Inconel 718 Seamless Tube

Inconel 718 Seamless Tube – High-Performance Alloy for Extreme Environments

TSM Technology's Inconel 718 Seamless Tube has a proven track record of performance in the most extreme environments. Our production capability is 100-200 tonnes/ month for seamless tubes with tensile strength ≥1240 MPa and yield strength ≥1035 MPa. Constructed to ASTM B983, ASME SB983 standards, these tubes avoid the weld-path weaknesses with improved burst pressure ratings up to 1300°F (700°C). Our tube dimensions vary from OD 6 to 219 mm and wall thickness from 0.5 to 15 mm. We ultrasonically and eddy current test every tube in our 50,000㎡ ISO 9001 and AS9100D certified facility.

What is Seamless Tube Inconel 718?

The product is a precipitation hardening nickel chromium alloy produced by cold drawing or cold rolling. This is a continuous structure, no welds.

The seamless design solves critical challenges you face daily:

• Material fatigue during extreme thermal cycles
• Stress-corrosion cracking in sour gas environments
• Structural deformation under high-pressure loads

Unlike welded alternatives, our seamless construction eliminates preferential weld-path corrosion. You get superior burst pressure ratings for high-integrity fluid and gas transport in mission-critical systems.

Specification

Physical and Chemical Properties

Chemical Composition (wt%)

Mechanical Properties

Product Standards

Our tubes comply with international specifications:

• ASTM B983 – Standard Specification for Seamless Tubes
• ASTM B637 – Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock
• ASME SB983 – Boiler and Pressure Vessel Code
• AMS 5589 / AMS 5590 – Aerospace Material Specifications
• API 6A CRA – Wellhead and Christmas Tree Equipment
• NACE MR0175 / ISO 15156 – Sour Gas Service
• JIS, DIN, EN – Regional industrial standards

Application

Inconel 718 Seamless Tube serves three primary industrial sectors:

Aerospace & Defense

• High-pressure fuel lines in jet engines
• Hydraulic systems exposed to thermal gradients
• Afterburner components requiring fatigue resistance

Oil & Gas (Upstream)

• Downhole completion tools for HPHT wells
• Chemical injection lines in sour gas fields
• Wellhead equipment per API 6A specifications

Nuclear Power Generation

• Steam generator tubing
• Core component sleeves resistant to neutron radiation
• Systems requiring IGSCC prevention

Factory

TSM Technology operates a state-of-the-art manufacturing complex equipped with:

Advanced cold-drawing lines for precision tube production

Multi-stage heat treatment furnaces with controlled atmosphere

Comprehensive testing laboratory with UT, ET, and hydrostatic capabilities

Automated quality inspection systems

Clean room facilities for aerospace-grade finishing

Our Inconel 718 Seamless Tube facility holds ISO 9001, AS9100D, and AS9120 certifications, demonstrating our commitment to aerospace and high-tech applications.

Production and Processing Technology

What is the Production Process of Inconel 718 Seamless Tubes?

Step 1: Raw Material Selection

We purchase high purity nickel chromium alloy ingots from reputable sources.

Step 2: Hot Extrusion

Billet material is heated and extruded into hollow tube shells.

Step 3: Cold Drawning

Multiple passes using precise dies decrease diameter, refine wall thickness to close tolerances

Step 4: Heat Treatment

• Solution annealing at 1900–1950°F
• Age hardening at 1325°F for 8 hours

Step 5: Finishing

Bright annealing, pickling or polishing as per your requirements.

Step 6 : Testing & Inspection

Each tube is checked for quality.

Quality Inspection

Your projects need zero-defect materials. Quality control consist of:

Ultrasonic Testing (UT): Detects internal inclusions and longitudinal defects

Eddy Current Testing (ET): Identifies surface and near-surface flaws

Hydrostatic Testing: Verifies pressure containment integrity

Positive Material Identification (PMI): Verifies conformance to chemical makeup

Dimensional Inspection: wall thickness uniformity, ovality control as per ASTM E112

Microstructural Analysis Confirms grain size for best fatigue life

All tubes are supplied with full traceability documents: MTC, QAC, ITP and MTR certifications.

Size inspection

Hydrostatic test

Eddy current testing (ET)

Alloy 718 OES

Why Choose TSM Technology?

Over 14 Years of Global Excellence

We've exported to 70+ countries, building trust through consistent quality.

AS9100D Certified Manufacturing

Our aerospace-grade facility meets the strictest industry standards.

Advanced Production Capacity

50,000㎡ modern factory with 100+ precision machines ensures tight tolerances and superior surface finishes.

Comprehensive Testing Laboratory

In-house capabilities for all critical NDT and mechanical testing.

Customer-First Service

Fast response times, technical consultation, and reliable after-sales support throughout your project lifecycle.

Flexible Customization

Whether you need standard sizes or specialized dimensions, we adapt to your requirements.

Package and Shipping

We protect your investment with professional packaging:

• Individual plastic caps on tube ends
• Bundling with steel straps
• Wooden cases for international shipping
• Custom packaging available for sensitive applications

Delivery Time: 20-45 Days (According to order quantity and custom needs)

FAQ

Q: What is the major benefit of the product over welded tubes?

A: Seamless tubes are more uniform structurally. They are designed to remove the heat affected zone (HAZ) of a weld, a location of typically premature corrosion or mechanical failure.

Q: Are these tubes suitable for cryogenic applications?

A: Yes. The material has good impact strength and ductility at sub-zero temperatures. This makes it appropriate for liquid oxygen and hydrogen carrier systems.

Q: What is the normal heat treatment for these tubes?

A: Tubes are normally delivered in solution-annealed form. Then they are age hardened by precipitation hardening at 1325 °F so as to attain maximal strength by the development of gamma prime phase.

Q. What is the performance in sour gas (H2S) service?

A: It has excellent resistance. The alloy is qualified for NACE MR0175/ISO 15156 service in extremely corrosive oilfield settings including H2S and CO2.

Q: What are common machining challenges?

A: High work-hardening rates need carbide tools, lower cutting speeds and enough coolant for machining. We may also provide size-specific tubes to facilitate your production process.

Q: Do you provide material certifications?

A: Yes. All shipments are accompanied by material test certificates (MTC), SGS reports and complete traceability paperwork according to your quality standards.

Q : What is your minimum order quantity?

A: Our MOQ is just 50kg and we have common size stock to assist your urgent projects.

Contact Us

Ready to solve your Inconel 718 Seamless Tube extreme-environment challenges? Contact our technical team at info@tsmnialloy.com for specifications, pricing, and expert consultation today.