Stainless Steel E2593
UNS W39593 · ASTM A5.4
E2593 is a 25Cr-9Ni-3Mo super duplex stainless covered electrode classified under AWS A5.4 (UNS W39593) and supplied in -15, -16 and -17 coating types.
Reference datasheet — E2593 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
E2593 tempers and conditions
E2593 is supplied in 5 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution Annealed | Pick when the fabricated component can be furnace treated: rebalances ferrite/austenite, dissolves nitrides and sigma, and maximises toughness and corrosion resistance. | 580 | 800 | 28 | 23 HRC | 2.2 % IACS |
E2593-17 | Higher silica variant for very flat, fine-rippled beads and high deposition on flat/horizontal fillets; slightly reduced out-of-position control. | 610 | 825 | 22 | 25 HRC | 2.1 % IACS |
AWDefault As-welded deposit | Standard condition for field and shop duplex weldments; use with controlled heat input (0.5–2.0 kJ/mm) and interpass ≤150 °C. | 620 | 830 | 22 | 26 HRC | 2.1 % IACS |
E2593-16 | General-purpose all-position electrode with smooth arc and easy slag removal; the most commonly stocked coating type. | 620 | 830 | 22 | 26 HRC | 2.1 % IACS |
E2593-15 | Choose for the cleanest, lowest-hydrogen deposit and best impact toughness, especially on root passes and restrained joints. | 630 | 840 | 23 | 27 HRC | 2.1 % IACS |
What is E2593?
E2593 is a 25Cr-9Ni-3Mo super duplex stainless covered electrode classified under AWS A5.4 (UNS W39593) and supplied in -15, -16 and -17 coating types. Engineers select it for high-strength duplex weldments in chloride-bearing service, where as-welded deposits give about 620 MPa yield, 830 MPa tensile and 22% elongation at roughly 265 HB (26 HRC). Heat input and interpass temperature must be controlled to keep the austenite/ferrite balance, and service is limited to about 260 °C to avoid embrittlement. Where higher pitting and crevice resistance is required, E2594 is the nearest alternative. E2593 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F). E2593 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
What is E2593 used for?
- offshore platforms
- seawater handling systems
- sour service piping
Advantages
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
- Good corrosion resistance — 80/100, better than 88% of stainless steel grades
Limitations
- Limited service temperature — 260°C (500 °F), worse than 98% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- High embodied carbon — 5.6 kg CO₂/kg, worse than 83% of stainless steel grades
- Low fracture toughness — 80 MPa·√m (72.8 ksi·√in), worse than 79% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
E2593 properties
Typical room-temperature values for E2593-AW; bars are the position among stainless steel grades.
Physical3
E2593 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical17
E2593 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
E2593 is rated for continuous service to 260°C (500 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
E2593 conducts electricity at 2.1 % IACS, worse than 73% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of E2593 takes about 62 MJ of energy and emits 5.6 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 55%.
Manufacturability6
E2593's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability very good (75/100); formability poor (30/100).
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. E2593 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E2593
Is E2593 easy to machine?
Weld deposit is tough and work-hardening: use rigid setups, sharp carbide, heavy positive feed and low speed; grinding is often easier than turning.
Can E2593 be welded?
SMAW DCEP (or AC for -16/-17); redry electrodes 250–300 °C/1–2 h, keep heat input 0.5–2.0 kJ/mm and interpass ≤150 °C to hold ferrite about 30–60 FN.
Can E2593 be formed, bent or molded?
Not a wrought form — deposit is used as-welded; cold straightening of duplex weldments should be avoided to prevent cracking.
E2593 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 |
|---|---|---|
| Cundiluted weld metal, AWS A5.4 | ≤ 0.04 | 0.03 |
| Cr | 24 – 27 | 25.5 |
| Ni | 8.5 – 10.5 | 9.5 |
| Mo | 2.9 – 3.9 | 3.3 |
| Cu | 1.5 – 3 | 2 |
| N | 0.08 – 0.25 | 0.18 |
| Mn | 0.5 – 1.5 | 0.9 |
| Si | ≤ 1 | 0.6 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance |
What surface finishes work on E2593?
Remove all slag and heat tint, then pickle (HNO₃-HF) and passivate; unremoved oxide sharply lowers pitting resistance.
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 E2593 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W39593
- ASTM
- A5.4
How much does E2593 cost?
E2593 is a high-cost stainless steel ($$$$), pricier than about 78% 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.
E2593 — frequently asked
What is E2593 used for?
E2593 is typically used for offshore platforms, seawater handling systems and sour service piping. In short: high-strength duplex deposit; chloride and sour service; ferrite-balanced 25Cr filler.
What is the yield strength of E2593?
E2593 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is E2593 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Weld deposit is tough and work-hardening: use rigid setups, sharp carbide, heavy positive feed and low speed; grinding is often easier than turning.
Can E2593 be welded?
Yes — weldability is rated very good (75/100). SMAW DCEP (or AC for -16/-17); redry electrodes 250–300 °C/1–2 h, keep heat input 0.5–2.0 kJ/mm and interpass ≤150 °C to hold ferrite about 30–60 FN.
What surface finishes work on E2593?
Remove all slag and heat tint, then pickle (HNO₃-HF) and passivate; unremoved oxide sharply lowers pitting resistance.
Can E2593 be formed, bent or molded?
Not a wrought form — deposit is used as-welded; cold straightening of duplex weldments should be avoided to prevent cracking.
What is the maximum service temperature of E2593?
E2593 is rated for continuous use to about 260°C (500 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E2593-AW and E2593-SA?
AW is the default condition — standard condition for field and shop duplex weldments; use with controlled heat input (0.5–2.0 kJ/mm) and interpass ≤150 °C. SA: pick when the fabricated component can be furnace treated: rebalances ferrite/austenite, dissolves nitrides and sigma, and maximises toughness and corrosion resistance. Yield strength is 620 MPa in AW versus 580 MPa in SA.
How much does E2593 cost?
E2593 is a high-cost stainless steel ($$$$), pricier than about 78% 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)
- ASTM A790/A928 & UNS S32550 chemical and mechanical requirements — ASTM International (2020)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (duplex stainless weld metal) — ASM International (1993)
- Super duplex covered electrode all-weld-metal data (ESAB/Böhler/Sandvik equivalents) — Various 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.