Stainless Steel E347 PWHT-STAB
Heat-treated state
EN E347 · UNS W34710
Apply when maximum intergranular-corrosion immunity is required in severe nitric-acid or long-term high-temperature service.
Values for the PWHT-STAB condition
Other E347 tempers and conditions
E347 is listed in 6 conditions; see the grade overview at E347.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHT-STABThis page 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 PWHT-STAB?
E347 PWHT-STAB is E347 heat treated to PWHT-STAB — apply when maximum intergranular-corrosion immunity is required in severe nitric-acid or long-term high-temperature service. E347 PWHT-STAB has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 51% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 193 GPa (28 Msi). E347 PWHT-STAB 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). AW is the default condition FabDigit quotes; PWHT-STAB is available on request or by drawing note.
Advantages
- Readily welded — 88/100, better than 91% of stainless steel grades
E347 PWHT-STAB properties
Typical room-temperature values for E347 PWHT-STAB; 22 are specific to this condition. Other listed values are E347 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
E347 PWHT-STAB 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 PWHT-STAB has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 51% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
E347 PWHT-STAB is rated for continuous service to 800°C (1,472 °F). It conducts heat at 16.3 W/m·K (9.42 BTU/hr·ft·°F), better than 68% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
E347 PWHT-STAB conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 73% of stainless steel grades.
Sustainability4
Producing a kilogram of E347 PWHT-STAB 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 PWHT-STAB's machinability is fair (42/100, better than 79% of stainless steel grades); weldability excellent (88/100); formability good (62/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E347 PWHT-STAB
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.
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.
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 | — |
E347 PWHT-STAB — frequently asked
What is E347 PWHT-STAB used for?
E347 PWHT-STAB 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 PWHT-STAB?
E347 PWHT-STAB has a typical yield strength of 360 MPa (52.2 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 51% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is E347 PWHT-STAB easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% 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 PWHT-STAB 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 PWHT-STAB?
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 PWHT-STAB 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 PWHT-STAB?
E347 PWHT-STAB 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.