ER312 MIG TIG Welding Wire
ER312 MIG TIG Welding Wire suppliers
ER312 MIG TIG Welding Wire factory
ER312 MIG TIG Welding Wire best

ER312 MIG TIG Welding Wire

Name: China ER312 MIG TIG Welding Wire Manufacturers, Suppliers, Factory, Company - Wholesale Products - Hangzhou Linan Dayang Welding Material Co.,Ltd.
Brand: Welding
SKU: 311357825

ER312 high crack‑resistant
29Cr‑9Ni duplex filler
Dissimilar steel welding use

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Product Introduction

Products Description

ER312 welding wire is a specialized 29Cr-9Ni duplex stainless filler metal formulated for high-risk welding scenarios. Distinct from conventional stainless welding wires, it maintains a stable 25-40% ferrite phase in weld beads, delivering exceptional solidification crack resistance. This unique property makes it the preferred filler for dissimilar steel joints, unknown-grade workpiece repair, and crack-prone tool steel welding, widely adopted in global machinery maintenance and industrial fabrication projects.

About AWS A5.9 ER312 Filler Metal

Manufactured per strict AWS A5.9 industry standards, Dayang ER312 covers full-size MIG spool and TIG rod specifications to adapt to diverse welding processes. Most generic stainless wires fail in cross-grade steel welding due to unbalanced alloy ratios and insufficient ferrite content. Our ER312 features precisely controlled Cr-Ni element proportions and stable ferrite number, effectively solving common on-site problems like weld cracking and joint brittleness during dissimilar metal connection.

With 25 years of special welding material manufacturing experience, we adopt vacuum induction melting and electroslag remelting dual processes for ER312 raw materials. The secondary purification strictly controls impurity elements such as sulfur and phosphorus, ensuring batch-to-batch consistency that low-end factory products cannot match.

Products images

Dayang ER312 MIG welding wire stainless spool AWS A5.9 ER312 TIG filler rod 2.4mm Duplex ER312 welding wire factory stock Dayang ER312 welding wire chemical test report spectro Dayang production line for ER312 stainless wire ER312 welding wire supplier

Wide Application

Tool & Die Industry: repair H13, D2, A2, S7 tool steels, die rebuilding work.
Dissimilar Metal Fabrication: carbon steel to stainless steel, low‑alloy steel to austenitic stainless steel joints.
Maintenance & Repair: unknown‑grade steels, high‑carbon steel, spring steel repair.
Cast Alloy Welding: 29Cr‑9Ni cast stainless alloy welding & overlay work.
Heavy Machinery: agricultural parts, railway component repair, buffer layer for hard‑to‑weld steels.

Why Choose Dayang Welding

Professional welding consumable manufacturer with decades of stainless & special alloy production experience, ISO certified factory.
Full‑chain production: smelting‑drawing‑spooling, no outsourcing, stable quality control.
Global service: free product samples, 24‑hour technical reply, custom spool/carton label for distributors.
Batch‑by‑batch inspection: raw material, semi‑finished and finished goods full testing before shipment.
Ready stock & flexible lead‑time, support small trial order and large‑volume bulk order for worldwide partners.

ER312 stainless wire factory China buy ER312 welding wire ER312 dissimilar metal welding AWS A5.9 ER312 ER312 MIG wire

Chemical Composition (Typical, wt.%)

Element	C	Mn	Si	Cr	Ni	P	S	Cu	Mo
AWS A5.9 Standard	≤0.15	1.0‑2.5	0.30‑0.65	28.0‑32.0	8.0‑10.5	≤0.03	≤0.03	≤0.75	≤0.75

Mechanical Properties (As‑Welded Condition)

Performance Index	Dayang Typical Value	AWS Reference
Tensile Strength	720 MPa	≥690 MPa
Yield Strength	510 MPa	‑
Elongation	25%	≥20%

FAQ

Q: What is ER312 welding wire mainly used for?

A: ER312 is designed for dissimilar metal joints, tool‑die repair, hard‑to‑weld high‑carbon steel and unknown‑grade steel welding. Not recommended for normal 304/316 identical stainless steel welding.

Q: What shielding gas for ER312 MIG / TIG?

A: TIG welding uses 100% pure argon; MIG welding adopts 98%Ar +2%O₂ mixed shielding gas.

Q: Can ER312 weld carbon steel to stainless steel?

A: Yes. It works well as transition filler for carbon‑steel‑to‑austenitic‑stainless‑steel dissimilar joints.

Q: Can Dayang offer OEM packaging for ER312?

A: Yes, custom spool, private brand label and carton printing are available for distributors.

Q: Can I get free ER312 samples?

A: We provide small free samples; buyer covers international freight; freight can be deducted for subsequent mass orders.

Q: ER312 vs ER309L, when to pick each?

A: Choose ER312 for anti‑cracking dissimilar repair work; choose ER309L for normal carbon‑to‑stainless overlay with better ductility.

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