Construction Points cold-rolled ribbed steel bars: cold-rolled ribbed steel processing. Cold-rolled ribbed steel bars do not make a board at the end hook; as a negative moment reinforcement plate 90 to be produced. Bending; as there are requirements for seismic beams stirrups should make 135. Bending, construction rebar specifications, straight after bending length is not less than 10d, construction steel, the inner diameter of not less than 5d arc bending and longitudinal reinforcement diameter. Cold-rolled ribbed steel machining tolerances. 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.