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Your Position: Home - Hardware - WHY HOT ROLLED FULLY THREAD REBARS ARE NOT CONTINUOUSLY THREADED?

WHY HOT ROLLED FULLY THREAD REBARS ARE NOT CONTINUOUSLY THREADED?

Author: Marie

Sep. 07, 2022

Hardware

Fully thread rebars are widely used for pre-stressing and post-tesnioning purposes.  

The reason why it’s chosen is, despite its high mechanical properties, but also because it can fit a nut directly without screw a new thread. 

 

WHY HOT ROLLED FULLY THREAD REBARS ARE NOT CONTINUOUSLY THREADED?

 

But Why these threads are not continuous?

As we all know, threads can be cut, cold-rolled, and cast. These hot-rolled pre-stressing rebars are cast by modules. During production, there are two modules cover the rod body, then the thread shape. So there are always a gap that haven’t been covered. So this is why the thread is not continuous on hot-rolled fully thread rebars. But don’t worry, the nuts can still fastened well enough.

 

Rolling Method: Hot rolled, Heat-treated

Grade: PSB500, PSB780, PSB830, PSB930, PSB1080

Standard: KSD3504, JIS3112,CAN/CSAG30.18-M92,BS4449-1998,ASTM615/706, DIN488-1

Diameter: regular 15, 20, 25, 28, 32, 36, 40, 50 mm or as customer’s demands

Length: As customer’s demands

Yield strength: 500/780/830/930/1080 MPa

Tensile strength: 630/980/1030/1080/1230 Mpa

Accessories: Full force hex nut, dome washer, bearing plate, coupler, nylon nut

Place of origin: China

Application: Mining, tunneling, construction,slope stabilization

Supply ability: 500 Tons per month

 

Steel GradeYield Strength
MPa
Tensile Strength
MPa
Elongation after Fragure
A%
uniform Elongation
Agt%
Stress Relaxation
Original StressRelaxation rate after 1000h r/%
PSB500≥500≥630≥10≥2.5≤3
PSB830≥830≥1030≥6≥3.50.8R≤3
PSB930≥930≥1080≥6≥3.50.8R≤3
PSB1080≥1080≥1230≥60.8R≤3

 

Nominal Diameter, mmNominal Cross Section Area, mm²Theoretical Weight. kg/m
6(6.5)28.27(33.18)0.222(0.260)
18254.52
20314.22.47
22380.12.98
25490.93.85
28615.84.83
32804.26.31
3610187.99
4012579.87
50196415.42
Theoretical weight in this table is according to steel density 7.85g/cmm³.

 

Contact us for more information about Thread Bar Accessory.


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