Stainless Steel E330H SERV
Heat-treated state
UNS W88335
SERV = service-exposed / thermally aged deposit
Reference condition for assessing repair of parts already in high-temperature service: carbide precipitation raises strength/hardness and cuts room-temperature ductility.
Values for the SERV condition
Other E330H tempers and conditions
E330H is listed in 4 conditions; see the grade overview at E330H.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
E330H-15 | Choose the -15 basic coating for out-of-position work and maximum resistance to hot cracking in thick heat-resistant castings; DCEP only. | 415 | 590 | 16 | 205 HB | 1.7 % IACS |
AWDefault As-welded deposit | Standard supply/qualification condition: deposit used directly in the as-welded state for furnace and heat-resistant casting repair. | 420 | 600 | 15 | 210 HB | 1.7 % IACS |
E330H-16 | Choose the -16 coating for smoother arc, better bead appearance and AC capability on general furnace-part repair. | 430 | 610 | 14 | 215 HB | 1.7 % IACS |
SERVThis page Service-exposed / thermally aged deposit | Reference condition for assessing repair of parts already in high-temperature service: carbide precipitation raises strength/hardness and cuts room-temperature ductility. | 470 | 640 | 6 | 22 HRC | 1.8 % IACS |
What is E330H SERV?
E330H SERV is E330H heat treated to SERV — reference condition for assessing repair of parts already in high-temperature service: carbide precipitation raises strength/hardness and cuts room-temperature ductility. E330H SERV has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 74% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 193 GPa (28 Msi). E330H SERV has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,370°C (2,498 °F). AW is the default condition FabDigit quotes; SERV is available on request or by drawing note.
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- Limited ductility — 6%, worse than 99% of stainless steel grades
- Difficult to machine — 17/100, worse than 99% of stainless steel grades
- High embodied carbon — 8 kg CO₂/kg, worse than 99% of stainless steel grades
- Low fracture toughness — 40 MPa·√m (36.4 ksi·√in), worse than 97% of stainless steel grades
- Limited formability — 8/100, worse than 97% of stainless steel grades
E330H SERV properties
Typical room-temperature values for E330H SERV; 23 are specific to this condition. Other listed values are E330H reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
E330H SERV has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
E330H SERV has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 74% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
E330H SERV is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 13.5 W/m·K (7.8 BTU/hr·ft·°F), worse than 83% of stainless steel grades. Thermal expansion is 15 µm/m·K (8.33 µin/in·°F).
Electrical3
E330H SERV conducts electricity at 1.8 % IACS, worse than 88% of stainless steel grades.
Chemical & Environmental2
Corrosion resistance is fair (45/100), worse than 85% of stainless steel grades.
Sustainability4
Producing a kilogram of E330H SERV takes about 95 MJ of energy and emits 8 kg of CO₂ — more than 96% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
E330H SERV's machinability is poor (17/100, worse than 99% of stainless steel grades); weldability poor (30/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E330H SERV
Is E330H easy to machine?
Deposit machines poorly — use rigid setups, low speed, heavy positive-rake carbide and generous coolant; grinding is often preferred over cutting on carbide-rich weld beads.
Can E330H be welded?
Use stringer beads, low heat input, interpass temperature below ~150 °C on new work (or 300–500 °C preheat on heavily carburized castings), clean/grind carburized surfaces first, and re-dry electrodes to avoid porosity and hot cracking.
Can E330H be formed, bent or molded?
Not a formable product form; the deposit is high-carbon fully austenitic weld metal and should not be cold-bent.
What surface finishes work on E330H?
Grind and blend beads, pickle/passivate or wire-brush with stainless tooling; no anodizing, and plating is rarely used since parts run in high-temperature service.
E330H 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 |
|---|---|---|
| Chigh-carbon variant of E330 for creep strength | 0.35 – 0.45 | 0.4 |
| Cr | 14 – 17 | 15.5 |
| Ni | 33 – 37 | 35 |
| Mn | 1 – 2.5 | 1.8 |
| Si | ≤ 0.9 | 0.6 |
| Moresidual | ≤ 0.75 | — |
| Curesidual | ≤ 0.75 | — |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Fe | balance | — |
E330H SERV — frequently asked
What is E330H SERV used for?
E330H SERV is typically used for high-temperature furnace components, radiant tubes and heat-treatment fixtures. In short: creep-strength E330 variant; only 15 % elongation; 1100 °C service.
What is the yield strength of E330H SERV?
E330H SERV has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 74% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is E330H SERV easy to machine?
Not especially — machinability is rated poor (17/100, worse than 99% of stainless steel grades). Deposit machines poorly — use rigid setups, low speed, heavy positive-rake carbide and generous coolant; grinding is often preferred over cutting on carbide-rich weld beads.
Can E330H SERV be welded?
Not readily — weldability is rated poor (30/100). Use stringer beads, low heat input, interpass temperature below ~150 °C on new work (or 300–500 °C preheat on heavily carburized castings), clean/grind carburized surfaces first, and re-dry electrodes to avoid porosity and hot cracking.
What surface finishes work on E330H SERV?
Grind and blend beads, pickle/passivate or wire-brush with stainless tooling; no anodizing, and plating is rarely used since parts run in high-temperature service.
Can E330H SERV be formed, bent or molded?
Not a formable product form; the deposit is high-carbon fully austenitic weld metal and should not be cold-bent.
What is the maximum service temperature of E330H SERV?
E330H SERV is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E330H-AW and E330H SERV?
AW is the default condition — standard supply/qualification condition: deposit used directly in the as-welded state for furnace and heat-resistant casting repair. SERV: reference condition for assessing repair of parts already in high-temperature service: carbide precipitation raises strength/hardness and cuts room-temperature ductility. Yield strength is 420 MPa in AW versus 470 MPa in SERV.
Sources
- AWS A5.4/A5.4M — Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding — American Welding Society (2012)
- SAE/ASTM Unified Numbering System (UNS W88335) — SAE International / ASTM (2017)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (heat-resistant alloy welding) — ASM International (1993)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (Alloy 330 / HT-HU castings) — ASM International (1990)
- Heat-resistant 35Ni-15Cr covered electrode datasheets (E330 / E330H class) — welding 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.