Steel S355JR
EN S355JR · JIS SM490A · GB Q355B
S355JR (W.-Nr. 1.0045) is a high-strength low-carbon structural steel with a minimum yield of 355 MPa, cross-referenced to Q355B, SM490A and A572 Grade 50.
Reference datasheet — S355JR is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AR condition
S355JR tempers and conditions
S355JR is supplied in 6 conditions, soft to hard. AR is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
as-rolled, t = 40–80 mm | Thick as-rolled plate; use when heavy sections are needed, noting the standard's reduced minimum yield. | 350 | 520 | 24 | 155 HB | 9 % IACS |
Stress relieved | Use for welded fabrications and heavily machined frames where residual stress and distortion must be controlled. | 380 | 530 | 26 | 152 HB | 9 % IACS |
Normalized | Choose for fine, uniform grain, better through-thickness toughness and post-forming property recovery on heavy plate. | 395 | 540 | 27 | 155 HB | — |
ARDefault as-rolled (hot rolled), t ≤ 16 mm | Standard stocked hot-rolled plate, section and coil; cheapest route for general structures. | 400 | 550 | 25 | 160 HB | — |
Thermomechanically controlled processed | Pick for lower carbon equivalent, best weldability with minimal preheat and good low-temperature toughness in plate. | 425 | 520 | 28 | 165 HB | 9 % IACS |
Cold drawn | Cold-drawn bright bar for shafts and machined parts needing tight tolerance, better finish and higher strength. | 520 | 620 | 12 | 200 HB | 9 % IACS |
Supply forms, finishes and certifications
Ways S355JR is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
HDG | Hot-dip galvanized (EN ISO 1461) hot-rolled product | Coating |
What is S355JR?
S355JR (W.-Nr. 1.0045) is a high-strength low-carbon structural steel with a minimum yield of 355 MPa, cross-referenced to Q355B, SM490A and A572 Grade 50. It is used where more load capacity or weight saving is needed than S235/S275 allows while keeping good weldability (score 85); plate, section, tube and bar are available as-rolled, normalized, thermomechanically rolled, cold-drawn, stress-relieved and hot-dip galvanized. Default values are 400 MPa yield, 550 MPa tensile, 25 % elongation and 160 HB. JR designates room-temperature impact testing only, so specify J0/J2 for low-temperature toughness; the steel has no inherent corrosion resistance. S355JR 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). S355JR has a yield strength of 400 MPa (58 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 60% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi).
What is S355JR used for?
- Heavy structural steelwork
- Cranes
- Bridges
- Mobile equipment chassis
- Load-bearing frames
Advantages
- Readily welded — 85/100, better than 83% of steel grades
- Forms and bends easily — 62/100, better than 78% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
S355JR properties
Typical room-temperature values for S355JR-AR; bars are the position among steel grades.
Physical3
S355JR 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
S355JR has a yield strength of 400 MPa (58 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 60% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S355JR 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
S355JR conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of S355JR takes about 25 MJ of energy and emits 2.1 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
S355JR's machinability is good (60/100, better than 83% 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.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. S355JR is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S355JR
Is S355JR easy to machine?
Machines like a medium-carbon steel — moderate tool wear, gummy chips in the as-rolled condition; use coated carbide, positive rake and generous coolant.
Can S355JR be welded?
Excellent weldability by all arc processes with CEV ≤ 0.45; preheat 100–150 °C only for thick sections or restraint, and use low-hydrogen consumables (E7018 / ER70S-6).
Can S355JR be formed, bent or molded?
Cold bends readily at 2–3 t inner radius across the rolling direction; hot forming 900–1050 °C followed by normalizing restores toughness.
S355JR 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 0.24 % for t ≤ 16 mm (EN 10025-2) | ≤ 0.24 | 0.18 |
| Si | ≤ 0.55 | 0.25 |
| Mn | ≤ 1.6 | 1.35 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.04 | 0.02 |
| Nnot applicable if sufficient N-binding elements present | ≤ 0.01 | 0.01 |
| Cu | ≤ 0.55 | 0.2 |
| CEVcarbon equivalent (IIW), t ≤ 30 mm | ≤ 0.45 | 0.42 |
| Fe | balance |
What surface finishes work on S355JR?
No natural corrosion protection — shot-blast to Sa 2.5 then zinc-rich primer, epoxy paint, or hot-dip galvanize per EN ISO 1461.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel S355JR in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does S355JR cost?
S355JR is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
S355JR — frequently asked
What is S355JR used for?
S355JR is typically used for heavy structural steelwork, cranes, bridges, mobile equipment chassis and load-bearing frames. In short: weldable 355 MPa structural steel; stronger than S235/S275; widely stocked plate and section.
What is the yield strength of S355JR?
S355JR has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 60% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is S355JR easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like a medium-carbon steel — moderate tool wear, gummy chips in the as-rolled condition; use coated carbide, positive rake and generous coolant.
Can S355JR be welded?
Yes — weldability is rated excellent (85/100). Excellent weldability by all arc processes with CEV ≤ 0.45; preheat 100–150 °C only for thick sections or restraint, and use low-hydrogen consumables (E7018 / ER70S-6).
What surface finishes work on S355JR?
No natural corrosion protection — shot-blast to Sa 2.5 then zinc-rich primer, epoxy paint, or hot-dip galvanize per EN ISO 1461.
Can S355JR be formed, bent or molded?
Cold bends readily at 2–3 t inner radius across the rolling direction; hot forming 900–1050 °C followed by normalizing restores toughness.
What is the maximum service temperature of S355JR?
S355JR 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 S355JR-AR and S355JR-CD?
AR is the default condition — standard stocked hot-rolled plate, section and coil; cheapest route for general structures. CD: cold-drawn bright bar for shafts and machined parts needing tight tolerance, better finish and higher strength. Yield strength is 400 MPa in AR versus 520 MPa in CD.
How much does S355JR cost?
S355JR is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10025-2 Hot rolled products of structural steels — Non-alloy structural steels — CEN (2019)
- ASTM A572/A572M Grade 50 — ASTM International (2021)
- EN 1993-1-1 / EN 1993-1-2 Eurocode 3 design of steel structures — CEN (2005)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Structural steel S355 plate data sheets — SSAB / Dillinger / thyssenkrupp (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.