PPGI · PPGL · RAL · 0.3–1.2 mm · width 1 000–1 250 · GOST 34180
Colour-coated coil
Prepainted coil PPGI and PPGL on a galvanized or aluminium-zinc base, polyester and PVDF, RAL colours, 0.3–1.2 mm
DX51D+Z · Z100–Z275 · 0.3–3 mm · width 1 000–1 500 · GOST 14918
Galvanized coil
Hot-dip galvanized coil DX51D+Z with zinc weight Z100–Z275, 0.3–3 mm thick, for profiled sheeting, ventilation and profiles
GOST 14918-2020GB/T 2518-2019EN 10346:2015ASTM A653/A653MJIS G3302:2019DX51D+ZDX52D+ZDX53D+ZS250GD+ZS280GD+ZS350GD+ZSGCC
Parameters
| Parameters | |
|---|---|
| Thickness | 0.3–3.0 mm |
| Width | 1 000–1 500 mm; common 1 000, 1 250 |
| Base grade | DX51D, DX52D, DX53D, S250GD, S280GD, S350GD |
| Zinc class | Z100, Z140, Z180, Z200, Z275 g/m² both sides |
| Spangle | normal (N) or minimized (M) |
| Surface treatment | passivation, oiling, passivation with oiling; untreated to specification |
| Coil inside diameter | 508 or 610 mm |
Sizes and weight
| t, mm | Weight, kg/m² | Sheet 1 500×6 000, kg |
|---|---|---|
| 0.3 | 2.36 | 21.2 |
| 0.4 | 3.14 | 28.3 |
| 0.5 | 3.93 | 35.3 |
| 0.6 | 4.71 | 42.4 |
| 0.7 | 5.49 | 49.5 |
| 0.8 | 6.28 | 56.5 |
| 1 | 7.85 | 70.6 |
| 1.2 | 9.42 | 84.8 |
| 1.5 | 11.8 | 106 |
| 2 | 15.7 | 141.3 |
| 2.5 | 19.6 | 176.6 |
| 3 | 23.5 | 212 |
Theoretical weight at steel density 7.85 g/cm³. Actual batch weight is by scale and mill certificate.
Description
Galvanized coil is cold-rolled strip coated with zinc on a continuous hot-dip galvanizing line: the strip is annealed in a protective atmosphere, passed through a bath of molten zinc, and air knives wipe off the surplus metal down to the specified coating weight. The coating is designated by class as the weight on both sides: Z100, Z140, Z180, Z200, Z275 g/m². At a zinc density of 7.14 g/cm³, class Z275 corresponds to roughly 19 µm per side and Z100 to roughly 7 µm. After the bath the surface is passivated and oiled to specification.
The base grades differ by purpose. DX51D is steel for bending and roll forming, DX52D–DX54D are for drawing with increasing ductility; S250GD, S280GD and S350GD are structural grades with a specified yield strength for load-bearing profiled sheeting and light-gauge steel framing. GOST 14918 designates the same groups by intended use of the product — for roll forming, for pressing, structural — together with the zinc class. At mills in China the base is rolled to GB/T 2518, and the grade designations coincide with EN 10346. The spangle is regular or minimised, chosen to suit subsequent painting.
Inspection at the mill before shipment: thickness with a micrometer on the outer wrap at the edges and in the middle of the width (the measurement includes the coating), width with a tape, uniformity of the spangle, absence of bare spots, runs, white rust and roll slip marks. The mill test certificate (MTC) is checked against the heat number on the tag: base grade, zinc class with the result of the triple-spot coating weight test, chemical composition, mechanical properties. Marking, the moisture-proof wrapping and the strapping are checked. The weight in the calculated table below is for bare steel; the zinc weight is added by class: Z275 — 0.275 kg/m².
Applications
- unpainted profiled sheeting and metal roof tiles
- light-gauge steel framing and thermal profiles
- air ducts and ventilation casings
- cable trays, trunking, switchboard components
- rainwater systems, flashings, roofing trim
- base for colour-coated coil
Packing and shipment
The coil is wrapped in moisture-proof paper and steel sheet, the end faces are closed with protective rings, strapped with steel band around the circumference and through the eye; mill tag with heat number, grade, zinc class, thickness, width and weight.
