Anti-cracking spiral steel pipe for long distance oil and gas transmission and manufacturing process thereof

A technology of spiral steel pipe and manufacturing process, which is applied in the field of anti-crack spiral steel pipe for long-distance oil and gas transportation and its manufacturing process, which can solve the problem of declining service performance of spiral steel pipe, affecting the mechanical properties of welds, and affecting the safety and stability of oil and gas transportation To achieve the effect of strengthening the control of forming residual stress, strengthening the control of welding process parameters, and improving the efficiency of butt joint

Inactive Publication Date: 2020-09-29
TIANJIN TONGXINTAI STEEL PIPE MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The weld performance of the spiral steel pipe has an important influence on the mechanical properties such as the overall strength of the spiral steel pipe. However, during the welding process of the spiral steel pipe, pores are prone to appear in the weld, which will directly affect the mechanical properties of the weld, and then lead to spiral The overall service performance of steel pipes has declined severely, affecting the safety and stability of oil and gas transportation

Method used

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  • Anti-cracking spiral steel pipe for long distance oil and gas transmission and manufacturing process thereof
  • Anti-cracking spiral steel pipe for long distance oil and gas transmission and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A crack-proof spiral steel pipe for long-distance oil and gas transportation,

[0042]The weight percent of the chemical composition of the base metal steel plate is: C 0.12%, Si 0.25%, Mn 1.09%, P 0.2%, S0.12%, V0.024%, Cr 0.04%, Ni 0.0053%, Cu 0.015%, Yu Amount of Fe;

[0043] The thickness of the base steel plate is 7.2mm;

[0044] The yield strength of the parent steel plate is 495Mpa, and the tensile strength is 540Mpa;

[0045] The weight percent of the chemical composition of the spiral weld is: C 0.06%, Si 0.15%, Mn 2.3%, P≤0.15%, S≤0.06%, V 0.046%, Cr 0.008%, Ni 0.19%, Cu 0.04%, Ti 0.031%, B 0.06%, balance Fe;

[0046] The manufacturing process includes the following steps:

[0047] S1, unwinding and leveling;

[0048] S2, edge milling: adopt double edge milling process, first rough mill I-shaped groove; then fine-mill X-shaped groove, blunt edge 7.0mm, groove angle 75°;

[0049] S3, pre-bending: the size of the pre-bending edge is 465mm in radius and 90m...

Embodiment 2

[0057] A crack-proof spiral steel pipe for long-distance oil and gas transportation,

[0058] The weight percent of the chemical composition of the base metal steel plate is: C 0.17%, Si 0.28%, Mn 1.1%, P 0.19%, S0.11%, V0.02%, Cr 0.05%, Ni 0.01%, Cu 0.02%, Yu Amount of Fe;

[0059] The thickness of the base steel plate is 7.8mm;

[0060] The yield strength of the parent steel plate is 500Mpa, and the tensile strength is 578Mpa;

[0061] The weight percent of the chemical composition of the spiral weld is: C 0.09%, Si 0.18%, Mn 2.5%, P≤0.15%, S≤0.06%, V 0.033%, Cr 0.1%, Ni 0.2%, Cu 0.046%, Ti 0.026%, B 0.02%, balance Fe;

[0062] The manufacturing process includes the following steps:

[0063] S1, unwinding and leveling;

[0064] S2, edge milling: adopt double edge milling process, first rough mill I-shaped groove; then fine-mill X-shaped groove, the blunt edge is 7.5mm, and the groove angle is 80°;

[0065] S3, pre-bending: the size of the pre-bending edge is 465mm in r...

