Inconel 625 Round Bar | ASTM B446 UNS N06625

Name: Inconel 625 Round Bar
Brand: Solitaire Overseas
SKU: UNS N06625
Availability: InStock

ASTM B446 / ASME SB446 UNS N06625 Rod — Inconel 625 Round Bar Supplier, Manufacturer & Exporter in India

Inconel 625 round bar (UNS N06625, DIN 2.4856) is a nickel-chromium-molybdenum-niobium superalloy bar produced to ASTM B446 / ASME SB446 standards. Solid-solution strengthened by the addition of niobium and molybdenum to the nickel-chromium matrix, alloy 625 round bar delivers outstanding resistance to aqueous corrosion, pitting, crevice attack, and chloride-induced stress-corrosion cracking across a service temperature range from cryogenic (−196 °C) to 982 °C. Solitaire Overseas stocks Inconel 625 bar stock in diameters from 3 mm to 600 mm, supplied in round, hex, flat, and square profiles with full EN 10204 3.1 material test certificates. As an established Inconel 625 round bar supplier and exporter in India, we serve buyers in the aerospace, oil and gas, chemical processing, marine, and nuclear sectors across 50+ countries.

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Specifications Chemical Composition Mechanical Properties Equivalent Grades Types of Inconel 625 Round Bars Heat Treatment Machining & Welding Diameter & Weight Reference Dimensional Tolerances Surface Finish Thermal & Physical Properties HS Code Applications Test Certificates Packaging Why Specify Inconel 625? Price List Related Products FAQs

Inconel 625 Round Bar Specifications

Parameter	Details
Grade	Inconel 625 / Alloy 625
UNS No.	N06625
Werkstoff Nr.	2.4856
ASTM Standard	ASTM B446 / ASME SB446
Aerospace Spec (Bar/Rod)	AMS 5540 (bar, rod and wire — bar/rod specification)
Aerospace Spec (Wire)	AMS 5666 (wire only — not applicable to round bar)
Welding Wire Spec	AMS 5837 / ERNiCrMo-3
ASME Code	ASME SB446 (Boilers & Pressure Vessels)
Diameter (Round Bar)	3 mm – 600 mm
Hex Bar (A/F)	2 mm – 100 mm
Flat Bar Width	10 mm – 500 mm
Length	100 mm – 6000 mm; cut-to-length on request
Forms	Round, Square, Hex, Flat, Forged, Bright, Peeled, CG
Certificate	EN 10204 3.1 standard; 3.2 from Bureau Veritas, SGS, Intertek, TÜV on request

AMS Specification Note: AMS 5540 is the correct specification for Inconel 625 bar, rod and wire in aerospace applications. AMS 5666 governs Inconel 625 wire (non-welding) and is not the bar/rod specification. For welding wire, specify AMS 5837 / ERNiCrMo-3.

Inconel 625 — Chemical Composition (ASTM B446)

Element	Ni	Cr	Mo	Nb+Ta	Fe	C	Mn	Si	Al	Ti	S	P	Co
Min (%)	58.0	20.0	8.0	3.15	—	—	—	—	—	—	—	—	—
Max (%)	—	23.0	10.0	4.15	5.0	0.10	0.50	0.50	0.40	0.40	0.015	0.015	1.0

Inconel 625 Round Bar — Mechanical Properties

Property	Annealed — Grade 1	Solution Annealed — Grade 2	Cold-Worked	Unit
Tensile Strength (min.)	827	965	930	MPa
Yield Strength 0.2 % (min.)	414	552	655	MPa
Elongation (min.)	30 %	30 %	—	%
Hardness	≤ 220 HB	≤ 220 HB	—	HB
Density	8.44 g/cm³			g/cm³
Melting Range	1,290 – 1,350 °C			°C
Modulus of Elasticity	207 GPa			GPa
Thermal Conductivity	9.8 W/m·K at 21 °C			W/m·K

Request a Quote for Inconel 625 Round Bar

Need an Inconel 625 round bar with full MTCs? Solitaire Overseas supplies ASTM B446 / ASME SB446 material in diameters 3–600 mm with EN 10204 3.1 and 3.2 certificates. Custom cut lengths, multiple conditions (annealed, cold-drawn, forged). Fast dispatch on stock sizes.

