P11 elbow

P11 is a low alloy heat-resistant steel

When P11 elbow is processed, the temperature in the metal deformation area rises during extrusion, so the temperature in the brittle area of some alloys will cause cracks, which greatly hinders the production of P11 elbow. During rolling, the finished elbow is deformed due to relatively small deformation and friction. In addition, P11 elbow is easy to be damaged when it rises from the plastic zone to the brittle zone due to temperature during production. In this process, the temperature should be strictly controlled and some auxiliary processes should be combined for production. Therefore, the production speed of P11 elbow is slow

P11 elbow include flame heating and reflective surface heating. And medium frequency or high frequency induction heating. The specific selection depends on the production standard of P11 elbow

Extrusion tools used for material processing and manufacturing have low price and good heat resistance, so the cost of extrusion products can be ignored. According to relevant information, extrusion process is a practical and innovative way to produce thin-walled pipes

Extrusion forming has become the main form of carbon steel and alloy steel elbow. This process is relatively special, and punching the die set in the front movement of raw materials. During stamping, the diameter and sawtooth shape of the elbow are heated and then formed

Stamping forming alloy mass production elbow is first used in bending alloy forming process. It is replaced by the hot forming process commonly used in the production of standard elbows. However, due to low production, some standard P11 elbows are too thick or thin

P11 elbow correction:

1. P11 elbow is corrected by static load, which is generally not suitable for local knocking

2. After correcting P11 elbow, stress relief annealing shall be carried out at a temperature lower than the original tempering temperature

P11 elbow quality inspection:

1. P11 elbow shall be inspected according to the items and requirements specified in the corresponding technical documents

2. When the mechanical properties of P11 elbow are unqualified, the heat treatment can be repeated, but the number of times of repeated quenching or solution is usually not more than two. Supplementary tempering of workpieces shall not be regarded as repeated treatment

3. P11 elbow in quenching state or after low temperature tempering shall be preheated, annealed or high temperature tempered before repeated quenching

4. The original records of heat treatment shall be properly kept for future reference

P11 elbow cleaning:

2. P11 elbow is usually not cleaned by pickling