The advantage of a compact spiral pipe is that only a thin layer of side melts, which allows the extrusion of oxides and impurities to provide a pure, high quality weld. Side-by-side, spiral tube manufacturer oxide can be squeezed along two deflections.

Spiral stacking is conducive to the protection of the quality of the spiral steel pipe to extend the service life of spiral steel pipe to prevent deformation, erosion, spiral pipe orderly piled up, but also conducive to the latter spiral pipe loading, inventory. Spiral pipe buyers should also be strictly in accordance with the requirements of spiral steel pipe pile.

Spiral Pipe Production Test Process Analysis

Spiral pipe welding head

Spiral common defect detection method

Spiral steel pipe anti-corrosion measures and procedures are as follows: Fluid spiral corrosion requirements are different from other domestic projects, the main difference is:

Spiral broken steel and metal materials according to the material is basically the same divided into three types, damage: ① cleavage fracture, ② tie cave animals anti-fracture, ③ slip surface fracture separation.

Spiral steel pipe into the steel unit, multi-roll rolling strip gradually rolled up, and the formation of a gap with the open tube, squeeze roll to reduce the adjustment, weld gap control in 1 ~ 3mm, the weld flat.

Spiral steel pipe into the steel unit, multi-roll rolling strip gradually rolled up, and the formation of a gap with the open tube, squeeze roll to reduce the adjustment, weld gap control in 1 ~ 3mm, the weld flat. 1. If the gap is too large, resulting in reduced proximity effect, lack of eddy current, poor weld crystallization, indirect fusion or cracking bad. 2. The gap is too small, resulting in increased proximity effect, excessive welding heat, causing the weld to rupture; weld or extrusion, the formation of pit after rolling, affecting the weld surface quality.

Magnetic particle inspection or penetration testing can effectively detect surface cracks, folds, serious leather surface defects, hair lines, pinholes. For ferromagnetic materials, magnetic particle inspection method with high sensitivity, priority should be given to magnetic particle inspection; for non-ferromagnetic materials, such as stainless steel seamless pipe, penetrant flaw detection method.

Deformed mold complex is often complicated, but as long as we grasp the deformation laws, analyze the causes, the use of different prevention methods is to reduce the deformation of the mold, and can control it. In general, precision mold hot deformation can be taken in the following ways to prevent.

Squeeze forging, rolling method is the difference: 1, precision seamless extrusion heating temperature than forging, rolling high 30-60 ℃; 2, deformation, high-speed (rebar, only 2-4s). 3, multi-step, high consumption of meta

Squeeze forging, rolling method is the difference: 1, precision seamless extrusion heating temperature than forging, rolling high 30-60 ℃; 2, deformation, high-speed (rebar, only 2-4s). 3, multi-step, high metal consumption.

Precision light pipe passivation pickling, degreasing, ordinary precision three light tube surface treatment process.

Deformed mold complex is often complicated, but as long as we grasp the deformation laws, analyze the causes, the use of different prevention methods is to reduce the deformation of the mold, and can control it. In general, precision mold hot deformation can be taken in the following ways to prevent.

In the case of hot-rolled seamless pipes, cold-rolled seamless pipes are made below the recrystallization rolling temperature, but hot-rolled seamless pipes are rolled or subjected to recrystallization temperatures.

Squeeze forging, rolling method is the difference: 1, precision seamless extrusion heating temperature than forging, rolling high 30-60 ℃; 2, deformation, high-speed (rebar, only 2-4s). 3, multi-step, high consumption of metal.

Precision light pipe passivation pickling, degreasing, ordinary precision three light tube surface treatment process.

Some high-strength martensitic stainless steels, high-speed tool steels, and high-strength alloy steels, due to their high hardenability and alloying element strengthening. Often tempering (or tempering) after high temperature tempering, the steel carbide is properly aggregated to obtain coarse particles of carbide tempered sorbite (with spheroidizing annealing organization, and so on) state delivery plate has good The cutting performance is delivered directly after cooling, called hot rolling or forging, after hot rolling or forging and without special heat treatment. Hot (forging) termination temperature is generally 800-900 ℃, the air is generally naturally cooled, so hot (forging) state is equivalent to normalizing. And strictly normalizing heating temperature control, due to the hot (forging) the end of the temperature caused by the difference. So that the vibration ratio of steel, microstructure and properties have been well improved.

According to the report, the Japanese finance ministry announced in December 22nd that the temporary anti-dumping duties on steel and steel parts from China and South Korea were levied. The temporary anti-dumping duties began to be levied since December 28th for 4 months. The tax rate is between 41.8%~69.2%. This is the second time in Japan to levy anti-dumping duties on Chinese steel products in 2017, which is rare in 1 years.

On January 22, the Canadian Border Services Agency (CBSA) issued a public notice to initiate a double anti-sunset review of the seamless Casing originated in or imported from China. The customs codes of the products involved are 7304.29.00.11, 7304.29.00.19, 7304.29.00.21 and 7304.29.00.29. This sunset review of the questionnaire should be submitted by February 28, 2018. The Canadian Border Service will make a ruling on this sunset review by no later than 21 June 2018.