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Inconel 625 Equivalent Grades

Standard	Designation
UNS	N06625
Werkstoff Nr. (DIN)	2.4856
ASME	SB446
AMS (Bar / Rod)	AMS 5540
AMS (Wire)	AMS 5666
AMS (Welding Wire)	AMS 5837 / ERNiCrMo-3
ISO	NW 6625
BS	NA 21
EN	NiCr22Mo9Nb
JIS	NCF 625

Note: ASTM B446 (rod/bar), ASME SB446 (pressure vessel service), ASTM B443 (sheet/plate/strip) — same alloy, different product form standards. ASTM B444 applies to pipe and tube.

Inconel 625 Round Bars Types

AMS 5666 Hex Bar

ASME SB446 Flat Bar

DIN 2.4856 Square Bar

Inconel 625 Rod

Alloy 625 Rectangular Bar

Inconel 625 Bright Bar

ASME SB446 Shaft

ASTM B446 Cold Drawn Bar

Heat Treatment of Inconel 625 Round Bar

Inconel 625 is a solid-solution-strengthened alloy. Unlike precipitation-hardened grades (e.g. Inconel 718), alloy 625 does not require an ageing heat treatment to reach its mechanical properties — its strength is achieved through the addition of niobium and molybdenum to the nickel-chromium matrix during solidification.

Solution Annealing — 980 °C (1,800 °F) minimum

Heat to 980 °C minimum, hold for time proportional to section thickness, then rapid air cool or water quench. This fully dissolves carbides and restores corrosion resistance after forming or welding.

Stress Relieving — 870–925 °C, 2–4 hours

For non-age-hardenable work-hardened bar. Relieves residual stresses without recrystallisation — improving performance in cryogenic and fatigue service. Air cool after hold.

Quenching / Annealing — 927–1038 °C (1,600–1,900 °F)

Standard range per heat treatment charts. Applicable to hex bar and shaped sections as well as round bar.

⚠ Sensitisation Warning: Avoid prolonged exposure in the 650–750 °C range. This precipitates carbides at grain boundaries and reduces corrosion resistance. Solution anneal after any thermal processing in this range.

Treatment	Temperature Range
Quenching / Annealing	1,600–1,900 °F (927–1,038 °C)
Stress Relieving	1,100–1,600 °F (593–900 °C)
Solution Annealing	2,000–2,200 °F (1,093–1,204 °C)

Machining & Welding Inconel 625 Round Bar

Machining

Alloy 625 work-hardens rapidly under cutting loads. Use sharp carbide or ceramic tooling — high-speed steel is not recommended. Apply slow feed rates, maintain continuous chip contact, and use high-pressure flood coolant. Interrupted cuts should be avoided as they accelerate work hardening at the cut surface.

Weldability

Inconel 625 is readily weldable by GTAW (TIG), GMAW (MIG/MAG), PLASMA, SAW, and SMAW processes. No pre-heat required. Post-weld solution anneal at 980 °C restores full corrosion resistance in critical service applications.

Process	Filler / Electrode	Notes
GTAW (TIG) / GMAW (MIG)	ERNiCrMo-3 (AMS 5837)	Preferred for critical and subsea applications
SMAW (MMA)	ENiCrMo-3	Site welding and repair
SAW	ERNiCrMo-3 wire	High-deposition cladding and overlay
PLASMA	ERNiCrMo-3	Precision welding applications

Weld Overlay / Cladding

Alloy 625 weld overlay is widely specified to protect carbon steel components (boiler tubes, wellheads, valve bodies) from corrosion at low dilution rates. Alloy 625 overlay is specified in waste-to-energy plants, refuse-derived fuel boilers, and subsea wellhead applications. Inconel 625 bar is also used as feedstock for overlay cladding processes on carbon steel substrates.

Inconel 625 Round Bar Diameter & Weight Reference

Dia. (mm)	Approx. Wt. (kg/m)	Typical Form	Common Applications
3 – 15	0.06 – 1.48	Cold Drawn / Bright	Fasteners, pins
16 – 50	1.68 – 16.74	Cold Drawn / HR	Valve stems, shafts
51 – 100	17.05 – 66.8	Hot Rolled / Peeled	Pump shafts, pump impellers
101 – 200	67.5 – 268.0	Hot Rolled / Forged	Large valve bodies, flanges
201 – 400	268.0 – 1,072	Forged / Turned	Subsea connectors
401 – 600	1,072 – 2,404	Forged / Turned	Drill collars, large components

Weight formula: W (kg/m) = (π/4) × d² × 8.44 × 0.001 where d = diameter in mm. Density = 8.44 g/cm³.

