Stainless Steel E330H
UNS W88335
E330H is the higher-carbon variant of the E330 heat-resistant austenitic electrode (W88335), the added carbon raising creep strength for prolonged high-temperature service.
Reference datasheet — E330H 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
E330H tempers and conditions
E330H is supplied in 4 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
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 |
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?
E330H is the higher-carbon variant of the E330 heat-resistant austenitic electrode (W88335), the added carbon raising creep strength for prolonged high-temperature service. It is used to weld and repair radiant tubes, furnace internals and heat-treatment fixtures, including heavily carburized castings, and is supplied as -15 and -16 coated electrodes. The deposit gives 420 MPa yield, 600 MPa tensile and 210 HB with service to 1100 °C, but elongation falls to 15 %, so it is unsuitable for joints that need cold straightening. Choose standard E330 where deposit ductility matters more than creep strength. E330H 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). E330H has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 196 GPa (28.4 Msi).
What is E330H used for?
- high-temperature furnace components
- radiant tubes
- heat-treatment fixtures
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- High embodied carbon — 8 kg CO₂/kg, worse than 99% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Hard to polish — 50/100, worse than 93% of stainless steel grades
- Poor heat conductor — 12.5 W/m·K (7.22 BTU/hr·ft·°F), worse than 90% of stainless steel grades
E330H properties
Typical room-temperature values for E330H-AW; bars are the position among stainless steel grades.
Physical3
E330H 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 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
E330H is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 12.5 W/m·K (7.22 BTU/hr·ft·°F), worse than 90% of stainless steel grades. Thermal expansion is 15 µm/m·K (8.33 µin/in·°F).
Electrical3
E330H conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of E330H 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's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability good (55/100); formability poor (20/100).
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. E330H is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E330H
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.
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 |
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.
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 E330H in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W88335
- Also called
- AWS A5.4 E330H
How much does E330H cost?
E330H 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.
E330H — frequently asked
What is E330H used for?
E330H 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?
E330H has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is E330H easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% 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 be welded?
Yes — weldability is rated good (55/100). 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?
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 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?
E330H 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.
How much does E330H cost?
E330H 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)
- 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; 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.