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Heat treatment method of thick-wall P92 steel pipe

A heat treatment method and steel pipe technology, applied in the field of heat-resistant steel pipe manufacturing, can solve the problems of inconsistent grain size and large performance differences between different batches of products, and achieve the effects of good structure state, elimination of hot-rolled structure inheritance, and wide application

Active Publication Date: 2021-08-10
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a heat treatment method for thick-walled P92 steel pipes, in order to solve the problem that the grain size in the production of P92 steel pipes in the prior art does not meet the standard requirements. Technical problems with large performance differences between batches of products

Method used

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  • Heat treatment method of thick-wall P92 steel pipe
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  • Heat treatment method of thick-wall P92 steel pipe

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Embodiment 1

[0048] The heat treatment method of a OD314×72mm thick-walled P92 steel pipe provided in this embodiment, the length of the P92 steel pipe is ≤12500mm, includes the following steps:

[0049] (1) Put the P92 steel pipe into the heat treatment furnace and raise the temperature to 980°C at a heating rate of 150°C / h; hold for 108min;

[0050] (2) Furnace cooling to 760°C at a cooling rate of 1°C / min; hold for 432min;

[0051] (3) out of the furnace and air-cooled; the schematic diagram of steps (1) to (3) is as follows figure 1 shown.

[0052] (4) Normalize at 1050°C, keep warm for 108min, take out the furnace and place it on the cooling bed for air cooling, and air cool until the surface temperature of the steel pipe reaches 95°C;

[0053] (5) Temper at 765°C, keep warm for 180 minutes, take it out of the oven and place it on a cooling bed for air cooling.

[0054] Sampling microscope to examine microstructure, such as figure 2 As shown, the microstructure of the sample is t...

Embodiment 2

[0060] The heat treatment method of a OD483×85mm thick-walled P92 steel pipe provided in this embodiment, the length of the P92 steel pipe is ≤12500mm, includes the following steps:

[0061] (1) Put the P92 steel pipe into the heat treatment furnace and raise the temperature to 980°C at a heating rate of 150°C / h; hold for 128min;

[0062] (2) Furnace cooling to 760°C at a cooling rate of 1°C / min; keep warm for 510min;

[0063] (3) out of the furnace and air-cooled; the schematic diagram of steps (1) to (3) is as follows image 3 shown.

[0064] (4) Normalize at 1065°C, keep warm for 128min, take out the furnace and place it on a cooling bed for air cooling, and air cool until the surface temperature of the steel pipe reaches 95°C;

[0065] (5) Temper at 775°C, keep warm for 213 minutes, take it out of the oven and place it on a cooling bed for air cooling.

[0066] Sampling microscope to examine microstructure, such as Figure 4 As shown, the microstructure of the sample i...

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Abstract

The invention provides a heat treatment method for a thick-wall P92 (10Cr9MoW2VNbBN) steel pipe, and aims to solve the technical problems that in the prior art, the grain size in P92 steel pipe production does not meet standard specifications, and the performance difference of products in different batches is large. According to the heat treatment method for the thick-wall P92 steel pipe, the P92 steel pipe is subjected to high-temperature austenitizing and isothermal annealing and then subjected to normalizing and tempering, the temperature rise before austenitizing heat preservation can be achieved through rapid temperature rise, and therefore the heating speed of the steel pipe is increased, and the nucleation rate of austenite is increased. According to the method, a manufactured product is good in structure state, the microscopic structure is tempered martensite, the grain size is larger than or equal to the fifth grade, and the grade difference does not exceed the third grade, the mechanical property meets the ASME SA-335-2019 and GB / T 5310-2017 standard requirements, and the comprehensive performance reaches the international advanced level.

Description

technical field [0001] The invention belongs to the field of heat-resistant steel pipe manufacturing, and in particular relates to a heat treatment method for thick-walled P92 steel pipes. Background technique [0002] my country is a big country in energy production and consumption, and mainly consumes fossil energy. Coal plays an extremely important role in economic and social development. It is predicted that China's annual energy consumption will increase from 4.62 billion tons of standard coal in 2018 to 6 billion tons of standard coal in 2050. Compared with other energy sources, the absolute value and proportion of coal consumption is still the largest. For example, coal power is still dominant in China's power structure and nuclear power, accounting for about 65% of the total power generation. A large amount of harmful substances emitted by coal power have led to the deterioration of urban air quality and large-scale acid rain deposition, which has caused very serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D1/18C21D9/08
CPCC21D1/28C21D1/18C21D9/08C21D9/085Y02P10/20
Inventor 张银桥黎福华孔繁革朱志宝李勇李海松张洋波
Owner DAYE SPECIAL STEEL CO LTD
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