Q420DR - GB /T 713.3-2023

Grade	Q420DR
Corresponding Standard	GB /T 713.3-2023 Steel Plate, Sheet and Strip for Pressure Equipments— Part 3: Low Alloy Steel with Specified Low Temperature Properties
Classification	Alloy Steel

Q420DR Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Ni	Mo	N	V	Nb
Minimum Value	-	0.15	1.3	-	-	0.3	-	-	0.05	0.015
Maximum Value	0.2	0.5	1.7	0.018	0.008	0.8	0.08	0.02	0.15	0.05

• When acid-soluble aluminium (Als) is used instead of Alt, the Als content should be no less than 0.015%. When the Nb+V+Ti content in steel is ≥0.015%, the Al content is not required.

Q420DR Mechanical Properties

thickness t mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
6≤t≤20	Normalizing or normalizing + tempering	590~720	ReL ≥420	≥19	-40°C ≥60
20＜t≤30	Normalizing or normalizing + tempering	570~700	ReL ≥400	≥19	-40°C ≥60

• When the yield phenomenon is not obvious, the specified plastic extension strength Rp0.2 is adopted.

Approximate Comparison Table Pressure-Bearing Flat Steel

China	European Standard
GB	EN
Q420DR GB/T 713.3-2023	P420NL1 EN 10028-3-2017

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!