Heat treatment method of thin-specification quenching and tempering 07MnNiMoDR steel plate

A heat treatment method and thin-gauge technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as reduced elongation, upper limit, and lower limit of steel plate strength, and achieve stable product performance, excellent toughness, and moderate strength. Effect

Inactive Publication Date: 2020-04-21
WUYANG IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively small amount of thin-gauge quenched and tempered 07MnNiMoDR ​​steel plate, in actual production, insufficient attention has been paid to its process research, and the strength of thin-gauge quenched and tempered 07MnNiMoDR ​​steel plate is often low or exceeds the upper limit, and cannot meet the standard requirements
[0004] The main reason is that due to the thin thickness of the steel plate, if the steel plate is quenched with the maximum amount of water, nearly 100% of the hard phase bainite will be formed in the direction of the entire thickness of the steel plate, resulting in its strength exceeding the upper limit; if the steel plate is tempered at a higher temperature It is difficult to accurately determine the tempering process, and it is very easy for the steel plate strength to fall below the lower limit of the material standard, that is, the strength of the steel plate is extremely unstable; in addition, when the steel plate strength exceeds the upper limit, it is accompanied by a decrease in elongation and Prone to unqualified elongation

Method used

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  • Heat treatment method of thin-specification quenching and tempering 07MnNiMoDR steel plate
  • Heat treatment method of thin-specification quenching and tempering 07MnNiMoDR steel plate
  • Heat treatment method of thin-specification quenching and tempering 07MnNiMoDR steel plate

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Experimental program
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Effect test

Embodiment 07

[0021] The thickness of the 07MnNiMoDR ​​steel plate in this embodiment is 10mm.

[0022] (1) Quenching process: Quenching temperature 840°C, total heating time (PLC+0) min, and 3500m into the quenching machine after being out of the furnace 3 The water volume per hour is water-cooled, the roll speed of the quenching machine is 18m / min, and the steel plate is cooled to room temperature.

[0023] (2) Tempering process: the tempering temperature is 610°C, the total heating time is 5.5min / mm, and the furnace is air-cooled to room temperature.

[0024] The grain size of the heat-treated steel plate in this example is grade 9.5, and its metallographic structure is tempered bainite + ferrite, of which tempered bainite accounts for 93%. The mechanical properties are shown in Table 1.

Embodiment 2

[0026] The thickness of the 07MnNiMoDR ​​steel plate in this embodiment is 14mm.

[0027] (1) Quenching process: Quenching temperature 850°C, total heating time (PLC+10) min, 3600m into the quenching machine after being out of the furnace 3 The water volume per hour is water-cooled, the roll speed of the quenching machine is 20m / min, and the steel plate is cooled to room temperature.

[0028] (2) Tempering process: the tempering temperature is 620°C, the total heating time is 5.0 min / mm, and the furnace is air-cooled to room temperature.

[0029] The grain size of the heat-treated steel plate in this example is 8.5, and its metallographic structure is tempered bainite + ferrite, of which tempered bainite accounts for 92%. The mechanical properties are shown in Table 1.

Embodiment 3

[0031] The thickness of the 07MnNiMoDR ​​steel plate in this embodiment is 16mm.

[0032] (1) Quenching process: Quenching temperature 860°C, total heating time (PLC+5) min, and 3900m into the quenching machine after being out of the furnace 3 The water volume per hour is water-cooled, the roll speed of the quenching machine is 26m / min, and the steel plate is cooled to room temperature.

[0033] (2) Tempering process: the tempering temperature is 630°C, the total heating time is 4.8 min / mm, and the furnace is air-cooled to room temperature.

[0034] The grain size of the heat-treated steel plate in this example is 9.0, and its metallographic structure is tempered bainite + ferrite, of which tempered bainite accounts for 91%. The mechanical properties are shown in Table 1.

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Abstract

The invention discloses a heat treatment method of a thin-specification quenching and tempering 07MnNiMoDR steel plate. The heat treatment method adopts a quenching and tempering combined process. Thequenching process comprises the following steps that the quenching temperature is 840-860 DEG C, the total heating time is PLC+(0-15) min, and water cooling is carried out to normal temperature afterdischarging; and the tempering process comprises the following steps that the tempering temperature is 610-630 DEG C, the total heating time is 4.0-5.5 min / mm, and air cooling is carried out to normal temperature after discharging. According to the heat treatment method of the thin-specification quenching and tempering 07MnNiMoDR steel plate, a lower quenching temperature is selected, and the proper tempering process is combined, so that the steel plate obtains a mixed structure of tempered bainite and ferrite in a certain proportion, the grain size is fine, the grain size reaches 8.0-10.0 grade, the obtained steel plate is moderate in strength and excellent in toughness, the transverse impact energy of minus 50 DEG C reaches 180 J or above, and the requirements of the steel plate for a low-temperature spherical tank are met.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to a heat treatment method for a steel plate, in particular to a heat treatment method for a thin-gauge quenched and tempered 07MnNiMoDR ​​steel plate. Background technique [0002] With the development of the petrochemical industry, the storage and transportation of chemical products is particularly important. Quenched and tempered 07MnNiMoDR, as a steel plate for spherical tanks, has been widely used in energy storage. [0003] Thin gauge quenched and tempered 07MnNiMoDR ​​steel plate with a thickness of ≤20mm is mainly used to manufacture the base support plate of the C tank spherical tank, and is used in conjunction with the thick steel plate. Due to the relatively small amount of thin-gauge quenched and tempered 07MnNiMoDR ​​steel plate, in actual production, insufficient attention has been paid to its process research, and the strength of thin-gauge quenched and tempered 07MnNiMoD...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D9/00C21D6/00
CPCC21D1/18C21D6/001C21D6/005C21D9/0081C21D2211/002C21D2211/005
Inventor 李杰赵国昌张海军龙杰刘生林明新于宏伟石莉李肖
Owner WUYANG IRON & STEEL
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