Carbon Steel Spiral Submerged Arc Welded Steel Pipe

We produce a full range of steel pipes such as seamless hot-rolled steel pipes, seamless cold-rolled steel pipes, LSAW steel pipes, spiral submerged arc welded steel pipes, stainless steel pipes, etc., to achieve full pipeline system coverage.Steel pipes have extremely strong compression resistance. After customized design, they can adapt to various intensities of internal and external pressures. They are a good choice for your industrial water extraction and drainage, gas transportation, agricultural irrigation, and construction fire water extraction and drainage.
 

Seamless hot rolled steel pipe

Production process
Tube billet preparation and inspection → tube billet heating → perforation → pipe rolling → steel pipe reheating → fixed (reduced) diameter → heat treatment → finished pipe straightening → finishing → inspection (non-destructive, physical and chemical, bench inspection) → storage

The delivery state of hot-rolled seamless steel pipes is generally delivered after heat treatment in the hot-rolled state. After the quality inspection, the hot-rolled seamless steel pipe must be strictly hand-selected by the staff. After the quality inspection, the surface should be oiled, and then followed by multiple cold drawing experiments. After the hot-rolling treatment, the piercing experiment should be carried out. , If the perforation is too large, it must be straightened. After straightening, it is transferred by the conveyor to the flaw detector for flaw detection experiment. Finally, the label is affixed, the specification is arranged, and then it is placed in the warehouse.
 

Performance advantages
It can destroy the casting structure of the steel ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent; bubbles, cracks and looseness formed during casting can also be welded under high temperature and pressure. At the same time achieve a larger caliber,The maximum nominal diameter of cold rolled pipe is 200 mm, and the maximum nominal diameter of hot rolled pipe is 600 mm.

Connection type
Welding or flange

Application area
Petrochemical industry, construction water intake and drainage, industrial water intake and drainage, high-pressure boilers, high-pressure fertilizer equipment, gas cylinder equipment, cable sleeves, high-pressure gas transmission (gas, etc.)

Seamless cold rolled steel pipe

Production process
Blank preparation → pickling and lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection

Performance advantages
Seamless steel pipes are pipelines with a hollow section and are used in large quantities for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter when the bending and torsion strength is the same. It is a kind of economical cross-section steel. At the same time, cold-rolled seamless steel pipe is shorter than hot-rolled seamless steel pipe in appearance. The wall thickness of seam steel pipes is generally smaller than that of hot-rolled seamless steel pipes. But the surface looks brighter than thick-walled seamless steel pipes. There is not much roughness on the surface, and there are not too many burrs on the caliber.

Connection type
Welding or flange

Application area
Petrochemical industry, construction water intake and drainage, industrial water intake and drainage, high-pressure boilers, high-pressure fertilizer equipment, gas cylinder equipment, cable sleeves, high-pressure gas transmission (gas, etc.)

LSAW steel pipe

Production process
1. Plate inspection: After the steel plate used to manufacture large-diameter submerged arc welded straight seam steel pipe enters the production line, the whole plate is first subjected to ultrasonic inspection;
2. Edge milling: double-sided milling of the two edges of the steel plate by an edge milling machine to achieve the required plate width, plate edge parallelism and bevel shape;
3. Pre-bending: Use a pre-bending machine to pre-bend the edge of the board, so that the edge of the board has a curvature that meets the requirements;
4. Forming: First half of the pre-bent steel plate is pressed into a "J" shape on the JCO forming machine through multiple stepping steps, and then the other half of the steel plate is also bent and pressed into a "C" shape, and finally an opening is formed "O" shape
5. Pre-welding: Join the formed longitudinally welded steel pipes and use gas shielded welding (MAG) for continuous welding;
6. Internal welding: adopt longitudinal multi-wire submerged arc welding (up to four wires) to weld on the inner side of the straight seam steel pipe;
7. External welding: use longitudinal multi-wire submerged arc welding to weld on the outside of the longitudinal submerged arc welded steel pipe;
8. Ultrasonic inspection I: 100% inspection of the inner and outer welds of the longitudinally welded steel pipe and the base materials on both sides of the weld;
9. X-ray inspection I: 100% X-ray industrial television inspection of the inner and outer welds, using an image processing system to ensure the sensitivity of flaw detection;
10. Diameter expansion: expand the total length of the submerged arc welded straight seam steel pipe to improve the dimensional accuracy of the steel pipe and improve the distribution of the internal stress of the steel pipe;
11. Hydraulic test: The expanded steel pipes are inspected one by one on the hydraulic testing machine to ensure that the steel pipe meets the test pressure required by the standard. The machine has automatic recording and storage functions;
12. Chamfering: Process the pipe end of the steel pipe that has passed the inspection to meet the required pipe end groove size;
13. Ultrasonic inspection II: Perform ultrasonic inspection again one by one to check the possible defects of the longitudinally welded steel pipe after diameter expansion and water pressure;
14. X-ray inspection II: X-ray industrial television inspection and filming of pipe end welds on steel pipes after expansion and hydraulic test;
15. Tube end magnetic particle inspection: carry out this inspection to find tube end defects;
16. Anti-corrosion and coating: Qualified steel pipes are anti-corrosion and coating according to user requirements.

