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ER70S-A1

Tag : ER70S-A1

ER70S-A1

AWS A5.28 ER70S-A1

70S-A1 is commonly a copper coated carbon steel that contains a well balance chemistry level and 0.5% molybdenum added to

increase the strength at elevated temperatures while yielding an improved corrosion resistance. 70S-A1

has a cold cracking resistant weld deposit but will likely have reduced notch toughness. Common base metal includes ASTM 204, A213-T1, A217WC1, A182-F1

and A335-P1. Preheat and Interpass 275-325° F with Postweld heat treatment 1125-1175°F may be required.

TYPICAL WIRE CHEMISTRY (%)

-	ER70S-A1	AWS Spec
C	0.12	0.12 max.
Mn	1.3	1.30 max.
Si	0.3-0.7	0.30-0.70
P	0.025	0.025 max.
S	0.025	0.025 max.
Mo	0.4-0.65	0.40-0.65
Cu	0.35	0.5 max.

Typical mechanical properties of weld metal (C02 shielding gas)

-	ER70S-A1	AWS Spec
Yield Strength (psi)	58,000-60,000	58,000 min
Ultimate Tensile Strength (psi)	78,000-81,000	75,000 min
Elongation in 2" (%)	21	19 min
Charpy V-notch at 0 °F (ft. lbs)	-	N/A
Reduction of Area	-	N/A
Average Brinell Hardness	-	N/A