Steel 08F CR-Full-Hard
Supply condition
Choose cold rolled, as-rolled strip for flat blanks or as a galvanizing substrate needing 540 MPa tensile; at 4 % elongation it is hard and brittle, so no forming or tight bends.
Values for the CR-Full-Hard condition
Other 08F tempers and conditions
08F is listed in 6 conditions; see the grade overview at 08F.
- HR
- CR-Annealed
- Normalized
- Carburized
- CD
- CR-Full-Hard
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled | Pick hot rolled stock for thicker or low-cosmetic parts at the lowest price; accept mill scale, wide dimensional tolerances and the lower 195 MPa yield strength. | 195 | 320 | 38 | 110 HB | 12 % IACS |
CR-AnnealedDefault cold rolled, annealed sheet/strip | Use this cold rolled, annealed and skin-passed sheet as the default for general stampings, bends and enclosures, where 36 % elongation and a clean surface matter more than strength. | 200 | 330 | 36 | 105 HB | 12 % IACS |
900–930 °C, air cooled | Specify normalizing at 900–930 °C with air cooling to refine grain and remove rolling banding when a uniform structure is needed, including as pre-treatment before carburizing. | 205 | 335 | 37 | 110 HB | 12 % IACS |
case hardened 0.3–0.8 mm | Use carburizing and quenching to a 0.3–0.8 mm case at 59 HRC for small wear parts; the core stays soft low-strength steel and the part can no longer be formed. | 320 | 500 | 12 | 59 HRC | 11 % IACS |
Cold drawn | Pick cold drawn bar or wire for rivets, pins and cold-headed parts that need tight tolerances, good surface and 450 MPa tensile, accepting elongation reduced to 15 %. | 370 | 450 | 15 | 140 HB | 11.5 % IACS |
CR-Full-HardThis page cold rolled, as-rolled ( / ) | Choose cold rolled, as-rolled strip for flat blanks or as a galvanizing substrate needing 540 MPa tensile; at 4 % elongation it is hard and brittle, so no forming or tight bends. | 480 | 540 | 4 | 165 HB | 11.5 % IACS |
What is 08F CR-Full-Hard?
08F CR-Full-Hard is 08F supplied in the CR-Full-Hard condition — choose cold rolled, as-rolled strip for flat blanks or as a galvanizing substrate needing 540 MPa tensile; at 4 % elongation it is hard and brittle, so no forming or tight bends. 08F CR-Full-Hard has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 59% of steel grades. Elongation at break is 4% and the elastic modulus is 210 GPa (30.5 Msi). 08F CR-Full-Hard 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). CR-Annealed is the default condition FabDigit quotes; CR-Full-Hard is available on request or by drawing note.
Advantages
- Conducts heat well — 58 W/m·K (33.5 BTU/hr·ft·°F), better than 99% of steel grades
- High electrical conductivity — 11.5 % IACS, better than 99% of steel grades
- Readily welded — 88/100, better than 87% of steel grades
Limitations
- Limited ductility — 4%, worse than 98% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
08F CR-Full-Hard properties
Typical room-temperature values for 08F CR-Full-Hard; 22 are specific to this condition. Other listed values are 08F reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
08F CR-Full-Hard 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).
Mechanical16
08F CR-Full-Hard has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 59% of steel grades. Elongation at break is 4% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
08F CR-Full-Hard is rated for continuous service to 200°C (392 °F). It conducts heat at 58 W/m·K (33.5 BTU/hr·ft·°F), better than 99% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
08F CR-Full-Hard conducts electricity at 11.5 % 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 08F CR-Full-Hard 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
08F CR-Full-Hard's machinability is fair (52/100, better than 52% of steel grades); weldability excellent (88/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 08F CR-Full-Hard
Is 08F easy to machine?
Soft low-carbon steel smears and raises burrs; use sharp high-positive-rake tools, high speed and plenty of coolant. For automatic turning of small parts switch to a free-machining steel such as Y12 or 1215.
Can 08F be welded?
Carbon equivalent is very low, so resistance spot, CO2 gas-shielded MAG, submerged arc and brazing all run without preheat or post-weld heat treatment. Rimmed steel is slightly more porosity-prone, so use a deoxidised wire such as ER70S-6.
Can 08F be formed, bent or molded?
Cold bending, deep drawing and cold heading are good, but strain ageing causes Lueders bands and stretcher strains; skin-pass before stamping and use the material promptly. For demanding deep-drawn parts switch to 08Al or DC03.
What surface finishes work on 08F?
Surface protection is required: zinc or nickel electroplating, phosphating, hot-dip galvanizing, or e-coat plus paint. Subsurface porosity and segregation make mirror polishing and high-decorative plating unreliable.
08F 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 |
|---|---|---|
| CGB/T 699 | 0.05 – 0.11 | 0.08 |
| Sirimmed steel, not silicon-deoxidized | ≤ 0.03 | 0.02 |
| Mn | 0.25 – 0.5 | 0.38 |
| Pimpurity | ≤ 0.04 | 0.02 |
| Simpurity | ≤ 0.04 | 0.02 |
| Crresidual element | ≤ 0.1 | 0.05 |
| Niresidual element | ≤ 0.3 | 0.1 |
| Curesidual element | ≤ 0.25 | 0.1 |
| Fe | balance | — |
08F CR-Full-Hard — frequently asked
What is 08F CR-Full-Hard used for?
08F CR-Full-Hard is typically used for simple stampings, enclosures and low-cost sheet metal parts. In short: lowest-cost stamping steel; largely superseded by killed steels; very low carbon equivalent.
What is the yield strength of 08F CR-Full-Hard?
08F CR-Full-Hard has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 08F CR-Full-Hard easy to machine?
Reasonably — machinability is rated fair (52/100, better than 52% of steel grades). Soft low-carbon steel smears and raises burrs; use sharp high-positive-rake tools, high speed and plenty of coolant. For automatic turning of small parts switch to a free-machining steel such as Y12 or 1215.
Can 08F CR-Full-Hard be welded?
Yes — weldability is rated excellent (88/100). Carbon equivalent is very low, so resistance spot, CO2 gas-shielded MAG, submerged arc and brazing all run without preheat or post-weld heat treatment. Rimmed steel is slightly more porosity-prone, so use a deoxidised wire such as ER70S-6.
What surface finishes work on 08F CR-Full-Hard?
Surface protection is required: zinc or nickel electroplating, phosphating, hot-dip galvanizing, or e-coat plus paint. Subsurface porosity and segregation make mirror polishing and high-decorative plating unreliable.
Can 08F CR-Full-Hard be formed, bent or molded?
Cold bending, deep drawing and cold heading are good, but strain ageing causes Lueders bands and stretcher strains; skin-pass before stamping and use the material promptly. For demanding deep-drawn parts switch to 08Al or DC03.
What is the maximum service temperature of 08F CR-Full-Hard?
08F CR-Full-Hard 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 08F CR-Annealed and 08F-CD?
CR-Annealed is the default condition — use this cold rolled, annealed and skin-passed sheet as the default for general stampings, bends and enclosures, where 36 % elongation and a clean surface matter more than strength. CD: pick cold drawn bar or wire for rivets, pins and cold-headed parts that need tight tolerances, good surface and 450 MPa tensile, accepting elongation reduced to 15 %. Yield strength is 200 MPa in CR-Annealed versus 370 MPa in CD.
Sources
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels — ASM International (1990)
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.