Incoloy 825 Plate

Q: Can Incoloy 825 plate be welded easily, and what filler metal is required?

Oui ,Incoloy 825 exhibits excellent weldability using standard processes like GTAW/TIG,GMAW/MIG,and SMAW/Stick.Because it is stabilized with titanium,it resists intergranular corrosion in the weld HAZ. It is typically welded using Alloy 625 filler metals (such as ERNiCrMo-3 bare wire or ENiCrMo-3 covered electrodes).This over-alloyed filler ensures the weld joint matches or exceeds the corrosion resistance of the base 825 plate.

Q: Does Incoloy 825 plate comply with NACE standards for oil and gas applications?

Oui. When properly solution-annealed and processed,Incoloy 825 plates fully comply with NACE MR0175 / ISO 15156 requirements.It is widely approved for use in downstream,midstream,and upstream “sour service” environments where high levels of H 2 S, CO 2 ,and chlorides are present.

Un Incoloy 825 plate is a flat-rolled,industry-grade superalloy panel made of a nickel-iron-chromium blend infused with copper, molybdenum,and titanium.It is universally designated as UNS N08825 and governed by the ASTM B424 standard specification.This specialty metal plate is designed primarily to withstand severe,highly acidic,and corrosive operational environments that quickly degrade standard stainless steel.

Key Performance Properties

Exceptional Acid Resistance:
It stands as one of the most reliable and budget-conscious superalloys for containing concentrated sulfuric and phosphoric acids.
Temperature Stability:
It retains its mechanical durability and structural toughness from cryogenic levels up to 1000°F (538°C).Exposure above this point can slightly alter its microstructure and lower impact strength.
Non-Magnetic Behavior:
The material is entirely non-magnetic when left in its mill-annealed state.

Applications of Incoloy 825 Plate

We offer Incoloy 825 plates and sheets in thicknesses of 1.5, 1.9, 2.0, 2.7, 3.0, 5.0, 12.5, 12.7, and 16.We offer not only plaques en acier inoxydable and sheets but also plates made of Hastelloy,Incoloy,Inconel,Monel,and other alloys.Our products comply with ASTM A240,EN 10204,ISO 9001,PED 2014/68/EU ,CE,and other standards.With over a decade of experience in manufacturing and import/export,we are your best wholesaler in China.

Chemical Composition of Incoloy 825 Plate

The chemical composition of Incoloy 825 plate is meticulously balanced to bridge the gap between conventional stainless steels and high-cost,nickel-base superalloys.

Ni	Fe	Cr	Mo	Cu	Ti	Mn	C	Si	S
38,0 – 46,0	≥ 22.0	19,5 – 23,5	2.50 – 3.50	1.50 – 3.0	0.60 – 1.20	≤ 1.0	≤ 0.05	≤ 0.50	≤ 0.03

Metallurgical Insights & Synergies

The Copper-Molybdenum Synergy:
The simultaneous inclusion of copper and molybdenum is highly unusual for general nickel alloys.Together,they create an incredibly robust barrier against highly reducing acids,making Incoloy 825 the industrial standard for boiling sulfuric acid solutions up to 40% concentration.
Titanium Stabilization:
When steel or nickel alloys are welded,heat causes carbon to bind with chromium,depleting the chromium at the grain boundaries.Because Incoloy 825 contains titanium,the carbon preferentially binds to the titanium instead,forming harmless titanium carbides.This allows the plate to be welded without losing its corrosion resistance.

Comparative Analysis: Incoloy 825 Plate VS. Peers

VS. 316L Stainless Steel:
316L contains only about 10–14% Nickel.Incoloy 825’s 38–46% Nickel content makes it virtually immune to chloride-induced stress corrosion cracking,a major failure point for 316L in marine environments.
VS. Inconel 625:
Inconel 625 scales up the Nickel content to over 58% and drops Iron to under 5%.While Inconel 625 handles much higher temperatures (＞ 1000℉),Incoloy 825 is significantly more cost-effective for wet chemical environments due to its higher iron content.

Incoloy 825 Standards & Equivalent Designations

Incoloy 825 Alloy
Standard / System	Equivalent Designation	Forme du produit	ASTM	ASME	SAE AMS
Numéro UNS	UNS N08825	Plates, Sheets & Strips	ASTM B424	ASME SB424	AMS 5542
DIN / German Werkstoff	W.Nr. 2.4858	Bars, Rods, Wires & Shapes	ASTM B425	ASME SB425	AMS 5719
EN Chemical Name	NiCr21Mo	Seamless Pipes & Tubes	ASTM B423	ASME SB423	–
JIS	NCF 825	Condenser & Heat Exchanger Tubes	ASTM B163	ASME SB163	–
BS	NA 16	Welded Pipes & Tubes	ASTM B704 / B705	ASME SB704 / SB705	–
AFNOR	NC21FeDu	Forgings & Flanges / Fittings	ASTM B564	ASME SB564	–
Generic Trade Name	Alloy 825, Incoloy 825

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Mechanical Properties of Incoloy 825 Plate

The mechanical properties of an Incoloy 825 plate ensure high structural reliability from cryogenic depths up to moderately high industrial temperatures.It features excellent ductility and stable tensile threshold capacities in its standard mill-annealed condition.

