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X65MS steel-grade spiral welded tube for acidic corrosion environment and manufacturing method thereof

A corrosive environment, spiral welded pipe technology, applied in the field of spiral welded pipe and its manufacturing, can solve the problems of acid corrosion of hydrogen sulfide, pipeline failure, etc., to achieve the effect of improving accuracy and reliability, strong practicability, and strengthening the control of forming residual stress

Active Publication Date: 2012-01-25
CNPC BOHAI EQUIP MFG +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the pipeline is exposed to the fluid medium containing wet hydrogen sulfide, it is prone to acid corrosion of hydrogen sulfide, resulting in sudden failure of the pipeline

Method used

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  • X65MS steel-grade spiral welded tube for acidic corrosion environment and manufacturing method thereof
  • X65MS steel-grade spiral welded tube for acidic corrosion environment and manufacturing method thereof
  • X65MS steel-grade spiral welded tube for acidic corrosion environment and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The main chemical composition of the coil used in the X65MS steel grade spiral welded pipe for acidic corrosive environment in this embodiment is shown in Table 1, and the mechanical properties are shown in Table 2. The thickness of the steel plate is 8.7mm, and the outer diameter of the steel pipe is Φ813mm. The manufacturing process steps of X65MS steel grade spiral welded pipe for acidic corrosive environment are as follows:

[0029] 1. Uncoiling and leveling of coil warp;

[0030] 2. Edge milling: first rough milling, and mill the edge width by 10-20mm to ensure that the edge defects and crescent bends of the coil due to the billet and the rolling process are removed; then the X-shaped groove is finely milled, that is, the steel plate coil Two butted plate edges are respectively provided with a groove with a blunt edge size of 6mm and a groove angle of 40°. After the two sides of the steel plate are butted, an 80° X-shaped groove is formed;

[0031] 3. Pre-bending: Pre-be...

Embodiment 2

[0058] The main chemical composition of the coils used in the X65MS steel grade spiral welded pipe for the acidic corrosive environment in this embodiment is shown in Table 8, and the mechanical properties are shown in Table 9. The thickness of the steel plate is 8.7mm, and the outer diameter of the steel pipe is Φ813mm. The manufacturing process steps of X65MS steel grade spiral welded pipe for acidic corrosive environment are as follows:

[0059] 1. Uncoiling and leveling of coil warp;

[0060] 2. Edge milling: first rough milling, and mill the edge width by 10-20mm to ensure that the edge defects and crescent bends of the coil due to the billet and the rolling process are removed; then the X-shaped groove is finely milled, that is, the steel plate coil Two butted plate edges are respectively provided with a groove with a blunt edge size of 6.5mm and a groove angle of 35°. After the two sides of the steel plate are butted, a 70° X-shaped groove is formed;

[0061] 3. Pre-bending: ...

Embodiment 3

[0087] The main chemical composition of the coil used in the X65MS steel grade spiral welded pipe for acidic corrosive environment in this embodiment is shown in Table 15, and the mechanical properties are shown in Table 16. The thickness of the steel plate is 8.7mm, and the outer diameter of the steel pipe is Φ813mm. The manufacturing process steps of X65MS steel grade spiral welded pipe for acidic corrosive environment are as follows:

[0088] 1. Uncoiling and leveling of coil warp;

[0089] 2. Edge milling: first rough milling, and mill the edge width by 10-20mm to ensure that the edge defects and crescent bends of the coil due to the billet and the rolling process are removed; then the X-shaped groove is finely milled, that is, the steel plate coil Two butted plate edges are respectively provided with a groove with a blunt edge size of 5.5mm and a groove angle of 45°. After the two sides of the steel plate are butted, a 90° X-shaped groove is formed;

[0090] 3. Pre-bending: Pre...

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Abstract

The invention discloses an X65MS steel-grade spiral welded tube for an acidic corrosion environment and a manufacturing method thereof. The spiral welded tube adopts an X65MS steel-grade coiled sheet. The processing procedures of the spiral welded tube comprise uncoiling, leveling, edge milling, pre-bending, forming, internal welding, external welding, tube end expanding, layering and ultrasonic inspection of a base material, X-ray inspection of a welding joint, hydrostatic test, ultrasonic inspection of the welding joint, tube end chamfering and inspection of the finished product. The X65MS steel-grade spiral welded tube disclosed by the invention has high strength and favorable acid resistance and is suitable for conveying an acid oil-gas medium.

Description

Technical field [0001] The invention relates to a spiral welded pipe and a manufacturing method thereof, in particular to an X65MS steel grade spiral welded pipe for acid corrosion environment and a manufacturing method thereof. Background technique [0002] Oil and natural gas are important energy sources for the development of the national economy, and their proportion in energy consumption is increasing. Pipeline transportation has become one of the most economical, safe and uninterrupted long-distance transportation tools for oil and natural gas. When the transmission pipeline is exposed to a fluid medium containing wet hydrogen sulfide, it is prone to acid corrosion of hydrogen sulfide, causing sudden failure of the pipeline. Among them, hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) are the main forms of hydrogen sulfide acid corrosion. [0003] The cause of hydrogen-induced cracking is generally believed to be that the acidic solution formed by dissolving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/46C22C38/50B23P15/00C22C38/48C22C38/54C22C38/42C22C38/16
Inventor 李建一田鹏李延丰孙宏王松涛许斌王文录田志红王海生孙志刚
Owner CNPC BOHAI EQUIP MFG
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