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UOE welded pipe with excellent deformability and manufacturing method thereof

A manufacturing method and technology for welded pipes are applied in the field of welded pipes and their manufacturing to achieve the effect of improving plate shape and excellent mechanical properties

Pending Publication Date: 2021-12-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent mainly focuses on the pipe-making process technology, and only mentions the composition design of the raw material steel plate, mainly adopts the composition design method of high Mn and Cr alloying, and does not involve related process design

Method used

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  • UOE welded pipe with excellent deformability and manufacturing method thereof
  • UOE welded pipe with excellent deformability and manufacturing method thereof
  • UOE welded pipe with excellent deformability and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0088] The UOE welded pipes with excellent deformability in Examples 1-8 were all prepared by the following steps:

[0089] (1) Smelting and casting according to the chemical composition shown in Table 1: After smelting-LF+RH refining-continuous casting and other processes, a continuous casting slab with a thickness of 300-400mm is obtained;

[0090] (2) Heating: Control the slab heating temperature to 1070-1170°C;

[0091] (3) Rolling: Control the finishing temperature of rough rolling to 950-1050°C, the thickness of the intermediate billet to 3t-7t, where t represents the wall thickness of the steel pipe, and control the finish rolling temperature to 730-820°C;

[0092] (4) Air cooling + DQ cooling: control the start cooling temperature of DQ cooling to 640-690°C, control the final cooling temperature of DQ cooling to 100-350°C, and control the cooling rate of DQ cooling to 25-45°C / s;

[0093] (5) Pipe making: the steel plate is sequentially subjected to C forming, U formin...

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Abstract

The invention discloses a UOE welded pipe. The UOE welded pipe comprises Fe and further comprises the following chemical elements including, by mass percent, 0.03-0.08% of C, 0.1-0.4% of Si, 1.2-1.7% of Mn, 0.31-0.60% of Ni, 0.11-0.35% of Cr, 0.02-0.08% of Nb, 0.005-0.035% of Ti, 0.001-0.004% of Ca and 0.010-0.045% of Al. In addition, the invention further discloses a manufacturing method of the UOE welded pipe. The manufacturing method comprises the steps of (1) smelting and casting; (2) heating; (3) rolling; (4) air cooling and DQ cooling; and (5) pipe manufacturing, wherein a steel plate is sequentially subjected to C forming, U forming and O forming to obtain a slotted steel pipe, and then welding and diameter expanding are carried out on a welding seam. The O forming compression ratio is controlled to be 0.18-0.22%, the diameter expanding rate is controlled to be 0.8-1.2%, the welding heat input is controlled to meet the following condition that 1.7 t<=H<=2.2 t, the numerical value of the weld heat input in the unit of KJ / cm is substituted into the formula as H, and the numerical value of the wall thickness of the steel pipe in the unit of mm is substituted into the formula as t. The UOE welded pipe has high strength, high toughness and good deformability.

Description

technical field [0001] The invention relates to a material and a manufacturing method thereof, in particular to a welded pipe and a manufacturing method thereof. Background technique [0002] Offshore oil and gas resources are very rich. In the process of exploiting offshore oil and gas resources, submarine pipelines are an important way to undertake offshore oil and gas transportation. Unlike land pipelines, the harsh construction and service environment on the seabed put forward stricter requirements for line pipes. [0003] Submarine pipeline construction is usually laid in J-shape or S-shape, and it needs to bear large plastic deformation under the premise of bearing a large self-weight. Submarine pipelines need to withstand large seawater extrusion during service, and steel pipes with higher thickness-to-diameter ratio (t / D) and ellipticity are required to improve the crushing performance, while crossing gullies and overcoming harsh conditions such as fluid movement. e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/48C22C38/50C22C38/06C22C38/44C22C38/42C21D8/02B21C37/08
CPCC22C38/02C22C38/04C22C38/58C22C38/48C22C38/50C22C38/06C22C38/44C22C38/42C21D8/0226B21C37/08C21D2211/005C21D2211/002
Inventor 章传国孙磊磊李龙王波吴扣根谢仕强郭胜
Owner BAOSHAN IRON & STEEL CO LTD
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