S275JR - Hot-rolled structural steel - European Steel Business Group

Quality	Standard	Material No.	Past names
S275JR	DIN EN 10025-2	1.0044	St44-2

Quality

Testing direction	Yield strength R_eH (MPa) ≤ 16 mm	Yield strength R_eH (MPa) > 16 ≤ 40 mm	Tensile strength R_m (MPa) < 3 mm	Tensile strength R_m (MPa) ≥ 3 mm ≤ 100 mm
Transversal (≥ 600mm)	≥ 275	≥ 265	430 – 580	410 – 560

Mechanical properties at room temperature: yield strength and tensile strength

Sample direction a	Elongation A₈₀ (in %) ≤ 1 mm	A₈₀ (in %) > 1 ≤ 1,5 mm	A₈₀ (in %) > 1,5 ≤ 2 mm	A₈₀ (in %) > 2 ≤ 2,5 mm	A₈₀ (in %) > 2,5 ≤ 3 mm	A_5,65 (in %) > 3 ≤ 40 mm
l	≥ 15	≥ 16	≥ 17	≥ 18	≥ 19	≥ 23
t	≥ 13	≥ 14	≥ 15	≥ 16	≥ 17	≥ 21

Mechanical properties at room temperature: Elongation

C % ≤ 16 mm	C % >16 mm ≤ 40 mm	Si %	Mn %	P %	S %	N %	Cu %
0,21	0,21	–	≤ 1,50	≤ 0,035	≤ 0,035	≤ 0,012	≤ 0,55

Chemical composition according to melt analysis

Temperature	Minimum impact energy KV₂ (J) ≤ 150 mm
20°C	27

Impact strength KV2 on longitudinal specimens

S275JR (1.0044)

Hot-rolled structural steel S275JR (material number 1.0044) according to DIN EN 10025-2 is an unalloyed structural steel with a higher minimum yield strength compared to the S235 group. It offers a balanced ratio of strength, toughness, and cost-effectiveness and is widely used in structural steelwork and mechanical engineering. Due to its availability in various delivery conditions, S275JR can be flexibly adapted to different requirements regarding grain structure, strength, and machinability.

Material properties for construction

Mechanical specifications & delivery conditions

S275JR already offers stable mechanical properties in its standard state. Depending on the requirements for the microstructure and further processing, various delivery conditions are available:

+N (normalized rolled/normalized annealed): balanced combination of strength and toughness, good machinability

+AR (as rolled): economical standard version with standard strength values

+M (thermomechanically rolled): optimized strength/toughness profile through controlled heat-mechanical action

Impact properties

S275JR is specified with a Charpy V impact strength of at least 27 J at +20 °C. This toughness ensures reliable performance under shock loading within the typical operating temperature range and minimizes brittle failure.

Weldability

S275JR is characterized by excellent weldability. Common processes such as MAG, MIG, or manual arc welding can be used with little or no preheating (< 100 °C). The balanced microstructure in the heat-affected zone reduces the risk of cracking and enables clean, economical welds.

Areas of Application

Thanks to its increased minimum yield strength and diverse delivery conditions, S275JR is suitable for demanding constructions:

Structural engineering: Beams, columns, profiles for hall and bridge construction

Mechanical and plant engineering: machine frames, racks, pressure vessels (unless special steel qualities are required)

Bridge construction: Load-bearing bridge elements and anchorages, especially when increased strength reserves are required.

Construction industry: Composite reinforced concrete beams, stair railings with higher static load potential

General steel construction: load handling systems, platforms, cranes and crane runways

The thermomechanically rolled state (+M) also provides higher strength with good toughness, which qualifies the steel for dynamically loaded components.

Conclusion

The structural steel S275JR (1.0044) according to DIN EN 10025-2 combines an increased minimum yield strength of 275 MPa with good impact strength (27 J at +20 °C) and excellent weldability. The available conditions +N, +AR, and +M offer designers and manufacturers a wide range of mechanical properties and processing options. This makes S275JR the ideal choice for robust, economical, and load-bearing structures in steel and mechanical engineering.