Construction Points cold-rolled ribbed steel bars: cold-rolled ribbed steel bars typically bundles supply cold-rolled ribbed steel bars according to project needs length straight, their mechanical properties and process performance should be approved sampling. Each batch should be the same manufacturer, same size, same sources of raw materials, the same steel manufacturing process consisting CRB600H cold-rolled ribbed steel company, and not more than 10t. Each batch of steel should be manufactured quality certificate of CRB600H sales of cold-rolled ribbed steel bars, each bundle should sign. Sampling cold-rolled ribbed steel bars and environmental requirements: ribbed steel cold rolling: batch should be of the same grade, the same shape, the same production process and same delivery status of steel composition, each batch of not more than 60t. Tensile test batch-by-plate test, each disc random interception of a specimen; bending and repeated bending test each batch of randomly selected two random intercept prepare a specimen.