1.4886

Section 01What is 1.4886 material?

1.4886 is a heat-resisting alloy for equipment that operates continuously inside high-temperature furnaces.

The alloy carries about twice the nickel of 310S. That nickel does two jobs. It keeps the structure austenitic from room temperature up to melting, which removes the risk of sigma-phase embrittlement during long high-temperature holds, and it slows the rate at which carbon diffuses into the surface. The silicon content of 0.75 to 1.50 % stabilises the surface oxide, so the scale stays adherent through repeated heating and cooling instead of spalling off onto the workload below.

1.4886 therefore handles thermal cycling better than most heat-resisting grades. Furnace fixtures made from it survive cycles that crack cast alternatives. A forged fixture can also be made thinner than a cast one at equal strength, so less furnace energy goes into heating the fixture and more into heating the parts.

Jiangyin Jiangnan Metal Co., Ltd. supplies this grade as open-die forgings and seamless rolled rings, not as stock plate or sheet. Forging breaks down the as-cast structure, closes porosity and aligns the grain flow with the part contour, which matters for components carrying load at temperature.

Section 02Equivalent designations and cross-reference

1.4886, UNS N08330, Alloy 330, AISI 330, SUH 330, RA330 and Incoloy 330 all describe the same nickel-iron-chromium-silicon heat-resisting alloy. The chemistry limits differ slightly between standards, so always state on the purchase order which specification the forgings are to be certified against.

1.4864 and 1.4886 are frequently confused. Both sit in the Alloy 330 family. Where an order references EN 10095, the chemistry follows the EN table. Where it references ASTM, the UNS N08330 table governs. Chromium is the element that most often differs. If your drawing quotes both, tell us which one takes precedence before we melt.

Section 03Chemical composition

Nominal composition of 1.4886 / UNS N08330, weight percent. Every heat we forge is certified against the ordered specification with a ladle analysis. A product analysis is available on request.

Values are the commonly specified limits for UNS N08330. Confirm against the current edition of the standard named on your order. EN 10095 limits for 1.4864 and 1.4886 differ slightly.

Section 04Mechanical and physical properties

Room-temperature mechanical properties, solution annealed

Typical values, not guaranteed minima. Specification minima for bar and forgings are lower. The certified figures for your order are those of the standard named on the purchase order, measured on test material from the same heat and heat-treatment lot.

Physical properties

Heat treatment

1.4886 forgings are supplied solution annealed, typically in the region of 1040 to 1150 °C followed by rapid cooling. The alloy has a solid-solution composition and gains nothing from an ageing cycle. Solution annealing plus ageing is the wrong route for this grade. A supplier offering it has confused N08330 with a precipitation-hardening nickel alloy such as Incoloy 925 or Inconel 718. Confirm the exact annealing temperature and cooling medium against the specification on your order.

Section 05Standards and specifications

UNS N08330 is covered by a family of ASTM B-series specifications rather than by a single forging standard. Forging stock is ordered to ASTM B512. Finished forged bars and shapes are normally certified to the chemistry and mechanical requirements of ASTM B511.

One point worth checking, because it appears on a great many supplier sites: ASTM B564 does not list UNS N08330. B564 covers the Ni-Fe-Cr forging grades N08120, N08800, N08810 and N08811 among others. If a drawing calls for N08330 to ASTM B564, raise it with the design authority before the order is placed. We flag it at quotation stage rather than after the ingot is cast.

Section 06Forged forms and size range

Jiangyin Jiangnan Metal produces 1.4886 to drawing as open-die forgings and seamless rolled rings. The ranges below are indicative. Send the drawing and we will confirm against press and ring-mill capacity.

Supply condition options: as-forged, rough-machined with stock allowance, or finish-machined to print. State the machining allowance you want on the enquiry. Leaving it to the supplier is the most common cause of scrap at the customer's own lathe.

