20MnMoNb - NB /T 47008-2017

Grade	20MnMoNb
Corresponding Standard	NB /T 47008-2017 Carbon and Alloy Steel Forgings for Pressure Equipment
Classification	Alloy Steel

20MnMoNb Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Nb
Minimum Value	0.17	0.15	1.3	-	-	-	-	-	0.45	0.025
Maximum Value	0.23	0.4	1.6	0.025	0.01	0.3	0.3	0.2	0.65	0.05

20MnMoNb Mechanical Properties

thickness t mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
t≤300	Q+T (Tempering Temperature ≥630°C)	620~790	≥470	≥16	0°C ≥47
300<t≤500	Q+T (Tempering Temperature ≥630°C)	610~780	≥460	≥16	0°C ≥47
t≤300			≥435
			≥420
			≥405
			≥395
			≥385
			≥370
			≥355
			≥335
300<t≤500			≥430
			≥415
			≥405
			≥395
			≥385
			≥370
			≥355
			≥335

20MnMoNb Corresponding Standards(Same grade name, different standards)

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