UOE welded pipe,JCOE welded pipe,LSAW steel pipe,DSAW steel pipe
LSAW steel pipe is short for Longitudinal double submerge arc welding steel pipe.
JCOE means the forming process,as J shape,C shape,inner&outside welding and cold expansion after welding.Feature:Large diameter,thick wall,high pressure&low temperature resistance
There are PSL1,PSL2.PSL2 NACE for sour service in API 5L standard.
PSL2 LSAW steel pipe is more test required both seam weld,pipe body,strip/plate end weld
NACE MR 0175 require the pipe material anti sour service for LSAW steel pipe.Such as H2S gas transportation.
Special Test for NACE:
Chemical Component Analysis especially for S,P content.Hardness Vicker test usually performed.
HIC/SWC test will be carried out according to NACE TM0284.
Or if agreed in an alternative test.refer to ISO15156 Table B.3.
SSC test will be carried out according to NACE TM0177,Solution A.
A four-point bend test piece in accordance with ISO7539-2 or ASTM G39 shall be used and test duration shall be 720 hours. If agreed an alternative test accept refer to ISO15156.
The cost in china lab fees for SSC is 5 times as HIC.
LSAW Steel Pipe
API SPEC 5L PSL2 45 edition
Gr.B X42 X46 X52 X56 X60 X70 PSL2 NACE MR 0175
Black coating, bitumen coating, FBE, 3PE, 3PP, thermal insulation coated.Fiber glass coated,Epoxy
Used as oil delivery pipe in oil and natural gas industry,sour service.
Min order quality
300ton for special type
Most advanced submerged Arc Welded
According to customers’ requirement
API/ISO quality system.SGS,DNV,BV,Moody third party inspection welcomed
●Steel number: X70M
●Steel group series: MnCr 8
● Delivery status: Steel is usually delivered in hot rolled or hot forged condition. If required by the party (and indicated in the contract), it can also be delivered in the state of heat treatment (annealing, normalizing or high temperature tempering).
According to the agreement between the supplier and the buyer, the steel for pressure processing can be delivered by other finishing methods such as turning and peeling.
●X70M chemical composition range value:
Note: The actual chemical composition is in steel mill R>silicon Si: 0.17～0. br /> sulfur S:≤0.035
Phosphorus P: ≤0.035
Chromium Cr: 0.80 to 1.10
Nickel Ni: ≤0.030
Copper Cu: ≤0.030
Molybdenum Mo: ≤0.015
Titanium Ti: ≤0.020
●X70M mechanical performance range value:
Note: The actual mechanical properties are subject to the steel mill warranty.
X70M tensile strength σb (MPa): ≥ 785
X70M yield strength σs (MPa): ≥590
X70M elongation δ5 (%): ≥12
X70M section shrinkage ψ (%): ≥ 50
X70M impact work Akv (J): ≥ 47
X70M impact toughness value αkv (J/cm2): ≥ 59
X70M sample size: sample blank size is 20mm
Other information as per Mill MTC