Year1
- 规格：
- 325*8
- 标准：
- SY5040
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) Spiral welded steel pipe for bridge piling (
) is made of thermal Rolled steel strips are rolled into pipe blanks, which are often warm-spiral formed and made by double-sided submerged arc welding or high-frequency welding. They are used for steel pipes in civil construction structures, docks, bridges and other foundation piles. The main reference standard is /(spiral welded steel pipe for piles). Main specifications: pipe diameter range, wall thickness range, length range. The spiral steel pipe for piling is a spiral seam steel pipe made of strip steel coil as raw material, extruded at regular temperature, and welded by automatic double-wire double-sided submerged arc welding process. The raw materials are strip steel coil, welding wire, and flux. They must undergo strict physical and chemical inspections before being put into use. The head and tail of the steel strip are butt-joined using single-wire or double-wire submerged arc welding. After being rolled into a steel pipe, automatic submerged arc welding is used for repair welding. Before forming, the strip steel is leveled, trimmed, planed, surface cleaned, transported and pre-bent. 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. Using external control or internal control roller forming. A 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 quality. All completed welds are inspected by an online continuous ultrasonic automatic flaw detector, ensuring 10% non-destructive testing coverage of 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. The average price of the domestic spiral pipe market fell weakly this week, with prices in some cities in East China and Central and South China generally remaining stable, while prices in other markets fell to varying degrees. After the market price of spiral pipes increased last week, the spot sales pressure of domestic spiral pipes increased this week. Coupled with the poor performance of the futures market, the prices of raw materials iron ore and billet fell, the cost support declined and the downstream demand was poor. There were many dealers. Worrying about sales, companies with advance funds dare not cooperate, and companies without advance funds are too aggressive in lowering prices. In the short term, spiral pipe manufacturers are not very active in starting operations, and the supply of new goods in local spot markets is also limited. Therefore, the inventory pressure on the entire market is limited. The latest hot coil inventory data on Friday was 0.0 million tons, a week-on-week decrease of 0.0 million tons. Industry insiders said that although the domestic spiral pipe market price has continued to fall recently, traders have not felt that sales have increased. However, the reduction in supply may lead to relatively strong selling prices for some specifications of resources, among which the selling prices of low alloy and wide coils in Shanghai are Representatives expect market prices to consolidate within a narrow range next week, with limited fluctuations. As of the close of trading this Friday, the average price of spiral pipes in all major markets across the country was RMB/ton, which was RMB/ton lower than the monthly price. The average spiral pipe price was RMB/ton, which was RMB/ton lower than the monthly price. The domestic profile market price fell slightly this week. Poor transactions were the main factor restricting the market price. Coupled with the downward trend of steel billet prices by more than RMB/ton, the market mentality weakened, resulting in a correction in prices. Looking at different cities, , prices in a small number of cities in East China have increased, but by the weekend they were no longer strong, and the markets in South China, Central South China, North China, and Northeast China fell significantly. In terms of steel mills, Maanshan Iron and Steel has introduced a mid-term refund policy. The refund policy for small-sized steel sections is RMB/ton (the same as the previous issue), the refund for large-size steel sections is RMB/ton (the same as the previous issue), and the refund for angle steel types is RMB/ton. The monthly price of section steel in Laigang will remain unchanged at the monthly listed price, and the daily listed price of section steel in the other month will be raised by RMB/ton for section steel and industrial channel steel based on the price of the previous period. Baode adjusted the ex-factory price of section steel today, with an overall decrease of RMB/ton. The reason for the inconsistent price adjustments of some steel mills lies in the different time points. As the weekend approaches, the drop in market prices and the weakening of raw material prices have led to price cuts by steel mills, while the market price in the first half of this week was relatively strong. It can be determined from this that under the dual influence of continued weakening transactions and price cuts by steel mills, the domestic steel market price may decline weakly next week. As of today, the average price of angle steel in all major markets across the country is RMB/ton, and the daily price of channel steel has decreased by RMB/ton month-on-month. The national average price of channel steel is RMB/ton. The daily price fell by RMB/ton.
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