Incoloy 825 Round Bar Supplier in India — ASTM B425 | UNS N08825

Corrosion-resistant nickel-iron-chromium alloy round bars — ex-stock in Mumbai, exported worldwide.

Standard ASTM B425 / ASME SB425 Certified
Material UNS N08825 / WNR 2.4858
Size Range 3 mm to 800 mm Round Bar Diameter
Forms Round Bar, Hex Bar, Square Bar, Flat Bar
Certificate EN 10204 3.1 / 3.2 Mill Test Certificate
Export Global Export to 25+ Countries
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Incoloy 825 Round Bar

Unifit Fastener is a reputed Incoloy 825 round bar supplier & manufacturer in India and around the globe used in chemical processing, oil & gas, marine & pharmaceutical industries. We also provide the full range of related items such asIncoloy 825 fasteners and Incoloy 825 tube plugs, conforming to ASTM B425 and ASME SB425 with UNS No.8825 and Werkstoff No.2.4858. Our Incoloy 825 round bars offer exceptional pitting, crevice corrosion and chloride-ion stress corrosion cracking resistance and superior resistance to sulphuric and phosphoric acids to make it an ideal choice for challenging acid processing and marine applications. Oftentimes, this grade is compared with Incoloy 800 & 800HT round bar and Inconel 625 round bar for high temperature and higher strength applications. Every batch supplied to you is guaranteed by 100% traceable chemical and mechanical testing, third party inspection reports and 100% guarantee of full mill test certificates and the bar shape is available in a variety of configurations, diameters and lengths to suit your exact requirement, round, hex, square and flat bar from 3 mm to 800 mm diameter. From a small trial order to a bulk shipment, Unifit Fastener provides the reliability engineers, EPC contractors, and procurement teams are looking for with our in-house stock, competitive pricing, and quick turnaround.

Explore our full round bars range or contact our sales team for a tailored quote.

What is Incoloy 825 Round Bar?

Incoloy 825 (UNS N08825, Werkstoff 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium, engineered to resist a wide range of corrosive environments. Unlike standard stainless steel round bar grades, Incoloy 825 offers superior resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-bearing media, along with excellent resistance to both reducing and oxidizing acids. The round bar form is produced through melting, hot working, and cold finishing, followed by solution annealing to achieve a stable, single-phase austenitic structure. For higher-temperature service, customers can also compare our Incoloy 800/800HT round bar and duplex steel round bar ranges.

Technical Specifications

Specification

Parameter Details

Standard

ASTM B425 / ASME SB425

UNS Designation

N08825

Werkstoff Number (WNR)

2.4858

Other Standards

ASTM B163, B564, B423, B751, B775, B424, B704, B705, B366, B829

Form

Round Bar, Hex Bar, Square Bar, Flat Bar

Diameter Range

3 mm – 800 mm

Hex Bar

3 mm – 180 mm

Flat Bar

Thickness 0.5–200 mm, Width 1.5–250 mm

Square Bar

2 mm – 200 mm

Length

0.5 m – 6 m (cut length available)

Supply Condition

Hardened, Annealed, Turned & Rough

Surface Finish

Black, Peeled, Polished, Bright, Pickled

Origin Available

Indian, European, Japanese, Korean, American

Certification

MTC EN 10204 3.1 / 3.2, Third-Party Inspection, PMI Test

Chemical Composition (Incoloy 825 / UNS N08825)

Element Symbol Min % Max %

Nickel

Ni

38.00

46.00

Chromium

Cr

19.50

23.50

Iron

Fe

22.00 (min)

Balance

Molybdenum

Mo

2.50

3.50

Copper

Cu

1.50

3.00

Titanium

Ti

0.60

1.20

Aluminium

Al

-

0.20

Carbon

C

-

0.05

Manganese

Mn

-

1.00

Silicon

Si

-

0.50

Sulphur

S

-

0.03

Mechanical Properties (Annealed Condition, Room Temperature)

Property Value

Tensile Strength

min 85 ksi (586 MPa)

Yield Strength (0.2% Offset)

min 35 ksi (241 MPa)

Elongation

min 30%

Hardness

35 HRC max

Density

8.14 g/cm³ (0.294 lb/in³)

Melting Point

1,370°C – 1,400°C (2,500°F – 2,550°F)

Incoloy 825 Round Bar Size Chart

ASTM / Canadian Bar Size Diameter (mm²) Metric Diameter (mm) US Bar Size Diameter (inch)