Embodiment 3

[0073] A crack-proof spiral steel pipe for long-distance oil and gas transportation,

[0074] The weight percent of the chemical composition of the base metal steel plate is: C 0.2%, Si 0.31%, Mn 1.14%, P 0.15%, S0.09%, V0.015%, Cr 0.06%, Ni 0.013%, Cu 0.022%, Yu Amount of Fe;

[0075] The thickness of the parent steel plate is 8.6mm;

[0076] The yield strength of the parent steel plate is 550Mpa, and the tensile strength is 610Mpa;

[0077] The weight percentage of the chemical composition of the spiral weld is: C 0.12%, Si 0.23%, Mn 2.8%, P≤0.15%, S≤0.06%, V 0.02%, Cr 0.12%, Ni 0.22%, Cu 0.055%, Ti 0.023%, B 0.01%, balance Fe;

[0078] The manufacturing process includes the following steps:

[0079] S1, unwinding and leveling;

[0080] S2, edge milling: adopt double edge milling process, first rough mill I-type groove; then fine-mill X-type groove, blunt edge 8.0mm, groove angle 85°;

[0081] S3, pre-bending: the size of the pre-bending edge is 465mm in radius and 105...

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Abstract

The invention discloses an anti-cracking spiral steel pipe for long distance oil and gas transmission. A base material steel plate comprises the following components in percent by weight: 0.12-0.2% ofC, 0.25-0.31% of Si, 1.09-1.14% of Mn, 0.15-0.2% of P, 0.09-0.12% of S, 0.015-0.024% of V, 0.04-0.06% of Cr, 0.005-0.013% of Ni, 0.015-0.022% of Cu and the balance Fe. The base material steel plate is 7.2-8.6 mm thick. A weld joint comprises the following components in percent by weight: 0.06-0.12% of C, 0.15-0.23% of Si, 2.3-2.8% of Mn, less than or equal to 0.15% of P, less than or equal to 0.06% of S, 0.02-0.046% of V, 0.08-0.12% of Cr, 0.19-0.22% of Ni, 0.04-0.055% of Cu, 0.023-0.031% of Ti, 0.01-0.06% of B and the balance Fe. A manufacturing method comprises the following steps of uncoiling and flattening, edge milling, pre-bending, rolling sleeve forming, derusting, deoiling, internal welding, external welding and pipe end expanding, wherein internal welding adopts double wire tandem submerged automatic arc welding, a direct current is used in a first wire, the current is 870-1020 A and the voltage is 31-33 V; an alternating current is used in a second wire, the current I is equal to 395-455 A, the voltage is 34-36 V, the separation distance between the welding wires is 10-14 mm and the speed is 1.8-1.9 m/min; external welding adopts double wire tandem submerged automatic arc welding, a direct current is used in a first wire, the current is 845-900 A and the voltage is 31-33 V; and an alternating current is used in a second wire, the current is 395-450 A, the voltage is34-36 V, the separation distance between the welding wires is 12-16 mm and the speed is 1.8-1.9 m/min. The spiral steel pipe is few in pores of the weld joint, excellent in integral mechanical property and suitable for long distance oil and gas transmission.

Description

technical field [0001] The invention relates to the technical field of spiral steel pipes, in particular to a crack-proof spiral steel pipe for long-distance oil and gas transportation and a manufacturing process thereof. Background technique [0002] Oil and gas pipeline transportation is the most suitable transportation method for long-distance transportation of oil and gas. The pipelines used usually include straight seam steel pipes and spiral steel pipes. Compared with straight seam steel pipes, spiral steel pipes have more prominent advantages in pipeline crack arrest and are more widely used in oil and gas pipeline transportation. [0003] The existing Chinese patent whose authorized announcement number is CN102284550B can be referred to, which discloses a manufacturing process of spiral seam submerged arc welded pipe, including: 1) raw material inspection, 2) material preparation, 3) uncoiling, 4) leveling, 5) Steel strip butt-to-end, 6) Disc cutting, 7) Edge millin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K9/18C22C38/02C22C38/04C22C38/46C22C38/42C22C38/58C22C38/50C22C38/54C22C38/60
CPCB23K9/18B23P15/00C22C38/00C22C38/02C22C38/04C22C38/42C22C38/46C22C38/50C22C38/54C22C38/58C22C38/60
Inventor 边林昌
Owner TIANJIN TONGXINTAI STEEL PIPE MFG
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