The Differences Between B500A, B500B, and B500C
The differences between the A, B and C designations are complex and relate to structural tolerances. For reinforcement mesh products, grade B500A steel is typically used, and for rebar, B500B is used. B500C steel is seldom requested and it would always be worth checking with a structural engineer whether grade B500B could be used instead of B500C, since B500C typically has a significant cost overhead.
| Welded steel type | B500A | B500B | B500C |
| Area | smooth, dented, ribbed | dented, ribbed | ribbed |
| Delivery form | coils, bars, spot-welded reinforcement mesh, lattice girders | coils, bars, spot-welded reinforcement mesh |
| Nominal centerline [mm] | 4 – 16 | 6 – 50 | 6 – 50 |
| Min. flow / yield limit Re [Mpa] | 500 | 500 | 500 |
| Re, act / Re, nom <1.25 |
| Min. Rm / Re ratio | 1.05a | 1.05 | 1.15c; <1.35 |
| Min. elongation at max load Agt [%] | 3.0a, b | 5.0b | 7.5b, c |
| Min. fatigue strength 2σad [MPa] | 100 | d ≤ 28 mm: 175 | d ≤ 28 mm: 175 |
| d> 28 mm: 145 | d> 28 mm: 145 |
| Min. shear force |
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| 0.25 x An x Renvt |
| 0.25 x An x Re 0.25 x A 0 / b x Re 10 / b | 0.25 x An x Re 0.25 x A 0 / b x Re 10 / b |
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| or 0.6 x Ad x Re, d | or 0.6 x Ad x Re, d |
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| Tolerance nominal centerline [%] | +/- 4.5 | +/- 4.5 | +/- 4.5 |
| Chem. composition [mass%] | C <0.22, etc | C <0.22, etc | C <0.22, etc |
| Ceq <0.50 | Ceq <0.50 | Ceq <0.50 |
| Min. relative opp. cross rib (dent), fr / pf | d = 4.0 – 6.0: 0.039 d = 9.0 – 10.5: 0.052 |
| d = 6.5 – 8.5: 0.045 d = 11.0 – 50: 0.056 |
| Product name | Deformed Steel Rebars,Rebar |
| Material | Q195, Q235, Q345; ASTM A53 GrA,GrB; STKM11,ST37,ST52, 16Mn,etc. |
| Size | 6mm,8mm,10mm, 12mm, 14mm, 16mm, 20mm, 22mm, 25mm, 30mm, 32mm, 40mm,50mm |
| Length | 5m-14m,5.8m,6m,10m-12m,12m or as customer's actual reques |
| Standard | BS4449-2005,GB1449.2-2007,JIS G3112-2004, ASTM A615-A615M-04a |
| Grade | Grade A, Grade B, Grade C |
| Section Shape | Spiral Shap,Herringbone Shap,Crescent Shap |
| Technique | Steel Rebar Iron Rod |
| Packing | Bundle, or with all kinds of colors PVC or as your requirements |
| Ends | Plain end/Beveled,protected by plastic caps on both ends, cut quare,grooved,threaded and coupling,etc. |
| Surface Treatment | 1. Galvanized 2. PVC,Black and color painting 3. Transparent oil,anti-rust oil 4. According to clients requirement |
| Delivery time | Usually within 15 days after receipt of advance payment |
| Size(mm) | Base Diameter(mm) | Transverse Rib Height(mm) | Longitudinal Rib Height(mm) | Transverse Rib Spacing(mm) | Unit Weight(kg/m) |
| 6 | 5.8±0.3 | 0.6±0.3 | ≤0.8 | 4±0.5 | 0.222 |
| 8 | 7.7±0.4 | 0.8±0.3 | ≤1.1 | 5.5±0.5 | 0.395 |
| 10 | 9.6±0.4 | 1±0.4 | ≤1.3 | 7±0.5 | 0.617 |
| 12 | 11.5±0.4 | 1.2±0.4 | ≤1.6 | 8±0.5 | 0.888 |
| 14 | 13.4±0.4 | 1.4±0.4 | ≤1.8 | 9±0.5 | 1.21 |
| 16 | 15.4±0.4 | 1.5±0.5 | ≤1.9 | 10±0.5 | 1.58 |
| 18 | 17.3±0.4 | 1.6±0.5 | ≤2 | 10±0.5 | 2.00 |
| 20 | 19.3±0.5 | 1.7±0.5 | ≤2.1 | 10±0.8 | 2.47 |
| 22 | 21.3±0.5 | 1.9±0.6 | ≤2.4 | 10.5±0.8 | 2.98 |
| 25 | 24.2±0.5 | 2.1±0.6 | ≤2.6 | 12.5±0.8 | 3.85 |
| 28 | 27.2±0.6 | 2.2±0.6 | ≤2.7 | 12.5±1.0 | 4.83 |
| 32 | 31±0.6 | 2.4±0.7 | ≤3 | 14±1.0 | 6.31 |
| 36 | 35±0.6 | 2.6±0.8 | ≤3.2 | 15±1.0 | 7.99 |
Rebar is the common name for hot rolled ribbed steel bars. The grade of ordinary hot-rolled steel bar is composed of HRB and the minimum yield point of the grade. H, R, and B are the first letters of the three words Hotrolled, Ribbed, and Bars respectively. Hot-rolled ribbed steel bars are divided into three grades: Grade II HRB335 (the old grade is 20MnSi), Grade III HRB400 (the old grades are 20MnSiV, 20MnSiNb, 20Mnti), and Grade IV HRB500.
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