Inconel 625 Seamless tube

Inconel 625 Seamless Tube – High-Performance Nickel Alloy Tubing Solutions

TSM Technology specializes in manufacturing Inconel 625 Seamless Tube with exceptional structural integrity and corrosion resistance.  Our Inconel 625 seamless tubes are manufactured using the cold-drawing or cold-rolling process, ensuring a superior grain structure and dimensional accuracy. Conforming to international standards, each tube undergoes rigorous NDT (eddy current, ultrasonic) and hydrostatic testing. Inconel 625 seamless pipes are manufactured without weld seams, offering superior mechanical strength and enhanced pressure resistance compared to welded pipes. 

We have a sophisticated production site (50,000㎡) with more than 100 precise equipment and a capacity of 100-200 tons per month for manufacture of tubes to ASTM B444 and ASME SB444 specifications. Our products have a tensile strength of more than 827 MPa and a yield strength of more than 414 MPa, which guarantees consistent operation in high temperatures from cryogenic to 982°C. Each tube is subjected to rigorous testing including hydrostatic testing at 10,000+ PSI and ultrasonic examination.

What are the Inconel 625 Seamless Tubes?

Inconel 625 seamless tube is a high-performance nickel-chromium-molybdenum alloy tube manufactured according to ASTM B444 standard. It offers outstanding corrosion resistance, high temperature strength, and excellent mechanical properties, making it ideal for aerospace, marine, oil & gas, and chemical processing applications. Our seamless tubes are manufactured from nickel-chromium-molybdenum alloy UNS N06625, stabilized with niobium to boost strength properties. 

Inconel Alloy 625 Commonly called: Inconel 625, Alloy 625, Nickel 625, Chronin 625, Altemp 625, Nickelvac 625, Haynes 625, Nicrofer6020, INCONEL nickel-chromium alloy 625 (UNS N06625/W.Nr. 2.4856). Its typical chemical composition consists of approximately 58% nickel, 20–23% chromium, and 8–10% molybdenum. This well-balanced combination provides exceptional resistance to oxidation, carburization, crevice corrosion, and chloride-induced stress corrosion cracking. As a result, it is highly suitable for use in harsh and corrosive industrial conditions. The alloy performs reliably across a wide temperature range, from extremely low temperatures up to about 1800°F (982°C). Its strength primarily comes from solid-solution strengthening, where molybdenum and niobium enhance the rigidity of the nickel-chromium matrix, eliminating the need for precipitation hardening treatments. This composition also ensures excellent resistance to severe chemical environments and high-temperature degradation.

What are the Features of Inconel 625 Seamless Tube?

Outstanding Corrosion Resistance

The high nickel content (58% min) combined with chromium provides immunity to stress corrosion cracking. Your tubes remain intact even in high-chloride seawater environments.

Exceptional Strength

Molybdenum and niobium additions create superior fatigue strength. The tubes maintain mechanical properties under cyclic thermal loading.

Seamless Integrity

No welded seams mean no thermal vulnerabilities. You get uniform strength throughout the entire tube structure.

Wide Temperature Range

Reliable operation from cryogenic temperatures up to 982° C. It has exceptional toughness and impact strength over this whole range.

Superior Fabricability

Excellent weldability allows easy integration with other alloys. Often used as filler metal for dissimilar metal joining.

Specifications of Inconel 625 Seamless Pipe

Physical and Chemical Properties

Standards for Inconel 625 Seamless Pipe & Tube

Our Inconel 625 Seamless Tube complies with internationally recognized standards:

· ASTM B444 — Specification for Nickel-Chromium-Molybdenum-Columbium Alloy Pipe and Tube

· ASTM B446 — Rod and Bar, Nickel-Chromium-Molybdenum-Columbium Alloy

· ASME SB444 – Pressure vessel and boiler code DIN 17754 – European standard for seamless tubes

· JIS G3463 — Japanese industrial standard

· NACE MR0175 certification for compatibility with sour service

All materials come with full traceability documentation including MTC, SGS, BV, and TUV test reports.

*We will strictly produce Inconel 625 Seamless Pipe & Tube according to the standard

Production and Processing Technology

TSM Technology innovation utilizes advanced manufacturing methods to create high-quality consistent channels. Our 50,000㎡ manufacturing facility is equipped with more than 100 precision machines. devoted to combination processing. We use vacuum induction melting (VIM) followed by vacuum arc remelting (VAR) to achieve a homogeneous chemical composition. The consistent pipe generation includes hot-penetrating and pilgering processes, guaranteeing uniform wall thickness and a high surface finish.

Process Capabilities

Hot extrusion & cold drawing seamless process
Precise OD tolerance up to ±0.05mm
Lengths up to 15 meters (custom spools available)
Pickling, bright annealing, or polished surface finishes
100% PMI (Positive Material Identification) verified

What is the Production Process of Inconel 625 Seamless Tube?

Our manufacturing process ensures superior quality:

Step 1: Raw Material Selection

We source high-purity Inconel 625 from qualified suppliers. Positive Material Identification (PMI) verifies the exact Ni-Cr-Mo-Nb ratio.

Step 2: Billet Preparation

Alloy billets are heated to precise forging temperatures in controlled atmosphere furnaces.

Step 3: Hot Extrusion or Rotary Piercing

The heated billet passes through mandrels to create seamless tubes. This eliminates weld seams entirely.

Step 4: Cold Drawing

Multiple passes through precision dies achieve exact dimensions. Tight tolerances ensure dimensional accuracy within ±0.05mm.

