Heat treatment method of large-thickness high-toughness 15CrMoR steel plate

A heat treatment method and high toughness technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of difficult matching of steel plate strength and toughness, harsh service conditions of steel plates, and unsatisfactory steel plates, so as to improve economic and social benefits, Good matching of strength and toughness, the effect of solving technical problems of heat treatment

Active Publication Date: 2017-07-07
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the thickness of the steel plate increases, it becomes more and more difficult to match the strength and toughness of the steel plate. In addition, the user's use conditions for the steel plate are becoming more and more stringent.
Therefore, the traditional heat treatment process cannot meet the technical requirements of the steel plate, and the structure of the steel plate must be controlled during the heat treatment process to achieve a good match between the strength and toughness of the steel plate.

Method used

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  • Heat treatment method of large-thickness high-toughness 15CrMoR steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The heat treatment method of the large-thickness and high-toughness 15CrMoR steel plate adopts the following process.

[0019] Steel type 15CrMoR, chemical composition (wt): C 0.12%, Si 0.23%, Mn 0.50%, P 0.007%, S 0.002%, Ni 0.15%, Cr 0.98%, Mo 0.55%, TAl (full aluminum) 0.035%, The balance is Fe and unavoidable impurities. The thickness of the steel plate is 110mm, the AC1 is 760°C, and the AC3 is 877°C. The specific heat treatment process is as follows:

[0020] The first normalizing temperature is 925°C, the total heating time is PLC+20min, and the maximum water volume is 4350m 3 / h, the water temperature is kept at 23°C, the temperature of returning to red is 210°C; the second normalizing temperature is 890°C, the total heating time is PLC+15min, and the maximum water volume of water cooling is ≥4680m 3 / h, the water temperature is kept at 21°C, the swinging time is 20min, and the cooling is guaranteed to be at room temperature (the surface temperat...

Embodiment 2

[0022] Embodiment 2: The heat treatment method of the large-thickness and high-toughness 15CrMoR steel plate adopts the following process.

[0023] Steel type 15CrMoR, chemical composition (wt): C 0.12%, Si 0.24%, Mn 0.49%, P 0.006%, S 0.001%, Ni 0.15%, Cr 1.02%, Mo 0.53%, TAl (full aluminum) 0.034%, The balance is Fe and unavoidable impurities. The thickness of the steel plate is 120mm, the AC1 is 761°C, and the AC3 is 875°C. The specific heat treatment process is as follows:

[0024] The first normalizing temperature is 920°C, the total heating time is PLC+20min, and the maximum water volume is 4450m 3 / h, the water temperature is kept at 22°C, the temperature of returning to red is 200°C; the second normalizing temperature is 895°C, the total heating time is PLC+18min, and the maximum water volume of water cooling is ≥4650m 3 / h, the water temperature is kept at 23°C, the swing time is 20min, and the cooling is guaranteed to be room temperature (the surface temperature of...

Embodiment 3

[0026] Embodiment 3: The heat treatment method of the large-thickness and high-toughness 15CrMoR steel plate adopts the following process.

[0027] Steel type 15CrMoR, chemical composition (wt): C 0.13%, Si 0.25%, Mn 0.49%, P 0.006%, S 0.001%, Ni 0.14%, Cr 1.00%, Mo 0.54%, TAl (full aluminum) 0.037%, The balance is Fe and unavoidable impurities. The thickness of the steel plate is 125mm, the AC1 is 758°C, and the AC3 is 880°C. The specific heat treatment process is as follows:

[0028] The first normalizing temperature is 930°C, the total heating time is PLC+25min, and the maximum water volume is 4420m 3 / h, the water temperature is kept at 24°C, the temperature of returning to red is 190°C; the second normalizing temperature is 900°C, the total heating time is PLC+20min, and the maximum water volume of water cooling is ≥4700m 3 / h, the water temperature is kept at 20°C, the rocking time is 25min, and the cooling is guaranteed to be room temperature (the surface temperature ...

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Abstract

The invention discloses a heat treatment method of a large-thickness high-toughness 15CrMoR steel plate. A heat treatment process of performing two-time normalization and tempering twice is adopted, first-time normalizing temperature is AC3 plus (30-50) DEG C, total heating time is PLC plus (20-30) min, and cooling is performed to self-tempering temperature; and second-time normalizing temperature is AC3 plus (10-20) DEG C, total heating time is PLC plus (10-20) min, and then cooling is performed to room temperature. Compared with a conventional technology adopting one-time normalization and tempering, the method adopting two-time normalization and tempering has the advantages that the core of a whole steel plate is good in toughness matching, so that the method is suitable for large batch production of large-thickness high-toughness 15CrMoR steel plates; and the treated steel plate not only is not good in tensile and cold bending properties, but also is good in low-temperature impact toughness. The steel plate treated by the method has the advantages that strength is moderate; toughness matching is good; -20DEG C transverse Charpy impact power at 1 / 2 position of plate thickness is equal to or larger than 47J; and the quality of the steel plate is stable.

Description

technical field [0001] The invention relates to a heat treatment control technology for steel plates, in particular to a heat treatment method for large-thickness and high-toughness 15CrMoR steel plates. Background technique [0002] 15CrMoR is a chromium and molybdenum pearlite low-alloy heat-resistant steel in the national standard. It has good high-temperature performance. This steel is mainly used as an important material under high-temperature conditions in power industry, petrochemical and other departments. 15CrMoR steel plate not only has good oxidation resistance and thermal strength, but also has relatively good resistance to sulfur corrosion and hydrogen corrosion, and the content of alloy elements is relatively small, with good process performance and physical properties, and is widely used. , mainly used to manufacture pressure vessels with working temperature higher than 450°C. However, as the thickness of the steel plate increases, it becomes more and more di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D9/00C21D6/00C22C38/02C22C38/04C22C38/44C22C38/06
CPCC21D1/28C21D6/004C21D6/005C21D6/008C21D9/0081C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 邓建军尹卫江袁锦程吴艳阳赵文忠龙杰王甜甜牛红星李样兵王东阳侯敬超瞿征
Owner WUYANG IRON & STEEL
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