EN10028-5 P420ML1 Weldable fine-grain structural steels for pressure vessels

Posted:2015-11-30 22:58:03

EN10028-5 P420ML1 Pressure Vessel And Boiler Steel Plate are used in Pressure Vessel,Boiler,Storage Tanks and Heat Exchanger in Oil,Gas Project.

Chemical Composition of P420ML1:

Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	Al min
P420ML1	0.16	0.50	1.70	0.020	0.015	0.020
	Nb	V	Ti	Ni	Mo	N
	0.05	0.10	0.05	0.50	0.20	0.020

Mechanical Properties of P420ML1:

Grade	Thickness	Yield Strength	Tensile Strength	Elongation	Charpy V Notch Impact Test
Grade	Thickness	Yield Strength	Tensile Strength	Elongation	Degree	Min Value
P420ML1	mm	Min Mpa	Mpa	Min %	℃	J
	5≤t≤16	420	500-660	19%	-40	27
	16﹤t≤40	400	500-660	19%	-40	27
	40﹤t≤63	390	500-660	19%	-40	27

EN10028-5 P420ML1 Welding:
The fine-grain structural steel grades of this series can be perfectly welded both manually and using automatic equipment by means of all known welding processes. However, the quality of the weld joint depends on the welding process, the welding conditions and the selection of the correct filler metals. The welding wires and electrodes approved in this strength category must be used as filler metals. Basic coated elctrodes are recommended for manual welding. In general, pre-heating prior to welding or torch-cutting is not necessary. At outside temperature below +5 °C, preheating to approx. 150 °C should be carried out. Subsequent normalised or stress relief annealing with the grades rolled under normalised conditions is required only if called for in the regulations or if operating and manufacturing conditions make a reduction of the residual welding stresses appear useful. The thermo-mechanically rolled steels are not suitable for normalizing; stress relief annealing is possible. With stress relief annealing at 530–580 °C, the holding time should be 2 minutes per milimetre of plate thickness, not fall short of 30 minutes and not significantly exceed 60 minutes. Excessively high annealing temperatres or excessively long annealing times bear the risk of reducing the strength values to below the condition of delivery. In addition to this, the guidelines for processing these steel grades according to „Stahl-Eisen-Werkstoffblatt“ (Iron and steel material sheet) 088 must be observed.

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