Seam tube manufacturing

- Jul 17, 2020-

Seam tube manufacturing

Longitudinal seamt is the oldest manufacturing orocess, which begins from a sheet of sheet metal (which is acquired by way of windine a steel coil until the preferred thickness is achieved) cut consistent with the width that corresoonds to the size of the tube with a view to be oroduced. Thissheet is folded by means of rollers to join the ends longitudinally to attain the form of the tube. Depending on the separation of the rollers, distinct curves and consequently exclusive tube diameters are acquired. Welding seals this be a part of straight to close the cvlinder in a chemically neutral environment.Helical welding (or spiral)This tube production process follows the equal technique as that of the lonpitudinallv welded tube with the difference that the weld snirals the entireeneth of the tube diameter as if it have been threaded rather than straight inside the longitudinal ioint of the sheetTo hide the weld, a hot remedy procedure may be aoplied to the welded tube to forge it, and then skip throuch lathes to shine the seam and make it almost.Iminnssible to nerreive with the bare eve Keen in mind that wnelding is the wpakest nart of the tuhe and could mark the mayimum stress it is able to withstandlThe price of sewn pioes is usually lower than that ofthe seamlesstube since much less stretching and temperine is needed and the manufacturine time. therefore, is also generally much less.            

Product Description
Product Name
welded spiral steel pipe
Q235A, Q235B, Q345, L245, L290, API5L X42,X52,X60,X70,X80, OCr13,1Cr17,00Cr19Ni11,1Cr18Ni9,0Cr18Ni11Nb,ST37.0,
ST35.8,ST37.2,ST45,ST52,ST52.4,STP G38,STP G42,STPT42,STS49, etc...
SY/T5037-2000, GB/T9711.1-1997, GB/T9711.2, API-5L, SY/T5040-92, ASTM A53,A106, DIN1626,DIN1629,DIN2448,JIS G3452,JIS G3454,JIS
G3455, JIS G3456,JIS G3457,JIS G3461
Mainly used in water engineering, petroleum and natural gas industry, chemical industry, agricultural irrigation, urban
1. Payment terms : T/T ,L/C 2. Terms of trade : FOB ,CFR,CIF ,DDP,EXW
3. Minimum order : 2 tons
4. Delivery time : Within 25 days.
5000Tons per month.
GB/T9711.1 GB/T9711.2 SY/T5037 SY/T5040 API5L
In bundles, Painting, Beveled edges, plastic caps ends, or as buyer's request.
The pipes are widely used in natural gas, offshore oil piling, petroleum, chemical
After sale service
We do what we promised ,We promised what we will do .
The spiral steel pipe is a spiral seam steel pipe with a steel coiled plate as a raw material, which is often extruded and formed by welding with an automatic double-wire submerged arc welding process. The spiral steel pipe feeds the strip steel into the welded pipe unit, and after being rolled by multiple rollers, the strip steel is gradually rolled up to form a round tube blank with an open gap. 3mm, and make the two ends of the welding port flush.
Material Q235A, Q235B, 10 #, 20 #, Q345 (16Mn), L245 (B), L290 (X42), L320 (X46), L360 (X52), L390 (X56), L415 (X60), L450 (X65), L485 (X70), L555 (X80) L290NB / MB (X42N / M), L360NB / MB (X52N / M), L390NB / MB (X56N / M), L415NB / MB (X60N / M), L450MB (X65), L485MB (X70), L555MB (X80) .
Production process
(1) The raw materials are strip coil, welding wire and flux. Before input, it must undergo strict physical and chemical tests. (2) The head and tail of the steel strip are connected by single-wire or double-wire submerged arc welding. After being rolled into steel pipes, automatic submerged arc welding is used for welding. (3) Before forming, the strip steel is leveled, trimmed, planed, surface cleaned and transported, and pre-bent. (4) The electric contact pressure gauge is used to control the pressure of the oil cylinder on both sides of the conveyor to ensure the smooth transportation of the steel strip. (5) Using external control or internal control roll forming. (6) The weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the weld gap are strictly controlled. (7) Both internal and external welding adopt American Lincoln electric welding machine for single-wire or double-wire submerged arc welding, so as to obtain stable welding quality. (8) All welded seams are inspected by online continuous ultrasonic automatic flaw detector to ensure 100% coverage of non-destructive testing of spiral welds. If there are defects, it will automatically alarm and spray marks, and the production workers will adjust the process parameters at any time according to this, and eliminate the defects in time. (9) Use air plasma cutting machine to cut the steel pipe into single pieces. (10) After cutting into a single steel pipe, each batch of steel pipes must undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion state, surface quality of the steel pipe and non-destructive inspection to ensure the qualification of the pipe making process Only then can it be officially put into production. (11) The parts with continuous sonic flaw detection marks on the welding seam are manually reviewed by ultrasonic and X-ray. If there are defects, after repairing, they will undergo nondestructive inspection again until it is confirmed that the defects have been eliminated. (12) Tubes with butt-welded welds of steel strips and D-joints that intersect spiral welds are all checked by X-ray TV or filming. (13) Each steel tube undergoes a hydrostatic pressure test, and the pressure is radially sealed. The test pressure and time are strictly controlled by the steel pipe hydraulic microcomputer detection device. Test parameters are automatically printed and recorded. (14) Mechanical processing of the pipe end, so that the verticality of the end face, the bevel angle and the blunt edge are accurately controlled
Company Profie
Hui Yuan is a trading company established based on Liaocheng Development Zone Jinyun Steel Pipe Co., Ltd. The factory has more than ten years of professional production experience .Now we have cold rolled seamless steel pipe 12 production lines and hot rolled seamless steel pipe 1 production line,one more hot rolled seamless steel pipe production line is under construction

Our main products are listed as follows: Hot Rolled steel pipe, Precision Cold Rolled steel pipe, Cold Drawn steel pipe, alloy steel pipe, bearing steel pipe, spiral pipe, galvanized pipe,Honed tube,special shape steel pipe.etc.

Our company adheres to the business philosophy of exceeding customer expectations and fulfilling employees' dreams, and keeps making progress to provide customers with reliable products and services.

Our products have been exported to Germany, South Korea, Russia, Malaysia, Pakistan, Thailand, India, Ukraine and other countries and regions. We sincerely welcome friends from all over the world to contact us and establish mutually beneficial business relations.

1. Q: Are you a factory or a trading company?
A: We not only have our own factories but also have shares in some other enterprises.
2. Q: Can you provide samples?
A: Yes, if the sample is available in stock.
3. Q: Can you arrange the shipment?
A: Sure, we have permanent freight forwarder who can gain the best price from most ship company and offer professional service.
4. Q: What is the delivery time?
A: It is based on the order, normally 15 - 20 days after receiving the deposit or L/C at sight.
5. Q: Do you have quality control?
A: Yes, we have gained BV, SGS authentication.
6. Q: What are your payment terms?
A: 100% irrevocable L/C at sight. Or T/T, 30% advance, and balance against the copy of B/L within 3-5 days.
7.Q: What is your MOQ?
A: 10 tons for common size, or mix sizes for a 20 GP container.