VR-1 · Ø3–6 · 50×50–200×200 · GOST 8478 · GOST 23279
Welded masonry and road mesh
Mesh of 3–6 mm cold-drawn wire with 50–200 mm openings in sheets and rolls
A500C · Ø6–12 · 100×100–200×200 · sheets 2×6 m · GOST 23279
Welded reinforcing mesh
Mesh of A500C rebar 6–12 mm in 2×6 m sheets for slabs, floors and foundations
GOST 23279-2012GOST 34028-2016GB/T 1499.3GB/T 1499.2-2018ASTM A1064/A1064MEN 10080A500CB500CHRB400EHRB500ECRB550
Parameters
| Parameters | |
|---|---|
| Bar diameter | 6, 8, 10, 12 mm |
| Opening | 100×100, 150×150, 200×200 mm |
| Sheet | 2×6 m; 2×3 m and 1×2 m to specification |
| Rebar class | A500C, B500C / HRB400E, HRB500E |
| Joint | resistance spot welding at every intersection |
| Overhangs | per GOST 23279, length to specification |
Sizes and weight
| Opening, mm | Ø, mm | Weight, kg/m² | 2×6 m sheet, kg |
|---|---|---|---|
| 100×100 | 6 | 4.44 | 53.3 |
| 100×100 | 8 | 7.89 | 94.7 |
| 100×100 | 10 | 12.33 | 148.0 |
| 100×100 | 12 | 17.76 | 213.1 |
| 150×150 | 6 | 2.96 | 35.5 |
| 150×150 | 8 | 5.26 | 63.1 |
| 150×150 | 10 | 8.22 | 98.6 |
| 150×150 | 12 | 11.84 | 142.0 |
| 200×200 | 6 | 2.22 | 26.6 |
| 200×200 | 8 | 3.95 | 47.4 |
| 200×200 | 10 | 6.17 | 74.0 |
| 200×200 | 12 | 8.88 | 106.5 |
Description
Reinforcing mesh is welded from A500C ribbed bars to GOST 34028-2016 or B500C by resistance spot welding at every intersection to GOST 23279-2012. Chinese mills assemble it on automatic lines to GB/T 1499.3 from HRB400E or HRB500E rebar to GB/T 1499.2-2018 or from cold-rolled CRB550. The standard 2×6 m sheet with 100, 150 or 200 mm openings replaces manual tying and removes the laying-out and tying of bars from the site.
The rebar class determines the design strength: A500C and B500C give a yield strength of 500 N/mm², HRB400E gives 400 N/mm², so for projects to GOST the specification fixes the class to GOST 34028 and the mill confirms it with a certificate for the source bar. GOST 23279 specifies weld joint strength, tolerances on opening, diameter and sheet dimensions, and the length of bar overhangs at the edges.
During inspection at the mill the bureau measures the bar diameter with callipers over the ribs and over the core, the opening, sheet dimensions and overhangs, checks the shear strength of weld joints on samples cut from sheets of different bundles and counts unwelded joints. The mill test certificate (MTC) is checked against the rebar heat and chemical composition, strength class and test reports; the marking and tag of each bundle and the strapping preventing sheets from shifting during transhipment are checked.
Applications
- cast-in-place floor and roof slabs
- ground-bearing floors of industrial shops and warehouses
- raft and strip foundations
- road slabs, yards and car park pavements
- precast concrete plants: slabs, wall panels, channels
- retaining walls and tanks
Packing and shipment
Sheets in bundles strapped with steel band in four places, with spacers for slings; bundle weight is agreed in the specification. A mill tag on the bundle with rebar class, diameter, opening, sheet size and heat.
