Buy 33CrMoV12-9 Nitriding Bar / 1.8522 Alloy Steel Round Bars Online At Best Price in Mumbai

Element	Weight Range (%)	Metallurgical Function
Carbon (C)	0.30 â€“ 0.38	Establishes base core strength, elastic limit, and structural hardness.
Chromium (Cr)	2.80 â€“ 3.30	Primary nitride former; builds dense surface hardness and oxidation resistance.
Molybdenum (Mo)	0.80 â€“ 1.10	Eliminates temper brittleness and maintains high-temperature creep strength.
Vanadium (V)	0.15 â€“ 0.25	Refines grain structure; forms stable secondary nitrides to resist thermal softening.
Manganese (Mn)	0.40 â€“ 0.70	Deoxidizes melt and increases through-section hardenability.
Silicon (Si)	$\le 0.40\text{ max}$	Deoxidizer during steelmaking.
Phosphorus (P)	$\le 0.020\text{ max}$	Low limit to preserve multi-axial fatigue limits.
Sulfur (S)	$\le 0.010\text{ max}$	Strict metallurgical limit for high transverse impact toughness.

Property	Core / Base Material Value (+QT State)	Post-Nitrided Surface Layer
Tensile Strength ( $R_m$ )	1000 â€“ 1200 MPa	â€”
0.2% Proof Stress ( $R_{p0.2}$ )	$\ge 800\text{ MPa}$	â€”
Elongation ( $A_5$ )	$\ge 12\%$	â€”
Impact Energy (ISO-V)	$\ge 30\text{ J}$ (at +20Â°C)	â€”
Core Hardness	295 â€“ 355 HB (~31â€“38 HRC)	â€”
Nitrided Surface Hardness	â€”	800 â€“ 950 HV1 ( $\approx 64\text{--}68\text{ HRC}$ )
Effective Case Depth	â€”	0.20 â€“ 0.60 mm (cycle-dependent)

Standard / System	Designation / Equivalent Grade
EN / DIN (Germany/Europe)	33CrMoV12-9 / 1.8522
Legacy DIN Standards	34CrMoV12 / 1.7765 (close variant)
British Standard Equivalent	~BS S132 / EN40C (approximate)
US Aerospace / Commercial	~AISI 4340Mod / AMS 6481 (comparable class)