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PRODUCT DESCRIPTION
Bridges ask for quiet reliability: plates that sit flat, take a weld cleanly, and accept coatings without fuss. This Q235 / astm a36 steel plate family delivers exactly that. Hot-rolled plates arrive with the dark, slightly grippy mill skin that shops expect; cold-rolled sheets feel crisp and uniform when you run a glove over them. Strike an arc and the puddle wets in with a steady note; spatter stays low, and the heat-affected zone is tidy. After blasting, primer bites evenly; galvanized plates show a bright spangle and shrug off splash. For owners this becomes fewer interventions over the life of the asset. For fabricators it means faster fit-up, fewer shims, and schedules that hold.
| Item | Scope / Option |
|---|---|
| Standards / Grades | AISI / ASTM / JIS / DIN / GB; Q235 / ASTM A36 / EN S235J2 |
| Thickness | Hot-rolled 2.75–100 mm；Cold-rolled 0.2–3.0 mm |
| Width | 1000–5000 mm（common stocked cuts 500–2200 mm） |
| Length | 1–3 m（custom CTL up to 12,000 mm） |
| Technique | Hot Rolled / Cold Rolled |
| Surface | Black, Oiled, Shot-blasted, Primed, Painted, Galvanized |
| MOQ | 5 tons |
| Capacity & Stock | Stock available；30,000 t/month throughput |
| Terms | FOB / EXW / CIF |
| Typical Use | Bridges, construction, machinery, containers, shipbuilding |
Design clarity：A36-level yield simplifies member sizing and splice detailing—streamlined calculations and predictable inspector sign-off.
Weldability that protects throughput：Low carbon chemistry supports sound welds, lowers preheat demands, and reduces rework.
Finish tailored to environment：From shot-blast + primer for shop speed to galvanizing for salt/splash zones.
Dimensional discipline：Gauge control and flatness reduce lamination rejects, bolt-up fights, and camber surprises on long splice plates.
Traceable & testable：Heat numbers on bundles, MTC supplied; optional UT and CVN for fatigue-sensitive zones.
A brief orientation, then the specifics you can use in tenders.
Quick Note（1–2 lines）
These commodity structural grades are routinely cross-referenced for global procurement. Always align impact class and project code notes.
Side-by-Side View（Table）
| GB | ASTM | EN Family | Typical Use Notes |
|---|---|---|---|
| Q235 | A36 | S235 (JR/J0/J2) | General bridge members, bracing, connection plates; select EN impact class to match service temperature |
Checklist（When mixing grades）
Confirm impact requirements（e.g., JR vs J0 vs J2）
Align welding procedure（WPS/PQR）
Specify any UT/CVN for fracture-sensitive details
Keep documentation consistent（MTC heat-to-bundle mapping）
A short framing line, then what buyers need at a glance.
Context
Hot-rolled covers primary members at scale; cold-rolled serves liners or architectural steel where surface and gauge are tighter. We match tolerance classes to your spec and optimize cut maps to minimize offcuts.
Typical Size Matrix
| Form | Thickness | Common Widths | Typical Lengths |
|---|---|---|---|
| Hot-rolled plate | 2.75–100 mm | 1000–5000 mm（stocked 500–2200 mm cuts） | 1–3 m（CTL up to 12,000 mm） |
| Cold-rolled sheet | 0.2–3.0 mm | 500–2200 mm | As ordered（CTL） |
Tolerance Option
Thickness：per order class（HR/CR）
Flatness：plate class suitable for bridge fabrication
Edge geometry：camber/sweep controls for long splice plates
Mark-and-match：bundle/plate IDs aligned to shop drawings
Select a finish that fits environment and workflow; each option ships with packaging that protects edges and face.
Black hot-rolled：classic mill scale; ideal for in-shop blasting or painting.
Oiled：transit protection when plates head straight to the burn table.
Shot-blasted + primer（e.g., zinc-rich）：even tooth; ready for immediate fit-up without re-blast.
Galvanized：spangle sheen; proven performance in splash/salt exposure.
Custom coatings：system alignment to owner specs on request.
Why it matters：Balanced strength and ductility support welded assemblies and jobsite tie-ins without brittle behavior.
