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Large-thickness high-strength heat-resistant steel plate and production method thereof

A production method and a large-thickness technology, applied in the field of metallurgy, can solve the problems of great impact on economic benefits, high applicable temperature of steel plates, complex production process, etc., and achieve the effects of simple process, high temperature strength and low production cost

Inactive Publication Date: 2020-04-28
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steel plates for high-temperature equipment must ensure high-temperature performance at 400°C to 500°C. The yield strength of steel plates decreases as the temperature increases. Therefore, the greater the thickness, the higher the applicable temperature of the steel plate, and the harder it is to guarantee the strength.
Traditional high-temperature steel plates add more Cr and V elements, so they are more sensitive to temperature, easy to crack in the production process, complicated production process, difficult to produce, prone to batch discrepancy in steel plate production, and have a great impact on economic benefits

Method used

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  • Large-thickness high-strength heat-resistant steel plate and production method thereof
  • Large-thickness high-strength heat-resistant steel plate and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The production method of the large-thickness high-strength heat-resistant steel plate in this embodiment includes the steps of billet heating, controlled rolling and heat treatment. The control parameters of each process are as follows:

[0020] Heating process: the highest billet heating temperature is 1280°C, the soaking temperature is 1250°C, and the heating time is 10.5min / cm;

[0021] Controlled rolling process: two-stage rolling process is adopted, the rolling temperature of the first stage is 1000°C; ℃;

[0022] Heat treatment process: normalizing process is adopted, the normalizing temperature is 910°C, the thermal insulation coefficient is 2.2min / mm, and the steel plate is cooled in water for 3min after it is released from the furnace.

[0023] The thickness of the large-thickness high-strength heat-resistant steel plate of this embodiment is 40mm, and its metallographic structure is as follows figure 1 As shown, it can be seen from the figure that the struc...

Embodiment 2

[0026] The production method of the large-thickness high-strength heat-resistant steel plate in this embodiment includes the steps of billet heating, controlled rolling and heat treatment. The control parameters of each process are as follows:

[0027] Heating process: the highest billet heating temperature is 1280°C, the soaking temperature is 1243°C, and the heating time is 10min / cm;

[0028] Controlled rolling process: two-stage rolling process is adopted, the rolling temperature of the first stage is 1010°C; ℃;

[0029] Heat treatment process: normalizing process is adopted, the normalizing temperature is 920°C, the thermal insulation coefficient is 2.5min / mm, and the steel plate is cooled in water for 4min after it comes out of the furnace.

[0030] In this embodiment, the thickness of the large-thickness high-strength heat-resistant steel plate is 40mm, and the structure of the steel plate is pearlite plus ferrite, of which pearlite accounts for 28%. The internal struc...

Embodiment 3

[0033] The production method of the large-thickness high-strength heat-resistant steel plate in this embodiment includes the steps of billet heating, controlled rolling and heat treatment. The control parameters of each process are as follows:

[0034] Heating process: the highest billet heating temperature is 1280°C, the soaking temperature is 1240°C, and the heating time is 10.2min / cm;

[0035] Controlled rolling process: two-stage rolling process is adopted, the rolling temperature of the first stage is 1150°C; ℃;

[0036] Heat treatment process: normalizing process is adopted, the normalizing temperature is 910°C, the thermal insulation coefficient is 2.2min / mm, and the steel plate is cooled in water for 4min after it comes out of the furnace.

[0037] In this embodiment, the thickness of the large-thickness high-strength heat-resistant steel plate is 70 mm. The structure of the steel plate is pearlite plus ferrite, of which pearlite accounts for 25%. The internal struct...

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Abstract

The invention discloses a large-thickness high-strength heat-resistant steel plate and a production method thereof, and belongs to the technical field of metallurgy. The steel plate is prepared from the chemical components in percentage by mass: 0.16-0.19% of C, less than or equal to 0.55% of Si, 1.55-1.65% of Mn, less than or equal to 0.020% of P, less than or equal to 0.008% of S, 0.020-0.052% of Alt, 0.03-0.04% of Nb, 0.08-0.10% of Mo, 0.035-0.060% of V, and the balance of Fe and unavoidable impurities. The production method of the large-thickness high-strength heat-resistant steel plate includes the procedures of billet heating, controlled rolling and heat treatment, wherein the heat treatment procedure adopts a normalizing process, and the normalizing temperature is 910-920 DEG C. Thelarge-thickness high-strength heat-resistant steel plate is of a composite structure of pearlite and ferrite, the grain size is 8.0-10.0 grade, the steel plate has good hot strength and good impact toughness, the procedures are simple, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a large-thickness high-strength heat-resistant steel plate and a production method thereof. Background technique [0002] With the rapid development of the national economy, higher and higher requirements are placed on the environment and safety of equipment. However, as the temperature of the steel plate increases, its resistance to plastic deformation continues to decrease. With the rapid development of petroleum, chemical industry, power station, boiler and other industries, the requirements for thickness specifications and heat resistance of reactors, heat exchangers, separators, spherical tanks and other components are getting higher and higher. Steel plates for high-temperature equipment must ensure high-temperature performance at 400°C to 500°C. The yield strength of steel plates decreases as the temperature increases. Therefore, the greater the thickness, ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02C21D1/28
CPCC21D1/28C21D8/0226C21D8/0263C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 李杰赵国昌龙杰刘生林明新李肖石莉张海军谢东朱宜进
Owner WUYANG IRON & STEEL
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