Weight Chart — Metric Sizes (kg/m)

Size	1″	20 mm	24 mm	27 mm	25 mm	1-1/8″	26 mm	1-1/4″
kg/m	3.097	2.047	3.054	4.049	3.087	5.003	4.017	6.035

Size	30 mm	1-3/8″	32 mm	36 mm	35 mm	38 mm	7/8″	22 mm
kg/m	5.055	7.055	6.031	7.100	7.055	8.090	3.004	2.098

Weight Chart — Imperial Sizes (kg/ft)

Size	1/8″	3/16″	7/32″	5/16″	3/8″	7/16″	1/2″	5/8″	3/4″	1″
kg/ft	0.019	0.043	0.058	0.118	0.170	0.232	—	—	—	—

AMS 5540 Cold Drawn Bar Size & Weight Chart

Size (in.)	9/16″	5/16″	7/16″	1″	15/16″	13/16″	1-1/16″	1-1/4″	1-5/16″	1-1/8″	3/16″
Wt/ft (lb)	0.93	0.29	0.56	2.90	2.625	1.95	3.30	4.625	5.10	3.70	0.104

Size (in.)	1-1/2″	1-3/8″	1-3/4″	1-7/8″	2-1/4″	1-5/8″	2″	2-3/8″	2-1/2″	3″
Wt/ft (lb)	6.625	5.625	9.03	10.40	14.92	7.80	11.80	16.92	18.42	26.53

Bar Stock Thickness Reference

mm	Inch	mm	Inch	mm	Inch
4.8	3/16″	19.0	3/4″	50.8	2″
6.3	1/4″	25.4	1″	63.5	2-1/2″
9.5	3/8″	31.8	1-1/4″	76.2	3″
12.7	1/2″	38.1	1-1/2″	—	—
15.9	5/8″	44.5	1-3/4″	—	—

ASTM B446 UNS N06625 Rod Dimensional Tolerances (DIN EN ISO 286)

Inconel 625 Round Bar Tolerances

OD (mm)	H5	H6	H7	H8	H9	H10	H11	H12
Over 3 – 6	+0.005/0	+0.008/0	+0.012/0	+0.018/0	+0.030/0	+0.048/0	+0.075/0	+0.120/0
Over 6 – 10	+0.006/0	+0.009/0	+0.015/0	+0.022/0	+0.036/0	+0.058/0	+0.090/0	+0.150/0
Over 10 – 18	+0.008/0	+0.011/0	+0.018/0	+0.027/0	+0.043/0	+0.070/0	+0.110/0	+0.180/0
Over 18 – 30	+0.009/0	+0.013/0	+0.021/0	+0.033/0	+0.052/0	+0.084/0	+0.130/0	+0.210/0
Over 30 – 50	+0.011/0	+0.016/0	+0.025/0	+0.039/0	+0.062/0	+0.100/0	+0.160/0	+0.250/0
Over 50 – 80	+0.013/0	+0.019/0	+0.030/0	+0.046/0	+0.074/0	+0.120/0	+0.190/0	+0.300/0
Over 80 – 120	+0.015/0	+0.022/0	+0.035/0	+0.054/0	+0.087/0	+0.140/0	+0.220/0	+0.350/0
Over 120 – 180	+0.018/0	+0.025/0	+0.040/0	+0.063/0	+0.100/0	+0.160/0	+0.250/0	+0.400/0
Over 180 – 250	+0.020/0	+0.029/0	+0.046/0	+0.072/0	+0.115/0	+0.185/0	+0.290/0	+0.460/0

Inconel 625 Flat Bar Tolerances

Size OD (mm)	H5	H6	H8	H9	H10	H12
Over 3 to 6	+.005/0	+.008/0	+.018/0	+.030/0	+.048/0	+.120/0
Over 6 to 10	+.006/0	+.009/0	+.022/0	+.036/0	+.058/0	+.150/0
Over 18 to 30	+.009/0	+.013/0	+.033/0	+.052/0	+.084/0	+.210/0
Over 30 to 50	+.011/0	+.016/0	+.039/0	+.062/0	+.100/0	+.250/0
Over 80 to 120	+.015/0	+.022/0	+.054/0	+.087/0	+.140/0	+.350/0
Over 120 to 180	+.018/0	+.025/0	+.063/0	+.100/0	+.160/0	+.400/0
Over 180 to 250	+.020/0	+.029/0	+.072/0	+.115/0	+.185/0	+.460/0

