Materials & grades
DX51D+Z / 1.0226 galvanized steel sheet (EN 10346; ASTM A653 CS, IS 277 GP, JIS SGCC)
DX51D+Z (1.0226) is the commercial-quality hot-dip galvanized sheet steel of EN 10346, used for roofing, cladding, ducting and other parts that are bent or roll-formed but not deep drawn. Its nearest names are ASTM A653 CS Type B, IS 277 GP or GPL and JIS G 3302 SGCC, and the zinc coating is ordered separately (Z275 means 275 g/m² of zinc, total on both sides).
Names by standard
What it is called in each region
| Region | System | Designation | Standard | Match |
|---|---|---|---|---|
| USA | ASTM A653/A653M | CS Type BCommercial steel. Type B holds carbon at 0.02–0.15 % to avoid very low carbon steel; Type A (C ≤0.10 %) allows ultra-low-carbon steel. DX51D allows more carbon (≤0.18 %) and manganese (≤1.20 %), and A653 mechanical ranges for CS are typical rather than mandatory. | ASTM A653/A653M | Closest equivalent |
| ASTM A653 coating designation | G90Coating, not a steel grade. G90 is 0.90 oz/ft² total on both sides (minimum triple-spot average), which is Z275 (275 g/m²) in SI units. | ASTM A653/A653M | Equivalent | |
| UK | BS EN 10346 | DX51D+ZThe UK adopts the European standard unchanged. | BS EN 10346 | Same material |
| EU | EN 10027-1 name | DX51D+ZD = hot-dip coated flat product for cold forming; +Z = zinc coating; the coating mass (Z275) and finish codes follow the name on an order. | EN 10346 | Same material |
| EN 10027-2 number | 1.0226Material number of DX51D. | EN 10346 | Same material | |
| EN 10027-1 name | DX51D+ZFSame base steel with a zinc-iron (galvannealed) coating, which suits painting and resistance welding. | EN 10346 | Equivalent | |
| EN 10346 coating designation | Z275Minimum 275 g/m² of zinc, total on both sides. | EN 10346 | Same material | |
| DIN 17162-1 / EN 10142 (legacy) | St 02 ZSuperseded names (EN 10142 listed it as Fe P02 G). Chemistry and test requirements changed between editions. | — | Equivalent | |
| India | IS 277:2018 | GP (Ordinary)Plain galvanized sheet with no mechanical requirement in the table. Use for general sheet work. | IS 277:2018 | Closest equivalent |
| IS 277:2018 | GPL (Drawing, lock forming)Lower carbon and manganese than DX51D, with yield ≤350 MPa, tensile ≤450 MPa and A80 ≥24 %. | IS 277:2018 | Closest equivalent | |
| IS 277 coating class | 275Class 275: minimum 275 g/m² total both sides, single-spot minimum 235 g/m². The standard recommends it for roofing on 0.63 mm base steel. | IS 277:2018 | Equivalent | |
| Japan | JIS G 3302 | SGCCCommercial quality. Carbon ≤0.15 %, manganese ≤0.80 %; yield and tensile values are for reference only. | JIS G 3302 | Closest equivalent |
| JIS G 3302 coating symbol | Z27Minimum 275 g/m² at triple spots, 234 g/m² at a single spot. | JIS G 3302 | Equivalent |
On equivalence
- None of the cross-region names is identical to DX51D. All are closest matches for commercial-quality galvanized sheet.
- ASTM A653 CS Type B is the usual American match. A653 CS mechanical ranges are typical rather than mandatory, while EN 10346 specifies a tensile range and a minimum A80. A653 quotes elongation over 50 mm (2 in) and EN 10346 over 80 mm (A80), so the elongation figures do not compare directly.
- IS 277:2018 uses its own grade names. GP is the ordinary grade with no mechanical limits; GPL (lock forming) is the nearest to DX51D in chemistry, but its limits are maxima for yield and tensile strength.
- JIS SGCC lists yield (205 MPa) and tensile (270 MPa) values for reference only, so it is a quality description rather than a guaranteed strength.
- Coating mass equivalence (minimum total both sides, triple-spot average): Z275 = G90 (A653) = class 275 (IS 277) = Z27 (JIS). Likewise Z200 = class 200 (IS 277) = Z20 (JIS); Z350 = class 350 = Z35 (JIS), with G115 as the A653 inch-pound counterpart; G60 = Z180 (A653) = class 180 (IS 277) = Z18 (JIS). EN 10346 has no Z180: use Z140 or Z200.
- The inch-pound to metric conversion is 1 oz/ft² = 305 g/m², so G90 is 274.5 g/m²; A653M states it as Z275 (International Zinc Association).
- Check the edition and the test method: single-spot minimums differ between standards (IS 277 class 275 is 235 g/m²; JIS Z27 is 234 g/m²).
