Steel DP1180 +ZF
Finish state
+ZF = galvannealed (GA), HCT1180X+ZF
Zn-Fe alloy coating preferred where paint adhesion and spot-weld electrode life matter more than coating ductility.
Values for the +ZF condition
Other DP1180 tempers and conditions
DP1180 is listed in 5 conditions; see the grade overview at DP1180.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot-dip galvanized (GI), HCT1180X+Z | Choose for corrosion-exposed body-in-white members needing cathodic protection; watch liquid-metal-embrittlement limits in spot welding. | 930 | 1,220 | 7 | 38 HRC | 8 % IACS |
+ZFThis page Galvannealed (GA), HCT1180X+ZF | Zn-Fe alloy coating preferred where paint adhesion and spot-weld electrode life matter more than coating ductility. | 940 | 1,220 | 6.5 | 38 HRC | 8 % IACS |
CRDefault Cold rolled | Standard uncoated cold-rolled DP1180 coil/blank for interior structural parts that are e-coated after assembly. | 950 | 1,230 | 7 | 38 HRC | 8 % IACS |
Electrogalvanized | Thin, uniform electroplated zinc for tight-tolerance stampings and good surface quality; requires hydrogen-relief baking at this strength level. | 950 | 1,230 | 7 | 38 HRC | 8 % IACS |
After paint-bake | Use for as-installed part strength in crash simulation: forming plus paint-bake raises the yield strength appreciably. | 1,080 | 1,250 | 5 | 39 HRC | 8 % IACS |
What is DP1180 +ZF?
DP1180 +ZF is DP1180 supplied in the +ZF condition — zn-Fe alloy coating preferred where paint adhesion and spot-weld electrode life matter more than coating ductility. DP1180 +ZF has a yield strength of 940 MPa (136 ksi) and a tensile strength of 1,220 MPa (177 ksi) — stronger than 91% of steel grades. Elongation at break is 6.5% and the elastic modulus is 205 GPa (29.7 Msi). DP1180 +ZF has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). CR is the default condition FabDigit quotes; +ZF is available on request or by drawing note.
Advantages
- Good corrosion resistance — 42/100, better than 98% of steel grades
- High strength — 940 MPa (136 ksi), better than 91% of steel grades
Limitations
- Limited ductility — 6.5%, worse than 97% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Difficult to machine — 27/100, worse than 92% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 82% of steel grades
DP1180 +ZF properties
Typical room-temperature values for DP1180 +ZF; 22 are specific to this condition. Other listed values are DP1180 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
DP1180 +ZF has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical15
DP1180 +ZF has a yield strength of 940 MPa (136 ksi) and a tensile strength of 1,220 MPa (177 ksi) — stronger than 91% of steel grades. Elongation at break is 6.5% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
DP1180 +ZF is rated for continuous service to 200°C (392 °F). It conducts heat at 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
DP1180 +ZF conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), better than 98% of steel grades.
Sustainability4
Producing a kilogram of DP1180 +ZF takes about 30 MJ of energy and emits 2.4 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability7
DP1180 +ZF's machinability is poor (27/100, worse than 92% of steel grades); weldability good (62/100); formability poor (23/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with DP1180 +ZF
Is DP1180 easy to machine?
Rarely machined — blank by laser or carbide/PM tooling with large clearance; expect fast punch wear and prefer laser or waterjet cutting of hardened edges.
Can DP1180 be welded?
Good resistance spot weldability with in-process pulsing/post-heat to improve nugget toughness; on Zn-coated grades control heat input and electrode force to avoid liquid metal embrittlement, and avoid oxy-fuel/soft filler arc welds that soften the HAZ.
Can DP1180 be formed, bent or molded?
Cold stamping only with high-tonnage presses, generous bend radii (≥3–4 t), stretch-flange-safe trimmed edges (laser trim preferred) and springback compensation in the die face; hole expansion is limited.
What surface finishes work on DP1180?
Zinc coating (GI/GA/EG) plus phosphate and cataphoretic e-coat is the standard system; avoid acid pickling or electroplating without baking due to delayed-fracture/hydrogen risk.
DP1180 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 10338 HCT1180X ladle max; producers typically 0.13–0.19 | ≤ 0.23 | 0.16 |
| Si | ≤ 1 | 0.3 |
| Mn | ≤ 3 | 2.3 |
| P | ≤ 0.08 | 0.01 |
| S | ≤ 0.02 | 0 |
| Altotal Al | 0.02 – 2 | 0.04 |
| Cr+Mohardenability additions | ≤ 1.4 | 0.4 |
| Nb+Tigrain refinement / precipitation | ≤ 0.15 | 0.04 |
| V | ≤ 0.2 | — |
| B | ≤ 0.01 | 0 |
| Fe | balance | — |
DP1180 +ZF — frequently asked
What is DP1180 +ZF used for?
DP1180 +ZF is typically used for door rings, B-pillar reinforcements, bumper beams and sill reinforcements. In short: highest-strength cold-formable DP; crash-critical BIW grade; only 7 % elongation.
What is the yield strength of DP1180 +ZF?
DP1180 +ZF has a typical yield strength of 940 MPa (136 ksi) and a tensile strength of 1,220 MPa (177 ksi) — stronger than 91% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is DP1180 +ZF easy to machine?
Not especially — machinability is rated poor (27/100, worse than 92% of steel grades). Rarely machined — blank by laser or carbide/PM tooling with large clearance; expect fast punch wear and prefer laser or waterjet cutting of hardened edges.
Can DP1180 +ZF be welded?
Yes — weldability is rated good (62/100). Good resistance spot weldability with in-process pulsing/post-heat to improve nugget toughness; on Zn-coated grades control heat input and electrode force to avoid liquid metal embrittlement, and avoid oxy-fuel/soft filler arc welds that soften the HAZ.
What surface finishes work on DP1180 +ZF?
Zinc coating (GI/GA/EG) plus phosphate and cataphoretic e-coat is the standard system; avoid acid pickling or electroplating without baking due to delayed-fracture/hydrogen risk.
Can DP1180 +ZF be formed, bent or molded?
Cold stamping only with high-tonnage presses, generous bend radii (≥3–4 t), stretch-flange-safe trimmed edges (laser trim preferred) and springback compensation in the die face; hole expansion is limited.
What is the maximum service temperature of DP1180 +ZF?
DP1180 +ZF 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 DP1180-CR and DP1180-BH?
CR is the default condition — standard uncoated cold-rolled DP1180 coil/blank for interior structural parts that are e-coated after assembly. BH: use for as-installed part strength in crash simulation: forming plus paint-bake raises the yield strength appreciably. Yield strength is 950 MPa in CR versus 1,080 MPa in BH.
Sources
- EN 10338 — Hot rolled and cold rolled uncoated products of multiphase steels for cold forming — CEN (2015)
- EN 10346 — Continuously hot-dip coated steel flat products (HCT1180X+Z/+ZF) — CEN (2015)
- VDA 239-100 — Sheet steel for cold forming (dual-phase grades) — VDA (2016)
- Advanced High-Strength Steels Application Guidelines V7 — WorldAutoSteel (2021)
- Dual phase steel DP1180 cold-rolled / galvanized coil datasheets — Baosteel / ArcelorMittal / 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.