Harris Products Group, 90SB3F8, Welding Alloy, Low Alloy Steel, GMAW, Chromium-Molybdenum, 2-1/4% Cr; 1% Mo

ER90S-B3 low alloy steel MIG (GMAW) for welding 2-1/4 in. chromium-molybdenum steels used in high-pressure piping and pressure vessels. Also, used for joining dissimilar combinations of chromium-molybdenum and carbon steels. Conforms to AWS 5.28, ER90S-B3.

Features

• Welds 2-1/4% chromium/1% molybdenum steel alloys
• Conforms to AISI/AWS A5.28 & ASME SFA 5.28 ER 90S-B3
• Often used in high temperature and high-pressure piping vessels
• Use with pre-heat and inter-pass temperature of 375◦F min. (191◦C min.)
• Joining carbon steels to chromium-molybdenum steels
• Control pre-heat, inter-pass and post heat to avoid cracking
• General purpose MIG (GMAW) welding wire for chromium and molybdenum low-alloy steel

• Tensile Strength: 94,000 psi
• Yield Strength: 80,500 psi
• Elongation: 19% in 2 in
• Recommended Wire Diameter Range (GMAW Spray Transfer): .030 to 3/32 in
• Recommended Amperage Range (GMAW Spray Transfer): 135 to 600 amps
• Recommended Voltage Range (GMAW Spray Transfer): 24 to 33 volts
• Shielding Gas (GMAW Spray Transfer): Argon/2% O2
• Recommended Wire Feed Speed (GMAW Spray Transfer): 75 to 670 in/min
• Recommended Wire Diameter Range (GMAW Short-Circuiting): .023 to .045 in
• Recommended Amperage Range (GMAW Short-Circuiting): 30 to 600 amps
• Recommended Voltage Range (GMAW Short-Circuiting): 14 to 33 volts
• Shielding Gas (GMAW Short-Circuiting): CO2 or Ar-CO2 mixture
• Recommended Wire Feed Speed (GMAW Short-Circuiting): 75 to 400 in/min
• Preheat Temperature: 375 F (191 C) minimum
• Post Weld Heat Treatment: 1250 to 1300 F for 1 hour
• Weight: 1.16 lbs
• Material: Low alloy steel, 2.25% Chromium, 1% Molybdenum
• Chemical Composition Carbon: 0.07-0.12%
• Chemical Composition Chromium: 2.30-2.70%
• Chemical Composition Molybdenum: 0.90-1.20%
• Chemical Composition Copper: 0.50% max
• Chemical Composition Iron: Balance
• Chemical Composition Manganese: 0.40-0.70%
• Chemical Composition Nickel: 0.20% max
• Chemical Composition Phosphorus: 0.025% max
• Chemical Composition Silicon: 0.40-0.70%
• Chemical Composition Sulfur: 0.025% max
• Compliance: AISI/AWS A5.28, ASME SFA 5.28 ER 90S-B3

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