hot-rolled seamless steel pipe is a large category of seamless steel pipe, which is divided according to the production method. hot rolling is relative to cold rolling, cold rolling is rolling at room temperature, and hot rolling is rolling above the recrystallization temperature. seamless steel pip

carbon steel is susceptible to corrosion. blackening is a process to create a tenacious oxide coating that provides some corrosion resistance. black steel is made of steel that has not been galvanized. its name comes from the scaly, dark-colored iron oxide coating on its surface. it's used in a

about hs codethe customs code is the hs code, which is the abbreviation of the harmonized coding system. its full name is "international convention for harmonized commodity description and coding system" (international convention for harmonized commodity description and coding system), abbreviated a

seamless steel pipe weight calculation formula:the weight of seamless pipe per meter w=0.02466*s(d-s). symbol meaning: d=outer diameter, s=wall thickness.for example: a seamless pipe with an outer diameter of 60mm and a wall thickness of 4mm, find the weight per meter.solution: weight per meter

the seamless steel pipe is formed in one piece and is directly perforated with round steel. there is no weld on the surface, and the use range is wide. what are the uses of the seamless steel pipe?1) what are the uses of seamless steel pipesseamless steel pipes are used in a wide variety of applicat