The following is the standard information about threaded steel in China (taking common hot-rolled ribbed steel bars as an example. The following is not presented in a strict table form but covers the key points. You can organize it into a table based on the following):
I. Dimensions and Specifications (such as GB1499.2 – 2018, etc.)
- The nominal diameter range: 6 – 50mm is common, and the recommended nominal diameters of the steel bars are 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 32mm, 40mm, 50mm, etc.
- Shape: With longitudinal ribs and evenly distributed transverse ribs along the length. The longitudinal section of the transverse ribs is crescent-shaped (crescent ribbed steel bars), etc.
II. Technical Requirements such as Mechanical Properties (such as GB1499.2 – 2018, etc.)
- Grades include HRB400, HRB500, HRB600, etc.
- Yield strength (MPa): HRB400 ≥ 400; HRB500 ≥ 500, etc.
- Tensile strength (MPa): HRB400 ≥ 540; HRB500 ≥ 630, etc.
- Elongation after fracture:
- The total elongation at maximum force Agt (%) is not less than the corresponding regulations, etc.
- For HRB400, Agt ≥ 7.5, etc.
III. Weight (Theoretical Weight)
| Nominal Diameter (mm) | Theoretical Weight (kg/m) | |
|---|---|---|
| 6 | 0.222 | |
| 6.5 | 0.260 | |
| 8 | 0.395 | |
| 10 | 0.617 | |
| 12 | 0.888 | |
| 14 | 1.21 | |
| 16 | 1.58 | |
| 18 | 2.00 | |
| 20 | 2.47 | |
| 22 | 2.98 | |
| 25 | 3.85 | |
| 28 | 4.83 | |
| 32 | 6.31 | |
| 36 | 7.99 | |
| 40 | 9.87 | (Generally, for steel bars with diameters of φ12 (including 12) and below and φ28 (including 28), three decimal places are usually taken after the decimal point. For steel bars with diameters of φ14 to φ25, two decimal places are usually taken after the decimal point.) |
IV. Packaging, Marking and Quality Certificates (Relevant regulations such as GB/T 2101, etc.)
- Each bundle (coil) of steel bars should be uniformly bundled and packaged, etc.
- The surface of the steel bars should have brand marks, etc.
- The quality certificate should include detailed information such as the implemented standard, product name, specification, quantity, production date, etc.
If it involves other types of threaded steel bars such as threaded steel bars for prestressed concrete, there are also specialized standards (such as “Threaded Steel Bars for Prestressed Concrete” GB/T 20065 – 2016, etc.). There are corresponding different regulations and standard requirements in terms of dimensions, mechanical properties, chemical composition, etc.
