Inconel 718 Round Bar Supplier | ASTM B637 UNS N07718 Bar Stock in India

Name: Inconel 718 Round Bar
Brand: Solitaire Overseas
SKU: UNS N07718
Availability: InStock

Inconel 718 Round Bars Manufacturer, Supplier & Exporter in India

Solitaire Overseas is a leading Inconel 718 round bars manufacturer, supplier, and exporter in India. We supply premium Alloy 718 bar stock to ASTM B637 / ASME SB637 and AMS 5662 / AMS 5663 standards covering UNS N07718 round bars, hex bars, flat bars, and forged bar in diameters from 3 mm to 500 mm. Our bars deliver exceptional tensile strength, superior oxidation resistance, and reliable mechanical performance from cryogenic temperatures up to 704°C (1,300°F), making them the material of choice for aerospace, oil & gas, power generation, and marine applications.

High-performance Inconel 718 round bars are nickel-chromium superalloys renowned for exceptional mechanical strength and corrosion resistance. Manufactured to ASTM B637 standards, they are available in hot-worked and cold-worked precipitation-hardened versions intended for high-temperature service. UNS N07718 has a carefully controlled chemistry that guarantees stability and durability even in the most extreme operating conditions.

The precipitation hardening process substantially increases the tensile strength of the alloy. Trace elements added to the nickel-niobium matrix during the aging cycle form a gamma double prime (γ″) phase, greatly enhancing tensile strength and corrosion resistance. These characteristics make Inconel 718 round bars ideal for severe industrial applications where material failure is not an option.

The alloy excels in aerospace applications due to its superior creep and oxidation resistance. A stable passive oxide layer on its surface provides additional durability at high temperatures. Inconel 718 is equally established in marine engineering, gas turbines, and nuclear applications where strength, reliability, and long service life are paramount.

Solitaire Overseas has supplied Inconel 718 bar stock to clients across 50+ countries, backed by EN 10204 3.1 MTCs, full PMI test records, and optional third-party inspection from TÜV, DNV, or Lloyd’s Register. Contact us today for premium-quality Inconel 718 round bars at competitive prices with reliable global delivery.

For our full range of nickel alloy bar stock across all grades, visit our Inconel Round Bars page.

Inconel 718 Round Bar Suppliers · ASTM B637 Inconel UNS N07718 Bright Bar · 718 Inconel Round Bar · Inconel Alloy 718 Forged Round Bar · 718 Inconel Alloy Hex Bars · Inconel 718 Cold Finished Bars Suppliers in India · Alloy 718 Forged Bar Stock · Inconel 718 bar stock

Request a Quote!

What is Inconel 718 Round Bar?
Inconel 718 Round Bar Specifications
Inconel 718 Bar Chemical Composition
Inconel 718 Bar Mechanical Properties
Inconel 718 Round Bar Heat Treatment — AMS 5662 vs AMS 5663
Inconel 718 Round Bar Equivalent Grades & Standards
UNS N07718 Round Bar Size Chart
Inconel Alloy 718 Round Bar Stock Sizes
HS Code of Inconel 718 Bar
Alloy Inconel 718 Hex Bar Weight Chart
Inconel 718 Round Bar Weight Per Metre Chart
Nickel Alloy 718 Round Bar Tolerances
Forms of Inconel 718 Bar
Applications of Inconel 718 Round Bars
Why Engineers Specify Inconel 718 Bar Stock
Related Products
FAQs about Inconel 718 Round Bars

What is Inconel 718 Round Bar?

Inconel 718 Round Bar is a solid cylindrical bar made from the nickel-chromium superalloy UNS N07718, offering outstanding strength and durability for extreme-condition service. It is composed of nickel, chromium, molybdenum, titanium, iron, aluminium, and columbium (niobium), delivering best-in-class corrosion resistance and high-temperature performance up to 704°C (1,300°F) in continuous service, and reliable performance at cryogenic temperatures as low as −253°C (−423°F).

Inconel 718 is widely specified for turbine blades, jet engine components, rocket motors, control rods, airframe structures, and cryogenic storage tanks. Round bars are used across aerospace, marine, chemical processing, and military industries to manufacture gears, shafts, axles, flywheels, and seamless pipes.

