X90CrMoV18

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Chemical composition % of steel (X90CrMoV18): EN 10088-3-2005

C	Si	Mn	P	S	Cr	Mo	V
0.85 - 0.95	max 1	max 1	max 0.04	max 0.03	17 - 19	0.9 - 1.3	0.07 - 0.12

Mechanical properties of steel (X90CrMoV18)

Brinell hardness (HB): (+A)

265

Principal Design Features This is a high carbon martensitic stainless with moderate corrosion resistance good strength and the ability to obtain and keep excellent hardness (Rc 58) and wear resistance.

Applications Ball bearings and races, gage blocks, molds and dies, cutlery, valve components, knives and measuring instruments.

Machinability Best machined in the annealed condition. Tough, stringy chips can be best handled by the use of chip breakers. Carbide or ceramic tooling is recommended.

Welding This alloy is not commonly welded due to its tendency to air harden. If it must be welded, preheat to 500 F (260 C) and post weld treat at 1350-1400 F (732-760 C) for 6 hours followed by a slow furnace cooling to avoid cracking. Use similar filler metal and high heat inputs during operations.

Hot Working Pre-heat to 1400 F (760 C), then bring slowly up to 1900-2200 F (1038-1204 C)before proceeding. Do not work this material below 1700 F (927 C). Cool material slowly after working and once at room temperature, anneal fully.

Cold Working This alloy is considered only slightly cold workable by common practices.

Annealing 1550-1600 F (843-871 C), followed by very slow furnace cooling.

Tempering For maximum properties, soak at 300 F (148 C). Maximum obtainable hardness is RC 58.

Hardening Bring the material slowly up to 1400 F (760 C), then on to a soak temperature of 1850 F (1010 C), air or oil cool.