technical field [0001] The invention belongs to the technical field of metal alloys, and in particular relates to a heat treatment preparation method of heat-strength corrosion-resistant steel. Background technique [0002] In recent years, with the development of science and technology and urbanization, the construction industry has developed rapidly, and my country has become the largest market for steel consumption; in the total production and consumption of steel, construction steel bars account for a large proportion; The field of application and the medium environment in which it is located are becoming more and more complex, and higher and higher requirements are put forward for the corrosion resistance of steel reinforcement materials. [0003] On the other hand, in recent years, the green development of the construction industry has been advocated. In order to save steel and improve the safety of building structures, there is a higher demand for the strength and toug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/38
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/001C22C38/002C22C38/02C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/38
Inventor 赵小军谷杰王传森
Owner SUZHOU QIJI WELDING MATERIALS CO LTD
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