Available in round, hex, flat, and square bar forms, Inconel 718 bar stock conforms to ASTM B637, ASME SB637, AMS 5662, AMS 5663, UNS, and EN standards, with diameters from 0.5 mm to 500 mm and lengths from 50 mm to 6,000 mm.

Inconel 718 Round Bar Specifications

These specifications highlight the key standards, dimensions, and characteristics of Inconel 718 round bars to ensure optimal performance in high-temperature and corrosion-resistant applications.

Specification	Details
Specification	ASTM B637 / ASME SB 637
UNS Designation	N07718
Werkstoff Nr.	2.4668
AMS Standards	AMS 5662 (Annealed), AMS 5663 (Precipitation Hardened), AMS 5596, AMS 5597
Other Standards	SAE AMS 5962, NACE MR0175 / ISO 15156
Forms	Round, Square, Hex, Flat, Forged, Rectangle, Billet
Round Bar Sizes	3 mm to 500 mm Diameter
Square Bar Sizes	18 mm to 47 mm
Hex Bar Sizes	18 mm to 57 mm
Flat Bar Sizes	12.7 mm to 254 mm Width, 2 mm to 150 mm Thickness
Length	1 to 6 metres; Custom Cut Lengths available
Finish Available	Hot Rolled, Cold Drawn, Bright Annealed, Pickled, Polished, Black
Condition	Hot Rolled, Cold Drawn, Annealed, Precipitation Hardened, Forged

Chemical Composition of Inconel 718 Round Bar

The chemical composition table provides the percentage of each element present in Inconel 718 bars and its functional role in the alloy, ensuring full compliance with ASTM B637 and AMS 5662 / 5663 standards.

Element	Content (%)	Role in Alloy
Nickel (Ni)	50.00–55.00	Primary base element — provides corrosion resistance & high-temperature strength
Chromium (Cr)	17.00–21.00	Forms stable protective oxide layer — delivers oxidation & hot corrosion resistance
Columbium / Niobium (Nb+Ta)	4.75–5.50	Key strengthener — forms γ″ (gamma double prime) phase via precipitation hardening
Molybdenum (Mo)	2.80–3.30	Solid-solution strengthener — pitting & crevice corrosion resistance
Titanium (Ti)	0.65–1.15	Supports precipitation hardening response; forms γ′ (gamma prime) phase
Aluminum (Al)	0.20–0.80	Oxidation resistance at elevated temperatures; contributes to γ′ formation
Cobalt (Co)	1.00 max	Solid-solution strengthener at high temperatures
Carbon (C)	0.08 max	Controlled at low level to preserve weldability and ductility
Manganese (Mn)	0.35 max	Deoxidiser during melting; maintained at low level
Silicon (Si)	0.35 max	Deoxidiser; controlled to avoid embrittlement
Phosphorus (P)	0.015 max	Strictly controlled; excess reduces ductility and toughness
Sulfur (S)	0.015 max	Strictly controlled; excess causes hot cracking during welding
Boron (B)	0.006 max	Grain boundary strengthener; improves stress rupture life
Copper (Cu)	0.30 max	Controlled to prevent corrosion issues in certain environments

Mechanical Properties of Inconel 718 Round Bar

Inconel 718 round bars are available in two primary heat treatment conditions. The table below compares mechanical properties under Annealed — AMS 5662 and Precipitation Hardened — AMS 5663 to support accurate material selection.

Property	Annealed — AMS 5662	Precipitation Hardened — AMS 5663
Tensile Strength	≥1,000 MPa / ≥145 ksi	≥1,379 MPa / ≥200 ksi
0.2% Yield Strength	≥655 MPa / ≥95 ksi	≥1,172 MPa / ≥170 ksi
Elongation at Break	≥30%	≥12%
Reduction of Area	≥35%	≥15%
Hardness	≤36 HRC	≤40 HRC
Density	8.19 g/cm³	8.19 g/cm³
Modulus of Elasticity	200 GPa / 29,000 ksi
Melting Range	1,260–1,336°C / 2,300–2,437°F

Need Inconel 718 bar stock certified to AMS 5662 or AMS 5663?

