20 - NB /T 47008-2017

Grade	20
Corresponding Standard	NB /T 47008-2017 Carbon and alloy steel forgings for pressure equipment
Classification	Carbon Steel

20 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.17	0.15	0.6	-	-	-	-	-
Maximum Value	0.23	0.4	1	0.025	0.01	0.25	0.3	0.2

20 Mechanical Properties

thickness t mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW	Impact Energy Absorption KV2 J
t≤100	N or N+T (tempering temperature ≥620°C)	410~560	≥235	≥24	* 110~160	0°C ≥34
100<t≤200	N or N+T (tempering temperature ≥620°C)	400~550	≥225	≥24	* 110~160	0°C ≥34
200<t≤300	N or N+T (tempering temperature ≥620°C)	380~530	≥205	≥24	* 110~160	0°C ≥34
t≤100			≥210
			≥200
			≥186
			≥167
			≥153
			≥139
			≥129
			≥121
100<t≤200			≥200
			≥191
			≥178
			≥161
			≥147
			≥133
			≥123
			≥116
200<t≤300			≥184
			≥176
			≥164
			≥147
			≥135
			≥123
			≥113
			≥106

20 Corresponding Standards(Same grade name, different standards)

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