Steel DX56D +Z
Finish state · default condition
EN DX56D
+Z = hot-dip zinc coated (Z100–Z275), skin-passed, chemically…
Default automotive/appliance choice: best combination of deep drawability and sacrificial corrosion protection.
Values for the +Z condition
Other DX56D tempers and conditions
DX56D is listed in 4 conditions; see the grade overview at DX56D.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+ZDefaultThis page Hot-dip zinc coated (Z100–Z275), skin-passed, chemically… | Default automotive/appliance choice: best combination of deep drawability and sacrificial corrosion protection. | 150 | 300 | 42 | 85 HB | 11 % IACS |
Hot-dip Zn-5%Al (Galfan) coating | Choose for tighter bends and better cut-edge/atmospheric corrosion life than plain +Z at equal coating mass. | 150 | 300 | 42 | 85 HB | 11 % IACS |
Galvannealed zinc-iron alloy coating | Pick when the part is painted/e-coated and spot-welded in high volume — matte Fe-Zn layer gives superior paint adhesion and electrode life. | 155 | 305 | 40 | 90 HB | 11 % IACS |
Hot-dip 55%Al-Zn (Aluzinc/Galvalume) coating | Use where long atmospheric life and heat reflectivity matter more than cut-edge sacrificial protection. | 155 | 305 | 40 | 88 HB | 11 % IACS |
What is DX56D +Z?
DX56D +Z is DX56D supplied in the +Z condition — default automotive/appliance choice: best combination of deep drawability and sacrificial corrosion protection. DX56D +Z has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 100% of steel grades. Elongation at break is 42% and the elastic modulus is 210 GPa (30.5 Msi). DX56D +Z has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F).
Advantages
- Ductile — tolerates forming and impact — 42%, better than 100% of steel grades
- Forms and bends easily — 98/100, better than 100% of steel grades
- Conducts heat well — 55 W/m·K (31.8 BTU/hr·ft·°F), better than 99% of steel grades
- High electrical conductivity — 11 % IACS, better than 98% of steel grades
- Good corrosion resistance — 45/100, better than 98% of steel grades
Limitations
- Low strength — 150 MPa (21.8 ksi), worse than 100% of steel grades
- Hard to polish — 40/100, worse than 96% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
DX56D +Z properties
Typical room-temperature values for DX56D +Z; 20 are specific to this condition. Other listed values are DX56D reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
DX56D +Z has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F).
Mechanical14
DX56D +Z has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 100% of steel grades. Elongation at break is 42% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
DX56D +Z is rated for continuous service to 200°C (392 °F). It conducts heat at 55 W/m·K (31.8 BTU/hr·ft·°F), better than 99% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
DX56D +Z conducts electricity at 11 % IACS, better than 98% of steel grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), better than 98% of steel grades.
Sustainability4
Producing a kilogram of DX56D +Z takes about 28 MJ of energy and emits 2.4 kg of CO₂ — less than 56% of steel grades. Typical recycled content is 20%.
Manufacturability6
DX56D +Z's machinability is fair (45/100, worse than 65% of steel grades); weldability excellent (88/100); formability excellent (98/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with DX56D +Z
Is DX56D easy to machine?
Rarely machined; ultra-low-carbon sheet is gummy — use sharp, high-rake tools, positive shear-angle blanking dies and keep die clearance ~6–8% of thickness to limit burr.
Can DX56D be welded?
Excellent for resistance spot/seam welding with increased current and electrode force to cope with the zinc layer; MIG-brazing with CuSi3 minimises coating burn-off, and fume extraction is required.
Can DX56D be formed, bent or molded?
Designed for severe deep drawing/stretch forming (r90≥1.9, n90≥0.21) with minimal springback; avoid over-aging by using within the mill's non-ageing shelf life and keep drawbead pressure moderate to prevent coating powdering.
What surface finishes work on DX56D?
Take as-coated with passivation/oil, or phosphate + e-coat/powder paint (+ZF gives the best paint key); never anodize — repair cut edges and welds with zinc-rich primer.
DX56D 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 |
|---|---|---|
| Cultra-low carbon (IF steel) | ≤ 0.02 | 0.01 |
| Mn | ≤ 0.25 | 0.15 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Tiinterstitial stabilisation (Nb may substitute in part) | ≤ 0.3 | 0.06 |
| Fe | balance | — |
DX56D +Z — frequently asked
What is DX56D +Z used for?
DX56D +Z is typically used for automotive body panels, severe stampings and corrosion-resistant parts. In short: best-forming coated sheet; extra-deep-drawing quality; coating-based corrosion protection.
What is the yield strength of DX56D +Z?
DX56D +Z has a typical yield strength of 150 MPa (21.8 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 100% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is DX56D +Z easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Rarely machined; ultra-low-carbon sheet is gummy — use sharp, high-rake tools, positive shear-angle blanking dies and keep die clearance ~6–8% of thickness to limit burr.
Can DX56D +Z be welded?
Yes — weldability is rated excellent (88/100). Excellent for resistance spot/seam welding with increased current and electrode force to cope with the zinc layer; MIG-brazing with CuSi3 minimises coating burn-off, and fume extraction is required.
What surface finishes work on DX56D +Z?
Take as-coated with passivation/oil, or phosphate + e-coat/powder paint (+ZF gives the best paint key); never anodize — repair cut edges and welds with zinc-rich primer.
Can DX56D +Z be formed, bent or molded?
Designed for severe deep drawing/stretch forming (r90≥1.9, n90≥0.21) with minimal springback; avoid over-aging by using within the mill's non-ageing shelf life and keep drawbead pressure moderate to prevent coating powdering.
What is the maximum service temperature of DX56D +Z?
DX56D +Z 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.
Sources
- EN 10346 — Continuously hot-dip coated steel flat products for cold forming — CEN (2015)
- EN 10143 — Continuously hot-dip coated steel sheet and strip: tolerances — CEN (2006)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (zinc coatings) — ASM International (2005)
- Hot-dip galvanized IF/EDDQ steel grades DX51D–DX57D datasheets — European flat-steel producers (ArcelorMittal / thyssenkrupp / voestalpine) (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.