Our technical team responds within 24 hours with a detailed quotation and full MTC documentation.

Get a Quote

Inconel 718 Round Bar Heat Treatment — AMS 5662 vs AMS 5663

Inconel 718 bar stock is supplied in two primary heat treatment conditions: Annealed (AMS 5662) for maximum ductility and weldability, and Precipitation Hardened (AMS 5663) for maximum tensile and yield strength. The two-step ageing process — 718°C for 8 hrs, then 621°C for 8 hrs — develops the gamma double prime (γ″) phase responsible for the alloy’s exceptional strength without sacrificing resistance to post-weld cracking.

Type	Process Details
Solution Treatment (Anneal) — AMS 5662	Heat to 1,700°–1,850°F (927°–1,010°C), then air cool or faster. Produces a fully annealed, ductile microstructure suitable for forming and welding.
Precipitation Hardening — AMS 5663	Heat to 1,325°F (718°C) for 8 hours, furnace cool to 1,150°F (621°C) and hold for a total ageing time of 18 hours. Air cool. Develops maximum γ″ phase for peak tensile and yield strength.

Inconel 718 Round Bar Equivalent Grades & Standards

Use this table to match Inconel 718 to global material designation systems for international procurement and engineering documentation.

Trade Name	UNS	Werkstoff Nr.	AMS	JIS	BS	AFNOR	ASTM / ASME
Inconel 718	N07718	2.4668	5662 / 5663	NCF 718	NA 51	NC19FeNb	B637 / SB637

UNS N07718 Round Bar Size Chart

Find all available sizes and dimensions of UNS N07718 round bars in this chart for easy reference during selection and procurement.

Diameter (Inch)	Bar Size	Diameter (mm)	Bar Size
0.250″	#2	6 mm	6
0.375″	#3	8 mm	8
0.500″	#4	10 mm	10
0.625″	#5	12 mm	12
0.750″	#6	16 mm	16
0.875″	#7	20 mm	20
1.000″	#8	25 mm	25
1.125″	#9	28 mm	28
1.250″	#10	32 mm	32
1.375″	#11	35 mm	35
1.750″	#14	44 mm	44
2.250″	#18	57 mm	57

Inconel Alloy 718 Round Bar Stock Sizes

Standard stock sizes for Alloy 718 round bars and related profiles, available in Indian, European, and Japanese make.

Material	Diameter / Size	Length	Make
Inconel 718 Round Bar	0.5 mm to 500 mm	50 mm to 6,000 mm	Indian, European, Japanese
Inconel 718 Flat Bar	As per requirement	As per requirement	Indian, European, Japanese
Inconel 718 Hex Bar	As per requirement	As per requirement	Indian, European, Japanese
Inconel 718 Square Bar	As per requirement	As per requirement	Indian, European, Japanese

HS Code of Inconel 718 Bar

Product Description	HS Code
Inconel 718 Bar	75051220

Thickness Chart of Alloy Inconel 718 Hex Bar

Thickness (inch)	Weight (Kgs / Mtr)
1/8″	0.0062
1/4″	0.0248
1/2″	0.0992
6 mm	0.0223
8 mm	0.0398
10 mm	0.0620
12 mm	0.0889
15 mm	1.0391

Inconel 718 Round Bar Weight Per Metre Chart

Approximate weight per metre for standard Inconel 718 round bar diameters, calculated at density 8.19 g/cm³ as per ASTM B637. For exact weights on non-standard sizes, contact our technical team.

Diameter (mm)	Weight (kg/m)	Diameter (mm)	Weight (kg/m)
10 mm	0.617	50 mm	15.41
20 mm	2.467	60 mm	22.19
25 mm	3.854	75 mm	34.67
30 mm	5.549	100 mm	61.63
40 mm	9.865	150 mm	138.7

Nickel Alloy 718 Round Bar Tolerances

Permissible dimensional tolerances for Inconel 718 round bars, ensuring proper fit and precision in manufacturing.

