steel tube

    Major technical characters of LSAW Steel Pipe     1. During the forming process, the deformation of the plate is very uniform and the residual stress is very low and there is less scratch on the surface. The production range on the wall thickness and pipe diameter is very flexible. For the high strength material with small pipe diameter and heavy wall thickness this process has more advantages than other pipe production process. More requirements on the product range from customers can be met.     2. The welding can be performed at an optimal position so the welding quality is easy to control because the inside welding and outside welding are performed after the tack welding. The welding defects such as the offset, deflection and lack of penetration are very seldom to occur.     3. The full-length mechanical expansion of the pipe can effectively increase dimension precision and improve the internal stress distribution of the steel pipes,...

    Duplex stainless steel pipe has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel, it is not like the heat-affected zone of welding of ferritic stainless steel. The plastic toughness is greatly reduced due to the severe coarsening of grains. It is also not as sensitive to welding hot cracks as austenitic stainless steel.     Due to its special advantages, duplex stainless steel is widely used in petrochemical equipment, seawater and sewage treatment equipment, oil and gas pipelines, paper machinery, and other industrial fields. In recent years, it has also been researched and applied to the field of bridge load-bearing structures, and has very good development prospects.     Duplex stainless steels have a ferrite phase and an austenite phase half of each in the solid-quenched structure. Generally, the minimum phase content may reach 30%.     http://www.xysteelpipe.com/info/Duplex-stainless-st...

    Galvanized Steel are those steel that has been covered with a layer of zinc metal. In the production process and packaging process of hot dip galvanized, the appearance of hot dip galvanized steel strip and steel plate may occur following defects.     The excess liquid zinc from galvanized pot on the strip surface, which excess liquid zinc air knife blow to control the zinc coating thickness. Gas pressure of the air knife, air knife and strip pitch, strip speed will directly affect the thickness of the zinc layer. If the lack of supply instability of the air knife or air knife pressure can cause the accumulation of zinc coating.     Purity of zinc coating is not enough, the original board surface dirt eclipse biological treatment is not sufficient and form the residue when copper, iron, arsenic and other impurities is higher levels of zinc coating. galvanized uncoated can easily lead to the surface of the steel dark spots. Galvanized steel surface e...

    ERW pipe is a pipe formed by electric resistance welding. Unlike seamless steel pipe,it has a welded joint in its cross section. Since the process involved in the production of ERW steel pipe is very sample, the production efficiency is greatly increased and production cost is effectively reduced. This contributes to the lower prices of ERW steel pipe. As a result this type of steel pipe is increasingly used for water and gas conveyance, structural and engineering purposes.     Product Description:     1) Varieties: SGP, SCH 20, STD, SCH40, SCH80, SCH160, XS, XXS     2) Standard: API, ASME, B36.10M 1996, JIS, DIN, GB8162, GB8163, GB5310     3) Material: ASTM 5L, ASTM A53, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672, EN 10217     4) Size: Out Diameter:1/2"-24";Wall Thickness: 1.65-20mm; Length: 3m-12m     5) Surface treatment: Black rust-proof oil, transparent oil, hot galvani...

    1. wave reflection method, in the state where the relative movement of the probe and a high pressure boiler tubes automatic inspection, the only special large-diameter seamless cam manual inspection. Automatic or manual inspection should ensure the sound beam scanning the surface of all of seamless steel pipe.     2. longitudinal defect inspection acoustic beam in the tube wall along the circumferential direction of propagation; test transverse defects propagation direction of the acoustic beam in the tube wall along the tube axis. The longitudinal and transverse defect inspection should be carried out in two opposite directions on the tube.     3. In demand-side transverse defect inspection is not made for the party inspection of longitudinal imperfections. Both parties agree that the buyer and the seller, the inspection of longitudinal and transverse defects can be only in the direction of the tube.     4. Automatic or manual inspectio...