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A bainitic type x100 grade seamless line pipe and its manufacturing method

A technology of seamless line pipe and bainitic type, which is applied in the field of high-strength seamless line pipe and its manufacturing, which can solve the problems of performance degradation and achieve the effect of low welding crack sensitivity

Active Publication Date: 2019-07-23
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the influence of the welding process, the seamless line pipe using conventional quenched and tempered steel will experience a decline in the performance of the welded heat-affected zone, which is commonly known as weld softening
All of the above situations are unfavorable for seamless line pipe

Method used

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  • A bainitic type x100 grade seamless line pipe and its manufacturing method
  • A bainitic type x100 grade seamless line pipe and its manufacturing method
  • A bainitic type x100 grade seamless line pipe and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1-A6 and comparative example B1-B4

[0051] The bainitic grade X100 seamless line pipes of the above-mentioned Examples A1-A6 and the seamless line pipes of Comparative Examples B1-B4 were prepared by the following steps:

[0052] (1) smelt and forge the ingot into a round tube billet of φ 300mm according to the chemical composition ratios listed in Table 1;

[0053] (2) Forging to obtain a tube blank with a specification of 219mm*14.5mm

[0054] (3) Heat and keep warm the tube blank, and obtain the blank tube through piercing, continuous rolling, tension reduction or sizing, wherein the heating temperature of the blank tube is 1150-1300°C, and the holding time is 1-4h.

[0055] (4) Quenching: Heat the blank pipe to 920-1000°C, keep it warm for 0.3-1h, then rapidly cool it to below 180°C at a cooling rate of 15-80°C / s, and use oil quenching or water quenching for quenching.

[0056] (5) Tempering: the tempering temperature is 500°C to 700°C.

[0057] Table 1 lists the mass percentage distribution of chemical el...

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Abstract

The invention discloses a bainite X100-stage seamless line pipe. The microstructure of the bainite X100-stage seamless line pipe is mainly bainite. The bainite X100-stage seamless line pipe is prepared from the following chemical elements in percentage by mass: 0.03 to 0.09% of C (carbon). 0.1 to 0.5% of Si (silicon), 1.5 to 2.5% of Mn (manganese), 0.4 to 1% of Mo (molybdenum), 0.01 to 0.1% of Al(aluminum), the balance of Fe (iron) and unavoidable impurities. The invention also discloses a manufacturing method of the bainite X100-stage seamless line pipe. The bainite X100-stage seamless linepipe has the advantages that the microstructure mainly uses the bainite, the strength reaches X100, and the sensitivity to welding cracks is lower.

Description

technical field [0001] The invention relates to a line pipe and its manufacturing method, in particular to a high-strength seamless line pipe and its manufacturing method. Background technique [0002] Pipelines are the most economical and efficient way of oil and gas transportation. In recent years, the length of oil and gas pipelines has increased significantly, and the demand for line pipes has also increased accordingly. As we all know, the pipeline pressure and size directly affect the pipeline transmission efficiency, and with the continuous increase of the pipeline pressure, the requirements for the strength of the line pipe are also constantly increasing. [0003] However, for seamless line pipe products, due to the lack of thermomechanical control process (ie TMCP process) commonly used in welded line pipe in its process flow, the strength of seamless line pipe can only be improved by adding alloy elements and subsequent Heat treatment is achieved. However, since ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C22C38/16C22C38/08C21D8/10C21D1/18C21D9/08
CPCC21D1/18C21D8/105C21D9/085C21D2211/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16
Inventor 刘耀恒许轲
Owner BAOSHAN IRON & STEEL CO LTD
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