Surface Finish of Inconel 625 Bar

Code	Description	Availability
HR	Hot Rolled — mill scale surface, dimensional range 16–600 mm	Ex-stock standard sizes
CD	Cold Drawn — tight tolerances, smooth surface, 3–80 mm dia.	Ex-stock standard sizes
HRAP	Hot Rolled Annealed Pickled — clean silver surface, improved corrosion resistance	Ex-stock standard sizes
BD	Bright Drawn — high surface quality, tight dimensional tolerance	Ex-stock standard sizes
P&T	Peeled & Turned — machined surface, ±0.5 mm tolerance, 50–600 mm	On request — 10 working days
CG	Centreless Ground — precision ground, h6–h9 tolerance, 3–150 mm	On request — 10 working days
Black Forged	As-forged, 200–800 mm, bespoke dimensions	On request — lead time varies

Hot Rolled (HR) and Cold Drawn (CD) finishes are ex-stock in standard sizes. Centreless Ground (CG) and Peeled & Turned (P&T) are available on request with lead times from 10 working days. Contact us with diameter and length requirements for a same-day quotation.

Alloy 625 Thermal & Physical Properties

Temp (°F)	Temp (°C)	Thermal Cond. (Btu/hr·ft²·in/°F)	Thermal Cond. (W/m·K)	Thermal Exp. (°F¹ ×10⁻&sup6;)	Thermal Exp. (°C¹ ×10⁻&sup6;)
−200	−129	4.3	7.4	—	—
0	−18	5.3	9.2	—	—
100	38	5.8	10.0	—	—
200	93	6.3	10.7	7.1	12.8
600	316	8.2	14.2	7.4	13.3
1,000	538	10.1	17.5	7.8	14.0
1,400	760	12.0	20.8	8.5	15.3
1,600	871	13.2	22.8	8.8	15.8

Inconel 625 Round Bar HS Code

HS Code: 75051220

Applications of Inconel 625 Round Bar

Alloy 625's defining characteristic is near-immunity to chloride stress-corrosion cracking, making it the first choice for marine, subsea, and sour gas environments — differentiated from Inconel 718 (aerospace rotating parts) and 600 (high-temperature furnace use).

Marine & Subsea Engineering
Sour Gas Service (NACE MR0175)
Acid & Corrosive Environments
Aerospace
Reactor Components
LNG & Cryogenic Service
Defence & Submarine
Ultra-Pure Processing

Test Certificates & Documentation

EN 10204 3.1 — Standard

EN 10204 3.2 — Bureau Veritas

EN 10204 3.2 — SGS

EN 10204 3.2 — Intertek

EN 10204 3.2 — TÜV

NACE MR0175 / ISO 15156

100 % Radiography Report

Heat Treatment Charts

Third Party Inspection

NDT Test Certificates

Raw Materials Certificate

Packaging

VCI poly-wrapped, steel-strapped bundles for small diameter bars
Seaworthy wooden crates for large bars and forged sections
ISPM 15 fumigation certification for all timber packaging
EN 10204 3.1 / 3.2 MTC included with every shipment

Why Specify Inconel 625 Round Bar?

Exceptional strength without precipitation hardening — reducing processing cost and lead time.
Superior thermal-fatigue and cyclic-loading performance vs. stainless steels.
No post-weld cracking tendency. ERNiCrMo-3 filler maintains corrosion resistance in as-welded condition.
Outperforms 316L stainless in chloride, seawater, and crevice corrosion environments.
Compliant with NACE MR0175 / ISO 15156 for H₂S-containing sour gas service.
Maintains mechanical properties from −196°C to 982°C — one alloy for extreme-range applications.

Inconel 625 Round Bar Price List

Grade	Diameter Range	Est. Price (INR/kg)
Inconel 625 (UNS N06625)	3 – 30 mm	£3,800 – £4,200
Inconel 625 (UNS N06625)	30 – 100 mm	£3,900 – £4,400
Inconel 625 (UNS N06625)	100 – 250 mm	£4,200 – £4,800
Inconel 625 (UNS N06625)	> 250 mm (forged)	On request

Prices are indicative and subject to change based on LME nickel prices and alloy surcharges. Contact Solitaire Overseas for a current quotation based on your exact diameter, quantity, condition, and certificate requirement.

