A. During the forming process, the steel plate deforms evenly, the residual stress is small, and the surface does not produce scratches. The processed spiral steel pipe has greater flexibility in the size and specification range of diameter and wall thickness, especially in the production of high-gr

How the spiral steel pipe is sawn offAfter a series of treatments such as forming, welding, and cooling, the spiral steel pipe still needs to be sawed. In this link, the length of the technical spare ruler directly affects the quality and sales of the finished welded pipe, so the length of the spare

Slag inclusion in welded steel pipes is the slag remaining inside the weld. From theoretical analysis, the main reasons for slag inclusion in submerged arc automatic welding are as follows: ①There are many inclusions in the raw materials (including base metal, welding wire, and flux); ②The cleaning

1. Regardless of whether the straight seam steel pipe is rotated or fixed The cutting nozzle should be kept perpendicular to the surface of the straight seam steel pipe. After the cutting is completed, the cutting nozzle is gradually tilted forward at an angle of 70°-80° with the tangent line of the

Oil rose to its highest in nearly a week amid a weaker dollar and signs of improving demand in China and India. Crude futures gained 2.1% in New York, while the Bloomberg Dollar Spot Index slipped as much as 0.3%, raising the appeal for commodities priced in the currency. Meanwhile, refinery activit

3. Welding connection➤ Weld grooveAccording to the requirements of the specification, the groove is generally V-shaped, the groove angle is 60-75°, and the pairing gap is 2-3mm.➤ Weld seam pairThe number of staggered edges on the inner wall should not exceed 10% of the wall thickness and ≯2mm; the n

1. Threaded connection➤ Thread processingDivide 2-3 cuts, the thread should be clear, complete, and smooth, without burrs and messy threads. If there is a broken wire or missing wire, it shall not exceed 10% of the total number of threads. The thread should also meet the requirements of the assembly

Local media reported that the Pueblo County Department of Health and Environment confirmed that there is an active COVID-19 outbreak at the EVRAZ/Rocky Mountain Steel Mill. EVRAZ reported the outbreak to health officials on September 18. According to EVRAZ North America, three employees who work in

The wall thickness can be called a thick-walled steel pipe. There are some doubts about this. It depends on the ratio of the outer diameter of the steel pipe to the wall thickness of the steel pipe. For example, a steel pipe with a diameter of 50 mm, 10 mm can be regarded as a thick-walled steel pip

Welding inspection content includes the materials, tools, equipment, process, and finished product quality inspection used in the entire production process from drawing design to product manufacturing. It is divided into three stages: pre-weld inspection, inspection during welding, and post-weld Ins