Stainless Steel E347
EN E347 · UNS W34710
E347 is a niobium-stabilized 304-type covered electrode (UNS W34710, AWS A5.4 family, supplied as E347-15, -16, -17 and -26 coatings) whose deposit resists intergranular corrosion after high-temperature exposure.
Reference datasheet — E347 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AW condition
E347 tempers and conditions
E347 is supplied in 6 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
stabilization anneal 870–900 °C, air cool | Apply when maximum intergranular-corrosion immunity is required in severe nitric-acid or long-term high-temperature service. | 360 | 560 | 42 | 165 HB | 2.4 % IACS |
Lime (basic) coating, DCEP only | Pick for maximum weld-metal toughness and lowest hydrogen/impurity level, all-position DC work. | 415 | 590 | 40 | 175 HB | 2.4 % IACS |
High-recovery (iron-powder) coating, flat/horizontal | Use for high deposition rate on flat and horizontal fillet welds where positional welding is not needed. | 415 | 595 | 35 | 185 HB | 2.4 % IACS |
AWDefault As-welded deposit | Default condition for E347 deposits: use as-deposited for most piping and vessel work. | 420 | 600 | 37 | 180 HB | 2.4 % IACS |
Lime-titania coating, AC or DCEP | The most widely stocked E347 electrode: smooth arc, easy slag release, AC-capable. | 420 | 600 | 37 | 180 HB | 2.4 % IACS |
Silica-titania (acid-rutile) coating, AC or DCEP | Choose for the flattest, best-wetting bead appearance on fillet and horizontal welds. | 425 | 605 | 36 | 185 HB | 2.4 % IACS |
What is E347?
E347 is a niobium-stabilized 304-type covered electrode (UNS W34710, AWS A5.4 family, supplied as E347-15, -16, -17 and -26 coatings) whose deposit resists intergranular corrosion after high-temperature exposure. Engineers specify it for stabilized stainless piping and vessels; as-welded deposit typically shows 420 MPa yield, 600 MPa tensile, 37 % elongation and about 180 HB (89 HRB), with service to 800 C. It is a filler metal only, and ferrite must be held near 4-10 FN to avoid hot cracking. Where stabilization against sensitization is not required, E308L is the lower-cost alternative. E347 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F). E347 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 37% and the elastic modulus is 195 GPa (28.3 Msi).
What is E347 used for?
- petrochemical piping
- nuclear-grade fabrication
- stabilized stainless pressure vessels
Advantages
- Readily welded — 88/100, better than 91% of stainless steel grades
E347 properties
Typical room-temperature values for E347-AW; bars are the position among stainless steel grades.
Physical3
E347 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
E347 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 37% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
E347 is rated for continuous service to 800°C (1,472 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), better than 58% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
E347 conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 63% of stainless steel grades.
Sustainability4
Producing a kilogram of E347 takes about 55 MJ of energy and emits 5.3 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 50%.
Manufacturability7
E347's machinability is fair (38/100, better than 63% of stainless steel grades); weldability excellent (88/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. E347 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E347
Is E347 easy to machine?
Deposit machines like 347: low speeds, heavy positive-rake carbide tooling, rigid setup and flood coolant to fight work hardening; grind out slag inclusions before finish cuts.
Can E347 be welded?
SMAW with short arc, low heat input and interpass temperature below ~150 °C; redry electrodes (250–300 °C for basic types) and keep ferrite about 4–10 FN to avoid hot cracking.
Can E347 be formed, bent or molded?
Not a forming product — the deposit is ductile (>30 % elongation) but weld caps should be dressed before any cold bending of the joint.
E347 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CAWS A5.4 undiluted weld metal | ≤ 0.08 | 0.05 |
| Cr | 18 – 21 | 19.5 |
| Ni | 9 – 11 | 10 |
| Mn | 0.5 – 2.5 | 1.5 |
| Si | ≤ 0.9 | 0.6 |
| Nb+Ta8×C minimum, 1.00 max | 0.4 – 1 | 0.6 |
| Moresidual | ≤ 0.75 | 0.1 |
| Curesidual | ≤ 0.75 | 0.1 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance |
What surface finishes work on E347?
Remove all slag, then pickle and passivate or electropolish; never use carbon-steel brushes or grinding media that would embed iron and cause rust staining.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel E347 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W34710
- Also called
- AWS A5.4 E347
How much does E347 cost?
E347 is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
E347 — frequently asked
What is E347 used for?
E347 is typically used for petrochemical piping, nuclear-grade fabrication and stabilized stainless pressure vessels. In short: stabilized against sensitization; matches 321/347 piping; service to 800 C.
What is the yield strength of E347?
E347 has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is E347 easy to machine?
Not especially — machinability is rated fair (38/100, better than 63% of stainless steel grades). Deposit machines like 347: low speeds, heavy positive-rake carbide tooling, rigid setup and flood coolant to fight work hardening; grind out slag inclusions before finish cuts.
Can E347 be welded?
Yes — weldability is rated excellent (88/100). SMAW with short arc, low heat input and interpass temperature below ~150 °C; redry electrodes (250–300 °C for basic types) and keep ferrite about 4–10 FN to avoid hot cracking.
What surface finishes work on E347?
Remove all slag, then pickle and passivate or electropolish; never use carbon-steel brushes or grinding media that would embed iron and cause rust staining.
Can E347 be formed, bent or molded?
Not a forming product — the deposit is ductile (>30 % elongation) but weld caps should be dressed before any cold bending of the joint.
What is the maximum service temperature of E347?
E347 is rated for continuous use to about 800°C (1,472 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E347-AW and E347-15?
AW is the default condition — default condition for E347 deposits: use as-deposited for most piping and vessel work. E347-15: pick for maximum weld-metal toughness and lowest hydrogen/impurity level, all-position DC work. Yield strength is 420 MPa in AW versus 415 MPa in E347-15.
How much does E347 cost?
E347 is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AWS A5.4/A5.4M Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding — American Welding Society (2012)
- GB/T 983 (A132 / A137) — SAC (2012)
- ASM Handbook Vol.6, Welding, Brazing and Soldering — Austenitic Stainless Steel Weld Metal — ASM International (1993)
- ASM Handbook Vol.1 — Properties of AISI 347/321 Stainless Steel — ASM International (1990)
- Stainless SMAW electrode all-weld-metal data (ESAB / Lincoln Electric / Böhler Welding) — Various consumable producers (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.