Titanium Clad Steel Plate For Equipment

One is all-titanium equipment that can withstand both medium pressure and medium corrosion; The other is that the medium pressure is borne by the shell material, and the titanium material only bears the medium corrosion. The second type of structure is divided into titanium lining structure and titanium-steel composite plate equipment according to the combination and connection methods of titanium lining and shell. Titanium lined equipment is suitable for situations where there is no internal and external heat exchange, and there will be no sudden pressure drop or severe temperature changes and frequent load changes. Titanium steel clad plate equipment can be used in a wider range of temperature and pressure, and can also be used in situations where local stress conditions such as vacuum or equipment internals need to be fixed on the lining are poor. Based on the consideration of economy and processing and manufacturing factors, the structural form of titanium-steel composite plate is widely used in practical applications. The weld structural form of titanium-steel composite plate equipment should be strictly prevented from the possibility of mutual dissolution of titanium and shell materials (i.e., the cladding and base layer of the composite plate) when the lining is welded in the equipment, so as to prevent the iron metal from dissolving in the titanium weld, forming hard and brittle intermetallic compounds, and seriously reducing the weld plasticity and corrosion resistance.

The structures of longitudinal and circumferential welds and leak detection holes shown in Figure 1 and Figure 2 are commonly used by manufacturers at present. The structural titanium base plate shown in Figure 1 is floating, and the medium can be detected through the leak detection hole in case of leakage.

In the structure shown in Figure 3, the titanium base plate and the Titanium Clad Steel Plate for equipment are welded together. The leak detection tube is made of titanium and connected with the titanium - steel composite plate base and the titanium base plate by threads, so that the media that may leak is completely isolated from the titanium - steel composite plate base. Even if there is leakage, it will not cause damage to the titanium - steel composite plate base. This structure can be used if there is a high requirement for medium leakage.

The flange is mostly made of titanium ring as the sealing surface (or fastened with titanium screws) and welded with the titanium liner inside the nozzle, and then welded with silver brazing outside. The silver brazing structure on the outside of the titanium ring makes a closed cavity between the titanium lining and the steel base to facilitate the gas tightness or ammonia leakage inspection. There are also structures that use glue instead of silver brazing, but the use effect is not very good, so it is not recommended to use glue instead of silver brazing. Generally, the structure that only uses silver brazing without titanium screw has poor impact resistance, and the silver brazing part is easy to leak, so it is not recommended to use the structure without titanium screw fastening. The titanium screws for fastening are generally M8 or above countersunk screws. The size and quantity of the screws are determined according to the size of the sealing ring. After the screws are fastened, the head is sealed by argon arc welding, and the sealing surface is finally machined. The general structure is shown in Figure 4.