Steel DD13 HR-SP
Supply condition
EN DD13
HR-SP = hot rolled, skin-passed
Pick skin-passed (temper rolled) sheet to suppress the yield plateau and Lüders bands and improve flatness on visible stampings, accepting slightly lower formability.
Values for the HR-SP condition
Other DD13 tempers and conditions
DD13 is listed in 3 conditions; see the grade overview at DD13.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled, pickled and oiled | Choose pickled and oiled hot-rolled sheet when a scale-free, corrosion-protected surface is needed for direct stamping, welding and later painting or galvanizing. | 225 | 335 | 37 | 103 HB | 11 % IACS |
HRDefault Hot rolled | Use this as-rolled hot band with mill scale as the most common stock condition for general formed parts that will be stamped, bent and then painted. | 230 | 340 | 36 | 105 HB | 11 % IACS |
HR-SPThis page Hot rolled, skin-passed | Pick skin-passed (temper rolled) sheet to suppress the yield plateau and Lüders bands and improve flatness on visible stampings, accepting slightly lower formability. | 245 | 345 | 34 | 110 HB | 11 % IACS |
What is DD13 HR-SP?
DD13 HR-SP is DD13 supplied in the HR-SP condition — pick skin-passed (temper rolled) sheet to suppress the yield plateau and Lüders bands and improve flatness on visible stampings, accepting slightly lower formability. DD13 HR-SP has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 345 MPa (50 ksi) — weaker than 95% of steel grades. Elongation at break is 34% and the elastic modulus is 210 GPa (30.5 Msi). DD13 HR-SP has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F). HR is the default condition FabDigit quotes; HR-SP is available on request or by drawing note.
Advantages
- Conducts heat well — 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades
- High electrical conductivity — 11 % IACS, better than 98% of steel grades
- Forms and bends easily — 88/100, better than 98% of steel grades
- Ductile — tolerates forming and impact — 34%, better than 97% of steel grades
- Readily welded — 95/100, better than 97% of steel grades
Limitations
- Hard to polish — 40/100, worse than 96% of steel grades
- Low strength — 245 MPa (35.5 ksi), worse than 95% of steel grades
DD13 HR-SP properties
Typical room-temperature values for DD13 HR-SP; 22 are specific to this condition. Other listed values are DD13 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
DD13 HR-SP has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F).
Mechanical15
DD13 HR-SP has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 345 MPa (50 ksi) — weaker than 95% of steel grades. Elongation at break is 34% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
DD13 HR-SP is rated for continuous service to 350°C (662 °F). It conducts heat at 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
DD13 HR-SP 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 DD13 HR-SP takes about 23 MJ of energy and emits 2 kg of CO₂ — less than 98% of steel grades. Typical recycled content is 25%.
Manufacturability7
DD13 HR-SP's machinability is good (60/100, better than 83% of steel grades); weldability excellent (95/100); formability excellent (88/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with DD13 HR-SP
Is DD13 easy to machine?
Very soft and free-cutting but gummy and burr-prone — use sharp, high positive-rake tools, higher cutting speeds and ample coolant; drilling and punching present no difficulty.
Can DD13 be welded?
Carbon equivalent is very low, so resistance spot, MAG, laser and seam welding need no preheat or post-weld heat treatment, and the heat-affected zone does not harden.
Can DD13 be formed, bent or molded?
Deep drawing, flanging and small-radius bending are better than DD11/DD12; killed-steel supply avoids Lüders bands from aging, and skin-passed or pickled sheet is recommended before forming.
What surface finishes work on DD13?
Pickle to remove scale, then phosphate, e-coat, powder coat or hot-dip galvanize; bare material shows rust within days in humid environments.
DD13 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 |
|---|---|---|
| Cheat analysis maximum (EN 10111) | ≤ 0.08 | 0.05 |
| Mn | ≤ 0.4 | 0.25 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Altotal Al, killed steel deoxidation (optional requirement) | ≥ 0.02 | 0.04 |
| Fe | balance | — |
DD13 HR-SP — frequently asked
What is DD13 HR-SP used for?
DD13 HR-SP is typically used for chassis brackets, wheel rims and structural stampings. In short: most formable hot band; tight bends without cold-rolled cost; aging-resistant killed steel.
What is the yield strength of DD13 HR-SP?
DD13 HR-SP has a typical yield strength of 245 MPa (35.5 ksi) and a tensile strength of 345 MPa (50 ksi) — weaker than 95% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is DD13 HR-SP easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Very soft and free-cutting but gummy and burr-prone — use sharp, high positive-rake tools, higher cutting speeds and ample coolant; drilling and punching present no difficulty.
Can DD13 HR-SP be welded?
Yes — weldability is rated excellent (95/100). Carbon equivalent is very low, so resistance spot, MAG, laser and seam welding need no preheat or post-weld heat treatment, and the heat-affected zone does not harden.
What surface finishes work on DD13 HR-SP?
Pickle to remove scale, then phosphate, e-coat, powder coat or hot-dip galvanize; bare material shows rust within days in humid environments.
Can DD13 HR-SP be formed, bent or molded?
Deep drawing, flanging and small-radius bending are better than DD11/DD12; killed-steel supply avoids Lüders bands from aging, and skin-passed or pickled sheet is recommended before forming.
What is the maximum service temperature of DD13 HR-SP?
DD13 HR-SP 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 DD13-HR and DD13 HR-SP?
HR is the default condition — use this as-rolled hot band with mill scale as the most common stock condition for general formed parts that will be stamped, bent and then painted. HR-SP: pick skin-passed (temper rolled) sheet to suppress the yield plateau and Lüders bands and improve flatness on visible stampings, accepting slightly lower formability. Yield strength is 230 MPa in HR versus 245 MPa in HR-SP.
Sources
- EN 10111 — Continuously hot rolled low carbon steel sheet and strip for cold forming — CEN (2008)
- ASTM A370 — Mechanical Testing of Steel Products (hardness/strength conversions) — ASTM (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- worldsteel LCI data for hot rolled coil — World Steel Association (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.