Room-Temperature Mechanical Properties

Biens	Minimum Specified	Typical Production Values
Ultimate Tensile Strength	586 MPa (85 ksi)	655 – 689 MPa (95 – 100 ksi)
Limite d'élasticité	241 MPa (35 ksi)	300 – 324 MPa (43.5 – 47 ksi)
Élongation	30%	39 – 45%
Dureté	Max 210 HB / 95 HRB	135 – 165 HB 75 – 85 HRB

Mechanical Design Parameters

Modulus of Elasticity (Young’s Modulus):
28.3 × 10⁶ psi (195GPa) at room temperature.It drops predictably to 26.0 × 10⁶ psi (179GPa) at 800℉.
Poisson’s Ratio:
0.31, which aligns with structural austenitic steel variants.
Shear Modulus:
10.8 × 10⁶ psi (75GPa)

Thanks to its high nickel-iron base, the alloy exhibits a steep work-hardening rate. This means cold rolling or cold pressing the plate heavily scales up its mechanical yield metrics at the expense of ductility, matching heavy cold-forming profiles.

Temperature-Dependent Behavior

The metallurgical composition of Incoloy 825 stabilizes its performance across wide thermal ranges,but with specific operational boundary limits:

Cryogenic Reliability:
At sub-zero and deep cryogenic limits down to -320℉(-196℃),the plate retains high impact toughness and does not experience a sharp ductile-to-brittle transition.Tensile and yield strengths increase slightly at lower temperatures while maintaining favorable elongation.
Elevated Temperature Limit:
Mechanical strength holds stable up to 1000℉(540℃).For pressure vessel fabrication under the ASME Boiler and Pressure Vessel Code, maximum design allowances are capped at 800℉(427℃).
The 1000℉ Microstructural Wall:
Exceeding 1000℉(540℃) introduces internal microstructural phase transformations.It causes the precipitation of harmful secondary phases that significantly drop impact strength,fracture toughness,and ductility.Therefore,it is rarely utilized for creep-rupture dominant operations.

Our Advantages in Manufacturing Incoloy 825 Plate

Vacuum Melting Precision

Our production starts with VIM followed by VAR.This dual-vacuum refining process removes detrimental trace gases to ensure maximum purity.It allows us to control the crucial Titanium-to-Carbon ratio with extreme precision,forming optimal titanium carbides that completely prevent intergranular corrosion and sensitization during your subsequent welding processes.

High-Ratio Thermo Rolling

We utilize heavy-duty rolling mills capable of executing high-reduction-ratio rolling patterns on the alloy slabs.Our controlled thermo-mechanical cooling parameters yield an exceptionally fine and uniform austenitic grain structure (ASTM 5 or finer) across the entire plate.This grain refinement eliminates directional weak points,drastically improving the plate’s isotropic impact toughness and fatigue resistance.

Rapid Quench Annealing

Our heat treatment facility features automated roller-hearth furnaces integrated with high-pressure,water-spray quenching systems.We solution-anneal the plates precisely between 1725°F and 1850°F (940°C to 1010°C),immediately followed by an ultra-fast quench.This rapid cooling locks the molybdenum,copper,and chromium in a complete solid solution,preventing brittle phase precipitation and ensuring peak pitting resistance.

Comprehensive NDT Compliance

Every single plate undergoes a rigorous,multi-stage quality assurance protocol rather than random batch testing.We conduct 100% UT per ASTM A578 Level C to guarantee zero internal laminations or micro-cracks.Furthermore,our plates are fully certified to meet NACE MR0175 / ISO 15156 standards,making them immediately ready for high-stress “sour service” applications.

FAQs About Incoloy 825 Plate

What makes Incoloy 825 different from standard 316L stainless steel?

The primary difference lies in the nickel and iron content.While 316L is an iron-base stainless steel with 10–14% nickel,Incoloy 825 is a nickel-iron-chromium alloy containing 38–46% nickel.This massive boost in nickel makes Incoloy 825 virtually immune to chloride-ion SCC,a common failure mode for 316L in marine and chemical environments.Additionally,Incoloy 825 includes copper,which gives it vastly superior resistance to sulfuric and phosphoric acids compared to 316L.

Can Incoloy 825 plate be welded easily, and what filler metal is required?

Oui,Incoloy 825 exhibits excellent weldability using standard processes like GTAW/TIG,GMAW/MIG,and SMAW/Stick.Because it is stabilized with titanium,it resists intergranular corrosion in the weld HAZ.

It is typically welded using Alloy 625 filler metals (such as ERNiCrMo-3 bare wire or ENiCrMo-3 covered electrodes).This over-alloyed filler ensures the weld joint matches or exceeds the corrosion resistance of the base 825 plate.

Does Incoloy 825 plate comply with NACE standards for oil and gas applications?

Oui.When properly solution-annealed and processed,Incoloy 825 plates fully comply with NACE MR0175 / ISO 15156 requirements.It is widely approved for use in downstream,midstream,and upstream “sour service” environments where high levels of H₂S, CO₂,and chlorides are present.

How does Incoloy 825 compare to Inconel 625?

Composition & Cost:
Inconel 625 is a higher-grade,more expensive alloy with over 58% nickel and no iron base requirement.Incoloy 825 contains 38-46% nickel and ~22% iron minimum,making it much more cost-effective.
Performance:
Inconel 625 is designed for extreme high-temperature strength (up to 1800°F) and severe high-temperature oxidation.Incoloy 825 is a specialized “wet corrosion” alloy,meaning it outperforms or equals 625 in specific acidic environments (like sulfuric acid) at lower temperatures,but at a much lower material cost.

How do I order your Incoloy 825 plates?

To place an order,please provide the required thickness,width,length,quantity,and the applicable specification.Please specify if you require NACE MR0175 certification for your project.We have Incoloy 825 plates in stock in thicknesses of 1.5, 1.9, 2.0, 2.7, 3.0, 5.0, 12.5, 12.7, and 16.If you need a different thickness, we can also provide custom solutions,please contactez-nous immediately.

What packaging is used when shipping your Incoloy 825 plates?

Our plates are securely packed using waterproof paper wrap,steel banding straps,and heavy-duty wooden pallets or crates.This robust packaging fully protects the surface and edges during international sea freight.

Incoloy 825 Plate