Ready to Order Inconel 625 Round Bar?

Solitaire Overseas is a PED-approved, ISO 9001:2015 certified manufacturer and exporter of Inconel 625 round bars from Mumbai, India. Stock sizes dispatched within 2–4 working days domestically. International shipments to 50+ countries. Contact us today for pricing, availability, and MTC documentation.

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Frequently Asked Questions — Inconel 625 Round Bar

What standard applies to Inconel 625 round bar?

Inconel 625 round bar is produced to ASTM B446 / ASME SB446 (UNS N06625). The equivalent DIN designation is 2.4856 (Werkstoff Nr.) and the EN designation is NiCr22Mo9Nb. For aerospace bar and rod applications, AMS 5540 is the governing specification. AMS 5666 covers wire only. AMS 5837 / ERNiCrMo-3 is the welding wire specification.

What is AMS 5666 and how does it differ from AMS 5664?

AMS 5664 is the aerospace material specification for Inconel 625 bar, rod, and wire — this is the correct specification for round bar in aerospace applications. AMS 5666 is the specification for Inconel 625 wire (non-welding wire) and is not applicable to round bar or rod stock. AMS 5837 covers ERNiCrMo-3 welding wire. Both cover UNS N06625 chemistry, but AMS 5664 includes additional testing requirements such as grain size and inclusion ratings relevant to machined bar applications.

What is the difference between Inconel 625 and Inconel 718 round bar?

Inconel 625 (N06625) is solid-solution strengthened and excels in aqueous corrosion resistance and weldability — the preferred choice for marine, subsea, and chemical processing. Inconel 718 (N07718) is precipitation-hardened with higher tensile strength (965 MPa min.) at temperatures to 704 °C and is the primary choice for aerospace rotating components and high-pressure fasteners. 625 does not require an ageing heat treatment; 718 must be age-hardened to achieve its full properties.

What is the maximum diameter available for Inconel 625 round bar?

Solitaire Overseas supplies Inconel 625 round bar in diameters from 3 mm to 600 mm. Diameters above 250 mm are typically supplied as forged and turned bars with bespoke lead times. Contact us to discuss your specific requirements.

Can Inconel 625 round bar be used in cryogenic applications?

Yes. Alloy 625 retains ductility and toughness at temperatures down to −196 °C, making it suitable for LNG equipment, cryogenic valves, and low-temperature pressure vessel components. This is one of the key advantages of 625 over ferritic and martensitic alloys, which lose toughness at low temperatures.

Can Inconel 625 round bar be used in seawater service?

Yes. Inconel 625 is one of the premier alloys for seawater service due to its outstanding resistance to pitting and crevice corrosion. It is widely used in offshore oil and gas components, seawater heat exchangers, marine propeller shafts, and subsea connector systems.

What material certificates are supplied with Inconel 625 round bar?

Standard supply is with EN 10204 3.1 mill test certificates. EN 10204 3.2 (third-party witnessed by Bureau Veritas, SGS, Intertek, or TÜV) is available on request. NACE MR0175 / ISO 15156 compliance documentation is available for sour service applications.

What welding consumables are used for Inconel 625?

For GTAW/GMAW: ERNiCrMo-3 (AMS 5837 / Inconel 625 filler wire). For SMAW: ENiCrMo-3 electrode. The high Mo and Nb content of the filler prevents weld-metal cracking and maintains corrosion resistance in the as-welded condition. No pre-heat is required. Post-weld solution anneal at 980 °C is recommended for critical corrosion service.

What is the minimum order quantity for Inconel 625 round bar?

Ex-stock supply is available for standard diameters in annealed and cold-drawn conditions. Single-piece supply is available for prototypes and R&D. For non-standard diameters or custom conditions, minimum order quantities apply — contact us for a same-day quotation.

Does Inconel 625 require heat treatment to achieve its properties?

No. Unlike Inconel 718, Alloy 625 achieves its strength through solid-solution hardening. The annealed condition provides high tensile and yield strength without any ageing heat treatment. This simplifies procurement, removes post-processing steps, and reduces cost.