ER90S-B9 MIG & TIG Welding Wire

At Metals And Welding Specialities, we supply premium-grade ER90S-B9 MIG & TIG Welding Wire, engineered for superior performance in high-temperature and high-pressure environments. Classified under UNS K91560 and conforming to ASTM A5.28 ER90S-B9, this alloy is designed for joining 9Cr-1Mo-V steel and similar chromium-molybdenum materials used in power generation, petrochemical, and refinery applications. It offers outstanding creep strength, oxidation resistance, and stability, making it an excellent choice for critical service welds that demand durability and metallurgical integrity.

The ER90S-B9 filler metal contains controlled additions of vanadium and niobium, which refine grain structure and enhance toughness at elevated temperatures. Its balanced composition ensures consistent arc stability and smooth bead appearance, whether used with MIG (GMAW) or TIG (GTAW) processes. When applied with proper heat treatment, the resulting weld metal exhibits excellent mechanical properties, maintaining strength and resistance to cracking under long-term exposure to service temperatures up to 650°C (1200°F).

Welders and engineers trust this alloy for its proven reliability in constructing and repairing components such as boiler tubes, steam headers, heat exchangers, and piping systems that must withstand severe thermal cycling. The AWS ER90S-B9 wire also provides clean weld deposits with minimal spatter and optimal wetting characteristics, ensuring efficient workflow and reduced post-weld finishing time. Its controlled carbon and alloying elements deliver a fine balance between hardness and ductility, preventing embrittlement while preserving long-term creep performance.

At Metals And Welding Specialities, quality and precision define every spool we supply. Our ER90S-B9 welding wire meets or exceeds industry standards for weld consistency and mechanical strength. Each batch is rigorously tested for chemistry, cleanliness, and wire feedability, ensuring that fabricators receive a product capable of meeting the toughest ASME and ASTM project specifications. With precise diameter tolerances and excellent arc characteristics, this filler metal supports uniform weld penetration and high-quality fusion even in complex multi-pass joints.

Whether you’re performing fabrication, repair, or maintenance in refineries, chemical plants, or power stations, Metals And Welding Specialities ER90S-B9 wire delivers the metallurgical integrity your applications demand. Designed for critical high-temperature service environments, it remains the go-to filler metal for professionals seeking long-lasting, dependable performance under stress.

• Specification ER90S-B9 MIG & TIG Welding Wire

  Classification	AWS A5.28, ER90S-B9
  Form	MIG spools, TIG cut lengths, Reels and Coils
  Type Of Welding	Inert Gas Welding
  Standard TIG straight lengths are available	36” (914 mm) or 39” (1000 mm) lengths. Other lengths available upon request.
  AWS ER90S-B9 MIG & TIG Filler Metal Application & uses	Hardware tools Metallurgy Machinery Construction Shipbuilding Petroleum Chemical plant Power sector Gas Industry

• Equivalent Grade Of ER90S-B9 MIG & TIG Welding Wire

  Class	UNS	Oxford Alloys	BOHLER
  ER90S-B9	S50482	Alloy 90S-B9	UNION ER90S-B9

• ER90S-B9 MIG & TIG Welding Wire Chemical Composition

  C	Mn	Si	S	Ni	Cr	Mo	V	Al	Cu	Nb	N
  .09	.59	.20	.002	.63	8.93	.87	.21	.006	.05	.07	.045

• ER90S-B9 MIG & TIG Welding Wire Parameters

  PROCESS	DIA. OF WIRE		AMPERAGE	VOLTAGE	GAS/FLUX
  	1/16”		50-120	7-13	Ar
  GTAW (TIG)	3/32”		120-200	10-16	Ar
  	1/8”		150-220	12-18	Ar
  GMAW (MIG) SHORT ARC	.035” .045” 1/16”		90-160 120-200 -	14-20 16-20 -	CO2 CO2 -
  GMAW (MIG) SPRAY	.035” .045” 1/16”		180-230 250-350 280-400	25-28 25-30 26-36	Ar / CO2 Ar / CO2 Ar / CO2
  SUBMERGED	3/32”		250-340	26-34	MARATHON 543
  ARC	1/8”		350-480	26-34	MARATHON 543
  Travel Speed – 8-15 IPM		Stickout – ¾” Avg.

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