Mechanical：Yield ≥ 250 MPa（~36 ksi）；Tensile 400–550 MPa；Elongation ≥ 20%。
Chemistry：C ≤ 0.25%；Si 0.15–0.40%；Mn 0.85–1.35%；P ≤ 0.04%；S ≤ 0.005%。
Options：Specify CVN temperature/energy for cold climates；add UT levels at critical joints；hardness spot checks on request.
Documentation：Results reported in the MTC and inspection dossier for traceability.
Single-PO services reduce handoffs and shrink lead time while keeping documents clean.
Value-add processing：CTL、shearing、plasma/oxy-fuel cutting、bevel prep、drilling/countersinking、slotting、stamping、shot-blast + primer。
Inspection：Dimensional checks、surface review、hardness sampling、UT/MT/PT per spec。
Documentation：MTC 3.1 standard；3.2 with third-party witness available；bundle-level barcodes/QR。
Capacity & scheduling：Active stock and stable mill slots enable firm dispatch dates tied to your shop window。
Protect the plate, speed your receiving, and keep freight predictable.
What you can expect
Export-grade packing：edge guards、strapping、blocking、anti-rust paper or oil、interleaving for coated plates
Stencil & labels：grade / heat / size / PO to accelerate booking-in
Shipping：containerized or flatbed；documentation pack（CI/PL/B/L，CO as applicable）
MOQ：5 tons；mixed grades/container loads to optimize landed cost
Incoterms：FOB / EXW / CIF per your preference
Extras：anti-slip mats、humidity indicators、special lifting instructions
Quick Table
| Topic | Default | Options |
|---|---|---|
| Packing | Seaworthy, edge-protected | Vacuum wrap, VCI paper |
| Marking | Stencil + barcode/QR | Custom logo/ERP label |
| Inspection | Vendor QC + MTC | SGS/BV/TÜV witness |
| Freight | FOB/EXW/CIF | DDP/door-to-site (enquire) |
Girders & floorbeams：predictable yield simplifies sizing；long CTL reduces field joints and erection time。
Deck plates & wearing surfaces：consistent thickness improves paving uniformity；blasted & primed plates compress coating schedules。
Bracing, diaphragms, gussets：flatness and clean edges reduce fit-up time；holes land where the model says they should。
Base plates & bearings：machinability supports precise grout pockets and alignment。
A brief field story：A coastal overpass rehab mandated overnight closures. Pre-beveled, blasted-and-primed a36 plate arrived with heat-numbered bundles matched to the cut list. Crews lifted, tacked, and sealed without re-blast. No shim hunt at bolt-up, no surprise camber—traffic reopened before dawn.
Schedule certainty：stocked sizes + stable mill capacity = reliable dispatch dates you can plan around。
One-PO simplicity：cutting、bevel、drilling、blast-prime handled under one order。
Compliance support：grade mapping、welding guidance、coating compatibility notes included in tender packs。
Transparent paperwork：MTCs, inspection records, and barcode traceability keep auditors comfortable。
Global trade fluency：flexible Incoterms、seaworthy packing、and third-party inspection on request。
Q1: Can Q235 and ASTM A36 be mixed in one bridge package?
Yes—commonly for non-fracture-critical parts. We supply a mapping sheet and align CVN/UT where required so inspectors sign off with confidence.
Q2: Which finish is best for coastal jobs?
Shot-blasted + zinc-rich primer or full galvanizing for splash/salt zones; we match the coating system to your corrosion category and maintenance strategy.
Q3: Do you provide CVN and UT?
Yes. CVN temperature/energy per spec; UT per your level and scan plan. Results are included in the MTC/inspection dossier.
Q4: How do you ensure weldability?
Controlled chemistry, disclosure on MTC, and heat-to-bundle traceability. Weld coupons for PQR can be supplied if your WPS is being qualified.
Q5: What lead time should I plan for?
Stocked specs ship fast; CTL and processing depend on the cut map and coating. We quote a firm dispatch date with your PO.
Zhongjing Steel Group (Guangdong) Co.,Ltd. specializes in the production of cold-rolled/hot-rolled coils, carbon steel pipes, bars, and PPGI materials. It is a modern enterprise integrating carbon steel production, processing, and trade. It is a Chinese iron and steel enterprise group.
