Bending and welding properties of heat-resistant castings

- May 12, 2018-

The technological properties of heat-resistant castings during operation mainly include bending properties, tube flattening properties, forging properties, torsion properties, pipe flaring properties, pipe hydraulic properties, punching properties, welding properties and so on.


Bending properties of heat-resistant castings


In the process of making heat-resistant castings, the metal materials can withstand the ability of bending without breaking at room temperature, and the more effective bending degree can be withstood before the cracking occurs during operation, the better the bending properties of the materials will be. The bending degree is usually expressed by the ratio of bending angle or core diameter to material thickness. The greater the bending angle or the ratio of core diameter to material thickness is, the better the bending performance of the material is.


Forging Properties of Heat-Resistant Castings


The ability of metal materials made of heat-resistant castings to withstand hammering and forging and other top deformation is called forging property in operation. When the test is carried out, the cold forging test is carried out at normal temperature, and the hot top forging test is carried out in the range of forging temperature. The specimen should be forged short to the specified length (usually 1 / 3 or 1 / 2 of the original length). After forging, the test side should be inspected, if there is no crack, pulling slope, bubble, etc., shall be considered qualified.


Torsional properties of heat-resistant castings


During the torsional test, the metal wire of the heat-resistant casting effectively tests the ability of the metal wire to bear the plastic deformation when it is unidirectional or alternating direction and shows the uniformity of the material, the surface and the internal defects.


Tube flattening Properties of Heat-Resistant Castings


The metal tube was flattened to a specified size to test its plastic deformation ability. The flattening performance of the tube was expressed by flattening distance in units of mm. Check the bending deformation after the test, if there is no crack, the crack is considered qualified.


Welding properties of heat-resistant castings


Metal has the ability to adapt to common welding methods and welding process. Metal materials with good weldability are easy to be welded by common welding methods and welding processes. Metal materials with poor weldability must be welded by specific welding methods and welding processes. The weldability of metal is generally judged according to the sensitivity of cracks and the change of mechanical properties in weld zone.