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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 problems such as hydrogen sulfide acid corrosion, 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: 2013-04-24
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The main chemical composition of the coils used in the X65MS steel grade spiral welded pipes used in the acid corrosion environment in this example are 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 acid corrosion environment are as follows:

[0029] 1. The coil is uncoiled and leveled;

[0030] 2. Edge milling: rough milling first, and milling off the width of the plate edge by 10-20mm to ensure the removal of plate edge defects and crescent bends caused by the steel billet and rolling process; then finish milling the X-shaped groove, that is, to The two butt plate edges are grooved with a blunt edge size of 6mm and a groove angle of 40°, and an 80° X-shaped groove is formed after the two sides of the steel plate are butted;

[0031] 3. Pre-bending: pre-bend the delivery side a...

Embodiment 2

[0057] The main chemical composition of the coils used in the X65MS steel grade spiral welded pipe for acid corrosion environment in this example 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 acid corrosion environment are as follows:

[0058] 1. The coil is uncoiled and leveled;

[0059] 2. Edge milling: rough milling first, and milling off the width of the plate edge by 10-20mm to ensure the removal of plate edge defects and crescent bends caused by the steel billet and rolling process; then finish milling the X-shaped groove, that is, to The two butt plate edges are grooved with a blunt edge size of 6.5mm and a groove angle of 35°, and an X-shaped groove of 70° is formed after the two sides of the steel plate are butted;

[0060] 3. Pre-bending: pre-bend the delivery side and fr...

Embodiment 3

[0086] The main chemical composition of the coils used in the X65MS steel grade spiral welded pipe for acid corrosion environment in this example 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 acid corrosion environment are as follows:

[0087] 1. The coil is uncoiled and leveled;

[0088] 2. Edge milling: rough milling first, and milling off the width of the plate edge by 10-20mm to ensure the removal of plate edge defects and crescent bends caused by the steel billet and rolling process; then finish milling the X-shaped groove, that is, to The two butt plate edges are grooved with a blunt edge size of 5.5mm and a groove angle of 45°, and a 90° X-shaped groove is formed after the two sides of the steel plate are butted;

[0089] 3. Pre-bending: pre-bend the delivery side and free...

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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 day by day; pipeline transportation has become the most economical, safe and uninterrupted long-distance transportation tool for oil and natural gas. 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. Among them, hydrogen induced cracking (HIC) and sulfide stress cracking (SSC) are the main forms of hydrogen sulfide acid corrosion. [0003] The reason for hydrogen-induced cracking is generally believed to be that the acidic solution formed by diss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C22C38/16B23P15/00
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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