About casting quality control, to ensure the perfect products. We through the below process:
Molten iron test report. Test C, Si, Me, S, P etc 31 elements to ensure the quality of the molten iron.
Semi-finished test report. We use the metallographic microscope to carry on metalloscope analysis for the casting products. To ensure the spheroidal graphite classis qualified. All products are subject to manual inspection.
Finished product test report, including coating inspection, and bolt and nut inspection, these are random inspections
Molten iron Test
This is a spectrum analyzer imported from Germany and it can analysis 31 chemical elements of the molten iron. We will test every furnace of molten iron. We will make special samples to test the quality of the molten iron. After testing, if qualified, we will take the molten iron to the casting procedure. We will keep record for each testing.
We use the metallographic microscope to carry on metalloscope analysis for the casting products. Usually for one furnace of molten iron is divided into 5~6 batches. We will test the samples of the casting products taken from the last batch. If they are qualified, products from the furnace are all qualified. If not, we will track the casting products according to the tracking no. until the qualified ones. We will keep the testing record and samples for at least 3 years.
For the gaskets, we will carry on aging test, tension test, yield strength test, elongation test etc. to ensure the quality of gaskets. (For the aging test, it is 70 hours under 125℃）