Steel 08Al CR-SP
Supply condition
GB 08Al · EN DC05
CR-SP = cR Skin-Passed / Temper Rolled
Choose when flat, stretcher-strain-free surface and tight thickness/surface roughness are required for exposed panels.
Values for the CR-SP condition
Other 08Al tempers and conditions
08Al is listed in 5 conditions; see the grade overview at 08Al.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
CR-ADefault CR Annealed | Standard stocked condition for stamped body panels and deep-drawn parts; lowest yield, highest r-value. | 150 | 300 | 42 | 88 HB | — |
CR-SPThis page CR Skin-Passed / Temper Rolled | Choose when flat, stretcher-strain-free surface and tight thickness/surface roughness are required for exposed panels. | 170 | 310 | 40 | 95 HB | 12 % IACS |
Normalized | Rare condition used for thicker 08Al plate/forging stock to refine grain and homogenize properties. | 200 | 330 | 36 | 100 HB | 12 % IACS |
Hot rolled | Thicker gauges (>2 mm) where surface finish is unimportant and cost dominates. | 220 | 340 | 35 | 105 HB | 12 % IACS |
Full Hard | Cheap high-strength substrate for further processing (galvanizing line, re-annealing) or flat, non-formed parts. | 500 | 560 | 3 | 170 HB | — |
What is 08Al CR-SP?
08Al CR-SP is 08Al supplied in the CR-SP condition — choose when flat, stretcher-strain-free surface and tight thickness/surface roughness are required for exposed panels. 08Al CR-SP has a yield strength of 170 MPa (24.7 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 99% of steel grades. Elongation at break is 40% and the elastic modulus is 207 GPa (30 Msi). 08Al CR-SP has a density of 7.87 g/cm³ (0.284 lb/in³), heavier than 92% of steel grades. It melts at 1,495°C (2,723 °F). CR-A is the default condition FabDigit quotes; CR-SP is available on request or by drawing note.
Advantages
- Conducts heat well — 60 W/m·K (34.7 BTU/hr·ft·°F), better than 100% of steel grades
- Ductile — tolerates forming and impact — 40%, better than 99% of steel grades
- High electrical conductivity — 12 % IACS, better than 99% of steel grades
- Forms and bends easily — 94/100, better than 99% of steel grades
- Readily welded — 95/100, better than 97% of steel grades
Limitations
- Low strength — 170 MPa (24.7 ksi), worse than 99% of steel grades
08Al CR-SP properties
Typical room-temperature values for 08Al CR-SP; 20 are specific to this condition. Other listed values are 08Al reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
08Al CR-SP has a density of 7.87 g/cm³ (0.284 lb/in³), heavier than 92% of steel grades. It melts at 1,495°C (2,723 °F).
Mechanical14
08Al CR-SP has a yield strength of 170 MPa (24.7 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 99% of steel grades. Elongation at break is 40% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
08Al CR-SP is rated for continuous service to 350°C (662 °F). It conducts heat at 60 W/m·K (34.7 BTU/hr·ft·°F), better than 100% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
08Al CR-SP conducts electricity at 12 % IACS, better than 99% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of 08Al CR-SP takes about 25 MJ of energy and emits 2.1 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 20%.
Manufacturability7
08Al CR-SP's machinability is good (57/100, better than 71% of steel grades); weldability excellent (95/100); formability excellent (94/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 08Al CR-SP
Is 08Al easy to machine?
Very soft and gummy — use sharp positive-rake tools, high speed and good chip control; deburring after blanking is the usual issue rather than tool wear.
Can 08Al be welded?
Excellent: carbon equivalent well below 0.2, ideal for resistance spot, MAG, laser and projection welding with no preheat (reduce current/adjust electrodes on galvanized variants).
Can 08Al be formed, bent or molded?
Designed for deep drawing — high r̄ (≈1.8–2.2) and n (≈0.22); use draw oil, keep blank holder low, and stamp within ~3–6 months of production to avoid strain-ageing Lüders bands.
What surface finishes work on 08Al?
No anodizing; standard routes are zinc phosphate + e-coat/paint, hot-dip or electro galvanizing, or oil for temporary protection — bare surfaces flash-rust quickly.
08Al 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 |
|---|---|---|
| C≤0.08 % typical for deep-drawing 08Al; older GB 710 allowed 0.05–0.11 % | ≤ 0.08 | 0.05 |
| Sikept low (Al-killed, not Si-killed) | ≤ 0.03 | 0.02 |
| Mn | 0.2 – 0.45 | 0.32 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Alacid-soluble Als ≥0.015 % — the defining deoxidizer | 0.02 – 0.07 | 0.04 |
| Ncontrolled to limit strain ageing | ≤ 0.01 | 0 |
| Fe | balance | — |
08Al CR-SP — frequently asked
What is 08Al CR-SP used for?
08Al CR-SP is typically used for automotive body panels, deep-drawn stampings and appliance shells. In short: deep-drawing benchmark sheet; highest formability, low strength; excellent spot weldability.
What is the yield strength of 08Al CR-SP?
08Al CR-SP has a typical yield strength of 170 MPa (24.7 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 99% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 08Al CR-SP easy to machine?
Reasonably — machinability is rated good (57/100, better than 71% of steel grades). Very soft and gummy — use sharp positive-rake tools, high speed and good chip control; deburring after blanking is the usual issue rather than tool wear.
Can 08Al CR-SP be welded?
Yes — weldability is rated excellent (95/100). Excellent: carbon equivalent well below 0.2, ideal for resistance spot, MAG, laser and projection welding with no preheat (reduce current/adjust electrodes on galvanized variants).
What surface finishes work on 08Al CR-SP?
No anodizing; standard routes are zinc phosphate + e-coat/paint, hot-dip or electro galvanizing, or oil for temporary protection — bare surfaces flash-rust quickly.
Can 08Al CR-SP be formed, bent or molded?
Designed for deep drawing — high r̄ (≈1.8–2.2) and n (≈0.22); use draw oil, keep blank holder low, and stamp within ~3–6 months of production to avoid strain-ageing Lüders bands.
What is the maximum service temperature of 08Al CR-SP?
08Al CR-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 08Al CR-A and 08Al CR-FH?
CR-A is the default condition — standard stocked condition for stamped body panels and deep-drawn parts; lowest yield, highest r-value. CR-FH: cheap high-strength substrate for further processing (galvanizing line, re-annealing) or flat, non-formed parts. Yield strength is 150 MPa in CR-A versus 500 MPa in CR-FH.
Sources
- EN 10130 Cold rolled low carbon steel flat products (DC01–DC06) — CEN (2006)
- JIS G 3141 Cold-reduced carbon steel sheets and strip (SPCE/SPCEN) — JISC (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Baosteel cold-rolled deep-drawing steel coil datasheet (2022)
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.