October 11, 2022
Inspection of rebar and process inspection of rebar joint:
The inspection of steel bar first to check the steel plate number and quality certificate; Next want to do appearance inspection, from each batch of rebar extract 5%, check its surface shall not have cracks, wounds and lamination, rebar surface convex block shall not exceed the height of the transverse rib, the depth and height of the defect shall not be greater than the allowable and deviation of the part, rebar every meter bending degree shall not be greater than 4 mm; In the following mechanical property test, if each batch is less than 60 tons, two pieces will be taken from it, and two sections of each piece will be cut for tensile and cold bending tests respectively. When cutting the specimen, 100-500mm of both ends of the steel bar should be removed. When the specimen is larger than 60 tons, the corresponding steel bar should be taken. If the result of one test does not meet the requirements, a double quantity of samples from the same batch is used for each test. If there is still one unqualified sample, the batch of rebar is unqualified. If brittle fracture, poor welding performance or abnormal mechanical properties occur in the process of hot rolled rebar, chemical composition analysis and other special inspection should be carried out.
The finished product
Rebar with waste heat treatment of reinforced concrete: immediately after hot rolling through water, surface control cooling, and then use the core waste heat to complete the tempered treatment of the finished steel bar.
Ribbed bar: A bar with a surface usually consisting of two longitudinal ribs and transverse ribs evenly distributed along the length.
Crescent rib bar: A bar whose longitudinal section of the rib is crescent shaped and does not intersect with the longitudinal rib.
Longitudinal ribs: uniform continuous ribs parallel to the axis of the steel bar.
Transverse rib: other ribs that are not parallel to the longitudinal rib.
The diameter of a circle equal to the nominal cross-sectional area of a ribbed bar.
The relative rib area of a ribbed bar: the ratio of the projected area of a rib on the vertical plane of the bar axis to the product of the nominal perimeter of the bar and the distance between the ribs.
