Large-diameter seamless pipe made of X80-grade high-strength and toughness pipeline steel and method for manufacturing large-diameter seamless pipe

A technology of large-diameter and tough pipelines, which is applied in the field of large-diameter seamless pipe manufacturing to achieve the effect of reducing reheating links, good comprehensive performance and high resistance.

Inactive Publication Date: 2012-07-18
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the special performance requirements of the existing pipeline steel and the shortcomings of the processing and manufacturing method of the large-diameter seamless pipe, and provides a large-

Method used

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  • Large-diameter seamless pipe made of X80-grade high-strength and toughness pipeline steel and method for manufacturing large-diameter seamless pipe
  • Large-diameter seamless pipe made of X80-grade high-strength and toughness pipeline steel and method for manufacturing large-diameter seamless pipe
  • Large-diameter seamless pipe made of X80-grade high-strength and toughness pipeline steel and method for manufacturing large-diameter seamless pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0057] Using low C-Mn-Nb-Mo series microalloying alloy composition, the raw materials with the following chemical composition weight percentage are refined with high cleanliness:

[0058] C: 0.01%, Mn: 1.50%, Si: 0.20%, S: 0.001%, P: 0.01%, Nb: 0.03%, Ti: 0.005%, V: 0.04%, Al: 0.030%, N: 0.0050%, Mo: 0.05%, Cu: 0.10%, Ni: 0.05%, Cr: 0.10%, Ca: 0.001%.

[0059] Refined molten steel is centrifugally cast into a hollow billet of F820×130mm, and the two ends of the hollow billet are fixed with carbon steel as the bite head and tail end parts. The length of the bite head is 300mm, and the round part of the tail end is F720× 30mm×600mm, the outer surface of the carbon steel at the head end is processed into a taper of 1:1.5, the inner and outer surfaces of the tube blank and the carbon steel end are machined, and the inner and outer surfaces are cut by 5mm and 2mm respectively to obtain a carbon steel section at both ends The size of the tube blank is F802×112×1980mm. Heat the abo...

Embodiment 2

[0061] Using low C-Mn-Nb-Mo series microalloying alloy composition, the raw materials with the following chemical composition weight percentage are refined with high cleanliness:

[0062] C: 0.03%, Mn: 1.75%, Si: 0.25%, S: 0.0020%, P: 0.012%, Nb: 0.05%, Ti: 0.01%, V: 0.06%, Al: 0.040%, N: 0.0080%, Mo: 0.20%, Cu: 0.30%, Ni: 0.15%, Cr: 0.30%, Ca: 0.004%.

[0063] Refined molten steel is centrifugally cast into a hollow billet of F850×135mm, and the two ends of the hollow billet are fixed with carbon steel as the bite head and tail end parts. The length of the bite head is 400mm, and the round part of the tail end is F740× 35mm×750mm, the outer surface of the carbon steel at the front end is processed into a taper of 1:2.4, the inner and outer surfaces of the tube blank and the carbon steel end are machined, and the inner and outer surfaces are cut by 6mm and 2mm respectively. The size of the tube blank with carbon steel sections at both ends is F830×113×2000mm. The above-menti...

Embodiment 3

[0065] Using low C-Mn-Nb-Mo series microalloying alloy composition, the raw materials with the following chemical composition weight percentage are refined with high cleanliness:

[0066] C: 0.050%, Mn: 2.00%, Si: 0.30%, S: 0.0030%, P: 0.015%, Nb: 0.08%, Ti: 0.03%, V: 0.08%, Al: 0.050%, N: 0.010%, Mo: 0.50%, Cu: 0.50%, Ni: 0.35%, Cr: 0.50%, Ca: 0.006%.

[0067]Refined molten steel is centrifugally cast into a hollow billet of F860×140mm, and carbon steel is fixed at both ends of the hollow billet as the biting head and tail end parts. The length of the biting head is 500mm, and the round part of the tail end is F750 ×40mm×900mm, the outer surface of the carbon steel at the front end is processed into a taper of 1:3.1, the inner and outer surfaces of the tube blank and the carbon steel end are machined, and the inner and outer surfaces are cut by 6mm and 3mm respectively. The size of the tube blank with carbon steel sections at both ends is F840×120×2100mm. The above-mentione...

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PUM

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Abstract

The invention aims to meet the special performance requirements of the existing pipeline steel and overcome the defect of a processing and manufacturing method of a large-diameter seamless pipe, and provides the large-diameter seamless pipe made of X80-grade high-strength and toughness pipeline steel to meet the requirement of an oil and gas delivery pipe used in the complex environment such as low-temperature, corrosion and the like in polar region. The method for manufacturing the large-diameter seamless pipe comprises the following steps: pouring alloy refining molten steel and centrifugally casting to obtain a large-diameter pipe blank; connecting head and tail ends of the pipe blank with carbon-steel circular parts, and grinding and machining the inner surface and the outer surface of the whole pipe blank; heating and removing scale; inserting a mandril into the hollow pipe blank, and positioning; delivering the pipe blank to a periodic rolling machine, and rolling the pipe blank in a reciprocating way to obtain the pipe with a required size; removing the mandril, and cutting off the head and the tail; and heating, sizing and finishing to obtain the finished pipe fitting with the qualified size. The X80 pipeline steel and the manufactured seamless pipe are excellent in comprehensive mechanical properties and particularly excellent in low-temperature impact toughness, and the X80 pipeline steel is suitable for the high-strength and toughness and corrosion resistant large-diameter delivery pipe used in the alpine-cold environment.

Description

technical field [0001] The invention relates to a high-strength steel seamless pipe for oil and gas transportation and a manufacturing method thereof, and is especially suitable for manufacturing large-diameter seamless pipes with high strength, high toughness and low temperature resistance. Background technique [0002] Pipeline transportation is an important way to transport oil and gas from remote mining sites to end-users over long distances. For a distance of less than 5,000 kilometers, pipeline transportation of oil and gas is the most economical means compared with other transportation methods. Compared with other methods, pipeline transportation has the advantages of large transportation volume, low cost, high safety, convenience and high efficiency. The increase in delivery pressure requires an increase in the wall thickness of the steel pipe, which will inevitably lead to an increase in the weight of the steel pipe. In this case, only by increasing the steel grad...

Claims

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Application Information

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IPC IPC(8): B23P15/00C22C38/58
Inventor 李永胜陈光
Owner NANJING UNIV OF SCI & TECH
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