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X80 steel, low-temperature-resistant pipe fitting manufactured from X80 steel and manufacturing method of pipe fitting

A technology of low temperature resistance and manufacturing method, which is applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of pipe fittings not having low temperature resistance, achieve toughness and plasticity improvement, high and low temperature toughness impact performance, and improve hardenability Effect

Inactive Publication Date: 2011-11-16
CNPC BOHAI EQUIP MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although patent CN100547106C discloses a kind of X80 steel, its application in pipe fittings and the manufacturing method of pipe fittings, the manufactured pipe fittings do not have low temperature resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The content of each element in a kind of X80 steel by mass percentage is:

[0022] C 0.05 Si 0.1 Mn 1.2

[0023] Ni 0.6 Cr 0.08 Cu 0.05

[0024] Mo 0.1 Nb 0.03 The balance is Fe.

[0025] Make a tee with a diameter of 406mm and a thickness of 15mm.

[0026] The production method is as follows: use a steel plate reel, use a high-Ni welding wire to weld and then use a mold for hot pressing. The welding wire contains 2.5% Ni, and the forming temperature is 800 ° C. After the pipe is formed, it is finally quenched and tempered. The quenching temperature is 900 °C, the tempering temperature is 520, and the cooling rate is greater than 15 °C / s.

[0027] Welding wire mass percentage composition:

[0028] C 0.06 Si 0.1 Mn 0.9

[0029] P 0 S 0 Ni 2.5

[0030] Mo 0 Cr 0 Cu 0

[0031] The balance of V 0 Ti 0 B 0 is Fe.

[0032] The wire diameter is 2.0mm.

Embodiment 2

[0034] The content of each element in a kind of X80 steel by mass percentage is:

[0035] C 0.1 Si 0.3 Mn 1.9

[0036] P 0.015 S 0.01 Al 0.05

[0037] Ni 3.5 Cr 0.4 Cu 0.3

[0038] V 0.05 Nb 0.1 Mo 0.35

[0039] Ti 0.02 B 0.001 The balance is Fe.

[0040] Make an elbow with a diameter of 1422mm and a thickness of 60mm.

[0041] The production method is as follows: use a steel plate reel, use a high-Ni welding wire to weld and then use a mold for hot pressing. The welding wire contains 3.6% Ni, and the forming temperature is 1000 ° C. After the pipe is formed, it is finally quenched and tempered. °C, the tempering temperature is 650 °C, and the cooling rate is greater than 15 °C / s.

[0042] Welding wire mass percentage composition:

[0043] C 0.1 Si 0.35 Mn 1.5

[0044] P 0.016 S 0.01 Ni 3.6

[0045] Mo 0.5 Cr 0.1 Cu 0.3

[0046] V 0.1 Ti 0.1 B 0.1 The balance is Fe.

[0047] The wire diameter is 4.2mm.

Embodiment 3

[0049] A kind of X80 content of each element by mass percentage is:

[0050] C 0.75 Si 0.2 Mn 1.5

[0051] P 0.008 S 0.005 Al 0.025

[0052] Ni 2 Cr 0.2 Cu 0.15

[0053]V 0.025 Nb 0.05 Mo 0.2

[0054] Ti 0.01 B 0.0005 The balance is Fe.

[0055] Make a tee with a diameter of 800mm and a thickness of 30mm.

[0056] The production method is as follows: use a steel plate reel, use a high-Ni welding wire to weld and then use a mold for hot pressing. The welding wire contains 3% Ni, and the forming temperature is 900 ° C. After the pipe is formed, it is finally quenched and tempered. The quenching temperature is 1000 °C, the tempering temperature is 600 °C, and the cooling rate is greater than 15 °C / s.

[0057] Welding wire mass percentage composition:

[0058] C 0.08 Si 0.2 Mn 1.2

[0059] P 0.012 S 0.008 Ni 3

[0060] Mo 0.25 Cr 0.05 Cu 0.15

[0061] V 0.005 Ti 0.005 B 0.0005

[0062] The balance is Fe.

[0063] The wire diameter is 3mm.

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Abstract

The invention discloses X80 steel which is composed of the following elements in percentage by mass: 0.05-0.1 of C, 0.1-0.3 of Si, 1.2-1.9 of Mn, not more than 0.015 of P, not more than 0.01 of S, not more than 0.05 of Al, 0.6-3.5 of Ni, 0.08-0.4 of Cr, 0.05-0.3 of Cu, not more than 0.05 of V, 0.03-0.1 of Nb, 0.1-0.35 of Mo, not more than 0.02 of Ti, not more than 0.001 of B and the balance of Fe, wherein Ceq is 0.39 -0.5% and pcm is 0.15-0.25%; and the invention also discloses a low-temperature-resistant pipe fitting manufactured from the X80 steel. A roll of the steel containing the above components can be manufactured into tees or elbows by welding, hot-press molding and controlling the tempering and quenching temperature. The low-temperature-resistant X80 steel pipe fitting disclosed by the invention can resist the low temperature of -45 DEG C, and is applicable to petroleum and natural gas transfer pipelines in alpine zones.

Description

technical field [0001] The invention relates to an X80 steel and a low-temperature-resistant pipe fitting made therefrom and a manufacturing method of the pipe fitting. Background technique [0002] With the development of oil, natural gas and other resources in alpine regions, various oil and gas pipelines have been started one after another, and the requirements for steel pipes are also increasing. In the stations and valve chambers in the alpine section of the Second West-East Gas Pipeline Pipeline, the lowest temperature can reach -45°C. Many station fittings need to be exposed to the cold external environment for service, requiring a large number of low-temperature resistant fittings. In the future, a large number of pipelines will be built in alpine regions, and the demand for cryogenic pipe fittings has a huge potential. Therefore, the development of cryogenic pipe fittings has a very broad market application prospect. [0003] At present, most domestic pipeline ste...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C22C38/50C22C38/48C21D9/08
Inventor 付彦宏赵志伟张海波雷庆陈延军高奔姚洪昆
Owner CNPC BOHAI EQUIP MFG
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