Steel DD11 HRPO
Finish state · default condition
EN DD11
HRPO = hot rolled, pickled and oiled
Standard stocked condition: descaled, clean surface, ready for cold forming, welding and painting.
Values for the HRPO condition
Other DD11 tempers and conditions
DD11 is listed in 4 conditions; see the grade overview at DD11.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Normalized | Optional post-fabrication normalizing (~900 °C, air cool) to refine grain and restore ductility after severe cold work; not a standard mill delivery condition. | 210 | 360 | 35 | 105 HB | 11 % IACS |
HRPODefaultThis page Hot rolled, pickled and oiled | Standard stocked condition: descaled, clean surface, ready for cold forming, welding and painting. | 220 | 380 | 32 | 110 HB | 11 % IACS |
Hot rolled | Cheapest supply form for weldments and parts that will be shot-blasted or heavily painted; scale must be removed before forming dies or plating. | 225 | 385 | 31 | 112 HB | 11 % IACS |
Skin passed / temper rolled | Light temper pass to improve flatness and suppress stretcher strains (Lüders lines) on visible pressed panels; slightly higher yield, slightly lower elongation. | 250 | 395 | 29 | 118 HB | 11 % IACS |
What is DD11 HRPO?
DD11 HRPO is DD11 supplied in the HRPO condition — standard stocked condition: descaled, clean surface, ready for cold forming, welding and painting. DD11 HRPO has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 98% of steel grades. Elongation at break is 32% and the elastic modulus is 210 GPa (30.5 Msi). DD11 HRPO has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F).
Advantages
- High electrical conductivity — 11 % IACS, better than 98% of steel grades
- Readily welded — 95/100, better than 97% of steel grades
- Ductile — tolerates forming and impact — 32%, better than 95% of steel grades
- Conducts heat well — 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades
- Forms and bends easily — 75/100, better than 90% of steel grades
Limitations
- Low strength — 220 MPa (31.9 ksi), worse than 98% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
DD11 HRPO properties
Typical room-temperature values for DD11 HRPO; 22 are specific to this condition. Other listed values are DD11 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
DD11 HRPO has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F).
Mechanical16
DD11 HRPO has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 98% of steel grades. Elongation at break is 32% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
DD11 HRPO is rated for continuous service to 350°C (662 °F). It conducts heat at 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
DD11 HRPO conducts electricity at 11 % IACS, better than 98% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of DD11 HRPO takes about 25 MJ of energy and emits 2.1 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
DD11 HRPO's machinability is good (58/100, better than 75% of steel grades); weldability excellent (95/100); formability very good (75/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with DD11 HRPO
Is DD11 easy to machine?
Soft and gummy — use sharp positive-rake tools, generous feed and coolant to avoid built-up edge and burrs; expect ~60 % of AISI 1212 speeds.
Can DD11 be welded?
Excellent for MIG/MAG, TIG, resistance spot and laser welding with ER70S-6 class filler; CEV ≈0.20–0.25 so no preheat needed at typical sheet gauges.
Can DD11 be formed, bent or molded?
Good for bending, roll forming and moderate stamping (bend radius ≈1×t transverse); for deep drawing step up to DD12/DD13 or a cold-rolled DC grade.
What surface finishes work on DD11?
No anodizing; protect by painting, powder coating, zinc phosphating, electro-zinc or hot-dip galvanizing — bare surface rusts within days in humid air.
DD11 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 |
|---|---|---|
| Cladle analysis, EN 10111 | ≤ 0.12 | 0.08 |
| Mn | ≤ 0.6 | 0.4 |
| P | ≤ 0.05 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Fe | balance | — |
DD11 HRPO — frequently asked
What is DD11 HRPO used for?
DD11 HRPO is typically used for brackets, simple stampings, structural tube skelp and general fabrication. In short: cheapest formable hot band; weldable without preheat; entry-level DD grade.
What is the yield strength of DD11 HRPO?
DD11 HRPO has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 98% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is DD11 HRPO easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Soft and gummy — use sharp positive-rake tools, generous feed and coolant to avoid built-up edge and burrs; expect ~60 % of AISI 1212 speeds.
Can DD11 HRPO be welded?
Yes — weldability is rated excellent (95/100). Excellent for MIG/MAG, TIG, resistance spot and laser welding with ER70S-6 class filler; CEV ≈0.20–0.25 so no preheat needed at typical sheet gauges.
What surface finishes work on DD11 HRPO?
No anodizing; protect by painting, powder coating, zinc phosphating, electro-zinc or hot-dip galvanizing — bare surface rusts within days in humid air.
Can DD11 HRPO be formed, bent or molded?
Good for bending, roll forming and moderate stamping (bend radius ≈1×t transverse); for deep drawing step up to DD12/DD13 or a cold-rolled DC grade.
What is the maximum service temperature of DD11 HRPO?
DD11 HRPO is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between DD11 HRPO and DD11-SP?
HRPO is the default condition — standard stocked condition: descaled, clean surface, ready for cold forming, welding and painting. SP: light temper pass to improve flatness and suppress stretcher strains (Lüders lines) on visible pressed panels; slightly higher yield, slightly lower elongation. Yield strength is 220 MPa in HRPO versus 250 MPa in SP.
Sources
- EN 10111 — Continuously hot rolled low carbon steel sheet and strip for cold forming — CEN (2008)
- EN 10025-1 / EN 10027-2 material number 1.0332 — CEN (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol.13A — Corrosion — ASM International (2003)
- GB/T 912 / SPHC comparable hot-rolled low carbon sheet — SAC (2008)
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.