- DIN St 02 Z and Fe P02 G are old names; Bucher Stahl and Applus datasheets list them against DX51D.
Chemical composition
Composition limits, mass %
| Element | CS Type B (heat analysis)USA · ASTM A653/A653M | CS Type A (heat analysis)USA · ASTM A653/A653M | DX51D+Z / +ZF (heat analysis)EU · EN 10346 | GPIndia · IS 277:2018 | GPLIndia · IS 277:2018 | SGCCJapan · JIS G 3302 |
|---|---|---|---|---|---|---|
| C | 0.02–0.15 | ≤0.10 | ≤0.18 | ≤0.25 | ≤0.12 | ≤0.15 |
| Si | — | — | ≤0.50 | — | — | — |
| Mn | ≤0.60 | ≤0.60 | ≤1.20 | ≤1.70 | ≤0.50 | ≤0.80 |
| P | ≤0.030 | ≤0.030 | ≤0.12 | ≤0.050 | ≤0.040 | ≤0.05 |
| S | ≤0.035 | ≤0.035 | ≤0.045 | ≤0.045 | ≤0.035 | ≤0.05 |
| N | — | — | — | ≤0.012 | ≤0.012 | — |
| Ti | — | — | ≤0.30 | — | — | — |
Mechanical properties
Strength and hardness
| Condition | Tensile strength | Yield strength | Elongation | Hardness |
|---|---|---|---|---|
| Hot-dip galvanized (DX51D+Z / +ZF)Specified. Yield not specified; the A80 minimum is for thickness over 0.7 mm, reduced by 2 units for 0.5–0.7 mm and by 4 units at 0.5 mm and belowEN 10346 as tabulated by Nippon Steel Slovakia and CSVC | 270–500 MPa39–73 ksi | — | ≥22 % | — |
| Galvanized (ASTM A653 CS Type B)Typical, non-mandatory range for the full thickness range; elongation in 50 mm (2 in); no tensile range establishedASTM A653 as tabulated by U. S. Steel and CSVC | — | 205–380 MPa30–55 ksi | ≥20 % | — |
| Galvanized (IS 277 GPL)Specified maxima; elongation Lo = 80 mm, minus 4 units at 0.5 mm and below, minus 2 units at 0.5–0.7 mm; GP has no mechanical requirementIS 277:2018, Table 2 | ≤450 MPa≤65 ksi | ≤350 MPa≤51 ksi | ≥24 % | — |
| Galvanized (JIS G 3302 SGCC)For reference only, not a guaranteed valueJIS G 3302 as tabulated by CSVC | ≥270 MPa≥39 ksi | ≥205 MPa≥30 ksi | — | — |
In practice
Behaviour, heat treatment and uses
Characteristics
- EN 10346 sets only a tensile range (270–500 MPa) and a minimum A80 of 22 % for DX51D. It sets no yield, r-value or n-value, so deep drawing is outside its intended use.
- Zinc protects the steel by acting as a barrier and by corroding in preference at scratches and cut edges.
- The grade is made with several coatings under EN 10346: zinc (+Z), zinc-iron (+ZF), and aluminium-based or zinc-aluminium coatings such as +AZ, +ZA and +AS.
- Carbon is capped at 0.18 %, so the base steel welds readily; weld through the coating only with fume extraction, because zinc vaporizes.
- Tighter forming grades follow in the same standard: DX52D, DX53D, DX54D and above add yield limits and, from DX54D, r and n values.
Heat treatment
- Supplied as coated, annealed strip or cut sheet; no further heat treatment is intended.
- Zinc melts at about 420 °C, so annealing, stress relieving or hot forming after coating will damage the zinc layer.
- Forming and bending are done cold.
Typical uses
- Roofing, wall cladding and rainwater goods
- Roll-formed profiles, purlins and framing sections (light gauge)
- Ducting and air-handling casings
- Cable trays, enclosures, racking and shelving
- General sheet-metal fabrication where deep drawing is not needed
Sheet and strip
Similar grades compared
| Grade | C % | Mn % | Cr % | Ni % | Tensile, first listed condition |
|---|---|---|---|---|---|
| DX51D / 1.0226 | 0.02–0.15 | ≤0.60 | — | — | 270–500 MPa |
| DX53D / 1.0355 | ≤0.06 | ≤0.50 | — | — | 270–380 MPa |
| S350GD / 1.0529 | ≤0.25 | ≤1.35 | — | — | ≥420 MPa |
| DD11 / SPHC | ≤0.15 | ≤0.60 | ≤0.15 | ≤0.20 | ≤440 MPa |
| DD12 / SPHD | 0.02–0.08 | ≤0.45 | — | — | ≤420 MPa |
| DD13 / SPHE | ≤0.08 | ≤0.40 | — | — | ≤400 MPa |
| S355MC | ≤0.23 | ≤1.35 | ≤0.15 | ≤0.20 | 430–550 MPa |
| DC01 / SPCC | 0.02–0.15 | ≤0.60 | ≤0.15 | ≤0.20 | 270–410 MPa |
| DC03 / SPCD | 0.02–0.08 | ≤0.50 | ≤0.15 | ≤0.20 | 270–370 MPa |
| DC04 / SPCE | ≤0.06 | ≤0.50 | ≤0.15 | ≤0.20 | 270–350 MPa |
Composition from the US standard where one exists, otherwise the first standard listed on each grade's page. Strength conditions differ between grades; open a grade for its full table.
