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34CrAlNi7-10 | 1.8550 Material Datasheet

Material Test Series Values
Material Standard Values

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Material Description

Material Number	Material Name	Material Number (single)	Standard	Scope	Standard Status	Country	Predecessor	VDA 231-106 classification
1.8550 (DIN EN ISO 683-5 : 2021-08)	34CrAlNi7-10	1.8550	DIN EN ISO 683-5 : 2021-08	Supersedes DIN EN 10085 : 2001-07	Valid	Germany	34CrAlNi7-10	1.1.1	1)
1) Remark: The heat-treatable nitriding steel 34CrAlNi7-10 is applicated for machine engineering components, piston rods, plungers and spindles of particularly high dimensions. The steels contains nitriding agents (Cr and Al) which contribute by the nitriding resp. nitrocarburization process with N resp. N and C to an increase of - case hardness - wear resistance - fatigue resistance and - corrosion resistance. Application for forged components: hardened, mechanically machined and thermochemical treated (e.g. nitriding) The steel with a higher Al-content shows a tendency to increased skin decarburization. The forged part requires sufficient machining allowances so that the finished component can be supplied to the nitriding process decarburization-free.

Chemical Composition

Al [%]	C [%]	Cr [%]	Mn [%]	Mo [%]	Ni [%]	P [%]	S [%]	Si [%]	Remainder
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Material Compliance

REACh	RoHS
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Mechanical Properties

Semi-finished Product	Condition	Nominal Size [mm]	Temperature [°C]	Tensile Strength [MPa]	Yield Strength [MPa]	Elongation A [%]	Hardness HB \| HBW	Hardness HV
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Physical Properties

Temperature [°C]	Density [g/cm³]	Young's Modulus [GPa]	Mean Coefficient of Thermal Expansion (reference 20°C) [10^-6*K^-1]	Differential Coefficient of Thermal Expansion [10^-6*K^-1]	Thermal Conductivity [W/(m*K)]	Thermal Diffusivity [10^-6 m²/s]	Specific Electrical Resistance [µΩm]	Mean Specific Heat Capacity [kJ/(kg*K)]	True Specific Heat Capacity [kJ/(kg*K)]
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Toughness Data (Impact)

Condition	Nominal Size [mm]	Temperature [°C]	Specimen Shape	Specimen Direction	Notch Impact Energy [J]
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FKM Guideline Fatigue Strength

Condition	Nominal Size [mm]	Temperature [°C]	Number of Cycles	Tensile Strength [MPa]	Yield Strength [MPa]	Fatigue Limit under rev. Tension-Compression Stresses [MPa]	Fatigue Strength under pulsating Tensile Stresses [MPa]	Bending Fatigue Strength [MPa]	Shear Fatigue Strength [MPa]	Torsion Fatigue Strength [MPa]	Constant a for size factor Kd for yield stress Rp	Constant a for size factor Kd for tensile strength Rm
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Heat Treatment

Heat Treatment	Step	Temperature [°C]	Holding Time [h]	Medium
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Cross Reference

Material Name	Country	Standard
34CrAlNi7	Germany	DIN 743-3
34CrAlNi7-10	Europe	EN ISO 683-5
34CrAlNi7-10	International	ISO 683-5
A355 Class C	USA	ASTM A355	1)
Class C	USA	ASTM A355	1)
K52440	USA	UNS	1)
34CrAlNi7			1)
1) Source: Stahlschlüssel 2019, Verlag Stahlschlüssel Wegst GmbH, Marbach

Producer/Supplier/Trade names

Tradename	Supplier
PK 3	AUBERT & DUVAL Deutschland GmbH, München	1)
CR AN7	Aubert&Duval Special Steel GmbH, Mönchengladbach	1)
BGH 8550	BGH Edelstahl Siegen GmbH	1)
Nitrodur 8550	Deutsche Edelstahlwerke Specialty Steel GmbH & Co. KG, Witten	1)
Ni 50	Dörrenberg Edelstahl GmbH, Engelskirchen	1)
BÖHLER V820	voestalpine BÖHLER Edelstahl GmbH & Co.KG, Kapfenberg	1)
V820	voestalpine High Perfomance Metals Deutschland GmbH, Düsseldorf	1)
Ni 8550	W.S.M. Werkzeugstahl Handelsgesellschaft mbH & Co. KG, Meinerzhagen	1)
1) Source: Stahlschlüssel 2019, Verlag Stahlschlüssel Wegst GmbH, Marbach