The first two designators may be“ER”for solid wires that may be used as electrodes or rodsor they may be“EC’for composite cored or stranded wires;or they may be“EQ”for strip electrodes.
The three- or four-digit number,such as 308 in ER308,designates the nominal chemical composition of the filler metal.
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ER307.The nominal composition(wt.%)of this classification is 21 Cr.9.5Ni.4 Mn.1 Mo.Filler metals .
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ER308The nominal composition(wt.%)of this classification is 21 Cr10 Ni.Commercial specifications is most often used to weld base metals of similar composition, in particular, Type 304.
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ER308Si.This classification is the same asER308except for the higher silicon content.
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ER308H.This classification is the same as ER308.except that the allowable carbon content is used for welding 304H base metal.
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ER308L.This classification is the same as ER308,except for the carbon content.Low carbon,is less than that of the niobium-stabilized alloys or Type 308H at elevated temperatures.
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ER308LMo.This classification is used for welding ASTM CF3M stainless steel castings and matches the base metal with ER316L is desired.
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ER309.The nominal composition(wt.%)of this classification is 24 Cr13 Ni.Filler metals.
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304 and similar base metals where severe corrosion conditions exist requiring higher alloy weld metal.
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ER309Si.This classification is the same as ER309,except for higher silicon content.
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ER309L.This classification is the same as ER39,except for the carbon content.
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ER309LS.This classification is the same as ER309Lexcent for higher sillicon content.
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ER309Mo.This classification is the same as ER309except for the addition of 2.0 percent to 3.0 percent.
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ER310.The nominal composition(wt.%)of this classification is 26.5 Cr,21 Ni.Filler metal of this classification is most often used to weld base metals of similar composition
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ER312.The nominal composition(wt.%) of this classification is 30 Cr, 9 Ni.Filler metal of this classification was originally designed to weld cast alloys of similar composition.
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ER316 weld metal may occur when the following three factors co-exist:
The presence of a continuous or semicontinuous network of ferrite in the weld metal microstructurel
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ER316Si.This classification is the same as ER316,except for the higher silicon content.
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ER316H.This filler metal is the same as ER316,except that the allowable carbon .
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ER316L.This classification is the same as ER316.except for the carbon content.
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ER316LSi.This classification is the same as ER316L except for the higher silicon content.
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ER317.The nominal composition(wt.%) of this classification is 19.5 Cr14 Ni3.5 Mo, higher than ER316.
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ER317LThis classification is the same as ER317except for the carbon content.
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ER318This composition is identical to ER316,except for the addition of niobium.
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ER321Thenominal composition(wt.%)of this classification is 19.5 Cr.9.5 Niwith titanium added.The titanium acts in the same way as niobium in Type 347.
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ER347.The nominalcomposition(wt.%) of this classification is 20 Cr,10 Ni,with Nb added as a stabilizer.
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ER347Si.This classification is the same as ER347,except for the higher silicon content.
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ER409.This 12 Cr alloy(wt.%) differs from Tvpe 410 material because it has a ferritic microstructure.
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ER410.This 12 Cralloy(wt.%) is an air-hardening steel.
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ER410NiMo.The nominal composition(wt.%)of this classification is 12 Cr4.5 Ni.0.55 Mo.
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ER430.This is a 16 Cr(wt.%) alloy.The composition is balanced by providing sufficient chromium to give adequate corrosion resistance for the usual applications.
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ER439.This is an 18 Cr(wt.%) alloy that is stabilized with titanium.
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