Performance advantages
The production caliber can reach 1500mm

Connection type
Welding or flange

Application area
Water supply engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, for liquid transportation: water supply and drainage. Used for gas transportation: coal gas, steam, liquefied petroleum gas. For structural purposes: as piling pipes and bridges; pipes for docks, roads, and building structures.

Spiral submerged arc welded steel pipe

Production process
Spiral steel pipe is a spiral seam steel pipe made of strip steel coils as raw materials, often extruded and formed by automatic double-wire double-sided submerged arc welding.
(1) Raw materials are strip steel coils, welding wires, and fluxes. Strict physical and chemical inspections are required before investment.
(2) Butt joint of strip steel head and tail, adopt single wire or double wire submerged arc welding, after coiling into steel pipe, adopt automatic submerged arc welding to repair welding.
(3) Before forming, the strip undergoes leveling, edge trimming, edge planing, surface cleaning and conveying, and pre-bending treatment.
(4) The electric contact pressure gauge is used to control the pressure of the cylinders on both sides of the conveyor to ensure the smooth conveying of the strip.
(5) Adopt external control or internal control roll forming.
(6) The welding seam gap control device is used to ensure that the welding seam gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the welding seam gap are all strictly controlled.
(7) Both internal welding and external welding adopt American Lincoln electric welding machine for single-wire or double-wire submerged arc welding, so as to obtain stable welding specifications.
(8) The welded seams are all inspected by an online continuous ultrasonic automatic flaw instrument, which guarantees 100% non-destructive testing coverage of spiral welds. If there is a defect, it will automatically alarm and spray the mark, and the production workers can adjust the process parameters at any time according to this to eliminate the defect in time.
(9) Air plasma cutting machine is used to cut the steel pipe into individual pieces.
(10) After cutting into single steel pipes, each batch of steel pipes must undergo a strict initial inspection system to check the mechanical properties, chemical composition, fusion status of the welds, the surface quality of the steel pipes and pass non-destructive inspections to ensure that the pipe-making process is qualified. After that, it can be officially put into production.
(11) The parts with continuous sonic flaw detection marks on the weld are re-examined by manual ultrasonic and X-ray. If there are defects, after repairing, they will go through non-destructive inspection again until it is confirmed that the defects have been eliminated.
(12) The pipes where the strip steel butt welding seams and the D-shaped joints intersecting the spiral welding seams are all inspected by X-ray television or filming.
(13) Each steel pipe undergoes hydrostatic pressure test, and the pressure adopts radial seal. The test pressure and time are strictly controlled by the steel pipe hydraulic microcomputer detection device. The test parameters are automatically printed and recorded.
(14) The pipe end is mechanically processed, so that the verticality of the end face, the bevel angle and the obtuse edge can be accurately controlled.

Performance advantages
It is possible to produce welded pipes with larger pipe diameters from narrower blanks, and also to produce welded pipes with different pipe diameters from billets of the same width. The production cost is low, the process is simple, and it is easy to produce large-diameter pipes. Large-diameter welded pipes mostly use spirals. Seam submerged arc welding process.

