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Causes Of Failure Of Heat-resistant Steel Castings

Jul 28, 2017

Causes of failure of Heat-resistant Steel Castings
Many users reflect the use of Heat-resistant Steel Castings will appear when the failure of the phenomenon, the failure of heat-resistant steel lead to work stagnation, efficiency and efficiency are stagnant, in order to be able to early detection and solve the problem, we summed up The reason, the following for everyone to introduce.
There are three reasons: working conditions, material, poor parts and other factors. Which conditions are different factors are the main factors. The wear mechanism of the Heat-resistant Steel Castings is very different from that of the Heat-resistant Steel Castings, such as the speed of the rotary wire, the size of the feed, the wear resistance, the sharpness and the hardness. Therefore, different specifications of the Heat-resistant Steel Castings should be based on their working conditions, the specific wear failure analysis.
At the beginning of the work, the side of the Heat-resistant Steel Castings to work on the material, the main force to impact the main way. Wear to a certain extent, the material is Heat-resistant Steel Castings face erosion and wear. Wear began, Heat-resistant Steel Castings due to impact material and the impact of the pit, the pit has residual abrasive abrasive, this deformation of the surface of the heat-resistant cast steel produced a hardening, the formation of hardening layer, the material on the hardening layer The impact produced a fatigue crack.
On the cause of Heat-resistant Steel Castings is the reason for the failure of these, the use of Heat-resistant Steel Castings must always pay attention to its dynamic, failure to meet the timely solution to avoid losses.
In order to improve the quality of Heat-resistant Steel Castings and extend the service life, sometimes by improving its temperature to improve, but since the same time prone to melt through the problem, the specific reasons and what is the solution?
First, the reasons for dissolution: the temperature is too high there will be heat-resistant steel casting problem. The higher the adiabatic temperature, the thinner the pipe wall, the prone to melt penetration problem, the aluminum heat agent filling density of 1.3g / cm, with or without adding inert additives when the thickness of 5mm occurred in the melting. System temperature is too high is the root cause of melting.
Second, the solution:
Reduce the adiabatic temperature, increase the wall thickness can avoid melting problems.
Control the preheating temperature or the thickness of the Heat-resistant Steel Castings, can be avoided by the penetration.
Understand the Heat-resistant Steel Castings occur after the reasons for melting and solutions, the need to do is the right medicine, to avoid the occurrence of similar problems.
The performance of wear-resistant steel castings has a strong relationship with industrial production applications, and therefore has a high demand for its performance.
Sometimes the same batch of factory-resistant Heat-resistant Steel Castings, the size of the existence of a deviation, largely caused by shrinkage, so determine the process parameters are the basis for the production process.
The castable shrinkage of the heat-resistant cast steel under sand casting conditions is 2.6% to 2.7%, but it varies with the size and wall thickness of the castings. The thicker the metal, the stronger the thermal effect of the metal on the mold, the less the strength of the cast material, the loss of strength to the casting shrinkage, and the casting has a greater contraction in the mold, and the shrinkage is high. Otherwise the low shrinkage value.
The larger the size of the heat-resistant cast steel, the greater the obstruction caused by the casting and the casting itself, and the less shrinkage. On the contrary simple shape of the small pieces of high shrinkage. For the wear-resistant steel should be found in the casting shrinkage value (ie, the ordinate value) multiplied by the correction factor.
The shrinkage of Heat-resistant Steel Castings is related to the size, wall thickness and structure of the castings, so these factors should be taken into account during processing.