Steel CP800 · supply condition · default condition
Steel CP800-CR
Properties of the CR condition, compared with the other CP800 tempers.
Standard uncoated cold-rolled CP800 coil/blank for stamped and roll-formed structural parts that will be painted or e-coated.
What is CP800-CR?
CP800-CR is CP800 supplied in the CR condition — standard uncoated cold-rolled CP800 coil/blank for stamped and roll-formed structural parts that will be painted or e-coated. CP800-CR has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 840 MPa (122 ksi) — stronger than 78% of steel grades. Elongation at break is 13% and the elastic modulus is 210 GPa (30.5 Msi). CP800-CR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
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
- Hard to polish — 45/100, worse than 84% of steel grades
- Difficult to machine — 35/100, worse than 83% of steel grades
- Limited ductility — 13%, worse than 78% of steel grades
CP800-CR properties
Typical room-temperature values for CP800-CR — 9 properties are specific to this condition; the rest are grade-level values shared by every CP800 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
CP800-CR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical14
CP800-CR has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 840 MPa (122 ksi) — stronger than 78% of steel grades. Elongation at break is 13% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
CP800-CR is rated for continuous service to 200°C (392 °F). It conducts heat at 38 W/m·K (22 BTU/hr·ft·°F), worse than 68% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
CP800-CR conducts electricity at 7.8 % IACS, worse than 58% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of CP800-CR takes about 28 MJ of energy and emits 2.2 kg of CO₂ — less than 56% of steel grades. Typical recycled content is 20%.
Manufacturability7
CP800-CR's machinability is fair (35/100, worse than 83% of steel grades); weldability very good (70/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other CP800 tempers and conditions
CP800 is also supplied in 4 other conditions. The full side-by-side table is on the CP800 overview.
- CRDefaultStandard uncoated cold-rolled CP800 coil/blank for stamped and roll-formed structural parts that will be painted or e-coated.620 MPa yield · 250 HB
Working with CP800-CR
Is CP800 easy to machine?
Machine only for trimming/piercing: use carbide or PVD-coated punches, generous clearance and rigid setups; high work-hardening makes drilling and tapping slow.
Can CP800 be welded?
Good resistance spot weldability with low CEV; use adaptive/pulsed schedules and post-weld temper pulses, and low-hydrogen practice for GMAW to avoid HAZ softening and cold cracking.
Can CP800 be formed, bent or molded?
Excellent stretch-flanging and hole expansion but limited total elongation — design for large springback compensation, high press tonnage and wear-resistant tool coatings.
What surface finishes work on CP800?
Not anodizable; supply as GI/GA/EG zinc-coated or phosphate + cathodic e-coat; avoid electroplating processes with hydrogen embrittlement risk on high-strength gauges.
CP800 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 |
|---|---|---|
| CEN 10338 HCT780C max | ≤ 0.18 | 0.12 |
| Si | ≤ 0.8 | 0.4 |
| Mn | ≤ 2.2 | 1.9 |
| P | ≤ 0.08 | 0.02 |
| S | ≤ 0.02 | 0 |
| Altotal Al | 0.02 – 2 | 0.04 |
| Cr+Mohardenability / bainite stabilisers | ≤ 1 | 0.35 |
| Nb+Timicroalloy precipitation strengthening | ≤ 0.15 | 0.06 |
| V | ≤ 0.2 | 0.01 |
| B | ≤ 0.01 | 0 |
| Fe | balance | — |
CP800-CR — frequently asked
What is CP800-CR used for?
CP800-CR is typically used for automotive bumper beams, B-pillar reinforcements, side-impact door beams, seat frame structures, roll-formed chassis and sill members and wheel discs and rims. In short: complex-phase auto sheet.
What is the yield strength of CP800-CR?
CP800-CR has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 840 MPa (122 ksi) — stronger than 78% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is CP800-CR easy to machine?
Not especially — machinability is rated fair (35/100, worse than 83% of steel grades). Machine only for trimming/piercing: use carbide or PVD-coated punches, generous clearance and rigid setups; high work-hardening makes drilling and tapping slow.
Can CP800-CR be welded?
Yes — weldability is rated very good (70/100). Good resistance spot weldability with low CEV; use adaptive/pulsed schedules and post-weld temper pulses, and low-hydrogen practice for GMAW to avoid HAZ softening and cold cracking.
What surface finishes work on CP800-CR?
Not anodizable; supply as GI/GA/EG zinc-coated or phosphate + cathodic e-coat; avoid electroplating processes with hydrogen embrittlement risk on high-strength gauges.
Can CP800-CR be formed, bent or molded?
Excellent stretch-flanging and hole expansion but limited total elongation — design for large springback compensation, high press tonnage and wear-resistant tool coatings.
What is the maximum service temperature of CP800-CR?
CP800-CR 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 CP800-CR and CP800-HR?
CR is the default condition — standard uncoated cold-rolled CP800 coil/blank for stamped and roll-formed structural parts that will be painted or e-coated. HR: hot-rolled CP800 in thicker gauges (2–8 mm) for chassis, wheels and suspension arms where stretch-flange (hole expansion) capability dominates. Yield strength is 620 MPa in CR versus 660 MPa in HR.
Can FabDigit make parts in CP800-CR?
Yes — CP800-CR is available for sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- EN 10338 — Hot rolled and cold rolled uncoated multiphase steel products for cold forming — CEN (2015)
- VDA 239-100 — Sheet Steel for Cold Forming — VDA (2016)
- Advanced High-Strength Steels Application Guidelines V7 — WorldAutoSteel (2021)
- Complex phase steel CP-W / CP-K product information — thyssenkrupp Steel Europe (2022)
- Complex Phase steels for automotive body and chassis — ArcelorMittal (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.