Member's display HELENBELY JiyuanSanheZhengyuan Petroleum Machinery Ltd.

Saturday, December 13, 2008

This is also a kind of our company's product ,we also use AISI 4145H steel as the raw material of this product,when making we strictly according to standards such as SY/t5144-1997,SY/T5146-1997 and so on to make sure that the products can reach the requirement of API. As we are the...