Connection type
Welding or flange

Application area
Water supply engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, for liquid transportation: water supply and drainage. Used for gas transportation: coal gas, steam, liquefied petroleum gas. For structural purposes: as piling pipes and bridges; pipes for docks, roads, and building structures.

stainless steel pipe

Production process
a. Round steel preparation;
b. heating;
c. Hot rolled perforation;
d. Cut head
e. Pickling
f. Grinding
g. lubricating;
h. Cold rolling
i. Degreasing
j. Solution heat treatment;
k. Straighten
l. Cut tube
m. Pickling
n. Product testing.

Performance advantages
1. The stainless steel pipe has excellent mechanical properties, superior wear resistance, and a thin and dense chromium-rich oxide film on the surface, which makes the stainless steel pipe have good corrosion resistance in water including soft water, even if it is buried in the ground. It also has excellent corrosion resistance. Rusty steel pipes can withstand high-speed water erosion of up to 30 m/s. Diversion stainless steel pipes used in high-head power stations have a water velocity of more than 60 m/s at the end of the nozzle and still have a service life of more than 100 years.

2. The tensile strength of stainless steel pipes is greater than 530 N/mm, which is twice that of galvanized pipes, 3-4 times that of copper pipes, and 8-10 times that of PPR pipes, and has good ductility and toughness, which is conducive to water conservation. Resource, beautiful, clean and fashionable appearance, 100% recyclable, good safety and sanitation performance, good temperature resistance, good insulation performance, smooth inner wall, low water resistance, and can be used at -270ºC-400ºC for a long time Work safely, no harmful substances will be precipitated regardless of high temperature or low temperature, and the material performance is quite stable.

3. The heat preservation performance of stainless steel pipe is 24 times that of copper pipe, which reduces heat energy loss, is suitable for hot water transportation, does not cause environmental pollution, is green and environmentally friendly, and is conducive to sustainable development, and stainless steel waste also has great economic value. It is safe and non-toxic, no corrosion and exudation, no peculiar smell or turbidity, no secondary pollution to water quality, pure and hygienic water quality is maintained, and sanitary safety is fully guaranteed.

Connection type
Welding or flange

Application area
Water supply engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, for liquid transportation: water supply and drainage. Used for gas transportation: coal gas, steam, liquefied petroleum gas. For structural purposes: as piling pipes and bridges; pipes for docks, roads, and building structures.

 

We produce a full range of pipes and supporting pipe fittings, in line with various international standards such as DIN ISO GB ASTM BS. Full size, full caliber, full wall thickness, full package to meet your purchasing needs. For details, please consult the customer service staff, we will reply to you within 24 hours (the contact information is at the bottom of the interface, or you can directly use the communication platform provided by the website)

Q1: Where is your company? How far from the airport?

We are located at Shanghai, China, which is ONE hour driving from our factory to the airport, we can provide pick up service once you confirmed your flight information with us.

Q2: What's your warranty policy?
REHOME will guarantee the products TWO years since the date of shipment (or leaving from Seller's factory depends on the terms).
REHOME also warrantee the products can be used for 50 years.

Q3: What's your minimum order quantity?
Fittings: ONE box or ONE bag.
Pipes: 200~5000meter/size, depends on different sizes.

Q4: How about the delivery time?
The common products we always have the stock, it can be sent out within 30 days.
While the big order it takes 15 days to finish the production.

Q5: How to get free samples?
Send us your address, your telephone number, post code, and express account number to our mail box, and also told us which model of samples you need. Our sales team will contact with you within 24 hours.

Q6: What are your terms of payment?
Both the term of T/T and L/C are accepted.

Q7: I am very satisfied after I read your FAQ, how can I start to purchase my order?
Please click the "send" at the bottom of this page or contact our sales manager on Trade Mange online, thanks.

AFTER-SALES SERVICE
Newchoice focus on customer needs, all from the customer needs to meet customer needs and exceed customer expectations for service objectives.
Engineer team provide the full service, promise to offer technical service for full product life (50 years under normal service conditions)
 

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