Grade equivalents
| GOST | GB (China) | ASTM | EN | Note |
|---|---|---|---|---|
| St1kp (GOST 380) | Q195 | AISI 1006 | C4D (EN 10016-2) | Nearest equivalent by carbon content; wire rod steel for soft tying wire |
| St2kp, St3kp (GOST 380) | Q215, Q235 | AISI 1008 | C7D (EN 10016-2) | Nearest equivalent; for galvanized wire and chain-link mesh. Q235 is stiffer than St2kp; the grade is fixed in the specification |
| O wire (annealed, GOST 3282) | 退火钢丝 (GB/T 343) | ASTM A853 annealed | EN 10218-2 | Equivalence by delivery condition, not by steel grade: EN 10218-2 sets only diameter tolerances |
| 1Ts, 2Ts (GOST 3282) | 热镀锌 / 电镀锌 (GB/T 343) | ASTM A641 Class 1, Class 3 | EN 10244-2 class A–D | Classes are defined by zinc weight per m² and do not match directly; the specification states the coating weight in g/m² |
| VR-1 (GOST 6727) | CRB550 (GB/T 13788) | ASTM A1064 D-wire | B500A (EN 10080) | Nearest equivalent: VR-1 is cold-drawn with indentations, CRB550 is cold-rolled ribbed; strength is close, the profile differs |
| A500C (GOST 34028) | HRB400E, HRB500E | Grade 60 (ASTM A615) | B500B (EN 10080) | Nearest equivalent by yield strength is HRB500E (500 N/mm²); HRB400E is lower (400 N/mm²); for reinforcing mesh the specification states the class to GOST 34028 and the grade to GB/T 1499.2 |
Equivalents are the closest match, not identical: chemistry and tolerances differ between standards. The exact grade and standard are written into the contract.
Related items
O · Ø0.8–4.0 · St1kp–St3 · GOST 3282
Annealed tying wire
Soft heat-treated wire 0.8–4 mm for tying reinforcement cages and mesh
Buyer questions
How to read a mill test certificate for wire and mesh
The mill test certificate (MTC) states the standard, steel grade, wire rod heat number, chemical composition, diameter, tensile strength, elongation and number of reverse bends; for galvanized wire, the zinc weight per m². The bureau checks the heat number against the tag on the coil or mesh bundle and against the marking on the packaging: a certificate without a matching heat is not accepted.
How tying wire differs from galvanized wire and which to choose
Tying wire is annealed (O), soft, bends by hand and does not spring back; it is used for tying reinforcement cages and stays inside the concrete, where corrosion is not critical. Galvanized wire is usually unannealed, stiffer, with a zinc coating of class 1Ts or 2Ts; it works outdoors: fencing, guy wires, fixing mesh. Galvanized wire is not needed for tying cages, and black wire is not suitable for outdoor use.
How the tonnage of wire and mesh is calculated
Wire is calculated by weight: the weight per linear metre equals 0.006165·d², where d is the diameter in millimetres; the length per coil and per tonne follows from this. Welded mesh is calculated by weight per square metre: twice the number of wires per metre multiplied by the weight per metre of wire, plus the overhangs at the sheet edges. Chain-link mesh is counted in rolls of a given width and length; the roll weight is stated in the mill certificate.
What is checked during inspection at the mill
Wire diameter with a micrometer in two perpendicular directions on several coils of the batch, ovality, absence of scale and cracks; for galvanized wire, zinc weight by the gravimetric method and coating adhesion by wrapping around a mandrel. For welded mesh: wire diameter, mesh opening, sheet dimensions, shear strength of weld joints, number of unwelded joints. The certificate is checked against the heat, along with marking, tag and packaging; an inspection report with photographs is drawn up.
How a batch is formed and whether there is a minimum quantity
The batch is sized to your quantity; send a specification with diameters, mesh openings, sheet or roll dimensions and coating requirements. Wire and mesh of different sizes are combined in one container so that the load is complete; the weight of coil, roll and bundle is agreed with the mill when the order is placed.
Price request
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Steel pricing depends on grade, size, tonnage and delivery terms on the day of contract. A number on the page would be wrong by the time you read it.
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