Steel S450J0 +AR (Hot rolled)
Heat-treated state · default condition
EN S450J0
Standard stock condition for plate, sections and flats up to about 40 mm where 0 °C toughness suffices.
Values for the +AR condition
Other S450J0 tempers and conditions
S450J0 is listed in 4 conditions; see the grade overview at S450J0.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+N heavy section | Use when design thickness exceeds 40 mm; standard requires reduced minimum yield/tensile values. | 410 | 590 | 19 | 175 HB | 9.5 % IACS |
Normalized | Choose for heavy plate, better through-thickness uniformity and more reliable low-temperature impact energy. | 475 | 610 | 22 | 180 HB | 9.5 % IACS |
Hot-dip galvanized product | Pick for outdoor structures needing 20+ year maintenance-free corrosion protection without painting. | 475 | 615 | 20 | 183 HB | 9.5 % IACS |
+ARDefaultThis page Hot rolled | Standard stock condition for plate, sections and flats up to about 40 mm where 0 °C toughness suffices. | 480 | 620 | 20 | 185 HB | 9.5 % IACS |
What is S450J0 +AR?
S450J0 +AR is S450J0 heat treated to +AR — standard stock condition for plate, sections and flats up to about 40 mm where 0 °C toughness suffices. S450J0 +AR has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 59% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi). S450J0 +AR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Advantages
- High electrical conductivity — 9.5 % IACS, better than 75% of steel grades
- Readily welded — 72/100, better than 75% of steel grades
Limitations
- Hard to polish — 40/100, worse than 96% of steel grades
S450J0 +AR properties
Typical room-temperature values for S450J0 +AR; 22 are specific to this condition. Other listed values are S450J0 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
S450J0 +AR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
S450J0 +AR has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 59% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S450J0 +AR is rated for continuous service to 350°C (662 °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
S450J0 +AR conducts electricity at 9.5 % IACS, better than 75% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of S450J0 +AR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
S450J0 +AR's machinability is fair (45/100, worse than 65% of steel grades); weldability very good (72/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S450J0 +AR
Is S450J0 easy to machine?
Machines like a tough medium-carbon steel — use rigid setups, coated carbide, moderate speeds (~120–160 m/min) and positive rake to control built-up edge.
Can S450J0 be welded?
Weldable by SMAW/GMAW/SAW with low-hydrogen consumables; CEV ≈ 0.47 means preheat 100–150 °C for thick or restrained joints and control interpass heat input.
Can S450J0 be formed, bent or molded?
Cold bending needs larger radii than S355 (typically ≥2.0–2.5 t transverse); hot forming above 900 °C should be followed by normalizing.
What surface finishes work on S450J0?
No anodizing; specify shot-blast plus zinc-rich primer, hot-dip galvanizing or duplex coating for exterior service.
S450J0 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 |
|---|---|---|
| Cmax for all thicknesses | ≤ 0.2 | 0.18 |
| Si | ≤ 0.55 | 0.35 |
| Mn | ≤ 1.7 | 1.55 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.04 | 0.02 |
| Nmay be exceeded if sufficient N-binding elements present | ≤ 0.03 | 0.01 |
| Cu | ≤ 0.55 | 0.2 |
| CEVcarbon equivalent, t ≤ 40 mm (0.49 for thicker) | ≤ 0.47 | 0.45 |
| Fe | balance | — |
S450J0 +AR — frequently asked
What is S450J0 +AR used for?
S450J0 +AR is typically used for heavy structural sections, load-bearing frames, cranes and mobile equipment structures. In short: higher-yield structural carbon steel; weight-saving alternative to S355; weldable with preheat control.
What is the yield strength of S450J0 +AR?
S450J0 +AR has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is S450J0 +AR easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machines like a tough medium-carbon steel — use rigid setups, coated carbide, moderate speeds (~120–160 m/min) and positive rake to control built-up edge.
Can S450J0 +AR be welded?
Yes — weldability is rated very good (72/100). Weldable by SMAW/GMAW/SAW with low-hydrogen consumables; CEV ≈ 0.47 means preheat 100–150 °C for thick or restrained joints and control interpass heat input.
What surface finishes work on S450J0 +AR?
No anodizing; specify shot-blast plus zinc-rich primer, hot-dip galvanizing or duplex coating for exterior service.
Can S450J0 +AR be formed, bent or molded?
Cold bending needs larger radii than S355 (typically ≥2.0–2.5 t transverse); hot forming above 900 °C should be followed by normalizing.
What is the maximum service temperature of S450J0 +AR?
S450J0 +AR 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.
Sources
- EN 10025-2 Hot rolled products of structural steels – Non-alloy structural steels — CEN (2019)
- ASTM A572/A572M High-Strength Low-Alloy Columbium-Vanadium Structural Steel — ASTM (2021)
- ASM Handbook Vol.1 – Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- EN 1993-1-1 / EN 1993-1-2 Eurocode 3 material and thermal properties — CEN (2005)
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.