Steel DP450
DP450 (HCT450X) is the entry-level dual-phase sheet steel, built from a soft ferrite matrix with hard martensite islands to give a low yield ratio and good stretch-flangeability.
Reference datasheet — DP450 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the CR condition
DP450 tempers and conditions
DP450 is supplied in 7 conditions, soft to hard. CR is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
CRDefault Cold rolled | Standard uncoated cold-rolled continuously annealed coil/sheet; pick when the part is painted, e-coated or hot-dip coated after forming. | 300 | 500 | 29 | 143 HB | 9.1 % IACS |
Electrogalvanised | Thin, very uniform electrolytic zinc on a base steel whose mechanicals stay identical to CR; used for close-tolerance visible parts. | 300 | 500 | 29 | 145 HB | 9 % IACS |
Hot-dip galvanised (GI), DP450 HCT450X+Z | Most common automotive supply form; choose for exposed or wet-side structural panels needing sacrificial zinc protection. | 310 | 500 | 28 | 146 HB | 9 % IACS |
Galvannealed | Zn-Fe alloyed coating for best paint adhesion and welding-electrode life; slightly more powdering in severe draws. | 310 | 500 | 27 | 146 HB | 9 % IACS |
Hot-dip Zn-Al-Mg coated | Zn-Al-Mg coating giving 2–5× the bare-edge and cut-edge corrosion life of GI at equal coating mass; for chassis and underbody panels. | 310 | 500 | 28 | 146 HB | 9 % IACS |
Hot rolled | Hot-rolled DP450 for thicker chassis/wheel/suspension parts where cold-rolled gauges are too thin; slightly lower elongation and rougher surface. | 330 | 490 | 26 | 148 HB | 9.1 % IACS |
2 % prestrain + paint bake | In-service condition of a formed and painted panel — quote these numbers for dent resistance and structural sizing, not the as-delivered values. | 370 | 515 | 24 | 152 HB | 9 % IACS |
What is DP450?
DP450 (HCT450X) is the entry-level dual-phase sheet steel, built from a soft ferrite matrix with hard martensite islands to give a low yield ratio and good stretch-flangeability. Typical values are 300 MPa yield, 500 MPa tensile and 29 % elongation at about 80 HRB, with coil available cold-rolled, hot-rolled, in 2PS+BH temper and with +Z, +ZF, +ZE or +ZM coatings for lightly loaded structural panels. Bare sheet has no inherent corrosion resistance and springback is roughly twice that of mild steel; DP600 is the next step when higher crash strength is needed. DP450 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,480°C (2,696 °F). DP450 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 86% of steel grades. Elongation at break is 29% and the elastic modulus is 210 GPa (30.5 Msi).
What is DP450 used for?
- door inner panels
- brackets
- reinforcements
- seat structures
Advantages
- Ductile — tolerates forming and impact — 29%, better than 91% of steel grades
- Forms and bends easily — 75/100, better than 90% of steel grades
- Readily welded — 82/100, better than 81% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Low strength — 300 MPa (43.5 ksi), worse than 86% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
DP450 properties
Typical room-temperature values for DP450-CR; bars are the position among steel grades.
Physical3
DP450 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,480°C (2,696 °F).
Mechanical12
DP450 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 86% of steel grades. Elongation at break is 29% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
DP450 is rated for continuous service to 200°C (392 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
DP450 conducts electricity at 9.1 % IACS, better than 73% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of DP450 takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability7
DP450's machinability is good (55/100, better than 62% of steel grades); weldability very good (82/100); formability very good (75/100).
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. DP450 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with DP450
Is DP450 easy to machine?
Rarely machined as sheet; drilling/trimming needs sharp carbide and rigid clamping — expect higher blanking loads (~1.3× mild steel) and faster die wear.
Can DP450 be welded?
Excellent resistance spot weldability at low carbon equivalent (CEV ≈ 0.25); MIG/laser welding fine with matching or ER70S-class wire, no preheat, keep heat input moderate to limit HAZ softening of martensite.
Can DP450 be formed, bent or molded?
Deep-drawable with n≈0.18 and A80≈29 %, but allow ~2× mild-steel springback compensation, use generous die radii and clean-sheared or laser-trimmed edges to avoid stretch-flange edge cracks.
DP450 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 HCT450X limit | ≤ 0.11 | 0.07 |
| Si | ≤ 0.5 | 0.25 |
| Mn | ≤ 1.6 | 1.2 |
| P | ≤ 0.08 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Altotal Al | 0.02 – 1 | 0.04 |
| Cr+Mohardenability addition | ≤ 1 | 0.2 |
| Nb+Timicroalloying | ≤ 0.15 | 0.03 |
| B | ≤ 0.01 | 5×10⁻⁴ |
| Fe | balance |
What surface finishes work on DP450?
Not anodizable; standard route is zinc coating (GI/GA/EG/ZM) or phosphate + cathodic e-coat and paint; bare CR coil must be oiled and used quickly.
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).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel DP450 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- HCT450X
How much does DP450 cost?
DP450 is a budget-cost steel ($), cheaper than about 90% 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.
DP450 — frequently asked
What is DP450 used for?
DP450 is typically used for door inner panels, brackets, reinforcements and seat structures. In short: most formable dual-phase grade; best-welding DP steel; low yield ratio, bake-hardenable.
What is the yield strength of DP450?
DP450 has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 86% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is DP450 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Rarely machined as sheet; drilling/trimming needs sharp carbide and rigid clamping — expect higher blanking loads (~1.3× mild steel) and faster die wear.
Can DP450 be welded?
Yes — weldability is rated very good (82/100). Excellent resistance spot weldability at low carbon equivalent (CEV ≈ 0.25); MIG/laser welding fine with matching or ER70S-class wire, no preheat, keep heat input moderate to limit HAZ softening of martensite.
What surface finishes work on DP450?
Not anodizable; standard route is zinc coating (GI/GA/EG/ZM) or phosphate + cathodic e-coat and paint; bare CR coil must be oiled and used quickly.
Can DP450 be formed, bent or molded?
Deep-drawable with n≈0.18 and A80≈29 %, but allow ~2× mild-steel springback compensation, use generous die radii and clean-sheared or laser-trimmed edges to avoid stretch-flange edge cracks.
What is the maximum service temperature of DP450?
DP450 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 DP450-CR and DP450-HR?
CR is the default condition — standard uncoated cold-rolled continuously annealed coil/sheet; pick when the part is painted, e-coated or hot-dip coated after forming. HR: hot-rolled DP450 for thicker chassis/wheel/suspension parts where cold-rolled gauges are too thin; slightly lower elongation and rougher surface. Yield strength is 300 MPa in CR versus 330 MPa in HR.
How much does DP450 cost?
DP450 is a budget-cost steel ($), cheaper than about 90% 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.
Sources
- EN 10346 — Continuously hot-dip coated steel flat products (HCT450X) — CEN (2015)
- VDA 239-100 — Sheet Steel for Cold Forming (CR450Y780T-class series and DP grades) — VDA (2016)
- GB/T 20564.2 — Cold rolled high strength steel sheet for automobile, Part 2: Dual phase steel — SAC (2017)
- Advanced High-Strength Steels Application Guidelines v7 — WorldAutoSteel (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Dual-phase DP450/DP500 cold-rolled and coated coil datasheets — ArcelorMittal / thyssenkrupp / Baosteel (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.