Material number 1.0044: S275JR
1.0044 is the European material number (Werkstoffnummer, EN 10027-2) for S275JR, non-alloy hot-rolled structural steel specified in EN 10025-2.
What 1.0044 means
EN 10027-2 material numbers have the form 1.XXYY: the leading 1 is steel; the next two digits give the steel group (00 → base steels); the last two digits are a sequential number within that group. The number is unique to one composition and survives name changes, which is why 1.0044 has stayed constant while the symbolic name moved from St44-2 to S275JR.
S275JR at a glance
S275JR sits between S235JR and S355 in the EN 10025-2 family: a non-alloy structural steel with 275 MPa minimum yield up to 16 mm and a tensile range of 410–560 MPa, impact tested to 27 J at +20 °C. Its Werkstoff number is 1.0044.
In practice S275JR is the British and Irish default for hot-rolled sections (the successor to BS 4360 43A/43B), while continental Europe tends to jump from S235 directly to S355. Buyers see it most in universal beams and columns, angles, flats and hollow sections. Carbon is allowed up to 0.21 % and CEV up to 0.40 %, so preheat is still unnecessary in ordinary thicknesses.
When a drawing says St44-2 or Fe430B, S275JR is the grade to order; when it says A36, check the design — A36 yield is 250 MPa, so S275JR is the safe upward substitute but A36 is not a downward one.
Full data sheet for S275JR → · Equivalent grades →