Steel DX51D · supply condition
Steel DX51D-CR
Properties of the CR condition, compared with the other DX51D tempers.
Uncoated cold-rolled substrate for thin gauges (0.3–2 mm) and for feeding the hot-dip line; brighter surface, tighter thickness tolerance.
What is DX51D-CR?
DX51D-CR is DX51D supplied in the CR condition — uncoated cold-rolled substrate for thin gauges (0.3–2 mm) and for feeding the hot-dip line; brighter surface, tighter thickness tolerance. DX51D-CR has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 91% of steel grades. Elongation at break is 30% and the elastic modulus is 205 GPa (29.7 Msi). DX51D-CR 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; CR is available on request or by drawing note.
Advantages
- High electrical conductivity — 11 % IACS, better than 98% of steel grades
- Readily welded — 92/100, better than 93% of steel grades
- Ductile — tolerates forming and impact — 30%, better than 92% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
- Conducts heat well — 50 W/m·K (28.9 BTU/hr·ft·°F), better than 88% of steel grades
Limitations
- Low strength — 270 MPa (39.2 ksi), worse than 91% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- High embodied carbon — 2.5 kg CO₂/kg, worse than 82% of steel grades
DX51D-CR properties
Typical room-temperature values for DX51D-CR — 9 properties are specific to this condition; the rest are grade-level values shared by every DX51D temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
DX51D-CR 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).
Mechanical11
DX51D-CR has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 91% of steel grades. Elongation at break is 30% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
DX51D-CR is rated for continuous service to 400°C (752 °F). It conducts heat at 50 W/m·K (28.9 BTU/hr·ft·°F), better than 88% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
DX51D-CR conducts electricity at 11 % IACS, better than 98% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 87% of steel grades.
Sustainability4
Producing a kilogram of DX51D-CR 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-CR's machinability is good (62/100, better than 89% of steel grades); weldability excellent (92/100); formability very good (72/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other DX51D tempers and conditions
DX51D is also supplied in 7 other conditions. The full side-by-side table is on the DX51D overview.
- HRDefaultUncoated hot-rolled/pickled substrate strip, typically 1.5 mm and thicker, before the galvanizing line or where coating is added later.240 MPa yield · 110 HB
- GalvanizedDefault commercial condition: general-purpose galvanized coil/sheet for bending, roll forming, ducting and enclosures.280 MPa yield · 115 HB
- CRUncoated cold-rolled substrate for thin gauges (0.3–2 mm) and for feeding the hot-dip line; brighter surface, tighter thickness tolerance.270 MPa yield · 120 HB
Working with DX51D-CR
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-CR — frequently asked
What is DX51D-CR used for?
DX51D-CR 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-CR?
DX51D-CR has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 91% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is DX51D-CR easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% 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-CR 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-CR?
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-CR 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-CR?
DX51D-CR 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-AZ?
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. AZ: best choice for roofing, cladding and appliance panels: 2–4× the atmospheric life of equivalent zinc weight plus heat reflectance up to ~315 °C. Yield strength is 240 MPa in HR versus 290 MPa in AZ.
Can FabDigit make parts in DX51D-CR?
Yes — DX51D-CR is available for sheet metal with instant online pricing. 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.