Beijing spiral seam submerged arc welded steel pipe Wuzhou natural gas pipeline manufacturer direct sales

  Beijing spiral seam submerged arc welded steel pipe Wuzhou natural gas pipeline factory direct sales   National standard spiral welded steel pipe for natural gas  
Cangzhou spiral steel pipe group Co
, Ltd
specializes in the production of spiral steel pipes
The sales hotline of spiral steel pipes for drainage in the spiral steel pipe factory: supply API spiral welded pipes, LSAW spiral steel pipes, double-sided submerged arc welded spiral steel pipes, Q345B spiral steel pipes, Q235B spiral steel pipes, water conservancy engineering pipes, sewage treatment pipes, small diameter spiral steel pipes, 12m spiral steel pipes, spiral steel pipe base, Yanshan spiral steel pipes, Hebei spiral steel pipes, Cangzhou spiral steel pipes, Galvanized spiral steel pipe, fixed length spiral steel pipe, 6m spiral steel pipe, 12m spiral steel pipe, API spiral welded pipe, large diameter spiral welded pipe, small diameter spiral welded pipe, pressure spiral welded pipe, spiral wound steel pipe, mud conveying spiral pipe, drainage spiral pipe, German standard spiral steel pipe, small diameter spiral steel pipe, thick wall spiral steel pipe, thin wall spiral steel pipe, Q345B spiral steel pipe, spiral steel pipe for piling, spiral wound steel pipe, spiral wound steel pipe, Spiral steel pipe for mud conveying, etc
Our company is a large-scale enterprise integrating production and processing
Hebei Cangzhou spiral steel pipe group Co
, Ltd
provides you with high-quality services
 
National standard spiral steel pipe production process  
(1) Raw materials, i
e
strip steel coil, welding wire and flux
Before being put into operation, it must undergo strict physical and chemical tests
(2) The butt joint between the head and tail of the strip steel shall adopt single wire or double wire submerged arc welding, and the automatic submerged arc welding shall be adopted for repair welding after the rolled steel pipe
(3) Before forming, the strip steel is leveled, trimmed, planed, cleaned, transported and pre bent
(4) The electric contact pressure gauge is used to control the pressure of the pressing oil cylinder on both sides of the conveyor to ensure the smooth transportation of the strip steel
(5) Adopt 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, unfitness and 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 welds are inspected by online continuous ultrasonic automatic flaw detector, ensuring 100% coverage of nondestructive testing for spiral welds
If there is any defect, it will automatically alarm and spray the mark, and the production workers will adjust the process parameters at any time to eliminate the defect in time
(9) The steel pipe is cut into single pieces by air plasma cutting machine
(10) After cutting a single steel pipe, each batch of steel pipes shall be subject to a strict first inspection system to check the mechanical properties, chemical composition, fusion condition of the weld, the surface quality of the steel pipe and the non-destructive flaw detection to ensure that the pipe manufacturing process is qualified before it can be officially put into production
(11) The parts with continuous acoustic flaw detection marks on the weld shall be rechecked by manual ultrasonic and X-ray
If there is any defect, it shall be repaired and then subjected to NDT again until it is confirmed that the defect has been eliminated
(12) The butt weld of strip steel and the pipe where the T-joint intersects with the spiral weld have all been inspected by X-ray television or film
(13) Each steel pipe is subject to hydrostatic test, and the pressure is sealed radially
The test pressure and time are strictly controlled by the microcomputer detection device for steel pipe water pressure
Test parameters are automatically printed and recorded
(14) The pipe end is machined so that the perpendicularity, slope angle and blunt edge of the end face can be accurately controlled
 
The domestic ore market has risen this week, mainly due to the recent sharp rise in billets and foreign ore, which has obviously driven the rising mentality of domestic powder merchants
Ore dressing plants and traders take advantage of the trend to ask higher prices; This week, coke and foreign mines rose sharply, mainly due to the purchase of short supply, which continuously pushed up the coke price, while foreign mines followed up the price rise
The trend of pig iron this week was stable, slightly stronger, and the transaction was average
On the whole, it is expected that the raw material price will still have room to rise again in a stable and volatile manner next week, but the billet will show a stable and volatile consolidation state
The technology of spiral steel pipe in China's high-speed rail is advancing by leaps and bounds
The country will connect major provinces and cities in China in 30 years from 2010 to 2040 to form a national network framework
Considering the reality, the line is sparse in the East; Taking care of the west, the station is scattered in the East and dense in the West
The planning and construction of all high-speed rail lines shall be centrally organized and implemented by the central government, and the operation after completion shall be under the centralized management of China High Speed Rail Corporation
In such a large pattern and environment of high-speed railway construction, as the support of high-speed railway track, special spiral steel pipe for high-speed railway bridge came into being
Beijing spiral seam submerged arc welded steel pipe Wuzhou natural gas pipeline manufacturer direct sales