25 - NB /T 47008-2017

Grade	25
Corresponding Standard	NB /T 47008-2017 Carbon and alloy steel forgings for pressure equipment
Classification	Carbon Steel

25 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.22	0.17	0.5	-	-	-	-	-
Maximum Value	0.29	0.37	0.8	0.03	0.02	0.25	0.3	0.25

25 Mechanical Properties

thickness t mm	Test Temperature	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	Room Temperature	N or N+T	420~570	≥235	≥20	120~170	20°C ≥31
100<t≤300	Room Temperature	N or N+T	390~540	≥215	≥20	120~170	20°C ≥31

25 Corresponding Standards(Same grade name, different standards)

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