00Ni18Co8Mo5TiAl C250 18Ni-250 - GJB 10310-2021

Grade	00Ni18Co8Mo5TiAl
Other Names
Corresponding Standard	GJB 10310-2021 Specification for Ultra-high Strength Maraging Steel Forgings
Classification	Special Alloy Steel

00Ni18Co8Mo5TiAl Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Ti	Co	Al
Minimum Value	-	-	-	-	-	-	17	-	4.6	0.3	7.5	0.05
Maximum Value	0.02	0.1	0.1	0.008	0.006	0.5	19	0.5	5.2	0.5	8.5	0.15

The addition of calcium (Ca) may be permitted, provided that the total content does not exceed 0.05%.

00Ni18Co8Mo5TiAl Mechanical Properties

Sampling direction	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
Longitudinal / Transverse	Solution treatment: 820°C ± 10°C, 1 hour, air cooling to room temperature; Aging treatment: 480°C ± 5°C, 3 to 6 hours, air cooling to room temperature.	≥1758	≥1724	long.：≥6 tr.：≥4	long.：≥45 tr.：≥35	HRC: ≥48 ①

① When tensile properties meet the requirements, hardness may not be used as an acceptance criterion; only measured values shall be provided.

* hen transverse property requirements are not specified in the drawings or contract, only longitudinal mechanical properties need to be determined.

00Ni18Co8Mo5TiAl Corresponding Standards(Same grade name, different standards)

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