Q420R - GB /T 713.2-2023

Grade	Q420R
Corresponding Standard	GB /T 713.2-2023 Steel Plate, Sheet and Strip for Pressure Equipments - Part 2: Non-Alloy And Alloy Steel with Specified Temperature Properties
Classification	Alloy Steel

Q420R Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N	Ti	V	Nb	More
Minimum Value	-	-	1.2	-	-	-	0.2	-	-	-	-	-	0.015	Nb+V+Ti≤0.22；Cu+Cr+Mo≤0.45
Maximum Value	0.2	0.55	1.6	0.02	0.01	0.3	0.5	0.3	0.08	0.02	0.03	0.1	0.05	Nb+V+Ti≤0.22；Cu+Cr+Mo≤0.45

Q420R 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
6≤t≤20	Normalizing or Normalizing + Tempering	590~720	≥420	≥18	-20°C ≥60
60＜t≤100	Normalizing or Normalizing + Tempering	510~610	≥330	≥20	-20°C ≥47

Approximate Comparison Table Steel Plate for Boilers and Pressure Vessels

China	United States	International Organization for Standardization	European Standard
GB	ASTM	ISO	EN
Q420R GB/T 713.2-2023	SA612 SA737 ASME Ⅱ-A-2021	P420NH P420NL1 ISO 9328-2018	P420NH P420NL1 EN 10028-2017

Q420R Corresponding Standards(Same grade name, different standards)

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