Cast iron covers are more applications in our lives because this is also the result of its outstanding performance, mainly reflected in:

1, with good wayward, is more than 10 times the gray steel material.

2, with outstanding corrosion resistance, the service life is 2 times the gray steel pipe, ordinary steel pipe 5 times.

3, cast iron covers have good plasticity, and high carbon steel similar to the gray iron material elongation is zero.

4, higher strength, gray iron material is 3 times.