Steel DX51D S250GD
Grade
EN DX51D
S250GD = s250GD+Z
Order this instead of DX51D when a guaranteed minimum yield (250 MPa) is needed for load-bearing purlins, studs and decking.
Values for the S250GD condition
Other DX51D tempers and conditions
DX51D is listed in 3 conditions; see the grade overview at DX51D.
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 |
S250GDThis page 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 |
What is DX51D S250GD?
DX51D S250GD is DX51D in the S250GD grade — order this instead of DX51D when a guaranteed minimum yield (250 MPa) is needed for load-bearing purlins, studs and decking. DX51D S250GD has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 88% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi). DX51D S250GD 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). HR is the default condition FabDigit quotes; S250GD is available on request or by drawing note.
Advantages
- High electrical conductivity — 11 % IACS, better than 98% of steel grades
- Good corrosion resistance — 35/100, better than 97% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Conducts heat well — 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades
Limitations
- Hard to polish — 35/100, worse than 99% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Low strength — 290 MPa (42.1 ksi), worse than 88% of steel grades
- High embodied carbon — 2.5 kg CO₂/kg, worse than 82% of steel grades
DX51D S250GD properties
Typical room-temperature values for DX51D S250GD; 20 are specific to this condition. Other listed values are DX51D reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
DX51D S250GD 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 S250GD has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 88% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
DX51D S250GD is rated for continuous service to 200°C (392 °F). It conducts heat at 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
DX51D S250GD conducts electricity at 11 % IACS, better than 98% of steel grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), better than 97% of steel grades.
Sustainability4
Producing a kilogram of DX51D S250GD 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 S250GD's machinability is good (60/100, better than 83% of steel grades); weldability very good (70/100); formability good (58/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with DX51D S250GD
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.
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.
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 | — |
DX51D S250GD — frequently asked
What is DX51D S250GD used for?
DX51D S250GD 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 S250GD?
DX51D S250GD has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 88% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is DX51D S250GD easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% 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 S250GD be welded?
Yes — weldability is rated very good (70/100). 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 S250GD?
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 S250GD 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 S250GD?
DX51D S250GD is rated for continuous use to about 200°C (392 °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.
Can FabDigit make parts in DX51D S250GD?
Yes — DX51D S250GD 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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.