Steel FB590 · supply condition · default condition
Steel FB590-HR
Properties of the HR condition, compared with the other FB590 tempers.
Standard hot-rolled coil/sheet 1.6–8 mm for chassis, wheels and suspension arms where hole expansion and fatigue dominate.
What is FB590-HR?
FB590-HR is FB590 supplied in the HR condition — standard hot-rolled coil/sheet 1.6–8 mm for chassis, wheels and suspension arms where hole expansion and fatigue dominate. FB590-HR has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 630 MPa (91.4 ksi) — stronger than 63% of steel grades. Elongation at break is 21% and the elastic modulus is 210 GPa (30.5 Msi). FB590-HR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,480°C (2,696 °F).
Advantages
- Readily welded — 85/100, better than 83% of steel grades
- Forms and bends easily — 62/100, better than 78% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Limited service temperature — 300°C (572 °F), worse than 77% of steel grades
FB590-HR properties
Typical room-temperature values for FB590-HR — 9 properties are specific to this condition; the rest are grade-level values shared by every FB590 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
FB590-HR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,480°C (2,696 °F).
Mechanical15
FB590-HR has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 630 MPa (91.4 ksi) — stronger than 63% of steel grades. Elongation at break is 21% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
FB590-HR is rated for continuous service to 300°C (572 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 66% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
FB590-HR conducts electricity at 9 % IACS, better than 70% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of FB590-HR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 20%.
Manufacturability7
FB590-HR's machinability is fair (52/100, better than 52% of steel grades); weldability excellent (85/100); formability good (62/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other FB590 tempers and conditions
FB590 is also supplied in 3 other conditions. The full side-by-side table is on the FB590 overview.
- HRDefaultStandard hot-rolled coil/sheet 1.6–8 mm for chassis, wheels and suspension arms where hole expansion and fatigue dominate.500 MPa yield · 190 HB
Working with FB590-HR
Is FB590 easy to machine?
Rarely machined — blanked, laser or fine-cut; when drilled/milled use coated carbide, moderate speeds, rigid clamping to limit edge burr and work hardening.
Can FB590 be welded?
Excellent RSW, MAG and laser weldability at CE ≈ 0.32–0.38; keep heat input moderate to avoid HAZ softening, use matching or slightly undermatching filler, no preheat needed in sheet gauges.
Can FB590 be formed, bent or molded?
Cold stamp with generous radii (r ≥ 2t) and springback compensation; its strength lies in stretch-flanging — hole expansion typically 60–90 %, so trimmed edges tolerate severe flanging.
What surface finishes work on FB590?
Must be protected: zinc coating (+Z/+ZF), phosphate + e-coat, or paint; zinc-coated variants need adjusted RSW electrode force/current and cleaning before adhesive bonding.
FB590 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 |
|---|---|---|
| Clow C for weldability | ≤ 0.12 | 0.08 |
| Si | ≤ 0.6 | 0.25 |
| Mn | ≤ 2 | 1.5 |
| P | ≤ 0.03 | 0.02 |
| Slow S for hole expansion | ≤ 0.01 | 0 |
| Altotal Al, killed | 0.02 – 0.1 | 0.04 |
| Nbmicroalloy, Nb+Ti ≤ 0.15 | ≤ 0.09 | 0.03 |
| Timicroalloy | ≤ 0.15 | 0.05 |
| Voptional | ≤ 0.1 | — |
| Croptional, Cr+Mo ≤ 0.6 | ≤ 0.5 | — |
| Mooptional bainite promoter | ≤ 0.3 | — |
| Boptional | ≤ 0.01 | — |
| Fe | balance | — |
FB590-HR — frequently asked
What is FB590-HR used for?
FB590-HR is typically used for automotive wheel discs and rims, control arms, subframes and chassis brackets, longitudinal members, suspension links and stretch-flanged body reinforcements. In short: ferrite-bainite auto sheet.
What is the yield strength of FB590-HR?
FB590-HR has a typical yield strength of 500 MPa (72.5 ksi) and a tensile strength of 630 MPa (91.4 ksi) — stronger than 63% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is FB590-HR easy to machine?
Reasonably — machinability is rated fair (52/100, better than 52% of steel grades). Rarely machined — blanked, laser or fine-cut; when drilled/milled use coated carbide, moderate speeds, rigid clamping to limit edge burr and work hardening.
Can FB590-HR be welded?
Yes — weldability is rated excellent (85/100). Excellent RSW, MAG and laser weldability at CE ≈ 0.32–0.38; keep heat input moderate to avoid HAZ softening, use matching or slightly undermatching filler, no preheat needed in sheet gauges.
What surface finishes work on FB590-HR?
Must be protected: zinc coating (+Z/+ZF), phosphate + e-coat, or paint; zinc-coated variants need adjusted RSW electrode force/current and cleaning before adhesive bonding.
Can FB590-HR be formed, bent or molded?
Cold stamp with generous radii (r ≥ 2t) and springback compensation; its strength lies in stretch-flanging — hole expansion typically 60–90 %, so trimmed edges tolerate severe flanging.
What is the maximum service temperature of FB590-HR?
FB590-HR is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between FB590-HR and FB590 TMCP?
HR is the default condition — standard hot-rolled coil/sheet 1.6–8 mm for chassis, wheels and suspension arms where hole expansion and fatigue dominate. TMCP: mill route (controlled finish rolling + run-out-table cooling) giving finer ferrite/bainite, best low-temperature toughness and most uniform properties in heavier gauges. Yield strength is 500 MPa in HR versus 520 MPa in TMCP.
Can FabDigit make parts in FB590-HR?
Yes — FB590-HR 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 products of multiphase steels for cold forming (HDT580F) — CEN (2015)
- VDA 239-100 — Sheet steel for cold forming (FB grades) — VDA (2016)
- EN 10346 — Continuously hot-dip coated steel flat products — CEN (2015)
- Ferritic-bainitic steels FB 450 / FB 560 / FB 590 product data — ArcelorMittal (2022)
- Advanced high-strength steel FB grades — automotive steel guide — SSAB / Baosteel automotive sheet catalogues (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- WorldAutoSteel AHSS Application Guidelines v7 (FB steels) — WorldAutoSteel (2021)
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.