Inconel 625 (UNS N06625) Precision Tube

PRODUCTS

NEWS

PRODUCTS LOCATION：HOME > PRODUCTS > Inconel 625| ASTM B444 UNS N06625| Nickel Alloy 625 tube

Inconel 625| ASTM B444 UNS N06625| Nickel Alloy 625 tube

ASTM B444-certified Inconel 625 precision tubing for extreme environments (-423°F to 1800°F). Corrosion-resistant Inconel 625 pipes for marine/chemical applications. Solve chloride stress corrosion with Inconel 625 precision tubes.

Description

Inconel 625 is a nickel-chromium-iron alloy with a safe operating temperature range of -238°F (-150°C) to 1800°F (982°C), making it suitable for a wide range of applications requiring high corrosion resistance. As a nickel-based, malleable high-temperature alloy, it offers exceptional resistance to oxidation, stress corrosion cracking, and chloride ion attack. These properties make it an ideal material for marine environments and other demanding industrial applications.

⭐Our Inconel 625 Precision Seamless Tubing

Standard: ASTM B444/ASME SB444
Material Grade: Inconel 625 (UNS N06625)
Type: Seamless Nickel Alloy Tube
Available O.D.: 6.35mm-76.2mm
Available W.T.: 0.7mm-3mm
Length: 6000mm or customized as per requirements

Metallographic Structure of Inconel 625 Alloy

Inconel 625, a nickel-based alloy, possesses a face-centered cubic (FCC) structure. Prolonged exposure to 650°C induces the precipitation of carbon particles and metastable quaternary phases, which eventually transform into a stable orthorhombic Ni₃(Nb,Ti) phase.

Following solid-solution strengthening, the alloys metallographic structure primarily consists of nickel, chromium, and molybdenum solid solutions, with trace amounts of iron, aluminum, and titanium. This microstructure typically exhibits fine grains and a homogeneous solute distribution, enhancing the materials mechanical properties.

While the alloys high chromium and molybdenum content significantly improves its corrosion and oxidation resistance—particularly in high-temperature environments—these additions may reduce material ductility

Perfomances of Inconel 625 UNS N06625 Tube

1. Inconel 625 alloy is distinguished by its exceptional corrosion resistance in a variety of ways:

Resistant to inorganic acid corrosion (nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid) and inorganic acid mixed solutions.
Resistant to corrosive media in oxidizing and reducing situations
Resistant to pitting and crevice corrosion, without stress corrosion cracking induced by chlorides.
Resistant to corrosion by hydrochloric acid solutions at different concentrations (40°C)

2. High strength

3. Excellent processability and weldability, with no sensitivity to post-weld cracking

4. Good plasticity and ductility

Chemical Composition of Inconel 625 Nickel Alloy Tube

Grade	C	Mn	P	S	Si	Cr
B444 N06625	≤0.10	≤0.50	≤0.015	≤0.015	≤0.50	20.00-23.00
Nb+Ta	Co	Mo	Fe	Al	Ti	Ni
3.15-4.15	≤1.00	8.00-10.00	≤5.00	≤0.40	≤0.40	≥58.00

Mechanical Properties of Inconel 625 Nickel Alloy Tube

Tensile Strength: ≥100 ksi [690 MPa]

Yield Strength: ≥40 ksi [276 MPa]

Elongation: ≥30%

Physical Properties of Inconel 625 Nickel Alloy Tube

Density: 8.44 g/cm3

Melting Range: 1290-1350℃ [2350-2460]

Poissons Ratio: 0.29

Elastic Modulus: 200 GPa

Specific Heat Capacity: 440 J/kg·K

Thermal Conductivity: 11 W/m·K

Heat Treatment of ASTM B444 UNS N06625 Seamless Tube

Inconel 625 nickel alloy tubes often have two heat treatment states:

Annealed: 625 alloy tubes are typically utilized in temperatures below 593℃ (1100℉).
Solution annealed: 625 alloy tubes can be employed in conditions over 593℃ (1100℉) for material creep resistance.

UNS N06625 Equivalent Grades

Inconel 625

UNS N06625

GB NS336

2.4856

DIN NiCr22Mo9Nb

BS NA21

AFNOR NC 22 DNb

Available Tests of Nickel Alloy Tube

1. Flare Test

Evaluates the pipes radial deformation performance by expanding it to a specified diameter, revealing potential material flaws. During the test, a 60° tapered mandrel is driven into one end of the sample to achieve a uniform 30% expansion. The expanded section is then inspected for cracks or defects to determine compliance.

Flare Test

2. Hydrostatic Test

Each nickel alloy pipe undergoes pressurized testing under controlled conditions—including test pressure, pressurization rate, and fluid medium—to verify the structural integrity of both the base metal and welds. The test ensures leak-tightness and mechanical strength under sustained pressure.