Questions answered
Common questions
What does DX51D+Z275 mean?
DX51D is the EN 10346 grade name: D marks a hot-dip coated flat product for cold forming and 51 is the quality number (1.0226). +Z275 is the coating: zinc at a minimum of 275 g/m² in total on both sides. Orders often add a spangle code (N normal, M minimized) and a surface quality (A, B or C).
What is the equivalent of DX51D in ASTM?
ASTM A653/A653M CS Type B is the closest. CS Type A is also used. The match is not exact: DX51D permits carbon up to 0.18 % and manganese up to 1.20 %, and A653 gives only typical, non-mandatory mechanical ranges for CS.
Is Z275 the same as G90?
They describe the same minimum zinc mass: G90 is 0.90 oz/ft² and Z275 is 275 g/m², each total on both sides. The International Zinc Association gives G90 = Z275 as the standard conversion. Their steel grades and test rules still differ, so order both the base grade and the coating.
What is the Indian equivalent of DX51D?
Within IS 277:2018 the closest are GP (ordinary) and GPL (drawing, lock forming), with coating class 275 for a Z275 equivalent. The Indian grade names are GP-based, not DX-based, and GP has no mechanical limits in the table.
What is the difference between DX51D and DX53D?
DX53D is a deep-drawing grade with lower carbon (≤0.12 %), a yield range of 140–260 MPa, tensile strength 270–380 MPa and at least 30 % A80. DX51D has no yield limit, a wider 270–500 MPa tensile range and 22 % A80, and is meant for bending and profiling.
From the Corona catalog
Products listed with DX51D / 1.0226
C Purlin
Height (H): 3-14 in / 75-300 mm · Flange (B): 2.35-3 in / 60-75 mm
Specifications
Z Purlin
Height (H): 4-14 in / 100-350 mm · Flange (B): 2.75-3 in / 60-90 mm
Specifications
Ground Mountings
Components: Cold Formed Sections & Fabrication: posts, rafters, purlins, bracing, base plates · Posts: Round tube 60, 75, 89, 114 mm; C and sigma sections to design
Specifications
C Purlin
Height (H): 3-10 in / 75-250 mm · Flange (B): 2.35 in / 60 mm
Specifications
Z Purlin
Height (H): 4-10 in / 100-250 mm · Flange (B): 2.75 in / 70 mm
SpecificationsKeep reading
Related references
References
Sources
- Nippon Steel Slovakia: EN 10346 drawing steels (DX51D to DX57D) — Composition (heat analysis) and mechanical properties of DX51D, DX52D, DX53D.
- China Steel and Nippon Steel Vietnam: hot-dip zinc-coated steel coils product manual — JIS G 3302, ASTM A653 and EN 10346 tables side by side, including coating masses.
- Nippon Steel Slovakia: hot-dip galvanized range, coating masses — Z100 to Z350 minimum zinc mass, total both sides, average of three samples.
- IS 277:2018 Galvanized steel strips and sheets, plain and corrugated (public copy) — Grade chemistry, mechanical properties and coating classes (Tables 1 to 4).
- U. S. Steel Technical Bulletin TSB 4.1: ASTM designations for steel properties of hot-dip galvanized and Galvalume sheet — A653 chemistry and mechanical tables as of the 2004 edition; CS, FS, DDS, SS grades.
- International Zinc Association: GalvInfoNote 1.1, coating weight designations for zinc-based coatings on steel sheet — G and Z designations, conversion of oz/ft² to g/m², triple-spot test.
- BSI: BS EN 10346 Continuously hot-dip coated steel flat products, technical delivery conditions — Scope and title of the standard; the figures below come from the mill datasheets.
- ASTM A653/A653M Steel sheet, zinc-coated (galvanized) or zinc-iron alloy-coated (galvannealed) by the hot-dip process — Standard record; mechanical and chemical figures taken from the U. S. Steel and CSVC summaries.
- JIS G 3302 Hot-dip zinc-coated steel sheets and coils (2019 edition, preview) — Preview pages only; grade values are taken from the CSVC product manual.
- Bucher Stahl: sheet steel grade table (DX51D to DX54D with old DIN names) — Stockist table giving St 02 Z and St 05 Z against DX51D and DX53D.
Values summarize published limits and typical data. The governing standard and the current edition control; check them before specifying.