Products
ER309
AWS:
AWS A5.9
Category:
Description
Chemical components
| C | Mn | Si | S | P | Cr | Ni | Mo | Cu | N | Nb |
| 0.12 | 1.0-2.5 | 0.30-0.65 | 0.03 | 0.03 | 23.0-25.0 | 12.0-14.0 | 0.75 | 0.75 | —— | —— |
Product Description
ER309 is a high-alloy austenitic stainless steel filler metal compliant with AWS A5.9/A5.9M standards, designed for welding dissimilar metals such as joining 300-series stainless steels to carbon steel or low-alloy steels. Featuring an elevated alloy composition with 23.0-25.0wt.% chromium and 12.0-14.0wt.% nickel, it provides excellent high-temperature strength and corrosion resistance. Compatible with GMAW (MIG), GTAW (TIG), and SAW processes using appropriate shielding gases, it supports welding of similar 309 alloys, dissimilar joints, and overlay applications where high alloy content is required.
Features
▪ Superior Dissimilar Welding: High chromium and nickel content (23-25% Cr, 12-14% Ni) provides excellent dilution tolerance when welding stainless steels to carbon or low-alloy steels. The balanced austenitic-ferritic structure (typically 8-14% FN) offers high resistance to hot cracking and solidification defects in complex dissimilar joints.
▪ High-Temperature Performance: Designed for applications requiring strength at elevated temperatures up to 1000°C (1832°F), with typical tensile strength of 550-600 MPa and yield strength of 350-410 MPa. The elevated alloy content provides excellent resistance to oxidation, scaling, and thermal fatigue in heat exchangers, boiler parts, and furnace components.
▪ Stable Performance: Austenitic structure with typical elongation of 40-47% provides excellent ductility and toughness. The controlled ferrite content (8-14 FN) ensures good weldability and resistance to cracking. Available in spooled wire (0.8-2.0mm) for MIG/SAW and cut lengths (1.6-5.0mm) for TIG welding, offering versatile application options.
Applications
▪ Ideal for dissimilar metal welding and high-temperature applications, ER309 is widely used in:
▪ Dissimilar Metal Joining: Welding 300-series stainless steels (such as 304, 316) to carbon steel, low-alloy steel, or cast iron. Also used for welding straight chromium steels (such as 13Cr or 18Cr) to stainless steels.
▪ High-Temperature Equipment: Heat exchangers, furnace components, annealing boxes, boiler parts, and radiant tubes exposed to elevated temperatures and oxidizing atmospheres.
▪ Cladding & Overlay Applications: Cladding carbon steel or low-alloy steel vessels and pipes with stainless steel overlay to enhance corrosion resistance. Used as a barrier layer in multi-layer overlays.
▪ Chemical & Petrochemical: Process equipment, reactors, and piping where dissimilar metal joints are required or enhanced corrosion resistance is needed on carbon steel substrates.
Company Introduction
Hangzhou Lin'an Dayang Welding Materials Co., Ltd., a professional welding materials manufacturer founded in 1995, adheres to the core philosophy of "Innovative R&D, Precision Manufacturing, Meticulous Service".
With over 30 years of industry expertise, we have continuously increased investment in production upgrading and technological R&D, solidifying our reputation as a trusted supplier of industrial welding consumables globally.
Production Capacity & Product Strength
Equipped with multiple advanced automated production lines, we boast an annual output of 5,000 tons of premium welding products.
Our core portfolio covers nickel-based welding wires, stainless steel welding wires, flux-cored welding wires and high-performance specialty electrodes.
Backed by a professional R&D team with multiple patents, we also provide tailored OEM/ODM welding solutions to meet clients’ diverse application needs.
After-sales service process
FAQS
What is ER309 primarily used for?
ER309 is primarily used for welding dissimilar metals, such as joining 300-series stainless steels to carbon steel or low-alloy steels, and for high-temperature applications requiring elevated chromium and nickel content for oxidation resistance.
What is the difference between ER309 and ER309L?
ER309 has a maximum carbon content of 0.12%, while ER309L has ultra-low carbon (≤0.03%) for enhanced intergranular corrosion resistance. ER309 provides higher strength at elevated temperatures, while ER309L offers superior corrosion resistance in harsh environments.
Can ER309 be used for overlay applications?
Yes, ER309 is commonly used for cladding carbon steel or low-alloy steel substrates with stainless steel overlay to enhance corrosion resistance. It is also used as a barrier layer in multi-layer overlays before applying more corrosion-resistant top layers.
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