October 11, 2022
The surface of the steel bar shall not be cracked, scarred or folded. The surface of the steel bar shall have bumps, but not exceeding the height of the transverse ribs, and the depth and height of other defects on the surface of the steel bar shall not be greater than the allowable deviation of the size of the part.
Size, shape, weight and allowable deviation:
1) Nominal diameter range and recommended diameter
The nominal diameter of rebar ranges from 6 mm to 25mm. The recommended nominal diameter of rebar is 6, 8, 10, 12, 16, 20, 25, 32, 40, 50mm.
2) The surface shape and size of the ribbed steel plate are allowed to deviate
The ribbed steel bar transverse ribs shall meet the following basic requirements:
The Angle β between the rib and the axis of the steel plate should not be less than 45 degrees. When the Angle is not more than 70 degrees, the direction of the rib on both sides of the steel bar should be opposite.
The transverse ribs and spacing l shall not be greater than 0.7 times of the nominal diameter of the reinforcement;
The Angle α between the lateral side of the transverse rib and the steel bar surface shall not be less than 45 degrees;
The total clearance (including the longitudinal rib width) between the ends of the transverse ribs on the opposite sides of the steel bar should not be greater than 20% of the nominal perimeter of the steel bar;
When the nominal diameter of reinforcement is not more than 12mm, the relative rib area should not be less than 0.055; The nominal diameter is 14mm and 16mm, the relative rib area should not be less than 0.060; When the nominal diameter is greater than 16mm, the relative rib area should not be less than 0.065.
3) Length and allowable deviation
A. Length: reinforcement is usually delivered according to the fixed length, the specific length of delivery should be indicated in the contract; When REBAR IS DELIVERED IN REELS, EACH REBAR SHALL BE ONE REBAR, ALLOWING 5% OF THE REBAR NUMBER PER BATCH (OR TWO IF LESS THAN TWO) TO BE COMPOSED OF TWO REBARS. The disc weight and diameter shall be stipulated by the supply and demand parties through negotiation.
b. Allowable deviation of length: The allowable deviation of length of reinforcement shall not be more than +50mm when delivered at a fixed size.
c, bending degree and end: the bending of straight bar should not affect the normal use, the total bending degree is not more than 0.4% of the total length of steel bar; The end of the steel bar should be cut straight, and the local deformation should not affect the use.
