Acid-proof X70MS steel-grade spiral welded pipe and manufacturing method thereof

A technology of spiral welded pipe and manufacturing method, which is applied in the field of acid-resistant X70MS steel grade spiral welded pipe and its manufacturing field, can solve problems such as pipeline failure and hydrogen sulfide acid corrosion, and achieve improved accuracy and reliability, strong practicability, optimized double The effect of the milling operation

Active Publication Date: 2012-01-25
CNPC BOHAI EQUIP MFG +2
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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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  • Acid-proof X70MS steel-grade spiral welded pipe and manufacturing method thereof
  • Acid-proof X70MS steel-grade spiral welded pipe and manufacturing method thereof
  • Acid-proof X70MS steel-grade spiral welded pipe and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The chemical composition of the coil used in the acid-resistant X70MS steel grade spiral welded pipe in this example is shown in Table 1, and the mechanical properties are shown in Table 2. The thickness of the steel plate is 13.7mm, and the outer diameter of the steel pipe is F914mm. The manufacturing process steps of the acid-resistant X70MS steel grade spiral welded pipe are as follows:

[0031] 1. The coil is uncoiled and leveled;

[0032] 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 7.5mm 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;

[0033] 3. Pre-bending: Pre-bend the delivery side and free side of the coiled plate on th...

Embodiment 2

[0059] The chemical composition of the coil used in the acid-resistant X70MS steel grade spiral welded pipe in this example is shown in Table 8, and the mechanical properties are shown in Table 9. The thickness of the steel plate is 13.7mm, and the outer diameter of the steel pipe is F914mm. The manufacturing process steps of the acid-resistant X70MS steel grade spiral welded pipe are as follows:

[0060] 1. The coil is uncoiled and leveled;

[0061] 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 7.0mm and a groove angle of 30°, and a 60° X-shaped groove is formed after the two sides of the steel plate are butted;

[0062] 3. Pre-bending: Pre-bend the delivery side and free side of the coiled plate on the tw...

Embodiment 3

[0088] The chemical composition of the coil used in the acid-resistant X70MS steel grade spiral welded pipe in this example is shown in Table 15, and the mechanical properties are shown in Table 16. The thickness of the steel plate is 13.7mm, and the outer diameter of the steel pipe is F914mm. The manufacturing process steps of the acid-resistant X70MS steel grade spiral welded pipe are as follows:

[0089] 1. The coil is uncoiled and leveled;

[0090] 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 respectively made with a groove with a blunt edge size of 8mm and a groove angle of 40°, and an 80° X-shaped groove is formed after the two sides of the steel plate are butted;

[0091] 3. Pre-bending: Pre-bend the delivery side and free side of t...

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Abstract

The invention discloses an acid-proof X70MS steel-grade spiral welded pipe and a manufacturing method thereof. The spiral welded pipe is made of X70MS steel-grade plate coils. The processing process for the spiral welded pipe comprises the following steps of: uncoiling, flattening, milling edges, prebending, molding, internally welding, externally welding, expanding the end of the pipe, performing laminated ultrasonic inspection on a base material, performing X-ray inspection on welding seams, performing a hydrostatic test, performing ultrasonic inspection on the welding seams, chamfering theend of the pipe and inspecting a finished product. The X70MS steel-grade spiral seam submerged-arc welding pipe has high intensity and high acid resistance and is suitable for conveying acid oil gas media.

Description

technical field [0001] The invention relates to a welded pipe and a manufacturing method thereof, in particular to an acid-resistant X70MS steel grade spiral welded pipe 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 dissolving hydrogen sulfide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08C22C38/50
Inventor 李建一田鹏李延丰孙宏王松涛田志红孙志刚谷海龙崔明亮韩学
Owner CNPC BOHAI EQUIP MFG
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