Field weldability of spiral welded pipe

- Jan 29, 2019-

Features of submerged arc fastening straight seam steel pipe




What are the characteristics of submerged arc welded straight welded steel tubes?Many dealers don't seem to be aware of the assembly method of arc-welded straight seam steel pipes, and also the definition of arc-welded straight seam steel pipes isn't clear, leading to loss of orders for straight seam steel pipe dealers.Below long ma submerged arc fastening steel pipe industrial plant production department director on submerged arc welding straight seam steel pipe is what?What is that the distinction between the assembly technology of high frequency straight steel pipe and buried arc straight steel pipe?What is the difference between submerged arc welding and high frequency welding?How to differentiate high frequency and buried arc straight joint steel pipe?As well because the difference between the implementation standards of high frequency and submerged arc welded steel pipe, 


detailed rationalization is made:




What is the definition of submerged arc welded straight seam steel pipe?




The pipe body of arc-buried straight seam steel pipe encompasses a longitudinal fastening seam, and 2 fastening seams are allowed once the diameter is bigger than 914mm. Arc-buried filler is adopted for fastening, and arc-buried straight seam steel is observed as ASWL for brief to guard the fastening seam with flux.The most necessary feature of buried arc straight seam steel pipe is that the use of external fastening wire arc hot melting, and also the use of submerged arc fastening agent.






What is the distinction between the assembly technology of high frequency straight steel pipe and buried arc straight steel pipe?




The main variations between the assembly of high-frequency straight seam steel pipe and submerged arc straight seam steel pipe are the employment of various raw materials, totally different molding method, totally different fastening method, totally different production units, and totally different production vary.




Buried arc straight joint steel tube is that the narrowest 1250mm production coil plate, medium plate and medium thick plate because the stuff for production.The high frequency straight joint steel pipe takes the widest 1500mm strip steel because the production stuff.The strip is low in value.




The forming method of arc-buried straight joint steel pipe is JCOE cold stamping forming, that is characterised by gradual forming of plate with a unit of 50mm. J, C, O and E represent the forming method of arc-buried straight joint steel pipe.




High frequency straight seam steel tube forming method may be a cold forming process with multiple roller wheels, extrusion of each ends of the strip and alignment of both ends of the strip. it's characterised by uninterrupted forming method and continuous fastening.




Submerged arc fastening method is characterised by the employment of electrical heating impact of welding wire and plate along, for filler fastening.The fastening method of high frequency straight seam steel pipe is characterised by exploitation the high frequency electrical phenomenon of current to create the 2 ends of the strip heat up chop-chop during a short time and make the strip self-melt along beneath the action of external force.




High frequency straight steel pipe production unit is that the same impact line with uninterrupted assembly line, whereas submerged arc fastening straight steel pipe has up to fifteen operating procedures of intermittent production unit.




The high frequency straight joint steel pipe has fewer specifications and dilutant thickness.Buried arc straight seam steel pipe will be created in any specification of over 325 to 1600mmm and any thickness up to 80mm thick.




How to distinguish high frequency and buried arc straight joint steel pipe?




There are obvious variations in look between in-line high-frequency straight seam steel pipe and arc-buried straight seam steel pipe, that are chiefly mirrored in look and fastening seam. In look, the tube body of high-frequency steel pipe is flat and swish while not compound skin adhesion.In terms of welds, the welds of high-frequency straight steel tube are irregular saw-like welds with extrusion and jagged options. Before deed the industrial plant, such welds are "scraped" away, deed comparatively swish welds to be cleared.Buried arc-seam steel pipe has slight strip-indentation in look, that is principally distributed within the steel pipe.The fastening seam of arc-buried straight seam steel pipe is orderly and better than the welding seam of 1-3mm of the bottom metal. Before deed the industrial plant, the fastening seam will be "ground" and removed consistent with the customer's needs, and also the grinding trace of emery wheel will be left.




And the high frequency and submerged arc welded steel pipe implementation standards?




In terms of the execution customary, the 2 forms of steel tubes will execute identical execution standard: GB/ t3091-2208, GB/ t9711.1-2011, GB/ t9711.1-2001, API 5L PSL1, API 5L PSL2;However, the certification certificates of the 2 forms of steel pipes are completely totally different. The high frequency steel pipe certificate is selected for "ERW", and also the submerged arc welded steel pipe certificate is selected for "ASWL".




Cangzhou Steel Pipe cluster (CSPG) Co., Ltd


Cangzhou Steel Pipe cluster (CSPG) Co., Ltd. may be a large-sized, key scientific discipline enterprise of Hebei province in North China, whose history dates back to 1994. CSPG presently em/paces six member firms with product variable from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies a part of 600,000 sq. meters with a complete quality of $530 million.




Specialized within the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy cement mortar 2 fabric 3 oil buried pipeline IPN8710 non-toxic drinkable internal and external plastic coated lining plastic and different anti-corrosion pipe fittings for oil and gas pipeline water conservancy comes




Executive customary :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555


 


Business scope: twenty one.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners



Chemicals and Mechanical Strength


API 5L B welded steel line pipe Chemical compositions: C max 0.26% (for seamless C max is 0.28%), Mn max at 1.20%, P max at 0.030%, S max at 0.030%.
Mechanical strength yield strength min 245 Mpa, 35500 Psi; Minimum Tensile strength 415 Mpa, 60200 Psi. Same with API 5L B seamless pipe.

Grade B Supply Range

Octal supply API 5L B welded steel line pipe in below specifications:
Grade: API 5L Grade B
Outer Diameters for ERW steel line pipe: 1/2” – 20”
Outer Diameters for LSAW pipe: 16” – 56”
Outer Diameters for SSAW pipe: 16” – 100”
Range of Thickness: Schedule 10 – Schedule XXS and Schedule 160
Range of Length: 5 – 12 meter
Fixed Length: 5.8 Meter, 6.0 Meters (20FT), 11.8 Meters, 12.0 Meters (40FT)
Product Specification Level: PSL1, PSL2, Sour services
Ends: Plain, Beveled Ends, Threaded Ends
Coating Available: FBE, 3PE, Galvanized, Black Painting, Varnished, Anti-rust oil
Stock available for common sizes from 4” to 30” for API 5L B welded steel pipe in ERW and SAW.

Production Process

API 5l ssaw spiral welded steel pipe, Agriculture spirally steel pipe, 18 inch spiral seam welded steel pipe