Stainless steel head

In the process of shrinkage or expansion deformation and pressing of stainless steel pipe fittings with large and small head, cold or hot pressing is adopted according to different material and diameter variation of pipe fittings. Usually, cold pressing is adopted as far as possible, but hot pressing is suitable for the case of severe hardening caused by multiple diameter changes, the case of thick wall or the material of alloy steel. The tube blank with a diameter smaller than the big end of the big head is used for the expanding forming, and the tube blank is formed along the inner diameter of the tube blank by the internal punching die. The expanding process mainly solves the problem that the large size head is difficult to be formed by shrinkage. Sometimes the expanding and shrinkage methods are combined according to the forming needs of materials and products.

Because stainless steel head parts are heated and pressed into tees, the tonnage of equipment needed for material forming is reduced. Hot-pressed tees have a wide range of adaptability to materials and are suitable for low carbon steel, alloy steel, stainless steel materials; especially for tees with large diameter and thick pipe wall, this forming process is usually used. In addition to using steel pipe as raw material to produce large and small head, the Department specifications of stainless steel head can also be produced by stamping forming process of steel plate. The exterior of the drawing die is designed according to the inner surface dimension of the big and small head, and the blanked steel plate is stamped and drawn by the stamping die.

Usage: Precision cast stainless steel valve can be used in chemical industry, petroleum, metallurgy, light industry, electric power, water heating, food, medicine, fiber, ink and other industries of water, gas, steam, oil and corrosive media control.

Stainless steel small head must be kept in good time when annealing. The details are as follows:

1. We have to check the sealing performance of the furnace body, bright annealing furnace should be closed, and must be isolated from the outside air; in addition, hydrogen as a protective gas, only one outlet is through. We can use soap and water in the annealing furnace joint cracks to see if there is a phenomenon of gas escaping; the need to look at the annealing furnace into the pipe and out of the pipe where the sealing ring is particularly easy to wear, so we need to constantly check and change.

2. We should protect the pressure in the furnace to prevent micro-leakage. The protective gas in the furnace should maintain a certain positive pressure. If the protective gas is hydrogen, it usually needs to reach more than 20 kBr.

3. Check whether the annealing temperature has reached the prescribed temperature. The heat treatment of stainless steel is generally solid solution heat treatment, which is often called "annealing". The temperature range generally needs to be controlled between 1040 and 1120 C. The size of the stainless steel head in the annealing zone should be incandescent, but there is no softening sag. So here we must control the temperature, pay more attention to observation, so that we can produce good products.