What is the density of S355JR?

7850 kg/m³ — the figure the weight calculators on this site use for S355JR. The value is ArcelorMittal / ASTM & EN standard references’s.

What are the mechanical properties of S355JR?

Tensile 470–630 MPa, Yield ≥ 355 MPa, Elongation min ≥ 22 % — EN 10025-2, Plate/Sections, As rolled. Those are the standard’s requirements; the mill test certificate governs the metal delivered.

What is S355JR equivalent to?

ASTM A572 Grade 50. Equivalents are approximate, never identical — compare the certificate against your specification before substituting.

S355JR — properties and composition

Designations

EN number: 1.0045
EN name: S355JR

Density

Density: 7850 kg/m³
Per: ArcelorMittal / ASTM & EN standard references
Corrosion resistance: Low
Product forms: Plate, sections

Mechanical properties

Mechanical properties
Standard	Product form	Condition / temper	Thickness	Test temperature	Yield	Tensile	Elongation min	Impact	Notes
EN 10025-2	Plate/Sections	As rolled	≤ 16 mm	20 °C	ReH ≥ 355 MPa	470–630 MPa	22 % (A% typical t<=40 mm)	27 J @ +20°C for JR	Strength changes with thickness.

Each row is one standard, one product form and one condition — the values do not transfer across rows. A blank cell means the standard sets no requirement.

Reference values from the cited standards. They describe what the standard requires, not a specific heat of material; the mill test certificate governs what is delivered.

Physical properties

Physical properties
Temperature	Density	Young’s modulus	Poisson’s ratio	Thermal expansion (20–100°C)	Thermal conductivity (20°C)	Specific heat	Electrical resistivity (20°C)	Melting range	Magnetic
20 °C	7850 kg/m³	210 GPa	0.3	12 µm/m·°C	50 W/m·K	0.47 kJ/kg·°C	0.15 µΩ·m	1425–1540 °C	Magnetic

Reference values from the cited standards. They describe what the standard requires, not a specific heat of material; the mill test certificate governs what is delivered.

Typical applications

Structural steel, machinery

Approximate equivalents

Approximate equivalents: equivalents are a technical reference, not a substitution instruction, verify against project specification.

Approximate equivalents
Grade	Systems	Relationship	Note	Key difference
ASTM A572 Grade 50	ASTM → EN	Near comparable	Similar structural strength level in many applications.	Standard requirements differ. Compared designation: S355JR.

Common questions

01What is the density of S355JR?: 7850 kg/m³ — the figure the weight calculators on this site use for S355JR. The value is ArcelorMittal / ASTM & EN standard references’s.
02What are the mechanical properties of S355JR?: Tensile 470–630 MPa, Yield ≥ 355 MPa, Elongation min ≥ 22 % — EN 10025-2, Plate/Sections, As rolled. Those are the standard’s requirements; the mill test certificate governs the metal delivered.
03What is S355JR used for?: Structural steel, machinery
04What is S355JR equivalent to?: ASTM A572 Grade 50. Equivalents are approximate, never identical — compare the certificate against your specification before substituting.