Schedule 40 vs Schedule 80 Steel Pipe: How to Choose the Right Wall Thickness
Explore galvanized steel pipe sizes, OD, wall thickness, and schedule 40 charts. Learn how to measure galvanized pipe size and astm a53 specifications.
By Luyuan Steel Technical Team | Updated August 18, 2026
Galvanized steel coil price is built from the base steel, zinc coating, dimensions, order quantity, processing, inspection, freight, and trade terms. A public listing range can frame a conversation, but it cannot replace a grade-specific quote. This guide shows which numbers to request before comparing supplier offers.
Information basis: The examples below use Luyuan Steel’s published product parameters and price references. ASTM A653/A653M-23 is the relevant ASTM specification for hot-dip zinc-coated steel sheet; the standard, edition, and coating designation must be written into the purchase contract.
A useful quote identifies the product before it shows a number. “Galvanized coil” can describe different base grades, widths, thicknesses, zinc masses, surface finishes, coil weights, and delivery terms. Two offers with the same price per metric ton may not deliver the same usable material.
| Quote field | Example to specify | Why it changes the price |
|---|---|---|
| Base grade and standard | DX51D or SGCC; ASTM A653/A653M-23 or another agreed standard | Strength, formability, chemistry, test scope, and mill route differ by grade |
| Thickness and width | 0.25 mm × 1,250 mm, with tolerance | Gauge affects mass, yield, rolling schedule, and cutting loss |
| Zinc coating | Z120, Z180, or a contract-defined coating mass | More zinc adds material, bath, control, and inspection cost |
| Surface and finish | Regular spangle, zero spangle, skin-passed, oiled, or dry | Surface control and downstream appearance requirements add processing steps |
| Coil size | 508 or 610 mm ID, maximum OD and coil mass | Slitting, recoiling, handling, and equipment limits affect yield |
| Order quantity | Trial coil, one container, or annual call-off | Setup, production planning, packaging, and mill minimums are spread differently |
| Delivery terms | EXW, FOB, CIF, or another Incoterm and destination port | Freight, insurance, port charges, and currency exposure move the landed number |

Luyuan’s public materials place selected steel products in an indicative range of approximately USD 410–650 per metric ton. The same source lists examples such as PPGI/PPGL at approximately USD 460–650/MT, cold rolled steel coil at USD 585–635/MT, galvanized steel pipe at USD 608–623/MT, and H-beam steel at USD 440–568/MT.
| Published reference category | Indicative listing range | How to use it |
|---|---|---|
| Selected Luyuan steel products | Approximately USD 410–650/MT | Broad market context only; do not treat it as a galvanized coil offer |
| PPGI/PPGL steel coil | Approximately USD 460–650/MT | Painted or galvalume products have different inputs and processing |
| Cold rolled steel coil | Approximately USD 585–635/MT | Useful for comparing another flat-steel family, not for substituting a GI quote |
| Galvanized steel pipe | Approximately USD 608–623/MT | Pipe forming and coating costs make it a separate product benchmark |
| H-beam steel | Approximately USD 440–568/MT | Section steel has different rolling, mass, and logistics economics |
Products without a verified public listing price should be marked Price on Request. A galvanized steel coil quote should therefore be issued after the supplier confirms the grade, zinc coating, dimensions, quantity, inspection, and destination rather than copying a number from another product family.
Luyuan’s published GI coil listing identifies DX51D/SGCC grades, a Z120 zinc coating, and a thickness range of 0.18–0.30 mm. Its galvanized steel coil catalog also describes customized width, coating, processing, and packaging at the company/service level. These are useful starting points for an RFQ, not a promise that every combination is available at every quantity.
The site separately lists galvalume coil at 0.21–0.50 mm with coating references of Z121–Z180. Galvalume and galvanized steel are not interchangeable price labels: the coating chemistry, surface requirement, and intended application must remain explicit.
See the current GI coil product page and galvanized steel coil catalog when preparing a specification request.
Steel index movements set the starting point, but grade determines what the mill must melt, roll, test, and certify. A forming grade, structural grade, and appliance-grade surface requirement should not be compared as if they were one commodity.
A Z120 requirement does not carry the same input as a heavier coating. Specify whether the coating designation is total both sides, per side, or another convention under the agreed standard. Ask how the supplier measures and records coating mass.
Thin material can require tighter rolling control, while wide or non-standard widths can increase setup and trimming loss. Put nominal dimensions and permitted deviation in the RFQ. Otherwise a low nominal price may hide a mismatch with the customer’s decoiler or roll-forming line.
Skin pass, leveling, slitting, cut-to-length, oiling, protective film, and special surface appearance each add handling or inspection. State whether the coil will be painted, roll-formed, stamped, or used as exposed sheet so the supplier can quote the correct finish.
A one-coil trial, a container order, and a recurring call-off have different setup economics. Coil ID, maximum coil mass, eye orientation, waterproof wrapping, edge protection, and marking also affect packing and loading cost.
English MTCs, dimensional reports, coating tests, chemical and mechanical tests, SGS/BV/Intertek inspection, or buyer-appointed inspection can be included in the purchase scope. The cheapest quote may exclude a document or test that the receiving plant requires.
FOB, CFR, CIF, and EXW figures are not directly comparable. Add ocean freight, insurance, port charges, customs, inland haulage, financing, and currency assumptions before choosing the lower landed cost.

Compared with supplier pages that show only a “starting price,” a procurement comparison should normalize every offer into the same product and delivery basis. Use this sequence:
This method makes a higher nominal price explainable. It also catches the reverse problem: a low quote that quietly omits zinc mass, tolerance, testing, or destination charges.
Luyuan states that it supplies English Mill Test Certificates, batch traceability, 100% pre-shipment inspection, and third-party inspection support. Put those claims into an agreed inspection plan: identify the coil number, sampling location, dimensional points, coating method, surface acceptance, and document release condition.
For export cargo, check coil mass, eye orientation, skid or cradle design, wrapping, moisture protection, lifting points, and bundle marks. A price that excludes damage prevention can become more expensive when the receiving line finds edge dents, rust, telescoping, or unreadable traceability marks.
For more about supplier capability and inspection resources, see Luyuan’s capability page and the existing galvanized steel coil grades guide.
There is no single verified public price for every galvanized coil specification. Luyuan’s selected steel listing references are approximately USD 410–650/MT, while the final GI coil number depends on grade, dimensions, zinc coating, quantity, testing, Incoterms, and destination.
It normally adds zinc input and process control, but the final difference also depends on base steel, width, order size, and market conditions. Compare coating designations under the same standard and measurement convention.
No. PPGI adds paint layers and color or surface requirements, while GI uses a zinc coating without the same prepainting process. Use PPGI/PPGL references only as context, not as a GI quotation.
Include grade and standard, thickness, width, tolerance, zinc coating, surface finish, coil ID and mass, quantity, processing, inspection, packaging, Incoterm, destination, and required delivery date.
CIF includes freight and insurance to the named port, while EXW transfers more work and cost to the buyer. Compare landed cost using the same destination and customs assumptions.
Next step: Send the required grade, thickness, width, zinc coating, quantity, inspection scope, destination port, and Incoterm through Luyuan’s contact page for a specification-based galvanized steel coil quotation.
Luyuan Steel Technical Team supports steel manufacturing, processing, quality-control documentation, product specification, and international project supply.
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