Just-In-Time Manufactured Alloy 625 Nickel Pipe

Manufactured Alloy 625 Nickel Pipe

UNS N06625 / W.Nr. 2.4856

COMMON TRADE NAMES: Inconel® 625, Sanicro® 625

CRA manufactures just-in-time Alloy 625 Nickel Pipe to fit your unique project specifications. CRA’s mill specializes in providing manufacturing solutions in non-standard situations requiring expedited delivery times, custom sizes, specifications, lengths, and production runs. Whether for chemical processing, DoD, or oil and gas, our unique approach to manufacturing alloy 625 schedule pipe to your exact specification is designed to serve all industries facing critical applications.

Our manufactured sizing capabilities for seamless Alloy 625 pipe and tube ranges from 2-1/16” to 10-3/4” OD with wall thicknesses up to 1.925”. Please reach out for more information on our minimum cost requirements per size.

Alloy 625 Characteristics

Alloy 625 is a nickel-chromium-molybdenum solid solution strengthened alloy with a nominal chemical composition of 61% nickel, 22% chromium, and 9% molybdenum. It is commonly referred to by the tradename Inconel® 625 and the universal designation UNS N06625. Alloy 625 provides superior corrosion resistance in aggressive environments coupled with excellent strength and weldability.

Corrosion Resistance

Alloy 625 has excellent corrosion resistance in a wide range of environments, including reducing and oxidizing acids, organic acids, salts, alkalis, and seawater. The high molybdenum content protects against pitting and other forms of localized corrosion.

Elevated Temperature Resistance

The high chromium content in Alloy 625 provides excellent oxidation and scaling resistance at temperatures up to 1800°F (982°C). Additionally, alloy 625 exhibits superior resistance to recurrent heating/cooling cycles.

Mechanical Properties

Alloy 625 is a solid solution alloy strengthened by additions of molybdenum and niobium. It can be provided in the annealed (Grade 1) condition, solution annealed (Grade 2) condition, or strengthened through the pilger process. Alloy 625 has excellent impact toughness at temperatures down to -320°F.

Heat Treatment

Alloy 625 isn’t typically strengthened by heat treatment. Solution annealing at 2000°F - 2200°F (1093°C - 1204°C) is commonly performed for applications above 1100°F to obtain optimal creep resistance. Annealing at 1600°F - 1900°F (871°C - 1037°C) is recommended for applications below 1100°F or to prevent sensitization during welding. To reduce residual stresses from fabrication, stress relieving is performed at 1100°F - 1500°F (600°C - 815°C). The rate of cooling after any of these processes does not affect mechanical properties.

Workability

Alloy 625 has good hot and cold workability in the annealed condition. Hot-working should be done above 1600°F (871°C) to ensure adequate ductility, while cold work is performed below 1200°F (649°C).

Applications

Alloy 625 is a versatile alloy used in many different applications, including the chemical process industry, aerospace, food processing, electronics, and nuclear power generation. Alloy 625 is used extensively to clad wetted surfaces of oil and gas equipment to protect against corrosion by H₂S, CO₂ , chlorides, and other aggressive media. Its elevated temperature oxidation resistance makes it a good choice for heat-treating fixtures, furnaces, incinerators, and other high-temperature equipment. CRA offers specialty alloy 625 seamless pipe & tube for use in multiple industries and applications, including:

Chemical Processing
Oil & Gas
Electronics
Nuclear Power Generation
Food Processing
Aerospace
High-temperature Environments
Heat-treating Fixtures
Furnaces
Incinerators
Condenser Tubes

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Chemical Composition

C	Cr	Ni	Fe	Mn	Si	Mo	Co	P	S	Ti	Nb + Ta	Al
≤ 0.1	20 - 23	≥ 58	≤ 5	≤ 0.5	≤ 0.5	8 - 10	≤ 1*	≤ 0.015	≤ 0.015	≤ 0.4	3.15 - 4.15	≤ 0.4

(mass %)
*If determined

Specifications

ASTM B444, ASME SB444, AMS 5581

Specified Mechanical Properties in Annealed (Gr. 1) or Solution Annealed (Gr. 2) Conditions

Per ASTM B444, ASME SB444, AMS 5581

Condition	Tensile Strength	Yield Strength	Elongation
Condition	minimum, ksi	minimum, ksi	minimum, %
Grade 1	120	60	30
Grade 2	100	40	30

*Higher strength properties can be provided in the cold hardened condition.

Typical Physical & Mechanical Properties in Annealed Condition

		70°F	200°F	400°F	600°F	800°F	1000°F
Density	lbs/in³	0.305	-	-	-	-	-
Thermal Expansion	X10^-6/°F	-	7.1	7.3	7.4	7.6	7.7
Elastic Modulus	10³ ksi	30.1	29.6	28.7	27.8	26.9	25.7
Poisson Ratio	-	0.278	0.28	0.286	0.29	0.295	-
Thermal Conductivity	Btu-in/h·ft²·°F	68	75	87	98	109	139
Specific Heat	Btu/lb·°F	0.098	0.102	0.109	0.115	0.122	0.118
Yield Strength	ksi	70	68	63	60	59	34
Tensile Strength	ksi	140	134	130	129	129	88

Manufacturing Process

PROCESS	DESCRIPTION
Steel Making	Electric Arc Furnace followed by Vacuum Oxygen Decarburization (VOD) or Argon Oxygen Decarburization (AOD).
Pipe Making	Conventional Seamless Cold Finished Pipe and Tube Manufacturing Processes.
Heat Treatment	Cannot be hardened by heat treatment. May be provided in the annealed, solution annealed or cold hardened condition. The higher strength annealed condition is typically employed in services up to 1100°F, while the solution annealed condition is used in applications above 1100°F.

Schedule Pipe

Manufacturing Capabilities

CRA manufactures this alloy in:
Seamless Pipe

MIN OD: 2-1/16″ (2.0625″)
MAX OD: 10-3/4″ (10.750”)
THICKNESS: Up to 1.925”
LENGTHS: Up to 70′

Standard & Non-Standard Sizes Available.

Manufactured Material Available as Quickly as 1 Week.

Non-Standard Mill Quantities Accommodated

Alloy 625 Nickel Pipe Manufacturing