Section 07Manufacturing route

Route from ingot to finished forging:

1. Melting. Electric arc furnace with VOD refining. Electroslag remelting is added where the specification or the application calls for tighter cleanliness and reduced segregation.
2. Ingot to billet. Cogging on the open-die press, with a controlled forging reduction ratio so the as-cast dendritic structure is fully broken down.
3. Forging or ring rolling. Open-die forging to shape, or upsetting, punching and ring rolling for seamless rings. Finish temperature is controlled to keep the grain structure uniform through section.
4. Solution annealing. Furnace charge with recorded temperature-time chart, followed by rapid cooling. Charts are retained and issued with the certificate.
5. Machining. Rough or finish machining, depending on the supply condition ordered.
6. Non-destructive testing. Ultrasonic examination to the acceptance class named on the order.
7. Certification and release. Mill certificate issued, marking applied, packing to the agreed export standard.

Section 08Where 1.4886 forgings are used

Typical applications are components that sit inside hot process equipment and cycle in temperature.

Industrial heat treatment and furnace equipment

Muffles and retorts, radiant tube components, carburising baskets, boxes and grids, hangers, hooks and conveyor chain links, furnace roller shafts and bushings, brazing jigs and fixtures. This is the main market for the grade, since resistance to alternating carburising and oxidising atmospheres is what it was developed for.

Petrochemical and chemical process

Flare-stack tips, combustion tube components, thermocouple sheaths, forged flanges and tube sheets for high-temperature heat exchangers, valve bodies, seat rings and stems in hot gas service.

Power generation and heavy machinery

Rotating components exposed to hot gas, forged rings and discs for hot-end assemblies, fan hubs and shafts for high-temperature circulation.

Cement, glass, mineral and ore processing

Kiln and cooler internals, nose-ring segments, forged rolls and wear components, grate parts and support castings replaced with forged equivalents for longer cycle life.

Enamelling and metal finishing

Hangers, hooks and racks that carry vitreous-enamelled parts through firing, where a spalling oxide scale would fall onto and ruin the enamel finish. The silicon-stabilised scale on 1.4886 is why the grade is specified here.

Section 09Testing, inspection and certification

Non-destructive testing

1.4886 forgings are ultrasonically examined to the standard and acceptance class stated on the order. Commonly specified: EN 10228-3, SEP 1921 and ASTM A388. Dye-penetrant examination to ASTM E165 or EN 571-1 is available for machined surfaces. Austenitic material attenuates and scatters ultrasound more than ferritic steel, so agree the acceptance class and the examination surface condition at enquiry stage rather than after machining.

Mechanical and metallurgical testing

• Tensile testing at room temperature, elevated-temperature tensile on request
• Hardness survey
• Grain size determination to ASTM E112
• Intergranular corrosion testing where the order calls for it
• Chemical analysis, ladle as standard, product analysis on request

Documentation

Material certificates are issued to EN 10204 type 3.1 as standard, or type 3.2 countersigned by a third-party inspectorate such as TUV, SGS, BV or Lloyd's where the order requires it. Every certificate carries the heat number, the ladle analysis, the mechanical results, the heat-treatment record and the NDT report. Every forging is hard-stamped with the heat number so it can be traced back to the melt.

Section 10How to request a quotation

Send a drawing if you have one. If you do not, the six items below are enough for us to price the job and to avoid the misunderstandings that cost both sides money later.

1. Grade and governing standard. For example, UNS N08330 to ASTM B511, or 1.4886 to EN 10095. Tell us which one wins if the drawing names both.
2. Form and dimensions. Finished size plus the machining allowance you want, or the finished print if we are machining.
3. Quantity and delivery date.
4. Supply condition. As-forged, rough-machined or finish-machined.
5. Testing requirements. UT standard and acceptance class, plus any additional mechanical or corrosion tests.
6. Certification. EN 10204 3.1, or 3.2 with the inspectorate you want to appoint.

Quotations for 1.4886 forgings are normally returned within one working day. Send drawings to sales@steelforgepieces.com or reach the sales office on +86 189 2135 9659. WhatsApp and WeChat are on the same number.

Section 11Frequently asked questions about 1.4886

Section 12Related heat-resisting and nickel alloy forgings

Grades frequently compared with or specified alongside 1.4886:

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