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
View PDF4 Cites 11 Cited by
  • 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 man

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1:

[0021] The content of each element in a kind of X80 steel according to 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] A tee with a diameter of 406mm and a thickness of 15mm is made.

[0026] The production method is as follows: use steel plate reel, use high Ni welding wire after welding, use mold hot pressing forming, welding wire contains 2.5% Ni, and the forming temperature is 800℃. After the pipe is formed, the quenching and tempering process is finally adopted, and the quenching temperature is 900 ℃, tempering temperature is 520, cooling rate is greater than 15℃ / s.

[0027] Composition of welding wire mass percentage:

[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 remainder of V 0 Ti 0 B 0 is Fe.

[0032] The diameter of the welding wire is 2.0mm.

Example Embodiment

[0033] Example 2:

[0034] The content of each element in a kind of X80 steel according to 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] An elbow with a diameter of 1422mm and a thickness of 60mm is made.

[0041] The production method is as follows: use steel plate reel, use high Ni welding wire and then use mold hot pressing forming, the Ni content of the wire is 3.6%, the forming temperature is 1000 ℃, and the pipe fittings are finally formed by quenching and tempering process, the quenching temperature is 1050 ℃, tempering temperature is 650℃, cooling rate is greater than 15℃ / s.

[0042] Composition of welding wire mass percentage:

[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 diameter of the welding wire is 4.2mm.

Example Embodiment

[0048] Example 3:

[0049] The content of each element of a kind of X80 according to 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] A tee with a diameter of 800mm and a thickness of 30mm is made.

[0056] The production method is as follows: use steel plate reel, use high Ni welding wire and then use mold hot pressing forming. The Ni content of the wire is 3%, and the forming temperature is 900℃. After the pipe is formed, the quenching and tempering process is finally adopted, and the quenching temperature is 1000. ℃, tempering temperature 600℃, cooling rate greater than 15℃ / s.

[0057] Composition of welding wire mass percentage:

[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 diameter of the welding wire is 3mm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap