30Cr3SiNiMoVA 30Cr3 - GJB 3326A-2019

Grade	30Cr3SiNiMoVA
Other Names
Corresponding Standard	GJB 3326A-2019 Specification for ultra-high strength steel bars of aerospace solid rocket motor
Classification	Alloy Steel

30Cr3SiNiMoVA Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	V
Minimum Value	0.28	0.9	0.5	-	-	2.8	0.8	0.6	0.05
Maximum Value	0.34	1.2	0.8	0.01	0.01	3.2	1.2	0.8	0.15

30Cr3SiNiMoVA Mechanical Properties

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 %	Impact Energy Absorption KV2 J
Quench: 910~930°C for 1h, oil cool temper: 250±10°C for 3h~5h, air cool	≥1715	≥1370	≥9	≥40	KU2: ≥47 Kic: ≥100MPa•√m

Kic- fracture toughness

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