Why hot rolled fully thread r±♥∞ebars are not continuoα ₹₩usly threaded?
[ Time：2019-04-10 Click：₽∞&975 ]
Fully thread rebar and rock bolt are Anyang Longtengδ☆'s star products, which are widel↓≠•y used for pre-stressi ←ng and post-tesnioning >α★purposes.
The reason why it's chosen is, d¥¥espite its high mechanical properti÷¶es, but also because it can fit ✘γa nut directly witho ut screw a new thread.
But Why these threads are not"δ® continuous?
As we all know, threads can be cut, colπ₹d-rolled, and cast. These hot-ro$ lled pre-stressing rebarσΩ≠∏s are cast by modules. During product•$↔§ion, there are two modul ×☆es cover the rod body, ♥∞then the thread shape. So there are a™©lways a gap that haven't b©≤een covered. So this is why↕≈¶€ the thread is not continuo>∞ ✔us on hot-rolled fully threa©♠≠d rebars. But don't wo×÷φrry, the nuts can sti↕♥ll fastened well enough.
Rolling Method: Hot rolled, Heat-treated
Grade: PSB500, PSB780, PSB830, PS©λB930, PSB1080
Standard: KSD3504, JIS3112,C™∞AN/CSAG30.18-M92,BS4449-1998↕δ↔,ASTM615/706, DIN488-1
Diameter: regular 15, 20, 25Ω¥, 28, 32, 36, 40, 50 mm or as customer"≤↓'s demands
Length: As customer's demands↑¥π§
Yield strength: 500/780/830/930/1080 MPa
Tensile strength: 630/980/1030/1080/1230 Mpa
Accessories: Full force hex nut, dome wa ★sher, bearing plate,£≠& coupler, nylon nut
Place of origin: China
Brand Name: LT
Application: Mining, tunneling, constructγεδion,slope stabilizatiφon
Supply ability: 500 Tons per month
| Steel Grade | Yield Strength MPa |
Tensile Strength MPa |
Elongation after Fragure A% |
uniform Elongation Agt% |
Stress Relaxation | |
| Original Stress | Relaxation rate afte♥r 1000h r/% | |||||
| PSB500 | ≥500 | ≥630 | ≥10 | ≥2.5 | -- | ≤3 |
| PSB780 | ≥780 | ≥980 | ≥7 | ≥3.5 | 0.8R | ≤3 |
| PSB830 | ≥830 | ≥1030 | ≥6 | ≥3.5 | 0.8R | ≤3 |
| PSB930 | ≥930 | ≥1080 | ≥6 | ≥3.5 | 0.8R | ≤3 |
| PSB1080 | ≥1080 | ≥1230 | ≥6 | -- | 0.8R | ≤3 |
| Nominal Diameter, mm™≈ε∑ | Nominal Cross Section Area, mm² | Theoretical Weight. kg/m |
| 6(6.5) | 28.27(33.18) | 0.222(0.260) |
| 18 | 254.5 | 2 |
| 20 | 314.2 | 2.47 |
| 22 | 380.1 | 2.98 |
| 25 | 490.9 | 3.85 |
| 28 | 615.8 | 4.83 |
| 32 | 804.2 | 6.31 |
| 36 | 1018 | 7.99 |
| 40 | 1257 | 9.87 |
| 50 | 1964 | 15.42 |
| Theoretical weight in this table iφ≈✘s according to steel✔"♣→ density 7.85g/cmm³. | ||
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