The ST44.4 steel tubes of DIN1630 are designed to meet high performance requirements. Normally , there are no limiting values for the maximum permission working pressure of DIN 1630 ST44.4 seamless steel tubes. DIN 1630 ST44.4 steel tubes/pipes are predominantly used in the construction of chemical plants, vessels, pipework and for general mechanical engineering purpose. The permissible working pressure shall not exceed 300°C.(The upper yield stress values for tubes at temperature up to 300°C are specified in below sheet.

DIN1360 St 44.4 seamless steel pipe upper yield stress for a design temperature