Alloy 330 (UNS N08330): Properties, Standards & Supply
Basic Description
Sagiant Piping Industries supports enquiries for Alloy 330 (UNS N08330, Werkstoff 1.4886) as pipe, tube, buttweld and forged fittings, flanges, bars, sheet/plate, fasteners and furnace components. This nickel-iron-chromium-silicon heat-resistant alloy is widely used for heat-treatment and furnace parts; the producer quotes oxidation resistance to about 1148°C (2100°F), which is an oxidation figure — not a universal nitriding limit, fixture life or pressure-design temperature. Material is offered by product form against the correct ASTM references (B535 seamless, B511/B511M finished bar, B512 reforging stock, B536 plate/sheet, B546 EFW pipe, plus B710 and B739 welded routes), with the exact specification and edition confirmed per order and EN 10204 3.1 or 3.2 documentation. RA330® is a branded product meeting N08330 with tighter producer chemistry — generic inventory is not automatically RA330, and RA330-04 is a separate welding consumable. Sagiant is an independent supplier and stockist, not the alloy producer.
Alloy 330 (N08330): chemistry, properties, standards and RFQ data
Alloy 330 (N08330) composition (generic vs branded RA330), typical mechanical and physical reference data, standards by product form, supported dimensions and high-temperature service guidance. Producer reference values are shown separately from specification acceptance limits confirmed on the certificate; creep and stress-rupture govern furnace-fixture selection.
Technical Specification
| Parameter | Specification |
|---|---|
| Material | Alloy 330 (UNS N08330); nickel-iron-chromium-silicon heat-resistant alloy |
| Branded product | RA330® meets N08330 with tighter producer chemistry & processing (a trademark of the producer) |
| Cross-reference | Werkstoff 1.4886; INCOLOY® alloy 330 (trade names, not proof of certification) |
| Product forms | Seamless & welded pipe/tube, buttweld & forged fittings, flanges, bars, sheet/plate, fasteners, furnace components — by actual route |
| Supply condition | Annealed unless otherwise specified |
| Basis | Producer reference data; specification acceptance limits & edition confirmed per order |
Sagiant is an independent supplier and stockist, not the alloy producer. Generic N08330 inventory is not automatically branded RA330; RA330 trademark attribution is kept distinct from Sagiant’s seller identity.
Chemical Composition (wt %)
| Element | RA330 producer range, mass % |
|---|---|
| Nickel, Ni | 34.0–37.0 |
| Chromium, Cr | 18.0–20.0 |
| Silicon, Si | 1.0–1.5 |
| Carbon, C | 0.04–0.08 |
| Manganese, Mn | ≤2.0 |
| Copper, Cu | ≤1.0 |
| Phosphorus, P | ≤0.03 |
| Sulfur, S | ≤0.03 |
| Iron, Fe | Balance |
Unlisted elements are not automatically zero. Specification limits, nominal producer composition and the actual heat analysis on the certificate are different datasets; the mill certificate governs. A separate generic N08330 column is added only after checking the complete table and notes in the contracted specification.
Alloy identity and designation cross-reference
| Record | Identity / treatment |
|---|---|
| Generic base material | Alloy 330 / UNS N08330 |
| Branded product | RA330® — meets N08330 with tighter producer chemistry & processing |
| European cross-reference | Werkstoff 1.4886 (governing standard & condition confirmed before claiming interchangeability) |
| Trade name | INCOLOY® alloy 330 (identify producer & actual certification if supplied) |
| Related alloy | UNS N08332 — a separate alloy appearing alongside N08330 in ASTM scopes; not a substitute |
| Welding consumable | RA330-04 (UNS N08334) — separate record with different chemistry, not a base-metal grade |
| Comparison alloys | RA333 (N06333), 800H/HT, 310, 601 — comparators, not 330 equivalents |
A “330HC” / high-carbon designation is not listed as confirmed stock: it needs producer, full composition, recognised designation, wrought/cast route, heat treatment and current supply evidence before it can be treated as an ordinary N08330 heat.
Mechanical Properties
| Property (typical, 20°C) | Value |
|---|---|
| Tensile strength | ~586 MPa (85 ksi) |
| 0.2% yield strength | ~269 MPa (39 ksi) |
| Elongation | ~47% |
| Reduction of area | ~65% |
| Hardness | 70–85 HRB |
| Grain size | ASTM 4–7 (typical) |
| Poisson’s ratio | 0.297 |
For furnace-fixture selection the governing dataset is creep and stress-rupture behaviour, not room-temperature tensile values — elevated-temperature tensile, creep rate, stress-to-rupture, weldment and thermal-exposure data are supplied with the applicable qualified dataset (temperature, duration and extrapolation status stated), otherwise identified as unavailable. Code allowable stresses are distinguished from rupture averages.
