astm a312 بادوام با قیمت کمتر
ASTM A312 A312M-21 、 Published May 2021. Originally approved in 1948. Last previous edition approved in 2019 as A312/A312M- 19. DOI: 10.1520/A0312 A0312M 21. 2 For ASME Boiler and Pressure Vessel Code applications see related Specifi cation SA 312 in Section II of that Code. and furnished provided such pipe complies with all other …