17CrNiMo6/18CrNiMo7-6 alloy steel-Zhangjiagang Maiterio Intelligent Equipment Company

Benefits

Benefits:
Excellent Surface Hardness: Achievable up to 60–62 HRC after carburizing and quenching, ideal for wear-resistant parts.
High Core Toughness: Maintains strong mechanical performance in the core after case hardening.
Outstanding Fatigue and Impact Resistance: Reliable performance in dynamic, high-load applications.
Good Machinability: Easily machinable before heat treatment and carburizing.
Deep Case Depth Capability: Ensures durable wear layers for long service life in gear teeth and contact zones.

Heat Treatment

Heat Treatment	Temperature	Medium	Purpose
Carburizing	880–950°C	Carbon-rich atmosphere (Industry Standards)	To introduce carbon into the surface
Hardening (After Carburizing)	820–860°C	Oil or gas quenching	To achieve high surface hardness (Industry Standards)
Tempering	150–200°C	Air cooling (Industry Standards)	To reduce internal stress and improve toughness
Core Refinement (Optional)	830–880°C (Industry Standards)	Air or oil quenching (Industry Standards)	To refine the core microstructure

Applications

Applications:
Heavy-duty gears and gear shafts
Transmission components
Railway drive systems
Crankshafts and camshafts
Wind turbine gearbox parts

Availability

Availability:
Available in Forged Bars / Round Bars / Billets / Custom Forgings / Heat-Treated Blanks.

Parameter

18CRNIMO7-6

18CRNIMO7-6/17CrNiMo6			Products standard		DIN 17210/EN 10084
Chemical Composition(%)		C	Si	Mn	P	S	Cr	Ni	Mo
		0.15-0.21	0.15-0.35	0.40-0.70	≤0.035	≤0.035	1.50-1.80	1.40-1.70	0.25-0.35
Steelmaking Processes	BOF /EAF + secondary refining(LF/RH), continuous casting
Mechanical Properties (Q + T)	Tensile /MPa		yield /MPa		Elongation/%	Reduction of Area /%		Impact Energy /J
	≥1000		≥800		≥10	≥40		≥35
Hardness Range/HB (Solution Hardening)	Normalization/HB				Quenching+Tempering/HB
	180-220				Usually Carburizing
Heat Treatment	Normalizing: 880-950 °C (improves toughness and uniformity of the material) Q+T (Quenching + Tempering): For higher strength and toughness (quenched at 850-880℃, tempered at 550-700 °C for enhanced mechanical properties) Annealing: For softening the material and improving machinability Other options: Stress relieving (typically around 600-650 ℃)

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17CrNiMo6/18CrNiMo7-6 alloy steel

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