DIN17175 standard applies to seamless tubes including tubes for headers of heat-resistant steels according to Table 1 which are used in the construction of boilers, pipe-lines, pressure vessels and equipment for service up to 600℃ and at simultaneous high pressures, where the tototal stress and the relevant scaling conditions can raise or lower the temperature limit.DIN17175 standard main steel grade:14MoV63,10CrMo910,13CrMo44,15Mo3,ST45-8,ST35-8 and so on.