Stainless Steel E3155 SA+A
Precip hard
UNS W73155
SA+A = solution annealed and aged
Pick for maximum elevated-temperature strength and creep resistance matching aged N-155 base metal.
Values for the SA+A 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 | — |
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 |
SA+AThis page 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 SA+A?
E3155 SA+A is E3155 in the SA+A condition — pick for maximum elevated-temperature strength and creep resistance matching aged N-155 base metal. E3155 SA+A has a yield strength of 510 MPa (74 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 78% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi). E3155 SA+A 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; SA+A is available on request or by drawing note.
Advantages
- High strength — 510 MPa (74 ksi), better than 78% of stainless steel grades
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
Limitations
- Difficult to machine — 13/100, worse than 100% of stainless steel grades
- High embodied carbon — 9.5 kg CO₂/kg, worse than 100% of stainless steel grades
- Low electrical conductivity — 1.8 % IACS, worse than 87% of stainless steel grades
- Poor heat conductor — 12.9 W/m·K (7.45 BTU/hr·ft·°F), worse than 86% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
E3155 SA+A properties
Typical room-temperature values for E3155 SA+A; 23 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 SA+A 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 SA+A has a yield strength of 510 MPa (74 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 78% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
E3155 SA+A is rated for continuous service to 815°C (1,499 °F). It conducts heat at 12.9 W/m·K (7.45 BTU/hr·ft·°F), worse than 86% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
E3155 SA+A conducts electricity at 1.8 % IACS, worse than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (64/100), better than 54% of stainless steel grades.
Sustainability4
Producing a kilogram of E3155 SA+A 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 SA+A's machinability is not recommended (13/100, worse than 100% of stainless steel grades); weldability good (60/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E3155 SA+A
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 SA+A — frequently asked
What is E3155 SA+A used for?
E3155 SA+A 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 SA+A?
E3155 SA+A has a typical yield strength of 510 MPa (74 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 78% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is E3155 SA+A easy to machine?
Not especially — machinability is rated not recommended (13/100, 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 SA+A be welded?
Yes — weldability is rated good (60/100). 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 SA+A?
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 SA+A 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 SA+A?
E3155 SA+A 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.