Our C steel galvanized purlins are mainly used for roof and wall support systems in steel structure buildings. Treated via hot-dip galvanization, they feature excellent anti-corrosion properties and are suitable for construction sites requiring long-term corrosion resistance, especially high-humidity and severely corrosive environments. Besides, they are extensively adopted in various construction projects, including roof support systems for steel workshops and warehouses, as well as lightweight bridges, canopies and other corrosion-resistant structures.
We supply black or galvanized sections cut to your layout, pre-punched to your drawing, and bundled and labeled by group before loading from a single port. Around the member we also offer multi-section bills of materials, and an engineering line that confirms section, grade and holes against your drawing and returns a quote within 24 hours.
Engineering Performance & Design Notes
Two things decide how a ground-level support member behaves.
First, section geometry. A cold-formed C distributes load along its web and two flanges, and its modest weight keeps the dead load of the support frame small - important where the frame hangs off a formwork system or a foundation cradle.
Second, corrosion allowance. Because these members sit low, often near damp soil, standing water or curing concrete, hot-dip galvanizing adds a sacrificial zinc layer that protects the section long after a painted member would show edge rust.
The section is checked against the governing standard (per the ASTM / DIN / JIS / BS spec nominated on your drawing) for bending, deflection and web crippling at the support points, and wall thickness is chosen to suit the service rather than over-specified.
Galvanized C Steel Purlins Specification
| Item | Detail |
|---|---|
| Product name | Galvanized C steel purlin / support channel |
| Wall thickness | 0.8–4.0 mm |
| Section height / width | H 20–250 mm / B 40–360 mm (purlin range C80–C250) |
| Grade | Q195–Q345, S235JR, SS400, SPHC, 040A10 |
| Technique | Cold roll forming; hot-dip galvanizing on partner line |
| Surface | Black / hot-dip galvanized |
| Standard | ASTM / DIN / JIS / BS |
| Certificate | ISO, CE |
| Payment | 30% T/T deposit, 70% T/T within 5 days after B/L copy, or 100% Irrevocable L/C at sight |
| Delivery time | Within 20 days after receipt of deposit |
| Loading port | Xingang, China |
Material & Surface
| Option | Grade | Standard | Surface |
|---|---|---|---|
| Standard galvanized C | Q235B / SS400 / S235JR | ASTM / DIN / JIS | Hot-dip galvanized |
| Heavy / high-yield C | Q345B | GB / JIS | Galvanized or black |
| Light / general C | Q195 / SPHC / 040A10 | BS / JIS / GB | Black or galvanized |
Why Choose Our Galvanized C Steel Purlins?
Corrosion protection where it counts: hot-dip galvanizing (or a nominated zinc class) shields the section in humid, splash and ground-adjacent service, so the support list stays standing.
One C, wide coverage: C80–C250 with a full wall range lets one source cover the lightest trim through to heavy foundation framing on a single bill.
Grade matched to the job: Q195–Q345 plus S235JR / SS400 / SPHC / 040A10 means the yield is chosen for the service, not over-bought.
Practical supply terms: black or galvanized, cut to your layout, bundled by group, freight from a single loading port - and small quantities accepted.
Applications of Galvanized C Steel Purlins
Construction Sites
Galvanized C steel purlins are widely used in the construction industry, mainly for roof support systems of steel workshops and warehouses. They provide solid support to secure the safety and structural stability of buildings.
Municipal Engineering
In municipal projects, galvanized C steel purlins are commonly applied to lightweight bridges, canopies and other structures requiring corrosion protection. Thanks to superior anti-corrosion and wear-resistant features, they perform reliably in such working conditions and enjoy an extended service life.
Machinery Manufacturing
Galvanized C steel purlins are also utilized for equipment supports and framework structures within the machinery manufacturing industry. They offer stable supporting performance to guarantee safe and normal operation of relevant equipment.
