Material number 1.0976: S355MC
1.0976 is the European material number (Werkstoffnummer, EN 10027-2) for S355MC, thermomechanically rolled HSLA steel for cold forming specified in EN 10149-2.
What 1.0976 means
EN 10027-2 material numbers have the form 1.XXYY: the leading 1 is steel; the next two digits give the steel group (09 → group 09); 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 1.0976 has stayed constant while the symbolic name moved from QStE380TM to S355MC.
S355MC at a glance
S355MC is the workhorse of EN 10149-2, the European standard for thermomechanically rolled high-strength steels for cold forming. The designation reads S (structural), 355 (minimum yield, MPa), M (thermomechanical rolling), C (suitable for cold forming). Werkstoff number 1.0976; the old German name QStE380TM and the SSAB trade name Domex 355 MC are still used at the shop floor.
What separates it from ordinary S355J2 is the metallurgy: carbon is held to 0.12 %, sulphur to 0.020 %, and strength comes from niobium/vanadium/titanium micro-alloying plus controlled rolling, giving a fine ferrite grain. The result is a strip that bends to 0.5 t radius in thin gauge without cracking, welds without preheat, and punches cleanly — which is why trailer chassis, truck frames, crane booms, agricultural implements and cold-formed structural profiles are made from it rather than from normalized plate.
The EN 10149-2 ladder runs S315MC → S355MC → S420MC → S460MC → S500MC → S550MC → S600MC → S650MC → S700MC (and S900/S960MC); each step raises yield and tightens the allowable bend radius. ASTM A1011 HSLAS-F Grade 50 and JIS SAPH440 are the sheet equivalents.
Full data sheet for S355MC → · Equivalent grades →