Sino Steel supplies galvanized, Galvalume, PPGI and PPGL steel products in coil, sheet, pipe, box tube and profiled roofing forms. As a coated steel manufacturer and supplier, we match the base steel, metallic coating, paint system, product form, factory processing and export packing to the buyer's final use.
“Coated steel” can mean different material systems. Start by deciding whether the order needs zinc coating, aluminum-zinc coating or an organic paint system over one of those metallic-coated substrates.
Zinc coating is the principal metallic-coated route. The final product can be supplied as flat steel, round pipe or structural box tube depending on the manufacturing route.
Uses the specified aluminum-zinc metallic-coated substrate rather than conventional GI zinc coating. Coil and cut sheet routes are separated by the buyer's downstream processing requirement.
Adds an organic paint system over a metallic-coated substrate. PPGI uses galvanized steel; PPGL uses the specified Galvalume / Al-Zn substrate route.
The coating system and product form are separate decisions. A buyer who needs roofing panels should not be routed to the same quotation logic as a buyer purchasing master coil, round pipe or square structural tube.
Galvanized supply routes for flat steel, round pipe and structural tubing.
Master or slit coil where zinc coating, coil configuration, surface treatment and downstream forming matter.
View Galvanized Coil →Cut-to-length sheet and blanks where flatness, diagonal, squareness, cut edge and stack packing become finished-product requirements.
View Galvanized Sheet →Round galvanized pipe where OD, wall thickness, end condition, weld seam and actual galvanizing route should be confirmed together.
View Galvanized Pipe →Square and rectangular tubing where section dimensions, wall thickness, corner radius, diagonal, twist and coating route must stay consistent.
View Galvanized Box Tube →Galvalume flat-steel routes based on the specified aluminum-zinc metallic coating.
Master and slit coil where the Al-Zn coating route, surface, coil dimensions and downstream forming should be confirmed before quotation.
View Galvalume Coil →Cut-to-length Galvalume sheet where flatness, squareness, cut edge, wet-storage protection and stack traceability matter.
View Galvalume Sheet →Organic paint systems built on the correct metallic-coated substrate, including finished roofing profiles.
Prepainted galvanized coil where zinc coating, PE / SMP / HDP / PVDF route, RAL color, gloss and forming requirement should be linked.
View PPGI Coil →Prepainted Galvalume coil where Al-Zn substrate, paint system, color, gloss, slitting and profiling requirements belong to one purchasing route.
View PPGL Coil →PPGI or PPGL feedstock roll-formed into corrugated, trapezoidal or project-specific roofing and cladding profiles.
View Roofing Sheet →GI, Galvalume, PPGI and PPGL describe different layer combinations. The same color or finished shape does not make the underlying material route equivalent.
Color belongs to the organic coating layer; the galvanized or Galvalume substrate route underneath it still needs to match the purchase order.
If the buyer is unsure which coated-steel page to use, the easiest route is to start from what will arrive at the factory or jobsite.
Choose GI, Galvalume, PPGI or PPGL according to the required substrate and coating system.
View Coil Routes →Choose galvanized sheet or Galvalume sheet when the buyer needs cut flat material rather than master coil.
View Sheet Routes →Use galvanized steel pipe when round section, OD / WT and pipe-end requirements control the RFQ.
View Pipe →Use galvanized box tube when section size, corner radius, diagonal and twist are part of the order.
View Box Tube →Use the profiled-sheet route when cover width, rib height, pitch and finished length are already required.
View Roofing Sheet →The collection page only shows common reference families. Final standard selection should follow the actual product form, substrate, coating route and project requirement.
| Product / Route | Common Reference | Page Logic |
|---|---|---|
| Galvanized Flat Steel | ASTM A653/A653M + ASTM A924/A924M | Zinc-coated flat steel in coil or cut-length routes. |
| Galvalume Flat Steel | ASTM A792/A792M + ASTM A924/A924M | 55% aluminum-zinc alloy-coated flat steel route. |
| Prepainted Metallic-Coated Steel | ASTM A755/A755M | Organic coil coating over the specified hot-dip metallic-coated substrate. |
| European Metallic-Coated Flat Steel | EN 10346 | Continuously hot-dip coated flat products, including zinc and AZ routes as applicable. |
| European Organic-Coated Flat Steel | EN 10169 | Continuously organic coated / coil-coated steel flat products. |
| Galvanized Round Pipe | ASTM A53/A53M or applicable EN pipe route | Pipe standard and galvanizing / coating route must match the actual order. |
| Galvanized Structural Tube | ASTM A500/A500M base tube; A1057/A1057M or A1076/A1076M where applicable | Different manufacturing and coating routes should not be treated as one generic galvanized box-tube standard. |
Flat sheet, pipe and structural tubing have different dimensional, manufacturing and coating requirements even when the final surface is described as galvanized.
