How To Produce P92 Pipe Bends Two

selection of material wall thickness

Check the surface quality of the pipe and recheck the pipe number, material, diameter and wall thickness. Mark clear vertical lines on the pipes according to the

Specific requirements (including front and rear straight pipe section, angle, bending radius, etc.), mark the thickness measurement points around the pipe wall, measure the thickness of each point with the thickness gauge, according to the test

Data, make the outer arc on the thickest side of the pipe wall and mark on the pipe orifice. bending process Lift the pipe to the pipe bender, clamp the pipe and select the appropriate one

The induction ring is installed on the pipe, and the cooling water pipe and air pipe are connected. Check whether the angle dial pointer is at the zero position. If not, adjust the angle dial pointer

Make it indicate 0 °.

Since there is no crack sensitive area in P92 steel, bending should be carried out between 980 and 1020 ℃. The pushing speed of elbow is 8-20 mm / min. During bending, the bending temperature shall be monitored in the whole process to ensure the quality of bends

Quantity . When the steel pipe heating belt reaches the specified temperature, start the oil pump, turn on the forward button of the oil pump to steadily push the steel pipe forward, and make the pushing speed and heating

Speed matches. When bending, move the sensing ring from the front 50 mm of the reference position to the reference position at the set propulsion speed, and gradually slow down to ensure

The steel pipe can not fold when bending. Observe the rotation center angle indication. When the bending angle is reached, stop pushing the steel pipe and reduce the power of intermediate frequency power supply

Rate. The cooling water pump and air compressor can only be stopped after the steel pipe is cooled below 300 ℃. When the oil pump stops, move the sensing ring backward at the same speed as the set propulsion speed, and gradually slow down, so that the elbow is gradually cold

However, in order to reduce the deformation of the shutdown .

Adjust the elbow to the horizontal state, measure the structural dimension and chord length of the elbow, and calculate the actual bending angle of the elbow according to the measured data. The method of setting out can also be used for bend measurement.

heat treatment process

P92 steel needs normalizing + tempering heat treatment after bending. Normalizing temperature is 1040-1080 ℃, tempering temperature is 750-780 ℃, normalizing shall be carried out for at least 1 min (at least 20 min) per 1 mm wall thickness, and tempering shall be carried out for at least 2 min (at least 1 h) per 1 mm wall thickness. The heat treatment process curve of P92 steel elbow with id254 × 53 is shown in Figure 1.

pickling blunt chemical process

Pickling and passivation shall be carried out after heat treatment of intermediate frequency bend to ensure removal

The oxide layer produced by heat treatment forms a passivation layer on the pipe surface,

To ensure that there is no excessive rust layer inside the pipe before welding.

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