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ER90S-B9

AWS A5.28 ER90S-B9

ER90S-B9 is a 9% Cr-1% Mo wire modified with niobium (columbium) and vanadium designed to provide creep-rupture strength, toughness, fatigue life, oxidation and corrosion resistance at elevated service temperature (1040-1112°F) and high pressures (up to 4,000 psi). 

ER90S-B9, when subjected to proper welding procedures and post-weld heat treatment, yields deposits that result in a deposit structure of tempered martensite with precipitation of FeCr Carbides (M22C6) and vanadium-rich carbon-nitrides. This allows higher operating steam temperatures and pressures, and provides higher long-term creep rupture properties.

This wire is suitable for 9% Chromium steels such as P91, T91, F91 and ASTM A-213, A-335, A-387. Applications include fabrication of turbines, header systems, steam piping, electric generation, and petrochemical equipment. Controlled preheat, interpass and post heat treatment may be needed to avoid cracking.

TYPICAL WIRE CHEMISTRY (%)

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ER90S-B9

AWS Spec

C

0.09

0.07-0.13

Mn

0.54

1.20 max.

Si

0.22

0.15-0.50

P

0.008

0.010 max.

S

0.002

0.010 max.

Mo

0.90

0.85-1.20

Cr

8.90

8.00-10.50

N

0.044

0.03-0.07

Nb

0.046

0.02-0.10

V

0.22

0.15-0.30

Ni

0.46

0.80 max.

Cu

0.13

0.20 max.

Al

0.016

0.04 max.

Typical mechanical properties of weld metal (C02 shielding gas)

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ER90S-B9

AWS Spec

Yield Strength (psi)

95,500

60,000 min

Ultimate Tensile Strength (psi)

110,500

90,000 min

Elongation in 2" (%)

17.3

16 min

Charpy V-notch at -20 °F (ft. lbs)


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WA Part No.DescriptionUPC Code
TC 90S-B9 07ER90S-B9 .035 X 2 LB SPOOL034496905907
TC 90S-B9 08ER90S-B9 .035 X 11 LB SPOOL034496964195
TC 90S-B9 09ER90S-B9 .035 X 33 LB SPOOL034496905914
TC 90S-B9 15ER90S-B9 .045 X 2 LB SPOOL034496964201
TC 90S-B9 16ER90S-B9 .045 X 11 LB SPOOL034496950877
TC 90S-B9 17ER90S-B9 .045 X 33 LB SPOOL034496905921
TC 90S-B9 24ER90S-B9 1/16 X 33 LB SPOOL034496905938