Material of seamless steel pipe for pipeline
Material of seamless steel pipe for pipeline
Pipeline pipe: it is used to transport the oil, gas or water pumped out of the ground to the oil and natural gas industry enterprise through the pipeline pipe.
Pipeline pipe includes seamless pipe and welded pipe, and its pipe end includes flat end, threaded end and socket end; its connection mode includes end welding, coupling connection, socket connection, etc.
Purpose:
Seamless steel pipe for pipeline are used for the transportation of gas, water and oil in the oil and natural gas industry.
Standard:
API Spec 5L specification for pipeline steel pipe
GB / t9711 steel pipe for pipeline transportation system of petroleum and natural gas industry
Steel grade & Material:
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Standard
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Grade & Material
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OD
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WT
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Note
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|
API5L PSL1
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B、X42、X46、X52、X56、X60、X65、X70
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21.3-1067mm/ 1/2"-42"
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2-150mm
|
|
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API5L PSL2
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BN、X42N、X46N、X52N、X56N、X60N、BQ、X42Q、X46Q、X52Q、X56Q、X60Q、X65Q、X70Q、
X80Q、X90Q、X100Q |
21.3-1067mm/ 1/2"-42"
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2-150mm
|
|
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API5L PSL2 Appendix H
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BNS、BQS、X42NS、X42QS、X46NS、X46QS、X52NS、X52QS、X56QS、X60QS、X65QS、X70QS
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21.3-1067mm/ 1/2"-42"
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2-150mm
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Acid resistant pipe
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|
API5L PSL2 Appendix J
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BNO、BQO、X42NO、X42QO、X46NO、X46QO、X52NO、X52QO、X56QO、X60QO、X65QO、X70QO、X80QO、X90QO、X100QO
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21.3-1067mm/ 1/2"-42"
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2-150mm
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Pipe for marine environment
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GB/T9711
PSL1 |
L245、L290、L320、L360、L390、L415、L450、L485
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21.3-1067mm
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2-150mm
|
|
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GB/T9711
PSL2 |
L245N、L290N、L320N、L360N、L390N、L415N、L245Q、L290Q、L320Q、L360Q、L390Q、L415Q、L450Q、L485Q、
L555Q |
21.3-1067mm
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2-150mm
|
|
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GB/T9711
PSL2 Appendix H |
L245NS、L290NS、L320NS、L360NS、L245QS、L290QS、L320QS、L360QS、L390QS、L415QS、L450QS、L485QS
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21.3-1067mm
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2-150mm
|
Acid resistant pipe
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|
GB/T9711
PSL2 Appendix J |
L245NO、L290NO、L320NO、L360NO、L245QO、L290QO、L320QO、L360QO、L390QO、L415QO、L450QO、L485QO、L555QO
|
21.3-1067mm
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2-150mm
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Pipe for marine environment
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Note: steel pipes of other specifications can also be supplied after negotiation
Type of tempering
According to the different performance requirements of GB / t9711.1 pipeline steel pipe and the different tempering temperature, the tempering can be divided into the following types:
【1】 Low temperature tempering (150-250 ℃)
The microstructure obtained by low temperature tempering is tempered martensite. Its purpose is to reduce the internal stress and brittleness of quenched steel on the premise of maintaining its high hardness and wear resistance, so as to avoid cracking or premature damage in use. It is mainly used for all kinds of high carbon cutting tools, measuring tools, GB / t9711.1 pipeline steel pipes, rolling bearings and carburized parts. The hardness after tempering is generally hrc58-64.
【2】 Medium temperature tempering (250-500 ℃)
The microstructure obtained by medium temperature tempering is tempered troostite. The aim is to obtain high yield strength, elastic limit and toughness. Therefore, it is mainly used for the treatment of various GB / t9711.1 pipeline steel pipes and hot working dies. The hardness after tempering is generally hrc35-50.
【3】 High temperature tempering (500-650 ℃)
The microstructure obtained by high temperature tempering is tempered sorbite. The heat treatment which combines quenching and high temperature tempering is usually called tempering treatment. Its purpose is to obtain comprehensive mechanical properties with good strength, hardness, plasticity and toughness. Therefore, it is widely used in automobile, GB / t9711.1 pipeline steel pipe, machine tool and other important structural parts, such as connecting rod, bolt, gear and shaft. The hardness after tempering is generally hb200-330.
