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.

• ER307.The nominal composition(wt.%)of this classification is 21 Cr.9.5Ni.4 Mn.1 Mo.Filler metals .

• 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.

• ER308Si.This classification is the same asER308except for the higher silicon content.

• ER308H.This classification is the same as ER308.except that the allowable carbon content is used for welding 304H base metal.

• 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.

• ER308LMo.This classification is used for welding ASTM CF3M stainless steel castings and matches the base metal with ER316L is desired.

• ER309.The nominal composition(wt.%)of this classification is 24 Cr13 Ni.Filler metals.

• 304 and similar base metals where severe corrosion conditions exist requiring higher alloy weld metal.

• ER309Si.This classification is the same as ER309,except for higher silicon content.

• ER309L.This classification is the same as ER39,except for the carbon content.

• ER309LS.This classification is the same as ER309Lexcent for higher sillicon content. 

• ER309Mo.This classification is the same as ER309except for the addition of 2.0 percent to 3.0 percent.

• 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

• 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.

• 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

• ER316Si.This classification is the same as ER316,except for the higher silicon content.

• ER316H.This filler metal is the same as ER316,except that the allowable carbon .

• ER316L.This classification is the same as ER316.except for the carbon content.

• ER316LSi.This classification is the same as ER316L except for the higher silicon content.

• ER317.The nominal composition(wt.%) of this classification is 19.5 Cr14 Ni3.5 Mo,  higher than ER316.

• ER317LThis classification is the same as ER317except for the carbon content.

• ER318This composition is identical to ER316,except for the addition of niobium.

• 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.

• ER347.The nominalcomposition(wt.%) of this classification is 20 Cr,10 Ni,with Nb added as a stabilizer. 

• ER347Si.This classification is the same as ER347,except for the higher silicon content.

• ER409.This 12 Cr alloy(wt.%) differs from Tvpe 410 material because it has a ferritic microstructure.

• ER410.This 12 Cralloy(wt.%) is an air-hardening steel.

• ER410NiMo.The nominal composition(wt.%)of this classification is 12 Cr4.5 Ni.0.55 Mo.

• 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.

• ER439.This is an 18 Cr(wt.%) alloy that is stabilized with titanium. 

ER304,ER307Si,ER308,ER308L,ER308LSi,ER309,ER309L,ER309LSi,ER310,ER316,ER316L,ER316LSi,ER321,ER347,ER410,

ER430,ER2209,317l