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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 (%)

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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)

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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