Thick wall spiral steel pipe manufacturer

Manager Bi of Hebei Tianze Pipe Industry specializes in the production of diameter and thickness spiral steel pipes. Thick-walled spiral steel pipes are made of spiral steel pipes made of petroleum and natural gas materials. The price is low. Welcome to buy. Since the beginning of the year, due to the slowdown of the market economy, the price of spiral steel pipes has been particularly strong. . It has been rising steadily since the end of the month, and last Friday it broke through the previous shock range with a long positive line. Yesterday, the main contract of spiral steel pipe futures on the Hebei Futures Exchange closed at RMB/ton, with the highest intraday price reaching RMB/ton. Since the end of the month Having accumulated an increase of about 100,000 yuan, the next target is directly at the integer mark of tons. However, the performance of the spot market is not as strong as the futures market. Data shows that the Cangzhou Tianze Pipeline Spiral Steel Pipe Market Department's standard spiral steel pipe quotation yesterday was yuan/ton, which increased by yuan/ton yesterday. Most of the increases in other major cities are between ~ yuan/ton. New market price quotations from spiral steel pipe manufacturers According to data from the National Bureau of Statistics, the ex-factory price of industrial producers across the country increased month-on-month and year-on-year. The purchasing prices of industrial producers increased month-on-month and year-on-year. On a monthly average, the ex-factory price of industrial producers fell year-on-year, and the purchasing price of industrial producers fell year-on-year.
In terms of industrial producer prices, the price of means of production increased year-on-year, affecting the overall level of national industrial producer prices to rise by about 1 percentage point. Among them, prices in the mining industry increased, prices in the raw material industry increased, and prices in the processing industry increased. Prices of daily necessities increased year-on-year. Among them, food prices increased, clothing prices increased, general daily necessities prices increased, and durable consumer goods prices decreased. According to estimates, in the year-on-year increase in the overall level of national industrial producer prices in March, the tailing factor of last year's price changes was about 30%, and the new price increase factor was about 10%. Among the purchasing prices for industrial producers, the prices of ferrous metal materials increased year-on-year, the prices of non-ferrous metal materials and wires increased, and the prices of fuel and power increased. Manufacturing process Spiral steel pipe is a spiral seam steel pipe that is made of strip steel coils as raw materials, often warm extrusion molding, and welded by automatic double-wire double-sided submerged arc welding process
Spiral steel pipe manufacturing process
Raw materials That is, strip coil, welding wire, flux. They must undergo strict physical and chemical inspections before being put into use.
For the head-to-tail butt jointing of steel strips, single-wire or double-wire submerged arc welding is used. After being rolled into steel pipes, automatic submerged arc welding is used for repair welding.
Before forming, the strip steel undergoes leveling, trimming, edge planing, surface cleaning, transportation and pre-bending.
Electric contact pressure gauges are used to control the pressure of the cylinders on both sides of the conveyor, ensuring smooth conveying of the strip.
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The weld gap control device is used to ensure that the weld gap meets the welding requirements. The pipe diameter, offset amount and weld gap are all strictly controlled.
Both internal and external welding use American Lincoln electric welding machines for single-wire or double-wire submerged arc welding to obtain stable welding specifications.
The completed welds are inspected by online continuous ultrasonic automatic flaw detector to ensure the non-destructive testing coverage of the spiral welds. If there is a defect, it will automatically alarm and spray mark, so that production workers can adjust the process parameters at any time to eliminate defects in time.
Use an air plasma cutting machine to cut the steel pipe into individual pieces.
After being cut into individual steel pipes, each batch of steel pipes must undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion status of the welds, the surface quality of the steel pipes, and non-destructive testing to ensure the pipe making process Only after passing the test can it be officially put into production.
The areas with continuous sonic flaw detection marks on the welds will undergo manual ultrasonic and radiographic re-examination. If there are indeed defects, they will be repaired and then undergo non-destructive inspection again until it is confirmed that the defects have been eliminated.
The steel strip butt welds and the pipes where the T-shaped joints intersect with the spiral welds are all inspected by radiography or radiographs.
Each steel pipe has undergone hydrostatic pressure testing, and the pressure is radially sealed. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Test parameters are automatically printed and recorded.