Physical Properties
| Property | Value |
|---|---|
| Density | ~7.94 g/cm³ (0.287 lb/in³) |
| Melting range | ~1343–1393°C (2450–2540°F) |
| Modulus of elasticity | Per producer temperature series (dynamic/static distinguished) |
| Poisson’s ratio | 0.297 |
| Thermal / electrical | Specific heat, thermal conductivity, electrical resistivity and mean expansion per producer temperature table |
| Magnetic response | State applied field & condition |
The density is ~7.94 g/cm³ (from 0.287 lb/in³), not the previously stated 8.08. A melting interval is not a maximum allowable operating temperature; temperature-dependent properties use all applicable source rows rather than a single unexplained constant.
Standards by Product Form
| Product form | Material / dimensional reference |
|---|---|
| Seamless pipe & tube | ASTM B535 |
| Finished bars & shapes | ASTM B511/B511M |
| Billets/bars for reforging | ASTM B512 (reforging stock only) |
| Plate / sheet / strip | ASTM B536 |
| Electric fusion-welded pipe | ASTM B546 (manufacturing & inspection class identified) |
| Auto-welded pipe (no filler) | ASTM B710 |
| Welded tube | ASTM B739 (OD × wall) |
| General-service tubing (alt.) | ASTM A269/A269M lists N08330/N08332 — check complete requirements & order applicability |
| Buttweld fittings | ASTM B366 — verify exact N08330 grade/class & edition; B16.9 dimensional basis |
| Forgings / flanges | ASTM B564 acceptance verified (or the actual alternative); B16.5 dimensions do not supply material certification |
| Fasteners | Actual material, mechanical requirements, threads, condition & test plan (bar certification alone is insufficient) |
| Fabricated furnace parts | Drawing, material standard, fabrication/welding procedure, dimensional acceptance & inspection |
EN 10095, AMS 5592/5716 and ASME SB references are added only with verified product scope, current edition and actual certification. A producer’s general reference list is not a promise that every form meets every specification.
Available Forms, Sizes & Dimensions
| Form | Range / basis |
|---|---|
| Pipe | Discrete NPS/schedule combinations by route; B36.10M / B36.19M (S) basis where applicable, subject to mill confirmation |
| Auto-welded pipe (B710) | Through NPS 12 in schedules 5S/10S/40S/80S; other dimensions when remaining requirements are met & documented |
| Tube | Stated as OD × wall, nominal/minimum wall basis, seamless/welded route, lengths, ends & tolerances |
| Bar / shapes | By dimension & condition, subject to confirmation |
| Sheet / plate / strip | By thickness & tolerance per form |
| Flanges (Class 150–1500) | Type, facing, bore, class, material specification & design basis stated; material acceptance verified |
Class is a rating designation, not pressure in psi, and those ratings do not apply at high service temperatures such as 1150°C. Unsupported combinations are marked “not standardized”, “not offered” or “subject to mill confirmation” rather than filled with guessed walls.
Service: Oxidation, Carburisation & Nitriding
| Mechanism | Consideration |
|---|---|
| Oxidation | Producer oxidation resistance to ~1148°C (2100°F); not a universal service, nitriding or pressure-design temperature |
| Carburisation | Good resistance in carburising atmospheres; documented RA330 failures under severe carbon conditions (metal dusting) |
| Nitriding | Nitrogen-induced embrittlement and service-life tradeoffs apply; not a blanket nitriding limit |
| Environment factors | Atmosphere, temperature, duration/cycles, carbon potential, nitrogen activity, oxygen potential, sulphur contamination and applied stress |
| Aqueous | Chloride-SCC resistance is not extended into blanket chloride pitting, crevice, seawater or acid resistance |
The protective scale behaviour depends on alloy chemistry and surface-scale condition together; oxidation, carburisation, nitriding, carbonitriding, metal dusting, thermal fatigue and aqueous corrosion are assessed separately for the actual atmosphere and duty.
Applications
| Component | Considerations |
|---|---|
| Furnace baskets & fixtures | Load, support spacing, thermal expansion & cyclic duty |
| Retorts & muffles | Atmosphere containment & thermal cycling |
| Radiant tubes & fans | Temperature, atmosphere & distortion control |
| Quench fixtures & conveyors | Thermal shock, loading & wear |
Generic industry names alone do not establish suitability; equipment, process conditions and selection limitations are reviewed for each case.
