Steel DP1470-BH
Heat-treated state
BH = after 2 % prestrain + paint bake
The in-service condition of a stamped, painted part: bake hardening lifts the yield strength by roughly 40–80 MPa with a small loss of remaining ductility.
Values for the BH condition
Other DP1470 tempers and conditions
DP1470 is listed in 2 conditions; see the grade overview at DP1470.
- CR
- BH
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
CRDefault Cold rolled | Standard uncoated cold-rolled DP1470 coil/blank for parts that will be e-coated or fully enclosed; lowest cost and best edge condition for laser blanking. | 1,120 | 1,520 | 5.5 | 45 HRC | 8.5 % IACS |
BHThis page After 2 % prestrain + paint bake | The in-service condition of a stamped, painted part: bake hardening lifts the yield strength by roughly 40–80 MPa with a small loss of remaining ductility. | 1,240 | 1,560 | 3.5 | 46 HRC | 8.5 % IACS |
What is DP1470-BH?
DP1470-BH is DP1470 heat treated to BH — the in-service condition of a stamped, painted part: bake hardening lifts the yield strength by roughly 40–80 MPa with a small loss of remaining ductility. DP1470-BH has a yield strength of 1,240 MPa (180 ksi) and a tensile strength of 1,560 MPa (226 ksi) — stronger than 94% of steel grades. Elongation at break is 3.5% and the elastic modulus is 205 GPa (29.7 Msi). DP1470-BH has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F). CR is the default condition FabDigit quotes; BH is available on request or by drawing note.
Advantages
- High strength — 1,240 MPa (180 ksi), better than 94% of steel grades
Limitations
- Limited ductility — 3.5%, worse than 98% of steel grades
- Difficult to machine — 16/100, worse than 98% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Limited formability — 12/100, worse than 92% of steel grades
- Low fracture toughness — 45 MPa·√m (41 ksi·√in), worse than 90% of steel grades
DP1470-BH properties
Typical room-temperature values for DP1470-BH; 20 are specific to this condition. Other listed values are DP1470 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
DP1470-BH has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
DP1470-BH has a yield strength of 1,240 MPa (180 ksi) and a tensile strength of 1,560 MPa (226 ksi) — stronger than 94% of steel grades. Elongation at break is 3.5% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
DP1470-BH is rated for continuous service to 200°C (392 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
DP1470-BH conducts electricity at 8.5 % IACS, better than 63% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of DP1470-BH takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 20%.
Manufacturability5
DP1470-BH's machinability is poor (16/100, worse than 98% of steel grades); weldability fair (48/100); formability not recommended (12/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with DP1470-BH
Is DP1470 easy to machine?
Rarely machined as sheet; drilling/trimming needs carbide or CBN at low speed and rigid clamping — laser or waterjet cutting is preferred, and mechanical shearing leaves work-hardened, crack-prone edges.
Can DP1470 be welded?
Resistance spot welding is standard but requires higher electrode force, pulsed or in-situ tempering schedules and wider stack-up windows; expect HAZ softening, reduced cross-tension strength, and LME risk on zinc-coated variants; arc welding degrades strength locally and should be avoided in load paths.
Can DP1470 be formed, bent or molded?
Cold stamping only, with high press tonnage, ~3–4 t minimum bend radius, generous springback compensation and mild-steel-free die materials (coated tool steel); sheared/pierced edges should be laser-cut, reamed or shaved to avoid edge cracking and delayed fracture.
What surface finishes work on DP1470?
Zinc coatings (GI/GA/EG/ZM) applied at the mill; phosphate + cathodic e-coat is standard for bare stock — avoid acid pickling or electroplating without bake-out because of hydrogen embrittlement sensitivity.
DP1470 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 |
|---|---|---|
| Ccontrols martensite hardness | 0.13 – 0.23 | 0.18 |
| Si | ≤ 0.8 | 0.3 |
| Mnhardenability | 1.5 – 2.6 | 2.1 |
| P | ≤ 0.04 | 0.01 |
| Slow S for hole expansion | ≤ 0.02 | 0 |
| Alincl. deoxidation | 0.02 – 1 | 0.04 |
| Cr+Mocombined limit per EN 10338 | ≤ 1.4 | 0.5 |
| Nb+Tigrain refinement | ≤ 0.15 | 0.05 |
| V | ≤ 0.2 | — |
| B | ≤ 0.01 | 0 |
| Curesidual | ≤ 0.2 | — |
| Fe | balance | — |
DP1470-BH — frequently asked
What is DP1470-BH used for?
DP1470-BH is typically used for rocker reinforcements, bumper beams and roof rails. In short: highest cold-stamped DP grade; 1520 MPa tensile sheet; formability at practical limit.
What is the yield strength of DP1470-BH?
DP1470-BH has a typical yield strength of 1,240 MPa (180 ksi) and a tensile strength of 1,560 MPa (226 ksi) — stronger than 94% of steel grades. Strength varies by condition: see the 2 listed tempers.
Is DP1470-BH easy to machine?
Not especially — machinability is rated poor (16/100, worse than 98% of steel grades). Rarely machined as sheet; drilling/trimming needs carbide or CBN at low speed and rigid clamping — laser or waterjet cutting is preferred, and mechanical shearing leaves work-hardened, crack-prone edges.
Can DP1470-BH be welded?
With care — weldability is rated fair (48/100). Resistance spot welding is standard but requires higher electrode force, pulsed or in-situ tempering schedules and wider stack-up windows; expect HAZ softening, reduced cross-tension strength, and LME risk on zinc-coated variants; arc welding degrades strength locally and should be avoided in load paths.
What surface finishes work on DP1470-BH?
Zinc coatings (GI/GA/EG/ZM) applied at the mill; phosphate + cathodic e-coat is standard for bare stock — avoid acid pickling or electroplating without bake-out because of hydrogen embrittlement sensitivity.
Can DP1470-BH be formed, bent or molded?
Cold stamping only, with high press tonnage, ~3–4 t minimum bend radius, generous springback compensation and mild-steel-free die materials (coated tool steel); sheared/pierced edges should be laser-cut, reamed or shaved to avoid edge cracking and delayed fracture.
What is the maximum service temperature of DP1470-BH?
DP1470-BH 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 DP1470-CR and DP1470-BH?
CR is the default condition — standard uncoated cold-rolled DP1470 coil/blank for parts that will be e-coated or fully enclosed; lowest cost and best edge condition for laser blanking. BH: the in-service condition of a stamped, painted part: bake hardening lifts the yield strength by roughly 40–80 MPa with a small loss of remaining ductility. Yield strength is 1,120 MPa in CR versus 1,240 MPa in BH.
Sources
- EN 10338 — Hot-rolled and cold-rolled multiphase steels for cold forming — CEN (2015)
- EN 10346 — Continuously hot-dip coated steel flat products — CEN (2015)
- VDA 239-100 — Sheet Steel for Cold Forming — VDA (2016)
- SAE J2745 — High Strength Dual Phase Steels — SAE International (2019)
- 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)
- AHSS DP grades product data (Dogal/Docol, ArcelorMittal Dual Phase, Baosteel BDP) — SSAB / ArcelorMittal / Baosteel (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.