10M

100

5

#2

0.250

15M

200

5.5

#3

0.375

20M

300

6

#4

0.500

25M

500

7

#5

0.625

30M

700

8

#6

0.750

35M

1000

9

#7

0.875

45M

1500

10

#8

1.000

55M

2500

11

#9

1.125

-

-

12

#10

1.250

-

-

14

#11

1.375

-

-

16

#12

1.500

Heat Treatment Options

Heat Treatment Temperature Range

Annealing

900–1150°C (1652–2102°F)

Solution Heat Treatment

1050–1100°C (1922–2012°F)

Stress Relief Annealing

650–750°C (1202–1382°F)

Age Hardening

650–750°C (1202–1382°F)

Welding Heat Treatment

700–800°C (1292–1472°F)

 Comparison Table: Incoloy 825 vs Incoloy 800/800HT vs Inconel 625

Property Incoloy 825 Incoloy 800/800HT Inconel 625

UNS

N08825

N08800 / N08811

N06625

Primary Strength

Corrosion resistance

High-temp oxidation resistance

Extreme heat + corrosion

Max Service Temp.

~550°C

~1100°C

~980°C

Tensile Strength

586 MPa min

520–650 MPa typical

827–1,100 MPa

Best Suited For

Sulphuric/phosphoric acid, chloride SCC resistance

Furnace components, heat treatment fixtures

Exhaust systems, marine, chemical processing

Magnetic

Non-magnetic

Non-magnetic

Non-magnetic

See also our detailed comparison guide: ‘Advantages of Nickel Alloy Fasteners’ for more grade-selection guidance. You may also browse Hastelloy round bar and Monel round bar as alternative high-performance corrosion-resistant options.

Applications / Industries

  • Chemical & Petrochemical Processing — pumps, valves, reactor vessels
  • Oil & Gas — downhole tubing, wellhead components, acid handling equipment
  • Marine & Offshore Applications — seawater exposed components
  • Power Generation and Heat Treatment Equipment
  • Food Processing and Pharmaceutical Industries — hygienic, corrosion-resistant parts
  • Sulphuric acid and phosphoric acid production plants
  • Pollution control and acid pickling equipment

 Manufacturing Process & Quality Control

Manufacturing Process

  • Raw material melting → Ingot casting → Hot forging/rolling
  • Solution annealing at 1050–1100°C for a stable austenitic structure
  • Straightening, centreless grinding, peeling, or polishing to finish
  • Cutting to length, marking, and packing for dispatch

Quality Control & Testing

  • Tensile testing
  • Hardness testing
  • Impact testing
  • Corrosion testing
  • Dimensional testing
  • Ultrasonic testing
  • Destructive and non-destructive testing, PMI

Certifications & Standards

  • ASTM B425 / ASME SB425
  • ASTM B163, B564, B423, B751, B775, B424, B704, B705, B366, B829
  • NACE MR0175 / ISO 15156
  • BS 3076NA16, DIN 17752, ISO 9723 / 9724 / 9725
  • ISO 9001:2015 Quality Management System
  • EN 10204 3.1 & 3.2 Mill Test Certificates

Frequently Asked Questions (FAQ Section)

What is Incoloy 825 round bar?

Incoloy 825 round bar is a nickel-iron-chromium alloy bar (UNS N08825, Werkstoff 2.4858) with additions of molybdenum, copper, and titanium, offering excellent resistance to pitting, crevice corrosion, and chloride-ion stress corrosion cracking. It is produced under ASTM B425 / ASME SB425 specifications.

What is the standard size range of Incoloy 825 round bar?

Unifit Fastener stocks Incoloy 825 round bar from 3 mm to 800 mm in diameter, hex bar from 3 mm to 180 mm, and flat/square bar in a wide range of thicknesses and widths, with custom cut lengths on request.

What is the chemical composition of Incoloy 825?

Incoloy 825 primarily contains 38–46% nickel, 19.5–23.5% chromium, minimum 22% iron, 2.5–3.5% molybdenum, 1.5–3% copper, and 0.6–1.2% titanium, giving it its distinctive corrosion resistance.

What industries use Incoloy 825 round bar?

Incoloy 825 round bars are widely used in chemical and petrochemical processing, oil and gas production, marine and offshore equipment, power generation, food processing, and pharmaceutical industries.

Is Incoloy 825 round bar magnetic?

No, Incoloy 825 is non-magnetic due to its stable austenitic nickel-iron-chromium structure.

Incoloy 825 vs Incoloy 800 — what is the difference?

Incoloy 800/800HT is primarily an oxidation-resistant, high-temperature alloy suited to furnace and heat-treatment applications, offering higher tensile strength and hardness. Incoloy 825 is optimised for corrosion resistance in acidic and chloride-bearing environments and is the better choice for chemical processing and marine service.

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