Cov yeeb nkab square yog lub npe rau cov yeeb nkab square, uas yog, cov yeeb nkab steel uas muaj qhov sib npaug ntawm sab ntev. Nws yog ua los ntawm sawb hlau uas tau ua tiav thiab dov. Feem ntau, lub sawb yog unpacked, flattened, coiled, welded los ua ib lub raj puag ncig, thiab ces dov mus rau hauv ib lub raj square los ntawm lub round raj thiab txiav mus rau qhov ntev yuav tsum tau. Feem ntau 50 daim ib pob.
Lub raj square yog muab faib ua seamless thiab welded, thiab seamless square raj yog tsim los ntawm extruding ib seamless round raj.
