30MnB5

1.5531

alloy_steelquenched_tempered

Boron-alloyed QT steel — between 22MnB5 (press hardening, UTS ~1500 MPa) and 38MnB5 (UTS ~1800 MPa) in the B-steel range. C 0.27-0.33%. Used for high-strength fasteners (class 10.9), chain links, agricultural machinery, and some press-hardened components. Good cold formability before heat treatment.

Mechanical properties

Property	Value	Unit
tensile_strength	900–1100	MPa
yield_strength	650–850	MPa
elongation	10–14	%
e_modulus	≥ 210	GPa
density	≥ 7.85	g/cm3

Related materials

42CrMo4

1.7225

cr_mo

High-strength quenched and tempered chromium-molybdenum steel. Widely used for shafts, gears, crankshafts, connecting rods, and high-strength bolts. Excellent hardenability and good fatigue resistance.

🇪🇺 42CrMo4🇫🇷 42CD4🇬🇧 708M40 / EN19🇯🇵 SCM440

34CrNiMo6

1.6582

cr_ni_mo

High-strength quenched and tempered Cr-Ni-Mo steel. Excellent hardenability and toughness, suitable for large cross-sections. Used for heavy-duty shafts, gears, turbine parts, and aerospace components.

🇪🇺 34CrNiMo6🇨🇳 34CrNiMo6🇬🇧 817M40 / EN24🇯🇵 SNCM439

16MnCr5

1.7131

case_hardening

Low-carbon case-hardening steel with manganese and chromium. Excellent for carburizing to produce a hard, wear-resistant surface with a tough core. Standard choice for gears, camshafts, piston pins, and transmission components.

🇪🇺 16MnCr5🇫🇷 16MC5🇨🇳 16MnCr5🇯🇵 SCr415

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