Steel DP980-LY
Grade
LY = low-yield (Y550-class) DP980 variant, higher n-value
Select when stretch formability and springback control matter more than crash yield strength (deeper draws, complex geometry).
Values for the LY condition
Other DP980 tempers and conditions
DP980 is listed in 3 conditions; see the grade overview at DP980.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
LYThis page Low-yield (Y550-class) DP980 variant, higher n-value | Select when stretch formability and springback control matter more than crash yield strength (deeper draws, complex geometry). | 620 | 1,010 | 11 | 30 HRC | 9 % IACS |
CRDefault Cold rolled | Default stocked condition: bare cold-rolled coil/blank for structural stampings that are later e-coated or painted. | 680 | 1,030 | 9 | 32 HRC | — |
High-yield (Y700-class) DP980 variant | Pick for crash/anti-intrusion members where high yield and dent/collapse resistance dominate and forming is mild (roll forming, simple stampings). | 780 | 1,050 | 8 | 33 HRC | 9 % IACS |
What is DP980-LY?
DP980-LY is DP980 in the LY grade — select when stretch formability and springback control matter more than crash yield strength (deeper draws, complex geometry). DP980-LY has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,010 MPa (146 ksi) — stronger than 78% of steel grades. Elongation at break is 11% and the elastic modulus is 210 GPa (30.5 Msi). DP980-LY 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; LY is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 78% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Difficult to machine — 27/100, worse than 92% of steel grades
- Limited ductility — 11%, worse than 89% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
DP980-LY properties
Typical room-temperature values for DP980-LY; 22 are specific to this condition. Other listed values are DP980 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
DP980-LY 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).
Mechanical12
DP980-LY has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,010 MPa (146 ksi) — stronger than 78% of steel grades. Elongation at break is 11% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
DP980-LY is rated for continuous service to 200°C (392 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 66% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
DP980-LY conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of DP980-LY takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 20%.
Manufacturability7
DP980-LY's machinability is poor (27/100, worse than 92% of steel grades); weldability good (62/100); formability fair (42/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with DP980-LY
Is DP980 easy to machine?
Rarely machined; trim/pierce with high-hardness (PM or carbide) tooling, ≥12 % clearance and shear angles to limit edge cracking, since cut edges lose local ductility.
Can DP980 be welded?
Resistance spot weldable but use lower current with longer/pulsed schedules plus post-weld tempering pulse to reduce HAZ softening and interfacial (button-pullout) failure; for arc/laser welds keep heat input low and avoid hydrogen-bearing consumables.
Can DP980 be formed, bent or molded?
Cold formable but low total elongation and hole-expansion: allow 3–5× more springback compensation than mild steel, use generous bend radii (≈3–4 t), minimize burr and stretched edges, and expect high press tonnage (~2–3× mild steel).
What surface finishes work on DP980?
No inherent corrosion resistance — supply as GI/GA/EG coil or phosphate + cathodic e-coat/paint; avoid acid pickling or electroplating without immediate bake-out because of delayed hydrogen-assisted cracking risk.
DP980 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 | 0.08 – 0.17 | 0.13 |
| Mnhardenability | 1.5 – 2.6 | 2.2 |
| Si | 0.1 – 0.8 | 0.4 |
| CrCr+Mo typically ≤1.0 % | 0 – 0.6 | 0.25 |
| Mosuppresses bainite/pearlite on cooling | 0 – 0.4 | 0.2 |
| Aldeoxidation | 0.02 – 0.1 | 0.04 |
| Nbmicroalloy, grain refinement | 0 – 0.06 | 0.03 |
| Timicroalloy | 0 – 0.06 | 0.02 |
| Pimpurity limit | ≤ 0.04 | 0.01 |
| Simpurity limit | ≤ 0.02 | 0 |
| Boptional, some producers | 0 – 0.01 | — |
| Fe | balance | — |
DP980-LY — frequently asked
What is DP980-LY used for?
DP980-LY is typically used for bumper beams, B-pillar reinforcements, rocker and sill beams, front and rear rails, door intrusion beams and seat frame structures. In short: premium dual-phase sheet.
What is the yield strength of DP980-LY?
DP980-LY has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,010 MPa (146 ksi) — stronger than 78% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is DP980-LY easy to machine?
Not especially — machinability is rated poor (27/100, worse than 92% of steel grades). Rarely machined; trim/pierce with high-hardness (PM or carbide) tooling, ≥12 % clearance and shear angles to limit edge cracking, since cut edges lose local ductility.
Can DP980-LY be welded?
Yes — weldability is rated good (62/100). Resistance spot weldable but use lower current with longer/pulsed schedules plus post-weld tempering pulse to reduce HAZ softening and interfacial (button-pullout) failure; for arc/laser welds keep heat input low and avoid hydrogen-bearing consumables.
What surface finishes work on DP980-LY?
No inherent corrosion resistance — supply as GI/GA/EG coil or phosphate + cathodic e-coat/paint; avoid acid pickling or electroplating without immediate bake-out because of delayed hydrogen-assisted cracking risk.
Can DP980-LY be formed, bent or molded?
Cold formable but low total elongation and hole-expansion: allow 3–5× more springback compensation than mild steel, use generous bend radii (≈3–4 t), minimize burr and stretched edges, and expect high press tonnage (~2–3× mild steel).
What is the maximum service temperature of DP980-LY?
DP980-LY 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 DP980-CR and DP980-HY?
CR is the default condition — default stocked condition: bare cold-rolled coil/blank for structural stampings that are later e-coated or painted. HY: pick for crash/anti-intrusion members where high yield and dent/collapse resistance dominate and forming is mild (roll forming, simple stampings). Yield strength is 680 MPa in CR versus 780 MPa in HY.
Can FabDigit make parts in DP980-LY?
Yes — DP980-LY is available for sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- EN 10338 — Hot-rolled and cold-rolled uncoated multiphase steel products (HCT980X) — CEN (2015)
- VDA 239-100 — Sheet steel for cold forming (CR700Y980T-DP) — VDA (2016)
- Advanced High-Strength Steels Application Guidelines v7.0 — WorldAutoSteel (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Dual-phase DP980 cold-rolled and coated steel datasheets — Baosteel / ArcelorMittal / POSCO (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.