Step 5: Heat Treatment

· Grade 1: Annealed at lower temperatures for higher tensile strength

· Grade 2: Solution annealed at higher temperatures for optimized creep-rupture strength above 650°C

Step 6: Surface Finishing

The stated surface finish is obtained via bright annealing, pickling or polishing This makes it more resistant to corrosion and better looking.

Step 7: Straightening and Cutting

Precision machinery cuts tubes to your exact lengths, retaining straightness tolerances.

Quality Inspection

The quality assurance is aimed at both the dimensional accuracy and the metallurgical soundness:

Material Verification

Positive Material Identification (PMI) confirms the exact alloy composition matches UNS N06625 specifications.

Pressure Testing

Hydrostatic Testing at pressures exceeding 10,000 PSI ensures complete wall integrity. No leaks, no compromises.

Flaw Detection

· Ultrasonic Testing (UT) detects internal laminations

· Eddy Current Testing identifies subsurface flaws invisible to the eye

Corrosion Resistance

Intergranular Corrosion Testing (ASTM G28) confirms resistance to oxidizing environments. Essential for chemical processing applications.

Metallurgical Analysis

· Hardness Testing verifies proper heat treatment

· Grain Size Analysis (ASTM E112) ensures NACE MR0175 compliance for sour service

· Tensile and Impact Testing validates mechanical properties

All tubes include complete documentation: Quality Assurance Certificate (QAC), Inspection Test Plan (ITP), and Material Test Report (MTR).

100% Eddy Current Testing (ET)

Hydrostatic test

Surface Inspection

Alloy 625 OES

SGS test report

Why Choose TSM Technology?

Proven Expertise

Over Inconel 625 Seamless Tube 14 years of experience manufacturing high-performance alloys. We've exported to 70+ countries across aerospace, marine, and petrochemical industries.

Advanced Manufacturing

Our 50,000㎡ facility has over 100 precision machinery. From melting to final inspection, full-process capability guarantees constant quality.

Tight Certifications

ISO 9001, AS9100D & AS9120 Certified. Aerospace-grade requirements provide dependability for the most demanding applications.

Comprehensive Testing

In-house laboratory equipped with ultrasonic, radiographic, and eddy current testing equipment. Every tube undergoes multiple quality checks.

Custom Solutions

Engineering team provides technical consultation for your specific requirements. Customized sizes and processing available.

Global Logistics

Established Hong Kong trading hub ensures timely delivery worldwide. Professional packaging protects tubes during international shipping.

Complete Traceability

Full documentation accompanies every order. You get peace of mind knowing the exact material pedigree.

Application

Deepwater Offshore Exploration

Used for downhole control lines and subsea manifolds. Withstands extreme hydrostatic pressure and sour gas (H₂S/CO₂) concentrations without failure.

Aerospace Propulsion Systems

Integral to jet engine exhaust liners and fuel spray bars. Resists oxidation and thermal fatigue at temperatures up to 982°C.

Chemical Processing Units

Essential in phosphoric acid production and mixed acid handling. Seamless integrity prevents hazardous leakages in high-vibration heat exchangers.

Marine Engineering

Seawater cooling systems and offshore platforms benefit from exceptional pitting resistance. The PREN value exceeds 45, providing virtually immunity to crevice corrosion.

Nuclear Power Generation

Steam generator tubing and reactor coolant systems. Maintains structural integrity under radiation exposure and high temperatures.

TSM Technology manufactures precision nickel and nickel alloy tubes in the following alloys:

Package and Shipping

Protective Packaging

· Plastic caps seal both tube ends, preventing contamination

· Hexagonal bundles wrapped in waterproof material

· Wooden cases or pallets for international shipping

· Custom packaging available for special requirements

Documentation

Each shipment includes:

· Commercial invoice and packing list

· Material Test Reports (MTR)

· Quality certificates (QAC/ITP)

· Origin certificates when required

Delivery Time

Standard orders: 20-45 days from confirmation

Rush orders: Contact us for expedited production scheduling

FAQ

Q: What is the difference between Inconel 625 seamless and welded tubes?
Seamless tubes have no longitudinal weld seam, offering superior uniform grain structure and enhanced corrosion resistance, particularly in high-pressure and high-temperature services. Our Inconel 625 seamless variant ensures maximum reliability for critical applications.

Q: Can Inconel 625 seamless tubes be used in sour gas environments?
Yes, Inconel 625 meets NACE MR0175 / ISO 15156 for sour service, demonstrating resistance to sulfide stress cracking (SSC) and chloride-induced cracking, making it a top choice for H2S-containing oil & gas environments.

Q: What delivery options and certifications do you provide?
We supply with EN 10204 3.1 certificate, heat treatment reports, and NDT records. Global shipping via air, sea, or land; stock availability for standard sizes and fast production for custom orders.

Q: How do you ensure dimensional accuracy of seamless tubes?
Our cold drawing process with precision mandrels and multi-step annealing ensures tight tolerances. Each lot undergoes laser OD/ID gauging and profile inspection to meet ASTM B444 class requirements.

Q: What are the common delivery conditions?

A: Typically supplied in Bright Annealed (BA) or Pickled and Annealed (AP) finishes to meet ASTM B444 specifications. We can also provide polished finishes for specific applications.

Q: How do you ensure dimensional accuracy?

A: Multiple cold drawing passes through precision dies achieve tolerances within ±0.05mm. Final inspection verifies all dimensions before shipment.

Contact Us

Ready to specify Inconel 625 Seamless Tube for your next project? Our technical team is standing by to answer your questions. 

Email: info@tsmnialloy.com for quotations, technical data sheets, or application guidance.