Cold-rolled & coated sheet grades
9 cold-rolled & coated sheet grades from 3 designation systems, each with a full data sheet. Sorted by system; the yield and tensile values are the first line of each grade's mechanical table.
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EN (European)
| Grade | No. | Type | C % | Yield MPa | Tensile MPa | Equivalents |
|---|---|---|---|---|---|---|
| DC01 | 1.0330 | Cold-rolled low-carbon steel for cold forming | ≤ 0.12 | 140–280 | 270–410 | CS Type B, SPCC, DC01 |
| DD11 | 1.0332 | Hot-rolled low-carbon steel for cold forming | ≤ 0.12 | 170–360 | ≤ 440 | CS Type B (A1011), SPHC, Q195 / SPHC |
| DX51D | 1.0226 | Hot-dip coated low-carbon steel for bending and profiling | ≤ 0.18 | — (no minimum; typ. 200–320) | 270–500 | CS Type B (A653), SGCC, DX51D+Z |
| DX52D | 1.0350 | Hot-dip coated low-carbon steel for drawing | ≤ 0.12 | 140–300 | 270–420 | dx51d, sphc, s250gd |
| S250GD | 1.0242 | Hot-dip coated structural steel, guaranteed 250 MPa yield | ≤ 0.2 | 250 | 330 | SS Grade 37 (A653), SGC340, S250GD+Z |
| S280GD | 1.0244 | Hot-dip coated structural steel, guaranteed 280 MPa yield — the purlin grade | ≤ 0.2 | 280 | 360 | SS Grade 40 (A653), SGC400, S280GD+Z |
| S350GD | 1.0529 | Hot-dip coated structural steel, guaranteed 350 MPa yield — deck and long-span profiles | ≤ 0.2 | 350 | 420 | SS Grade 50 (A653), SGC440, S350GD+Z |
JIS (Japan)
| Grade | No. | Type | C % | Yield MPa | Tensile MPa | Equivalents |
|---|---|---|---|---|---|---|
| SPHC | Hot-rolled mild steel sheet and strip for commercial and drawing quality | ≤ 0.15 | not specified | ≥ 270 | DD11, DD12, DD13 |
DIN (superseded German)
| Grade | No. | Type | C % | Yield MPa | Tensile MPa | Equivalents |
|---|---|---|---|---|---|---|
| St 22 | 1.0332 | Withdrawn DIN designation for hot-rolled mild steel sheet for cold forming | ≤ 0.12 | ≈ 240 | 340–420 | DD11, SPHC, A1011 CS Type B |
Formability is the property being sold
For cold-rolled and coated sheet, the grade does not promise strength — it promises how far the sheet can be deformed before it splits. DC01 bends. DC03 draws. DC04 deep-draws. DC05 and DC06 go into automotive outer panels where the shape is severe and the surface must stay perfect.
The measurable properties behind those words are the r-value (resistance to thinning, higher is better for drawing) and the n-value (strain hardening, which spreads deformation instead of concentrating it). DC06 guarantees r90 ≥ 2.1; DC01 guarantees nothing at all.
Coated grades split into two families
EN 10346 runs two parallel series and they are not interchangeable. DX51D to DX54D are forming grades, sorted exactly like the cold-rolled series — DX51D bends, DX54D deep-draws. S220GD to S350GD are structural grades with a guaranteed yield, for profiles that carry load: purlins, decking, framing.
Asking for "galvanized sheet" without naming one of these is the commonest cause of a wrong delivery. If the part is pressed, name a DX grade; if it carries load, name an S grade and the yield.
Surface and coating are separate specifications
Beyond the grade, a flat product order carries three more decisions. Surface quality A or B — B is the sorted, defect-free side for visible painted work. Coating class for coated products — Z100 to Z600 grams of zinc per square metre over both faces. Treatment — chemically passivated (C), oiled (O) or both.
A sheet ordered as DX51D alone is underspecified. DX51D+Z275, surface B, treatment C is an order.
faq.h
What is the difference between DC01 and DC04?
Formability. DC01 is a general bending quality with no guaranteed r-value; DC04 guarantees r90 ≥ 1.6 and higher elongation for genuine deep drawing. The chemistry difference is small; the sorting and the guarantee are what you pay for.
What does DX51D mean?
The base forming grade of EN 10346 hot-dip coated flat steel — a low-carbon bending quality with no guaranteed yield strength. The D suffix indicates it is intended for cold forming, and +Z indicates a zinc coating.
What is the difference between DX51D and S280GD?
DX51D is a forming grade specified by how well it bends; S280GD is a structural grade guaranteed to 280 MPa yield. They serve different jobs and are not substitutes.
What does Z275 mean?
275 grams of zinc per square metre counting both faces, about 20 µm per side. It is the common export class for roofing and outdoor use; Z100 and Z140 are indoor and general classes.
What is the r-value in sheet steel?
The plastic strain ratio — a measure of how much a sheet resists thinning while it is drawn. A higher r-value means the metal flows from the flange rather than the wall, which is exactly what a deep draw needs.