6Cr4W3Mo2VNb T26410 - GB /T 1299-2025

6Cr4W3Mo2VNb Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Cu	Mo	W	V	Nb	More
Minimum Value	0.6	-	-	-	-	3.8	-	1.8	2.5	0.8	0.2	Cu+Ni≤0.55
Maximum Value	0.7	0.4	0.4	0.03	0.015	4.4	0.25	2.5	3.5	1.2	0.35	Cu+Ni≤0.55

6Cr4W3Mo2VNb Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
Delivery condition	Annealing	≤255
Specimen	Quenching at 1100-1160℃, oil cooling	HRC: ≥60

New and Old Grade Replacement List

Corresponding Standard	Grade
GB /T 1299-2014	Grade China ISC Other Name Other Name
GB /T 1299-2025	Grade China ISC

6Cr4W3Mo2VNb Corresponding Standards(Same grade name, different standards)

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