A useful RFQ should define both the material system and the product form. This prevents quotations that match only one part of the requirement.
Coil, sheet, pipe, box tube or profiled roofing sheet.
GI, Galvalume, PPGI, PPGL or the full specified grade / substrate route.
Thickness, width, length, OD × WT, section dimensions or finished profile.
Zinc, Al-Zn, paint system or other specified metallic / organic coating requirement.
RAL, gloss, matt, texture, surface treatment or protective film where applicable.
MT, coils, sheets, pieces or m² plus destination country / port.
Color is relevant to prepainted products, not to every coated-steel route. For PPGI, PPGL and color coated roofing sheet, confirm the physical color reference together with paint system and surface appearance.
Send the RAL reference already specified by the buyer or project.
Use an approved physical sample or retained sheet where color continuity matters.
The same nominal color can appear different at another gloss level or surface texture.
Coated-steel manufacturing is not one universal process. The mill material, coating route and order-dependent factory processing should stay connected to the final product.
Confirm zinc or Al-Zn coating before the material is treated as GI, Galvalume, PPGI or PPGL.
For PPGI and PPGL, keep primer, top paint, back paint, color and gloss linked to the approved paint system.
Order-dependent processing can include slitting, cut-to-length, pipe end preparation, tube cutting / drilling or roofing roll forming where specified.
Inspection changes with the form: coil winding, sheet flatness, pipe geometry, box-tube twist or roofing-profile cover width.
A painted surface does not prove the substrate, and an MTC does not prove every finished processing dimension. Inspection should follow the layer and feature created by each manufacturing stage.
Confirm grade, thickness and base dimensions from the correct material and order documents.
Confirm the coating route and applicable coating designation or test basis separately from paint color.
Where applicable, review color, gloss, paint-film requirement and approved sample separately from the metallic substrate.
Check the actual coil, sheet, pipe, box tube or roofing profile after slitting, cutting, forming or end processing.
A mother-coil certificate cannot prove a roofing profile's effective cover width, and a paint record cannot prove a box tube's diagonal or twist.
The identity chain should continue from mill material through metallic coating, paint where applicable, factory processing, finished package and shipment documents.
For PPGI and PPGL, the approved color reference should remain connected to the same finished coil or roofing stack as the underlying substrate records.
A painted roofing stack, galvanized pipe bundle and master coil do not need the same physical protection. Factory packing should control the risks created by product shape, coating and shipment route.
Use stable support, edge protection, suitable banding and dry waterproof wrapping for master or slit coils.
Support sheet stacks on multiple level points and protect corners, cut edges and metallic-coated surfaces.
Use multiple straps, suitable contact protection and bundle geometry that limits movement during handling.
Support long sheets, protect painted surfaces and avoid band pressure concentrated directly on unsupported profile peaks.
Galvanized steel uses a zinc metallic coating. Galvalume uses the specified aluminum-zinc metallic coating. PPGI adds an organic paint system over galvanized steel, while PPGL adds an organic paint system over the specified Galvalume / Al-Zn substrate.
Choose the form that matches what you need delivered. Coil suits downstream processing lines; sheet suits flat cut products; pipe and box tube use tubular geometry; roofing sheet is already roll formed to a finished profile.
Yes. PPGI and PPGL color requirements can be discussed by RAL reference, approved physical sample or project standard together with the paint system, gloss and surface requirement.
Yes, suitable slitting and cut-to-length routes can be reviewed by order. Finished width, edge condition, traceability and packing should be confirmed after processing.
No. The MTC supports the material identity and test information within its scope. Paint, slitting, cutting, roll forming and other later processing create requirements that may need their own inspection or production records.
Send product form, base material or grade, dimensions, metallic coating, paint / color if applicable, quantity, destination and any processing, profile or packing requirement.
Product form, substrate, dimensions, coating, quantity and destination are enough to start. Add paint system, RAL color, profile, processing or packing details where they apply.
