Full Threaded Rock Bolt, Mining Tunnel Application, anchor bolt, FULLY RIBBED BAR

Rock bolts are widely used for rock reinforcement in mining and tunneling. Our heat-treated rebars have big advantage on yield strength, tensile strength and pre-stress, which could help to support underground tunnels, roof support.

Steel grade:  20MnSi

Dia Yield strength
MPa
Tensile strength
MPa
Elongation Rate
%
Yielding Load
KN
Tensile Load
KN
Weight
Kg/m
φ16  ≧345  ≧510  ≧25  ≧69  ≧100 1.6
φ18  ≧345  ≧510  ≧25  ≧87  ≧126 2
φ20  ≧345  ≧510  ≧25  ≧108  ≧156 2.5

SCREW-THREAD STEEL BARS FOR PRE-STRESSING OF CONCRETE

The bar portion of rock bolt, is called as screw-thread steel bars, mostly applying for pre-stressing of concrete, which has dis-continuous threads with high strength, high precise, and can be anchored directly by nuts or internal threaded connectors/coupler.

20170913083754525

 

We divide the fully thread bars by the yield strength – Code PSB + minimum yield strength(eg: PSB830). P, S, B represent Prestressing, Screw-thread, bars, and 830 means this rebars’ standard yield strength is 830 MPa. 

 

Strength Class Yield Strength, Rel/Mpa Tensile Strength,(Rm/Mpa) Elongation after fracture, A/%
PSB830 830 1030 7
PSB930 930 1080 6
PSB1080 1080 1230 6

 

TOLERANCES

Nominal diameter range : 18 ~50 mm

25mm, 32mm is the mostly common diameters. 

Rebar lengths are often fixed according to orders. Length tolerance is 0~+50mm; Cutting length tolerance is 0~+20mm;

Curving degree shall be less than 0.4% rebar’s total length, and less than 4mm per meter.

top ends must be flat and smooth, to ensure nuts or connectors/coupers passing through.

Nominal Diameter, mm 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 is according to steel density 7.85g/cmm³.

APPEARANCE

Fully ribbed bar with no longitudinal ribs
2018111393938838061

 

 

 

PERMISSIBLE TOLERANCES FOR CHEMICAL COMPOSITION OF STEEL PRODUCTS 

GB/T 222-2006

 

 

Anyang Longteng Heat Treatment Material Co.,Ltd is a professional heat-treating manufacturer. Our high strength rebars and fasteners have super high performance and properties, much higher than standard requriements. More technical information and discussion, please contact us. We will give you reply within 2 working days, with professionals!

[email protected]

Whats’ app / We chat: +86-18317351307


Post time: Jan-02-2019