The cast iron test samples need to be fully whitened to ensure accurate testing. During the testing of molteniron, the sampling mold must meet the requirements of rapid cooling (such as being cast into a seal like orcoin like shape) to ensure that the sample turns white; When testing finished cast iron products (usuallynon whitened samples), they need to be remelted and cast in a rapid cooling mold to ensure that thesamples are whitened.
The typical sample size is 15-80mm in diameter and 0.8-100mm in thickness. If the size is too small or toothin, suitable fixtures should be configured and the plan should be confirmed with the engineer.