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
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
GOST 8478-81GOST 23279-2012GOST 6727-80GB/T 1499.3GB/T 13788ASTM A1064/A1064MEN 10080VR-1B500CCRB550Q195Q235
Parameters
| Parameters | |
|---|---|
| Wire diameter | 3, 4, 5, 6 mm |
| Opening | 50×50, 100×100, 150×150, 200×200 mm |
| Sheet | 0.5–2.0 × 2–6 m, to specification |
| Roll | width up to 2 m, for Ø3–4 mm |
| Wire | VR-1 Ø3–5 per GOST 6727, CRB550, plain per GOST 3282 |
| Surface | black, galvanized to order |
Sizes and weight
| Opening, mm | Ø, mm | Weight, kg/m² |
|---|---|---|
| 50×50 | 3 | 2.22 |
| 50×50 | 4 | 3.95 |
| 50×50 | 5 | 6.17 |
| 100×100 | 3 | 1.11 |
| 100×100 | 4 | 1.97 |
| 100×100 | 5 | 3.08 |
| 100×100 | 6 | 4.44 |
| 150×150 | 4 | 1.32 |
| 150×150 | 5 | 2.06 |
| 150×150 | 6 | 2.96 |
| 200×200 | 4 | 0.99 |
| 200×200 | 5 | 1.54 |
| 200×200 | 6 | 2.22 |
Description
Welded mesh is made from VR-1 cold-drawn indented wire to GOST 6727-80 or from plain wire to GOST 3282, joined by resistance spot welding at every intersection on multi-electrode machines. Welded mesh for reinforcing concrete structures is governed by GOST 8478-81 and GOST 23279-2012; Chinese mills weld it to GB/T 1499.3 from Q195–Q235 wire or CRB550 to GB/T 13788. Masonry mesh with 50×50 and 100×100 openings comes in rolls and sheets of masonry width; road mesh with 100–200 mm openings comes in sheets up to 2×6 m.
The difference between the wires lies in profile and strength: VR-1 and CRB550 have indentations or ribs for bond with concrete and strength class B500, while plain St2kp–St3 wire is used for masonry and render, where bond is not specified. GOST 23279 sets tolerances on mesh opening, wire diameter, sheet dimensions and weld joint strength; the number of unwelded joints is limited by the standard.
During inspection at the mill the bureau measures the wire diameter with a micrometer on longitudinal and transverse wires, the mesh opening and sheet dimensions with callipers and a tape, checks the shear strength of weld joints and counts unwelded intersections on sheets from different bundles. The mill test certificate (MTC) is checked against the wire heat, strength class and test results; the bundle marking, tag and strapping preventing sheet deformation during handling are checked.
Applications
- reinforcing brick and block masonry between courses
- floor screeds, underfloor heating, aprons around buildings
- bases for roads, yards and paving
- render over insulation and reinforcement of facade layers
- cages, enclosures and fencing from galvanized mesh
- precast concrete plants: lightweight slabs, partitions, ventilation blocks
Packing and shipment
Sheets in bundles strapped with wire or steel band in four places, rolls tied in three places; bundle weight is agreed in the specification. A mill tag on the bundle with opening, diameter, sheet size and wire 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
Mesh 20–60 · Ø1.4–3.0 · black · galvanized · GOST 5336
Chain-link mesh
Single-woven mesh with 20–60 mm openings from black and galvanized wire in rolls
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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