Stainless Steel E3155-SR (Stress relieved)
Heat-treated state
UNS W73155
Choose when weld residual stress must be reduced on rigid turbine hardware without full solution treatment.
Values for the SR condition
Other E3155 tempers and conditions
E3155 is listed in 6 conditions; see the grade overview at E3155.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Use when the weldment is solution treated with the parent N-155 part to dissolve carbides and maximise ductility. | 380 | 720 | 35 | 11 HRC | 1.9 % IACS |
Titania/lime coated electrode, AC or DCEP | Choose when AC power or a smoother arc and better slag release are needed; slightly higher deposit oxygen. | 455 | 755 | 24 | 16 HRC | 1.9 % IACS |
AWDefault As-welded deposit | Default condition for repair and fabrication welds where no post-weld heat treatment is applied. | 460 | 760 | 25 | 215 HB | — |
SRThis page Stress relieved | Choose when weld residual stress must be reduced on rigid turbine hardware without full solution treatment. | 470 | 770 | 22 | 220 HB | 1.9 % IACS |
Lime (basic) coated electrode, DCEP | Basic-coated version for DC reverse polarity, all-position work with the cleanest, lowest-hydrogen deposit. | 470 | 765 | 25 | 17 HRC | 1.9 % IACS |
Solution annealed and aged | Pick for maximum elevated-temperature strength and creep resistance matching aged N-155 base metal. | 510 | 810 | 20 | 22 HRC | 1.8 % IACS |
What is E3155-SR?
E3155-SR is E3155 heat treated to SR — choose when weld residual stress must be reduced on rigid turbine hardware without full solution treatment. E3155-SR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 770 MPa (112 ksi) — stronger than 74% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi). E3155-SR has a density of 8.19 g/cm³ (0.296 lb/in³), heavier than 100% of stainless steel grades. It melts at 1,288°C (2,350 °F). AW is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
Limitations
- Difficult to machine — 15/100, worse than 100% of stainless steel grades
- High embodied carbon — 9.5 kg CO₂/kg, worse than 100% of stainless steel grades
- Poor heat conductor — 12.6 W/m·K (7.28 BTU/hr·ft·°F), worse than 88% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
E3155-SR properties
Typical room-temperature values for E3155-SR; 21 are specific to this condition. Other listed values are E3155 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
E3155-SR has a density of 8.19 g/cm³ (0.296 lb/in³), heavier than 100% of stainless steel grades. It melts at 1,288°C (2,350 °F).
Mechanical14
E3155-SR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 770 MPa (112 ksi) — stronger than 74% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
E3155-SR is rated for continuous service to 815°C (1,499 °F). It conducts heat at 12.6 W/m·K (7.28 BTU/hr·ft·°F), worse than 88% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
E3155-SR conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (67/100), better than 61% of stainless steel grades.
Sustainability4
Producing a kilogram of E3155-SR takes about 125 MJ of energy and emits 9.5 kg of CO₂ — more than 100% of stainless steel grades. Typical recycled content is 30%.
Manufacturability7
E3155-SR's machinability is poor (15/100, worse than 100% of stainless steel grades); weldability very good (70/100); formability poor (32/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E3155-SR
Is E3155 easy to machine?
Weld deposits machine like N-155: rigid setups, positive-rake carbide, low speed (~15–25 m/min) and heavy positive feed to cut under the work-hardened skin; grinding is often preferred for weld dressing.
Can E3155 be welded?
Deposit with low heat input, stringer beads and interpass ≤150 °C; no preheat needed but keep electrodes dried (~300 °C) and back-purge thin exhaust sections to prevent oxidation and hot cracking.
Can E3155 be formed, bent or molded?
Not a wrought product form; matching wrought N-155 sheet is cold formed with generous radii and frequent 1175 °C solution anneals because of rapid work hardening.
What surface finishes work on E3155?
Pickle or bead-blast then passivate to remove Cr-rich heat tint; no anodizing — high-temperature aluminide or thermal-barrier coatings are used for turbine hot-section service.
E3155 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 |
|---|---|---|
| C | 0.1 – 0.2 | 0.15 |
| Cr | 20 – 22.5 | 21 |
| Ni | 19 – 21 | 20 |
| Co | 18.5 – 21 | 20 |
| Mo | 2.5 – 3.5 | 3 |
| W | 2 – 3 | 2.5 |
| Nb+Tacolumbium plus tantalum | 0.75 – 1.25 | 1 |
| Ninterstitial strengthener | 0.1 – 0.2 | 0.15 |
| Mn | 1 – 2.5 | 1.6 |
| Si | ≤ 1 | 0.5 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cu | ≤ 0.5 | — |
| Febalance, approx. 28–32 % | balance | — |
E3155-SR — frequently asked
What is E3155-SR used for?
E3155-SR is typically used for gas turbine components, exhaust manifolds, high-temperature fasteners and aerospace hot-section repair. In short: superalloy-grade hot strength; N-155 matching filler; turbine and exhaust repair.
What is the yield strength of E3155-SR?
E3155-SR has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 770 MPa (112 ksi) — stronger than 74% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is E3155-SR easy to machine?
Not especially — machinability is rated poor (15/100, worse than 100% of stainless steel grades). Weld deposits machine like N-155: rigid setups, positive-rake carbide, low speed (~15–25 m/min) and heavy positive feed to cut under the work-hardened skin; grinding is often preferred for weld dressing.
Can E3155-SR be welded?
Yes — weldability is rated very good (70/100). Deposit with low heat input, stringer beads and interpass ≤150 °C; no preheat needed but keep electrodes dried (~300 °C) and back-purge thin exhaust sections to prevent oxidation and hot cracking.
What surface finishes work on E3155-SR?
Pickle or bead-blast then passivate to remove Cr-rich heat tint; no anodizing — high-temperature aluminide or thermal-barrier coatings are used for turbine hot-section service.
Can E3155-SR be formed, bent or molded?
Not a wrought product form; matching wrought N-155 sheet is cold formed with generous radii and frequent 1175 °C solution anneals because of rapid work hardening.
What is the maximum service temperature of E3155-SR?
E3155-SR is rated for continuous use to about 815°C (1,499 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E3155-AW and E3155-SA?
AW is the default condition — default condition for repair and fabrication welds where no post-weld heat treatment is applied. SA: use when the weldment is solution treated with the parent N-155 part to dissolve carbides and maximise ductility. Yield strength is 460 MPa in AW versus 380 MPa in SA.
Sources
- AWS A5.4/A5.4M — Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding — AWS (2012)
- SAE AMS 5794 / AMS 5769 — Alloy N-155 (UNS R30155) bar and sheet — SAE International (2018)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys (Multimet/N-155) — ASM International (1990)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (heat-resistant alloy filler metals) — ASM International (1993)
- UNS W73155 / R30155 alloy data — SAE/ASTM Metals & Alloys in the Unified Numbering System (2017)
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.