Galvanized C Steel Purlins Sectionsize
|
Type |
Sectionsize (mm) |
||||
|
H |
B |
B |
C |
t |
|
|
C80 |
80 |
40 |
40 |
15 |
2.0-3.0 |
|
C100 |
100 |
50 |
50 |
20 |
2.0-3.0 |
|
C120 |
120 |
50 |
50 |
20 |
2.0-3.0 |
|
C140 |
140 |
50 |
50 |
20 |
2.0-3.0 |
|
C150 |
150 |
60 |
60 |
20 |
2.0-3.0 |
|
C160 |
160 |
60 |
60 |
20 |
2.0-3.0 |
|
C180 |
180 |
60 |
60 |
20 |
2.0-3.0 |
|
C200 |
200 |
60 |
60 |
20 |
2.0-3.0 |
|
C250 |
250 |
70 |
70 |
20 |
2.0-3.0 |
Manufacturing & Quality System
Production Flow
Bill & cutting plan – sections, lengths and hole positions are listed from your framing drawing.
Coil material check – the coil is re-tested for chemistry and yield to the chosen grade.
Slit to width (as required) – the coil is slit to the strip width the C section dictates.
Cold roll forming – the strip is cold-formed into the C section on our roll former.
Pre-punch & cut to length – bolt holes are punched and lengths cut to your layout.
Hot-dip galvanizing – galvanized members are dipped on our qualified partner galvanizing line for full coverage including cut edges.
Final inspection & bundling – section symmetry, holes and zinc coverage are checked before bundling.
Quality Control
| Control point | Method | Document |
|---|---|---|
| Coil material | Chemistry / yield re-test to grade | Coil MTC |
| Section geometry | Section & wall dimension gauge | Inspection record |
| Hole positions | Bolt-hole layout check | Inspection record |
| Zinc layer | Coating thickness & coverage | Galvanizing report |
Third-party inspection (SGS / BV / TÜV) available on request.
Our Projct Export Cases
| Project | Region | Application | Spec |
|---|---|---|---|
| Warehouse foundation stiffening | Bangladesh | Formwork stiffening ribs + cradles | C160×2.5, 5,200 pcs |
| Coastal plant equipment stands | Philippines | Galvanized equipment cradles | C180×3.0, 3,600 pcs |
| Plinth & slab-edge framing | UAE | Ground-level corrosion-exposed trim | C120×2.0, 4,100 pcs |
| Pump-house pipe supports | Australia | Galvanized pipe support frames | C140×2.0, 2,800 pcs |
Packing & Delivery
| Category | Detail |
|---|---|
| Packing | Bundles (approx. 8 per lot) tightened with metal belt and plastic-wrapped as required; corner protection for cut edges and zinc. |
| Delivery | 20″/40 GP/HC containers by length from the loading port; bundles chocked and braced in container. |
| Lead time | Within 20 days after receipt of deposit |
| Marking | Bundle labels: section, grade, quantity, weight, port mark. |
| Documents | MTC, packing list, invoice, galvanizing/inspection report (on request), erection drawing. |
FAQ:
Is the galvanizing really hot-dip?
Yes - galvanized members are dipped on a dedicated partner hot-dip galvanizing line, giving full coverage including cut edges and corners; black members skip this step.
Can these channels be cut and drilled on site?
They are supplied cut to your layout, but plain lengths and plain (unpunched) members are available if your site prefers to cut and drill in place.
Can galvanized members be welded?
Yes, but weld only in a ventilated area - galvanizing fumes are harmful - and brush the weld and heat-affected zone with a zinc-rich paint afterwards, because welding burns the zinc locally. For bolted joints you simply touch up any scribed or rubbed spots.
What is the longest single length available?
Members are cut to container-friendly lengths - up to roughly 6 m on a 20 ft and 12 m on a 40 ft container - so every run arrives as planned lengths.
How do I specify how much zinc I need?
Zinc is normally specified by the galvanizing standard (e.g. ISO 1461 / GB/T 13912) or as a coating mass in g/m². For humid or splash service we would point toward the higher end of the standard range; tell us the environment and we confirm a suitable class.