Welding, Heat Treatment & Fabrication
| Operation | Guidance |
|---|---|
| Welding filler | RA330-04 recommended for RA330; the producer cautions against AWS ER330 wire and E330-16 electrodes for RA330 service |
| Procedure | Full-penetration joints, qualified WPS, preheat/interpass control, shielding/back purge, cleanliness, heat input & hot-cracking control |
| Forming & machining | Hot/cold forming, work hardening, machining practice and scale removal per qualified practice |
| Heat treatment | Not age-hardenable, but this does not mean it “never needs heat treatment”; annealing temperature/time/cooling are set by form and procedure |
| Inspection | Weld inspection and dissimilar-joint limits per the qualified procedure |
“Matching / over-alloyed filler” is too vague for RA330 — the specific consumable (RA330-04) and the cautions above are stated to avoid the wrong selection.
Testing & Documentation
| Item | Scope |
|---|---|
| Grain size | ASTM B536 states no grain-size requirement for N08330 (it treats N08332 differently); a supplementary grain-size test can be ordered with stated method, acceptance criterion & documentation |
| PMI | Confirms alloy identity within the instrument’s capability; does not replace full laboratory chemistry |
| Certification | EN 10204 3.1 (manufacturer) vs 3.2 (independent/third-party) — specified at ordering |
| Traceability | Heat-number traceability supported |
A producer’s typical grain size is not a universal ASTM requirement; certificate type and required tests are agreed at ordering rather than promised unconditionally.
Product Range
The alloy 330 range can be supplied with related pipes, tubes, butt weld fittings, forged fittings, flanges, fasteners and custom fabricated items where required by the BOQ.
Applications
For dimensional references, see the Pipe Schedule & Fittings Guide. For related supply, review Pipes & Tubes, Butt Weld Fittings, Forged Fittings and Flanges.
Types of Products
| Type | Description |
|---|---|
| Pipes & Tubes | Seamless, welded and large-diameter supply |
| Fittings | Butt weld, forged and fabricated fittings |
| Flanges | Forged flanges and special machined items |
| Plates / Bars / Round Bars | Subject to grade and project availability |
Available Forms
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Frequently Asked Questions
Is Alloy 330 the same as RA330 and UNS N08330?
Alloy 330 is the generic UNS N08330 grade; RA330® is a branded product that meets N08330 with tighter producer chemistry and processing. They are not interchangeable labels — generic N08330 inventory is not automatically RA330. Werkstoff 1.4886 and INCOLOY® alloy 330 are cross-reference names. We identify material by UNS N08330 and the applicable specification, and Sagiant is an independent supplier and stockist, not the alloy producer.
Do you supply a “330HC” high-carbon grade?
A “330HC” designation is not listed as confirmed stock. A carbon content above the base N08330 specification cannot simply be presented as an ordinary heat — it needs a named producer, full composition, a recognised designation, the wrought or cast route, heat treatment and mechanical/creep data before it can be quoted. UNS N08332 is a separate related alloy, not automatically 330HC or a substitute.
What is the composition of Alloy 330?
Producer RA330 limits are approximately Ni 34–37, Cr 18–20, Si 1.0–1.5, C 0.04–0.08, with Mn, Cu, P and S controlled and iron as balance. That is a branded-product table, not a universal acceptance table for all generic N08330 supply; generic limits come from the contracted specification, and the mill certificate governs. Unlisted elements are not automatically zero.
Which specifications apply to Alloy 330 by product form?
Seamless pipe/tube to ASTM B535, finished bars/shapes to B511/B511M, reforging stock to B512, plate/sheet/strip to B536, electric fusion-welded pipe to B546, auto-welded pipe (no filler) to B710 and welded tube to B739. A269/A269M is a general-service tubing route that lists N08330/N08332. Fitting (B366) and forging/flange (B564) grade coverage is verified for the exact edition; a dimensional standard alone does not certify the material. Editions are confirmed per order with EN 10204 3.1 or 3.2 documentation.
What temperature can Alloy 330 be used at?
The producer quotes oxidation resistance to about 1148°C (2100°F). That is an oxidation figure, not a universal nitriding limit, a guaranteed fixture life or a pressure-design temperature. Oxidation, carburisation, nitriding and metal dusting are different mechanisms with different limits, and usable temperature depends on atmosphere, stress, cycles and duration — for furnace-fixture selection the governing data are creep and stress-rupture, not room-temperature strength.
What welding consumable is used for RA330?
The producer recommends RA330-04 filler for RA330 and cautions against using AWS ER330 wire and E330-16 electrodes, which perform differently in service. A vague “matching or over-alloyed filler” instruction is not sufficient. Weld procedures use full-penetration joints and are qualified for the intended service.
What information is needed for a quotation?
Provide the product form, dimensions and tolerances, quantity, condition, the exact specification and edition, service temperature, atmosphere, loading and thermal cycles, required testing, traceability and certificate type (EN 10204 3.1 or 3.2), finish and delivery location. Availability and the accepted specification route are confirmed with the quotation.
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