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Higher-Alloy Austenitic Filler Metal
ER309 filler metal for controlled dissimilar joining and first-layer applications
ER309 is a higher-chromium and higher-nickel austenitic stainless filler classification often considered for dissimilar-metal joining and first-layer surfacing. Its higher alloy content can help accommodate dilution, but it does not remove the need to evaluate base metals, ferrite, cracking risk, service temperature and corrosion exposure.
ClassificationER309
Primary useDissimilar joining and first-layer surfacing
Supply routeSpool wire & cut rods
Request ER309 stainless steel welding wire with the required standard, dimensions, tolerance, finish, inspection and mill test certificates from SAKY METAL.
Technical procurement data
Standards, supply and inspection
ER309 Stainless Steel Welding Wire | YS309 | DIN 1.4332/1.4337 ER309 is a higher-chromium and higher-nickel austenitic stainless filler classification often considered for dissimilar-metal joining and first-layer surfacing. Its higher alloy content can help accommodate dilution, but it does not remove the need to evaluate base metals, ferrite, cracking risk, service temperature and corrosion exposure.
| Material / grade | ER309; GB/T H0Cr24Ni13; JIS YS309; DIN 1.4332 / 1.4337 |
|---|---|
| Product form | Bare solid welding wire on spool and straight cut-length filler rods by enquiry; other bare-wire packages subject to review. |
| Standards and order reference | AWS A5.9/A5.9M classification; state required revision plus project, code and WPS references. |
| Dimensions and tolerances | Specify welding process, wire or rod diameter, cut length where applicable, spool or package type and tolerance. |
| Surface and supply condition | Clean bare filler metal, securely packaged to limit handling damage and contamination; storage requirements by purchase order. |
| Inspection options | Visual and dimensional inspection, classification or chemistry review, traceability and purchaser-specific testing by agreement. |
| MTC and traceability | Certificate of conformance and heat or batch traceability; EN 10204 documentation or additional records when agreed. |
| Typical applications | Stainless-to-carbon-steel transition joints; First layer of stainless surfacing; Buffer layers before final overlay; Mixed-grade fabrication under an approved WPS |
| RFQ checklist | Grade and standard revision; base metals; process; diameter; package; quantity; WPS; testing; certificates; destination; service conditions. |
Final compliance is defined by the purchase order, approved drawing and issued mill documentation. Availability is confirmed for each grade, size and production route.
SAKY METAL reviews ER309 enquiries against the stated classification, welding process, diameter, package, base materials, WPS, service conditions, inspection scope and documentation. Availability is confirmed for each requested combination; no stock, mechanical-property or corrosion-performance claim is implied without an agreed specification.
Selection note: Identify both sides of the joint and any buttering or cladding sequence. Confirm whether ER309, ER309L, ER309LSi or another variant is required by the WPS.
Grade Designations and Cross-References
| Product designation | ER309 bare welding electrode / rod |
|---|---|
| AWS order reference | AWS A5.9/A5.9M ER309; confirm the required standard revision |
| GB/T cross-reference | H0Cr24Ni13 |
| JIS cross-reference | YS309 |
| DIN / European reference | 1.4332 / 1.4337 |
| Important | Cross-references support material review but are not blanket substitution approvals. The purchase order, applicable standard revision and qualified WPS govern acceptance. |
Supply Forms and Ordering Parameters
| GMAW / MIG | Bare solid wire on spool or basket by enquiry; specify diameter, package style and net weight. |
|---|---|
| GTAW / TIG | Straight cut-length filler rods by enquiry; specify diameter, rod length, package and identification. |
| Other processes | Submerged-arc or other bare-wire requirements are reviewed against the process, wire/flux combination and governing procedure. |
| Dimensions | Diameter and tolerance must be stated on the RFQ; availability is confirmed for the requested process and package. |
| Identification | Grade, classification, batch or heat reference, size and package identification as required by the purchase order. |
| Documentation | Certificate of conformance, chemistry or classification records and EN 10204 documents when agreed. |
Typical Application Areas
- Stainless-to-carbon-steel transition joints
- First layer of stainless surfacing
- Buffer layers before final overlay
- Mixed-grade fabrication under an approved WPS
These application areas are selection prompts rather than design approvals. Confirm filler compatibility through engineering review, the governing construction code and a qualified welding procedure.
Quality, Traceability and Welding Control
Before productionVerify grade, batch and WPS
Match package identification and certificates to the released procedure before wire enters production.
During weldingControl procedure variables
Use the qualified process, shielding system, heat-input range, interpass limit and contamination controls.
After weldingInspect to the project plan
Apply the specified visual, NDT, mechanical, chemistry or corrosion tests and retain traceability records.
Send a Complete ER309 Welding Wire RFQ
Include ER309 and the applicable standard revision, both base metals, welding process, wire or rod diameter, package or rod length, quantity, WPS or project specification, shielding requirements, inspection and certificate scope, delivery destination and relevant service conditions.
Related Welding Wire Products
- ER307 Stainless Steel Welding Wire | YS307 | DIN 1.4370
- ER308 Stainless Steel Welding Wire | YS308 | DIN 1.4316
- ER310 Heat-Resistant Stainless Steel Welding Wire | YS310 | DIN 1.4842
- ER316 Molybdenum-Bearing Stainless Steel Welding Wire | YS316 | DIN 1.4430
- ER2209 Duplex Stainless Steel Welding Wire | YS2209 | DIN 1.4462
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ER309 Welding Wire FAQs
Why is ER309 considered for dissimilar welding?
Its alloy balance is often used to accommodate dilution from unlike base metals, subject to engineering review and procedure qualification.
Is ER309 the same as ER309L?
No. The L suffix identifies a separate low-carbon classification. The required classification must be stated in full.
Can ER309 be ordered as straight filler rods?
Yes, cut-length GTAW rod requirements can be reviewed along with GMAW spool wire. Specify process, diameter, length or package and quantity.
What information controls final product acceptance?
The purchase order, cited classification and revision, approved WPS, agreed test plan, package identification and issued material documentation control acceptance.
Technical References
References define classification scope and selection context. They do not replace the project specification, current standard revision, qualified procedure or supplied certificate.