Petrochemical Corrosion Resistant Alloys UNS N06230 / INCONEL® N06230 Nickel Based

Corrosion resistant alloy (CRA) UNS N06230, INCONEL® N06230, W.Nr.2.4733, HAYNES® 230 for petrochemical

PRODUCT:

Corrosion resistant alloy (CRA) UNS N06230, INCONEL® N06230, W.Nr.2.4733, HAYNES® 230 for petroleum processing

PRODUCT FORM:

Forgings, plate, sheet, strip, tube and pipe, pipe fitting, bar, rod, etc.

MATERIAL:

UNS N06230

EQUIVALENT DESIGNATION:

Alloy 230, INCONEL® N06230, W.Nr.2.4733, HAYNES® 230

OVERVIEW

UNS N06230 is a carbide strengthened nickel-chromium-tungsten-molybdenum alloy with an exceptional combination of strength, stability, and resistance to corrosion at very high temperatures. Alloy N06230 offers particularly good resistance to oxidation at temperatures greater than 1800℉(980℃). It also offers good resistance to carburization and nitridation.

The alloy is nickel-base. Chromium imparts resistance to high temperature corrosion. Oxidation is further enhanced by a micro-addition of the rare earth element, lanthanum. Tungsten and molybdenum in conjunction with the alloy's high carbon content are largely responsible for the strength of the alloy. The creep resistance of alloy N06230 is optimized by control of the boron content.

The combination of high temperature strength and resistance to creep, stress rupture, and corrosion make the alloy attractive for service at temperatures above 1800℉(980℃).

MAIN APPLICATION

Potential applications include equipment and components for land-based gas turbines, thermal and petrochemical processing, heat treating, and ore and metal refining.

Alloy 230 combines properties which make it ideally suited for a wide variety of component applications in the aerospace and power industries. It is used for combustion cans, transition ducts, flame holders, thermocouple sheaths, and other important gas turbine components.

In the chemical process industry, alloy 230 is used for catalyst grid supports in ammonia burners, high-strength thermocouple protection tubes, high-temperature heat exchangers, ducts, high-temperature bellows, and various other key process internals.

In the industrial heating industry, applications for alloy 230 include furnace retorts, chains and fixtures, burner flame shrouds, recuperator internals, dampers, nitriding furnace internals, heat-treating baskets, grates, trays, sparger tubes, thermocouple protection tubes, cyclone internals, and many more.

STANDARD SPECIFICATION

ASTM B366 / ASME SB366 for nickel and nickel alloy fittings

ASTM B435 / ASME SB435 for plate, sheet and strip

ASTM B472 / ASME SB472 for nickel alloy billet and bar for reforging

ASTM B564 / ASME SB564 for nickel alloy forgings

ASTM B572 / ASME SB572 for rod

ASTM B619 / ASME SB619 for welded nickel and nickel-cobalt alloy pipe

ASTM B622 / ASME SB622 for seamless nickel and nickel-cobalt alloy pipe and tube

ASTM B626 / ASME SB626 for welded nickel and nickel-cobalt alloy tube

ASTM B751 / ASME SB751 for Nickel and Nickel Alloy Welded Tube

ASTM B775 / ASME SB775 for Nickel and Nickel Alloy Welded Pipe

ASTM B906 / ASME SB906 for plate, sheet and strip

SAE AMS 5878 Nickel Alloy, Corrosion Heat-Resistant, Sheet, Strip, Plate, 59Ni - 22Cr - 2Mo - 14W - 0.35AI - 0.03la, Solution Heat Treated

SAE AMS 5891 nickel alloy, corrosion and heat resistant, bars, forgings, and rings 60ni - 22cr - 2.0mo - 14w - 0.35al - 0.03la annealed

CHEMICAL COMPOSITION (wt%):

Table 1

PHYSICAL PROPERTIES

Density: 8.91 g/cm³

Melting point: 1360-1410℃

MECHANICAL PROPERTIES

Alloy N06230 products exhibit excellent mechanical properties over a broad range of temperatures. The alloy’s strength at temperatures greater than 1800℉(980℃) is of particular importance to designers and engineers. Alloy N06230’s resistance to high temperature corrosion in conjunction with high strength enhances its usefulness.

TENSILE STRENGTH

Typical values for tensile and yield strength and elongation are compared to specified requirements in Table 2. 

Table 2 Room temperature properties of hot-rolled / annealed plate

IMPACT

Impact properties (determined at room temperature) of hot-rolled / annealed plate are reported in Table 3. Tests were conducted with material from both rolling orientations. The test specimens were charpy V notch sub-size specimens (10 mm x 5 mm).

Table 3 room temperature impact properties of hot rolled / annealed plate

CREEP AND RUPTURE PROPERTIES

Typical values for stress to rupture and rupture ductility are compared to specified requirements in Table 4.

Table 4 stress rupture of hot rolled / annealed plate at 1700℉ and 9 ksi

MICROSTRUCTURE

Alloy N06230 has a fully austenitic structure. By virtue of the alloy’s carbon content, the microstructure contains quantities of secondary carbide particles (predominantly M6C and M23C6), which contribute significantly to the alloy’s strength. The carbide particles exhibit an intragranular distribution; they are not preferentially located on the grain boundaries. In the solution annealed condition, the grain size is typically ASTM No. 6. Figure 1 is a photomicrograph of the microstructure of alloy N06230 plate.

Figure 1 Photomicrograph of alloy N06230

CORROSION RESISTANCE

Alloy N06230 is designed to offer resistance to a variety of corrosion mechanisms at high temperatures. While the alloy’s resistance to carburization and nitridation is exemplary, its resistance to oxidation at temperatures over 2000℉ (1093℃) is unsurpassed by any other conventional, high strength alloy. The response to exposure of various alloys to oxidizing environments at 1000, 1100 and 1200℃ (1832, 2012 and 2192℉) is shown in Figures 2, 3 and 4. (Environments as indicated. All samples cycled to room temperature once per week.)

Figure 2 Oxidation resistance at 1000℃ (Air + 5% water vapor).

Figure 3 Oxidation resistance at 1100℃ (Air + 5% water vapor).

Figure 4 Oxidation resistance at 1200℃ ((Laboratory air).

COMPETITIVE ADVANTAGE:

(1) More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Hundreds of patent technologies.
(4) Excellent performance when running in oil-gas well several tens of thousands of meters deep.

(5) We have terminal customers like Baker Hughes, Halliburton, SINOPEC, etc.

DESCRIPTION:

BUSINESS TERM