Shagang steel plate, screw steel Yong Xin new Shanghai factory direct sales agents of special transit West can unpacking manufacturers, reasonable prices! Integrity management, quality assurance. Inquire 0512-65086995 13382509806 15950991968 Xinlong steel quality assurance, complete specifications: Φ6, Φ8, Φ10, Φ12, Φ14, Φ15, Φ16, Φ18, Φ20, Φ22, Φ25, Φ28 and other reinforced concrete rolled ribbed bar with quality testing Standard name: reinforced concrete rolled ribbed steel II Standard: GB1499-1998 Third, the chemical composition: Chemical composition% C Si Mn PS Ceq HRB335 0.25 0.80 1.60 0.045 0.045 0.52 HRB400 0.25 0.80 1.60 0.045 0.045 0.54 HRB500 0.25 0.80 1.60 0.045 0.045 0.55 Fourth, the mechanical properties of (1) the mechanical properties of steel should meet the following regulations: Grades nominal diameter mm σs (or σp0.2) Mpa σb MPa δ5% no less than HRB335 6-25 28-25 335 490 16 HRB400 6-25 28-50 400 470 14 HRB500 6-25 28-50 500 630 12 (2) bars in maximum force, total elongation δgt not less than 2.5%. Suppliers such as to ensure that, from time to test. (3) According to the requirements, we can supply steel to meet the following conditions: (a) the tensile strength of steel with the measured actual yield point of not less than 1.25; (b) actual yield point steel minimum yield point of the table with the provisions of is not more than 1.30. Fifth, the process performance (1) bending performance table below provides the core diameter bend bent 180 degrees, reinforced by the curved parts of the surface can not crack. Grade nominal diameter a mm diameter bend test bend HRB335 6-25 28-50 3a 4a HRB400 6-25 28-50 4a 5a HRB500 6-25 28-50 6a 7a (2) reverse bending performance According to the requirements, steel can reverse bending performance test. Reverse bending test bending test than the diameter of the apex corresponding increase in a bar diameter. The first positive bent 45 degrees, after the reverse bending 23 degrees, 23 degrees after the reverse bending. After the reverse bend test, reinforced by the curved parts of the surface can not crack. Sixth, the surface quality steel surface allowed to have cracks, scars and folds. Steel surface bumps are allowed, but must not exceed the height of the transverse ribs, other defects on the steel surface depth and height must not be greater than the site where the size tolerances. Seven, size, shape, weight and allow deviation (1) Nominal diameter Recommended diameter steel range and nominal diameter in the range of 6 ~ 25mm, the standard recommended nominal diameter steel 6,8,10,12,16,20,25, 32,40,50mm. Surface shape and size (2) ribbed steel plate tolerance ribbed steel cross ribs should meet the following basic requirements: the angle β axis transverse ribs and the steel plate should not be less than 45 degrees, when the angle is not more than 70 degrees reinforced transverse ribs on opposite sides of the opposite direction should; l transverse ribs and spacing not greater than 0.7 times the nominal diameter of the rebar; the angle α transverse ribs and reinforced side surface of not less than 45 degrees; reinforced on opposite sides of the cross rib between the ends The gap (including the longitudinal ribs width) shall not exceed the sum of 20% of the nominal rebar perimeter; When the bar is not more than 12mm nominal diameter, the relative rib area of ??not less than 0.055; nominal diameter of 14mm and 16mm, the relative rib area of ??not less than 0.060; nominal diameter greater than 16mm, the relative rib area of ??not less than 0.065. (3) Length and tolerance a, length: steel is usually delivered by length, specific length of delivery should be specified in the contract; Reinforced with coil delivered to each plate shall be a bar, allowing each batch 5% of the plate number (which may have two sets when less than two disks) from the two steel components. The plate weight and diameters of the provisions negotiated by both parties. b, Length tolerance: Length reinforced by the length of time of delivery shall not be greater than the allowable deviation of + 50mm. c, bending and end: straight bars bending change should not affect normal use, the total curvature is not greater than 40% of the total length of steel; steel cut ends should be honest, should not affect the use of local deformation.