Condition	Diameter Specification	Tolerance (over/under)
Hot Rolled	Up to 1″ incl.	+/− 0.016″
Hot Rolled	Over 1″ to 2″ incl.	+ 0.031″ / − 0.016″
Hot Rolled	Over 2″ to 4″ incl.	+ 0.047″ / − 0.031″
Hot Rolled	Over 4″	+ 0.125″ / − 0.063″

Forms of Inconel 718 Bar

Inconel 718 Round Bar

Alloy 718 Flat Bar

Nicrofer 5219 Square Bar

DIN 2.4668 Rectangle Bar

Nickel 718 Bright Bar

Werkstoff 2.4668 Cold Drawn Bar

UNS N07718 Forged Bar

Inconel 2.4668 Polished Bar

Applications of Inconel 718 Round Bars

Aerospace: Jet engine components, gas turbine parts, rocket motors, airframe structures, and fasteners.
Oil & Gas: NACE MR0175 Compliant: Downhole shafts, wellhead parts, valves, and pump components in sour service environments per NACE MR0175 / ISO 15156.
Chemical Processing: High-temperature reactor vessels, pressure vessels, and piping systems.
Power Generation: Gas turbine discs, blades, and high-temperature bolting for power stations.
Marine Engineering: Submarine components, propeller shafts, and high-strength structural parts.
Nuclear: Reactor core components, control rod mechanisms, and cryogenic storage equipment.

Why Engineers Specify Inconel 718 Bar Stock

ISO 9001:2015 Certified EN 10204 3.1 MTCs 100% PMI Testing 50+ Countries TÜV / DNV / Lloyd’s Inspection Available

Specialist expertise in precipitation-hardenable superalloys — our metallurgical team can advise on condition, form, and tolerance requirements for your specific application.
Competitive pricing through efficient production and global sourcing across all Alloy 718 bar stock product forms.
Full certification — every Inconel 718 Bar is supplied with a Mill Test Certificate (MTC) to EN 10204 3.1, guaranteeing chemical and mechanical compliance.
Flexible supply — material available in annealed (AMS 5662) or aged (AMS 5663) condition, in round, hex, square, flat, and forged bar forms.
Global logistics — as an experienced exporter, we manage all documentation and freight for fast, reliable delivery worldwide in 3–7 working days.
PMI testing on every heat — positive material identification records supplied as standard, a differentiator not offered by all distributors.
Third-party inspection available from TÜV, DNV, or Lloyd's Register on request.

FAQs about Inconel 718 Round Bars

What is the ASTM standard for Inconel 718 round bars?

Inconel 718 round bars are manufactured to ASTM B637 / ASME SB637. AMS 5662 covers the annealed condition and AMS 5663 the precipitation-hardened condition.

What is the difference between Inconel 718 bar in annealed vs. precipitation hardened condition?

Annealed (AMS 5662) offers greater ductility and is preferred for forming or welding. Precipitation hardened (AMS 5663) delivers maximum tensile strength (≥1,379 MPa) for finished components in aerospace and oil & gas.

What is the maximum service temperature of Inconel 718 round bar?

Inconel 718 bar retains full mechanical properties up to 704°C (1,300°F) in continuous service and performs reliably at cryogenic temperatures down to −253°C (−423°F).

Is Inconel 718 bar NACE MR0175 compliant for sour service?

Yes. UNS N07718 is listed in NACE MR0175 / ISO 15156 for use in sour oil and gas environments, making it a go-to material for downhole and wellhead applications.

What sizes of Inconel 718 round bar do you stock?

We stock 3 mm to 500 mm diameter in standard and cut-to-length options. Hex, flat, square, and forged bars also available.

What is Inconel 718 used for?

Inconel 718 is used where high strength, corrosion resistance, and heat tolerance are essential — commonly in aerospace components, gas turbines, pressure vessels, downhole oil & gas equipment, and chemical processing plant.

Is Inconel 718 approved for use in pressure vessels?

Yes. Inconel 718 meets the requirements of the ASME Boiler & Pressure Vessel Code for pressure vessel applications.

Get Your Inconel 718 Round Bar Price Today

Request a quote from Solitaire Overseas — India’s trusted Inconel 718 bar stock supplier. Competitive pricing, EN 10204 3.1 MTCs, and global delivery in 3–7 working days. All material certified to ASTM B637 and AMS 5663.

Enquire Now