Grade equivalents
| GOST | GB (China) | ASTM | EN | Note |
|---|---|---|---|---|
| St3sp | Q235B | A1011 CS Type B / A36 | S235JR | Correspondence by mechanical properties; the chemical composition and impact toughness requirements differ between the standards — check against the MTC. |
| 09G2S | Q355B (Q345B) | A572 Grade 50 | S355JR | Nearest analogue: yield strength is comparable, but 09G2S carries more manganese and silicon alloying. |
| 08ps | DC01 / SPCC | A1008 CS Type B | DC01 | Cold-rolled low-carbon steel for general use; deep drawing calls for DC03–DC04 or 08Yu. |
| 08ps ZN (GOST 14918) | DX51D+Z | A653 CS Type B | DX51D+Z | Galvanized base for bending and roll forming; the zinc class is specified separately (Z100–Z275). |
| 250 / 350 (GOST 14918) | S250GD+Z / S350GD+Z | A653 SS Grade 37 / 50 | S250GD+Z / S350GD+Z | Structural galvanized grades with a specified yield strength; ASTM SS is the nearest analogue by strength. |
| 08Kh18N10 | 06Cr19Ni10 | 304 | 1.4301 | Austenitic chromium-nickel steel; the GOST grade allows a higher carbon content than 304L. |
| 03Kh17N14M3 | 022Cr17Ni12Mo2 | 316L | 1.4404 | Molybdenum-bearing low-carbon austenitic steel; close correspondence. |
| 12Kh17G9AN4 | 12Cr17Mn6Ni5N | 201 | 1.4372 | Nearest analogue: chromium-manganese steel with nitrogen, nickel partly replaced by manganese; corrosion resistance is lower than that of 304. |
Equivalents are the closest match, not identical: chemistry and tolerances differ between standards. The exact grade and standard are written into the contract.
Related items
DC01 · 08ps · SPCC · 0.4–3 mm · width 1 000–1 500 · GOST 19904
Cold-rolled coil
Cold-rolled annealed coil in DC01, 08ps and SPCC, 0.4–3 mm thick, for pressing, painting and galvanizing
St3sp · Q235B · DC01 · 0.5–6 mm · width 20–630 · GOST 6009
Slit strip
Strip slit lengthwise from coil, 20–630 mm wide and 0.5–6 mm thick, for electric-welded tube, profiles and banding
Buyer questions
How to read a mill test certificate (MTC) for coil
Four blocks in the certificate must agree: the heat number and coil number with the tag on the coil; the grade and standard with the specification; the chemical composition with the limits of the standard for that grade; the mechanical properties (yield strength, tensile strength, elongation) with the values required by the standard. For galvanized coil the zinc coating weight is added, for colour-coated coil the type and thickness of the paint layer. The bureau checks the MTC against the heat at the mill before shipment and hands over the original with the batch.
How hot-rolled coil differs from cold-rolled
Hot-rolled coil is rolled above the recrystallisation temperature: thickness from 1.5 mm, surface with mill scale, wider thickness tolerance. Cold-rolled coil is made from hot-rolled by pickling and cold reduction followed by annealing: thickness from 0.3 mm, smooth surface, tighter tolerance, and the steel is more ductile after annealing. Welded tube, profiles and structures take hot-rolled; pressing, body panels, galvanizing and painting take cold-rolled.
How coil tonnage is calculated
The theoretical weight of one square metre is 7.85 kg per millimetre of thickness; the coil weight is the strip area multiplied by that figure. Shipment and payment go by the actual weight from weighing, recorded in the certificate and on the tag; the difference from the theoretical weight comes from the thickness tolerance. The specification states tonnes, not the number of coils, and separately the maximum weight of one coil and the inside diameter to suit your decoiler.
What the bureau inspector checks at the mill before shipment
Thickness with a micrometer on the outer wrap at several points across the width and on the coil end face; width with a tape; telescoping and tightness of winding; condition of the edge and surface; the heat number on the tag against the MTC; for galvanized coil the uniformity of the coating and absence of bare spots, for stainless coil the grade with a positive material identification (PMI) analyser; packing and strapping. The result is an inspection report with photographs. Rejects recorded in the report are replaced; the replacement is supplied by the mill under its contract with the bureau.
How the batch is sized
The batch is sized to your volume — send your specification: grade and standard, thickness with tolerance, width, surface condition, for coated coil the zinc class and polymer type with the RAL colour, plus the inside diameter and maximum weight of a coil. Mills roll coil to order by width and thickness, so the more precise the specification, the fewer approvals are needed. The bureau selects a mill for that specification and returns confirmed delivery terms.
Price request
Send your specification and we will quote your batch
Steel pricing depends on grade, size, tonnage and delivery terms on the day of contract. A number on the page would be wrong by the time you read it.
Request received