A kind of heat penetration process of s32750 duplex stainless steel

A technology of duplex stainless steel and pipe penetration, which is applied in the field of heat penetration pipe technology, can solve the problems of uneven wall surface and core structure, easy cracking strength of heat penetration pipe, and difficult coordination of dual phase structure, etc. The effects of small particle size, improved strength and toughness, and uniform distribution of the two phases

Active Publication Date: 2019-11-12
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many problems in its actual industrial production, especially the two-phase structure is difficult to coordinate during the thermal deformation process, the hot-piercing pipe is easy to crack and has high strength, cold drawing is difficult, and the surface of the pipe wall and the core structure are not uniform.

Method used

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  • A kind of heat penetration process of s32750 duplex stainless steel
  • A kind of heat penetration process of s32750 duplex stainless steel
  • A kind of heat penetration process of s32750 duplex stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Heat the S32750 duplex stainless steel bar to 1250°C (this temperature is the solid solution temperature) and keep it warm for 60 minutes, and heat through the pipe at a temperature of 1050°C at a rate of 1m / s. The analysis results of the curve and deformed tissue are as follows: Figure 1-4 See Table 1 for grain size and two-phase ratio data.

Embodiment 2

[0055] The S32750 duplex stainless steel bar was processed with the same processing technology and parameters as in Comparative Example 14, the only difference being that the pipe penetration temperature was 950°C, and the grain size and two-phase ratio data are shown in Table 1.

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Abstract

The invention discloses a thermal pipe formation process of S32750 duplex stainless steel. The process comprises the following steps: after steel is heated to a pipe formation temperature of 950-1100 DEG C, the pipe formation is performed at a speed of 0.01-10 m / s; and a formed pipe is insulated for 20-100 s at the pipe formation temperature, and then, is cooled. The S32750 duplex stainless steel is subjected to the pipe formation by the pipe formation process; firstly, when the pipe formation is performed on the steel, the rheology of a pipe body is more stable, the stress change in various parts is less, and the process is more suitable for actual production; and then, after the steel is subjected to pipe formation, the internal structure grains are smaller, and the two-phase distribution is more uniform, so that the formed steel is stable in intercrystalline structure, so that the strength and the toughness of the formed steel are improved.

Description

technical field [0001] The invention relates to a forming process, in particular to a heat-through pipe process of S32750 duplex stainless steel. Background technique [0002] Duplex stainless steel combines the performance characteristics of ferritic stainless steel and austenitic stainless steel. It has excellent corrosion resistance, good weldability and good comprehensive mechanical properties. A class of steel grades in which austenitic and martensitic stainless steel phases are juxtaposed. [0003] The 21st century is also the ocean century, and the production of offshore oil fields will account for 90% of the total oil production in 2035. Offshore oil and gas exploration will be carried out in deep sea, open sea and areas with harsh sea conditions. Traditional carbon steel and austenitic steel pipes are difficult to meet their requirements, which will greatly increase the demand for large-diameter submarine oil and gas pipelines with high corrosion resistance and hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B19/04C21D9/08
CPCB21B19/04C21D9/08
Inventor 涂益友潘盛佳袁孟琪蒋建清
Owner SOUTHEAST UNIV
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