introduction of nominal size and sctual size of seamless pipe:a. nominal size: it is the nominal size specified in the standard, the ideal size expected by users and manufacturers, and the order size indicated in the contract.b. actual size: it is the actual size obtained in the production process,

low temperature carbon steel seamless pipe is a medium carbon structural steel, cold steel has good low energy, good mechanical properties, low price, and a wide range of sources, so it is widely used. its biggest weakness is low hardenability, and the cross-sectional size of japanese workpieces is

compared with ordinary steel pipes, seamless pipes (smls) can withstand higher pressures. therefore, in industrial production, seamless steel pipes are used when pipes that need to withstand greater pressure. some people call it "the tiny blood vessels in the industry", whether it is the manufacture

the seamless pipe marking shall include the following: manufacturer's name or trademark, product standard number, steel grade, seamless steel pipe specification and traceability identification number. marking can be done by jet printing, stamping, rolling, printing, pasting or sticking labels. the m

standard of carbon seamless steel pipe astm a53 gr.bblack and hot-dipped zinc-coated steel pipes welded and seamlessastm a106 gr.bseamless carbon steel for high temperature serviceastm sa179 seamless cold-drawn low-carbon stee