Question 1

What is the difference between zero spangle regular spangle and big spangle galvanized steel coil

Accepted Answer

Zero spangle has no visible zinc crystal pattern for smooth painting surface regular spangle has uniform small flower pattern for general use big spangle has large visible flower pattern for traditional roofing application

Question 2

What is the difference between hot dipped galvanized and electro galvanized steel coil

Accepted Answer

Hot dipped galvanized has thicker zinc coating from 40g to 275g for outdoor heavy corrosion resistance while electro galvanized has thinner coating from 20g to 60g for indoor light use and better surface appearance

Question 3

What base materials do you offer for galvanized steel coil

Accepted Answer

We offer DX51D SGCC Q195 Q235B for commercial and forming use and S250GD S350GD S550GD for structural high strength requirement

Question 4

What zinc coating weight is suitable for outdoor use

Accepted Answer

For outdoor exposed environment we recommend zinc coating 180g to 275g per square meter with chromate passivation for salt spray resistance up to 480 hours

Question 5

What surface treatments are available for galvanized coil

Accepted Answer

We offer chromated passivated for corrosion resistance non chromated for environmental requirement oiled for storage protection non oiled for welding dry surface for painting and anti fingerprint for appliance grade

Question 6

What thickness and width range can you supply for galvanized steel coil

Accepted Answer

Thickness from 0 12mm to 4mm and width from 600mm to 1500mm with mill edge or trimmed edge slitting service available for narrow width from 300mm

Question 7

Do you provide skin pass or temper rolling treatment on galvanized coil

Accepted Answer

Yes skin pass improves flatness surface finish and eliminates yield point elongation for better deep drawing and roll forming performance

Question 8

Do you provide mill test certificate for galvanized steel coil

Accepted Answer

Yes each shipment comes with EN10204 3 1 mill test certificate showing chemical composition mechanical properties zinc coating thickness and surface treatment details

Question 9

What is your delivery time and minimum order quantity for galvanized coil

Accepted Answer

Delivery time is 15 to 25 days for stock sizes and 25 to 35 days for custom order minimum order quantity is 25 tons for one container and small trial order is welcome

Question 10

Do you accept third party inspection before shipment

Accepted Answer

Yes we accept SGS BV TUV Intertek and any other third party inspection at buyer cost before loading to ensure quality and specification compliance

Question 11

What spangle types do you offer and which one suits my application?

Accepted Answer

We offer zero spangle for smooth painting surface, regular spangle for general construction use, and big spangle for traditional exposed roofing appearance. Zero spangle suits automotive and appliance panels, regular spangle fits standard building materials, and big spangle works best for rural roofing and agricultural structures.

Question 12

Can galvanized coils be painted or powder coated directly after delivery?

Accepted Answer

For best adhesion, we recommend degreasing and pre-treatment before painting. Zero spangle and skin-passed surfaces offer superior paint grip. Regular spangle requires light surface preparation. We also offer chromate-free and anti-fingerprint treatments specifically designed for direct powder coating application.

Question 13

What edge types are available and how does edge quality affect downstream processing?

Accepted Answer

We supply mill edge for general shearing and trimming, and slit edge for precision roll forming and stamping. Slit edge eliminates burrs and ensures consistent width tolerance within plus or minus 0.5mm, reducing die wear and material waste during high-speed roll forming or deep drawing operations.

Question 14

Do you offer pre-painted or color-coated galvanized coils as value-added options?

Accepted Answer

Yes, we offer pre-painted galvanized coils with polyester, PVDF, or epoxy coatings in standard RAL colors. Coating thickness ranges from 15 to 25 microns on top side and 5 to 8 microns on reverse side, suitable for roofing, wall cladding, and household appliance panels with excellent UV resistance and color retention.

Question 15

What payment terms and trade incoterms do you accept for galvanized coil orders?

Accepted Answer

We accept T/T, L/C at sight, and D/P for payment terms. For trade incoterms, we offer FOB, CIF, CFR, and EXW from main Chinese ports including Qingdao, Tianjin, and Shanghai. T/T with 30 percent deposit and 70 percent balance against BL copy is our standard arrangement for regular customers.

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