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Inconel 718 Pipe
Inconel 718 Tube (UNS N07718/ W. Nr. 2.4668) is a Nickel-Chromium alloy being precipitation hardenable and having high creep-rupture strength at high temperatures to about 700°C (1290°F). Alloy 718 Tube has good mechanical strength in comparison to Inconel X-750 Tubes and higher mechanical properties at lower temperatures than Nimonic 90 Tubes and Inconel X-750 Tubing.
Descriptions

Alloy 718 Tube Size: 15 NB to 150 NB or 1/2" OD - 12" OD

Standards: ASTM B163, B516 / ASME SB163, B516, AMS 5589/ 5590

Type: Seamless / ERW / Welded / Fabricated / Hollow / LSAW Pipes

Wall thickness: 0.40 mm - 12.70 mm (special wall thicknesses available)

Schedule: SCH5, SCH10, SCH40, STD, SCH80, SCH160

Finish: Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF

Form: Round, Square, Rectangular, Hydraulic, Straight or U bent Tubes Etc.

Length: Single Random, Double Random & Cut Length.

End: Plain End, Beveled End, Treaded.

Marking: Standard, Grade, OD, Thickness, Length, Heat No. (Or according to the customer’s request.)

We can also cut, thread, and groove Inconel 718 tubes to meet your specifications.

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Product Pictures
  • Inconel 718 Pipe
  • Inconel 718 Pipe
  • Inconel 718 Pipe
  • Inconel 718 Pipe
Dimensions and Tolerance

Equivalents Grades & Standards of Inconel 718 Pipe & Tubes :

STANDARD

WERKSTOFF NR.

UNS

JIS

AFNOR

BS

GOST

EN

OR

Inconel 718

2.4668

N07718

-

-

-

-

-

-

 

Chemical Composition of Inconel 718 Pipes & Tubes :

Inconel

%

Ni

Cr

Fe

Mo

Nb

Co

C

Mn

Si

S

Cu

Al

Ti

718

Min.

50

17

balance

2.8

4.75

 

 

 

 

 

 

0.2

0.7

Max.

55

21

3.3

5.5

1

0.08

0.35

0.35

0.01

0.3

0.8

1.15

 

Mechanical & Physical Properties of Inconel 718 Pipes & Tubes :

Density

8.2  g/cm3

Melting Point

1350 °C (2460 °F)

Tensile Strength

Psi – 1,35,000 , MPa – 930

Yield Strength (0.2%Offset)

Psi – 75,000 , MPa – 482

Elongation

45 %

 

 

TESTING & INSPECTION OF INCONEL 718 TUBES

Testing (Destructive, Non Destructive)

Positive Material Identification – PMI Testing

Hydrostatic Test

Chemical Analysis – Spectro Analysis

Hydrogen-Induced Cracking (HIC) Test

Mechanical Testing Such as Tensile, Elongation, Reduction of Area

Sulfide Stress Corrosion Cracking (SSC), NACE TM 0177

Micro Test

Radiography Test

Macro Test

Dye Penetrant Test (DP Test)

Hardness Test

Ultra Sonic Test (UT)

Pitting Resistance Test

Eddy Current Testing

Intergranular Corrosion (IGC) Test

Impact Test

Flaring Test

Bend Test

Flattening Test

 

 

INCONEL 718 TUBE MANUFACTURING PROCESS

Welding Process

The grade and application requirements have an impact on tube welding and forming. For the manufacturing of tiny diameter tubes, we employ TIG welding. Steel sheets are coiled and welded inside of a welding machine. The steel sheets are shaped into a coil before entering the machine. The seam between these coils is then welded to create a tube.

 

Drawing/ Floating Process

Pulling a metal bar, rod, or wire through the entirety of a die to change its finish, shape, size, and/or mechanical qualities is known as floating or drawing. The tube's outer, inner, and wall thicknesses are all reduced via the tube drawing procedure. Inconel tubes benefit from maintaining the integrity of their surface.

 

Continuous Seamless Tube Mills

The production of seamless tubes has been transformed by continuous tube mills. These mills do away with the necessity for forging welding or filler metal, in contrast to conventional procedures. With the use of this technology, seamless pipes and tubes may be produced continuously, increasing productivity while lowering costs and improving efficiency.

 

Continuous Casting

A notable advancement in the production of seamless tubes is continuous casting. The metal is solidified into a continuous billet through the continuous pouring of molten metal into a water-cooled mould. Better uniformity and enhanced mechanical qualities are guaranteed by this continuous casting technique for the tubes.

 

Annealing

Metal is heated above the point of re-crystallization and cooled to room temperature during the annealing process. The molecular bonds in metal tighten when it is shaped, making it rigid. The metal is put through an annealing process to regain its ductility.

 

Sinking Process

Tube sinking is a drawing technique that reduces the diameter of tubes. In this drawing technique, a tube is run through a die without the need of a mandrel. Good inner surface quality is not ensured when using a mandrel. The die angel determines the integrity of the outer surface. The die being used produces a uniform surface. A tube can be significantly smaller than it was originally. When cost is a factor, tube sinking is ideal.

 

Inspection and Testing

Before sending our items to our consumers, we conduct inspection procedures to verify their integrity.

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