Steel DX51D
EN DX51D
DX51D is the base cold-forming grade of EN 10346 for continuously hot-dip metallic-coated low-carbon steel strip, supplied almost exclusively as coated coil/sheet (+Z galvanized, +ZF galvannealed, +ZA Galfan, +AZ Aluzinc, +AS aluminized).
Values for the HR condition
DX51D tempers and conditions
DX51D is supplied in 3 conditions, soft to hard. HR is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HRDefault Hot rolled | Uncoated hot-rolled/pickled substrate strip, typically 1.5 mm and thicker, before the galvanizing line or where coating is added later. | 240 | 340 | 32 | 110 HB | 12 % IACS |
Cold rolled | Uncoated cold-rolled substrate for thin gauges (0.3–2 mm) and for feeding the hot-dip line; brighter surface, tighter thickness tolerance. | 270 | 360 | 30 | 120 HB | 12 % IACS |
S250GD+Z | Order this instead of DX51D when a guaranteed minimum yield (250 MPa) is needed for load-bearing purlins, studs and decking. | 290 | 360 | 22 | 120 HB | 11 % IACS |
Supply forms, finishes and certifications
Ways DX51D is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
ZA | DX51D+ZA | Surface finish |
ZF | DX51D+ZF | Surface finish |
AS | DX51D+AS | Coating |
AZ | DX51D+AZ | Coating |
Galvanized | DX51D+Z | Coating |
What is DX51D?
DX51D is the base cold-forming grade of EN 10346 for continuously hot-dip metallic-coated low-carbon steel strip, supplied almost exclusively as coated coil/sheet (+Z galvanized, +ZF galvannealed, +ZA Galfan, +AZ Aluzinc, +AS aluminized). It is chosen for cheap, weldable, paint- or coat-ready sheet with sacrificial zinc protection for ducting, profiles, roofing, cable trays, enclosures and general fabrication. Limits: only bending/simple-forming quality (deeper draws need DX52D–DX56D), no specified yield strength or impact toughness, zinc coating restricts service to roughly 200 °C and complicates welding and post-forming scratch resistance. DX51D has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F). DX51D has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 96% of steel grades. Elongation at break is 32% and the elastic modulus is 205 GPa (29.7 Msi).
What is DX51D used for?
- Roof decking
- Industrial siding and wall cladding
- HVAC ducting and plenum sections
- Roll-formed structural profiles
- Cable trays and trunking
- Electrical and control enclosures
- General fabricated brackets and panels
Advantages
- High electrical conductivity — 12 % IACS, better than 99% of steel grades
- Conducts heat well — 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades
- Ductile — tolerates forming and impact — 32%, better than 95% of steel grades
- Easy to machine — 65/100, better than 93% of steel grades
- Readily welded — 92/100, better than 93% of steel grades
Limitations
- Hard to polish — 35/100, worse than 99% of steel grades
- Low strength — 240 MPa (34.8 ksi), worse than 96% of steel grades
- High embodied carbon — 2.5 kg CO₂/kg, worse than 82% of steel grades
DX51D properties
Typical room-temperature values for DX51D-HR; bars are the position among steel grades.
Physical3
DX51D has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F).
Mechanical15
DX51D has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 96% of steel grades. Elongation at break is 32% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
DX51D is rated for continuous service to 400°C (752 °F). It conducts heat at 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
DX51D conducts electricity at 12 % IACS, better than 99% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of DX51D takes about 26 MJ of energy and emits 2.5 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 25%.
Manufacturability7
DX51D's machinability is good (65/100, better than 93% of steel grades); weldability excellent (92/100); formability good (68/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. DX51D is highlighted; hover a dot for its name, or open the interactive family chart.
Working with DX51D
Is DX51D easy to machine?
Very easy but gummy; use sharp tools, generous rake and clean punch/die clearance (~6–8 % of thickness) to avoid burrs and zinc pickup — laser and plasma cutting need edge touch-up.
Can DX51D be welded?
Base steel is fully weldable (RSW, MAG, laser); increase current/electrode force for spot welding, expect zinc porosity and spatter in MAG, provide fume extraction and re-protect cut/weld zones with zinc-rich paint.
Can DX51D be formed, bent or molded?
Suited to bending, roll forming, profiling and shallow stampings only (no yield/r-value guarantee); for deep drawing step up to DX52D–DX56D, and use minimum bend radius ≈1×t for +Z, larger for +ZF/+AZ coatings.
Manufacturability
The process limits FabDigit applies to DX51D. Every DX51D part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
Sheet metal
| Formability | Excellent68 / 100 |
|---|---|
| Weldability | Fair92 / 100 |
| Bendable | Yes |
| Minimum bend radius | 1× thickness |
| Sheet thickness range | 0.5 – 3 mm |
| Spring-back | Moderate |
DX51D chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CEN 10346 max for DX51D | ≤ 0.18 | 0.06 |
| Si | ≤ 0.5 | 0.03 |
| Mn | ≤ 1.2 | 0.35 |
| P | ≤ 0.12 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Tiwhen Ti-stabilised | ≤ 0.3 | 0.01 |
| Fe | balance |
What surface finishes work on DX51D?
Chromate/chromium-free passivated or oiled as delivered; degrease and use etch/wash primer or phosphate before powder coating, or specify PPGI prepainted coil; not anodizable.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel DX51D in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- SGHC
How much does DX51D cost?
DX51D is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
DX51D — frequently asked
What is DX51D used for?
DX51D is typically used for roof decking, industrial siding and wall cladding, HVAC ducting and plenum sections, roll-formed structural profiles, cable trays and trunking and electrical and control enclosures. In short: galvanized forming coil.
What is the yield strength of DX51D?
DX51D has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 96% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is DX51D easy to machine?
Reasonably — machinability is rated good (65/100, better than 93% of steel grades). Very easy but gummy; use sharp tools, generous rake and clean punch/die clearance (~6–8 % of thickness) to avoid burrs and zinc pickup — laser and plasma cutting need edge touch-up.
Can DX51D be welded?
Yes — weldability is rated excellent (92/100). Base steel is fully weldable (RSW, MAG, laser); increase current/electrode force for spot welding, expect zinc porosity and spatter in MAG, provide fume extraction and re-protect cut/weld zones with zinc-rich paint.
What surface finishes work on DX51D?
Chromate/chromium-free passivated or oiled as delivered; degrease and use etch/wash primer or phosphate before powder coating, or specify PPGI prepainted coil; not anodizable.
Can DX51D be formed, bent or molded?
Suited to bending, roll forming, profiling and shallow stampings only (no yield/r-value guarantee); for deep drawing step up to DX52D–DX56D, and use minimum bend radius ≈1×t for +Z, larger for +ZF/+AZ coatings.
What is the maximum service temperature of DX51D?
DX51D is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between DX51D-HR and DX51D S250GD?
HR is the default condition — uncoated hot-rolled/pickled substrate strip, typically 1.5 mm and thicker, before the galvanizing line or where coating is added later. S250GD: order this instead of DX51D when a guaranteed minimum yield (250 MPa) is needed for load-bearing purlins, studs and decking. Yield strength is 240 MPa in HR versus 290 MPa in S250GD.
How much does DX51D cost?
DX51D is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in DX51D?
Yes — DX51D is available for sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- EN 10346 — Continuously hot-dip coated steel flat products for cold forming — CEN (2015)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Hot-dip galvanized / Aluzinc coated steel grade datasheets (ArcelorMittal, Baosteel, voestalpine) — producers (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.