01
ASTM B444 / B444M
Nickel-chromium-molybdenum-columbium alloy pipe and tube
Standard specification for seamless nickel-chromium-molybdenum-columbium alloy pipe and tube for general corrosion-resistant and high-temperature service.
Nickel Alloy — Industrial Product
Inconel 625 Tubes & Pipes
Inconel 625 nickel alloy tubes and pipes supplied to ASTM B444 / B704 / B705 for chemical processing, marine, offshore and high-temperature service.
Indicative priceUSD 35,000 - 55,000 / MT (volume, OD/WT, standard and condition dependent)
Lead time30 - 60 working days
01
Overview
Inconel 625 Tubes & Pipes combine a nickel-chromium matrix with molybdenum and niobium additions to deliver exceptional resistance to pitting, crevice and stress-corrosion cracking across a wide range of corrosive media. The alloy retains useful strength from cryogenic temperatures up to approximately 1000 °C and is supplied in the annealed condition for general chemical, marine and offshore service. Tubes are drawn or hot finished per ASTM B444, with welded tube and pipe supplied to ASTM B704 and ASTM B705 as applicable. The combination of corrosion resistance, weldability and thermal stability makes the product suited to chemical process piping, heat exchanger and condenser tubing, offshore flow lines, seawater piping systems and exhaust ducting in marine and power-generation service. Each delivery is supported by mill test certification per EN 10204 3.1 and full traceability of heat number and chemical analysis.
Key Characteristics
- 01 Corrosion Resistance Provides improved resistance to corrosive industrial environments.
- 02 Chloride Resistance Resistance to chloride-induced pitting and crevice corrosion in marine and saline environments.
- 03 Stress Corrosion Resistance Offers improved resistance to stress corrosion cracking under suitable service conditions.
- 04 High Temperature Capability Suitable for elevated-temperature service within the applicable material limits.
- 05 Cryogenic Toughness Retains ductility and impact strength at sub-zero temperatures down to approximately -196 °C.
- 06 Oxidation Resistance Provides resistance to oxidation and scaling at elevated temperatures.
- 07 Good Weldability Supports welding using suitable procedures and compatible filler materials.
- 08 Good Formability Supports bending, forming and other fabrication processes with suitable processing conditions.
- 09 Seamless Construction Manufactured without a longitudinal welded seam in the product body.
- 10 Precision Dimensions Available with controlled dimensions for applications requiring consistent fit and assembly.
- 11 Standard Compliance Manufactured and supplied in accordance with the specified material and product standards.
- 12 Third-Party Inspection Third-party inspection can be arranged according to project and procurement requirements.
Typical Applications
- Chemical Processing Process piping, transfer systems and equipment for corrosive and high-purity media.
- Marine Engineering Piping, structural components and equipment exposed to chloride-containing marine environments.
- Oil & Gas Service Process piping, flow lines and utility systems across onshore and offshore upstream, midstream and downstream operations.
- Petrochemical Piping, process systems and equipment for refining, petrochemical production and hydrocarbon processing.
- Heat Exchangers Shell-and-tube, plate and finned heat exchangers for HVAC, process and refrigeration applications.
- Power Generation Piping, tubing and structural components for conventional and combined-cycle power stations.
- Shipbuilding Hull, structural sections and piping for commercial and naval vessels.
- Welding & Fabrication Metal structures, assemblies and fabricated components for welded construction.
02
Specifications
Numbers in this section correspond to the applicable product standard, formatted for direct use in enquiry and approval documents.
Product specification
- Material
- Nickel-chromium-molybdenum-niobium alloy
- Grade
- Inconel 625 / NiCr22Mo9Nb / 2.4856
- UNS_designation
- N06625
- Product_form
- Seamless or welded tube / pipe
- Manufacturing_method
- Cold drawn seamless; hot finished seamless; welded and redrawn
- Condition
- Solution annealed
- Surface
- Annealed & pickled; bright annealed on request
- Cross_section
- Hollow circular, uniform wall thickness
- End_condition
- Plain end; cut-to-length or machined ends on request
Supply specifications
- Outside_diameter
- 6 - 260 mm (drawn seamless); larger sizes as hot finished or welded
- Wall_thickness
- 0.5 - 25 mm typical; subject to OD and mill capability
- Inside_diameter
- Per OD and wall thickness combination
- Length
- Up to 12 m; cut-to-length on request
- Shape
- Round; U-bend tube available on request
- Tolerance
- Per ASTM B444 (drawn) / ASTM B704 (welded tube) / ASTM B705 (welded pipe) as applicable
- Surface_finish
- Annealed & pickled; bright annealed, polished or ground on request
- Marking
- Standard mill marking including grade, size, heat number and standard; customer marking on request
Final supply is confirmed against the project drawing, purchase agreement and the mill test certificate.
Chemical composition
ElementRequirement
Ni >= 58.0 %
Cr 20.0 - 23.0 %
Mo 8.0 - 10.0 %
Nb + Ta 3.15 - 4.15 %
Fe <= 5.0 %
Mn <= 0.50 %
Si <= 0.50 %
C <= 0.10 %
Al <= 0.40 %
Ti <= 0.40 %
Co <= 1.0 %
P <= 0.015 %
S <= 0.015 %
Reference: Per ASTM B444 / B704 / B705 for Inconel 625 (UNS N06625).
Mechanical properties
PropertyRequirement
Tensile strength (Rm, annealed) >= 827 MPa
Yield strength (Rp0.2, annealed) >= 414 MPa
Elongation in 50 mm (annealed) >= 30 %
Hardness_annealed <= 287 HB / ~100 HRB
Tensile strength (Rm) at 650 °C ~700 MPa (typical)
Yield strength (Rp0.2) at 650 °C ~480 MPa (typical)
Tensile strength (Rm) at 870 °C ~340 MPa (typical)
Impact toughness (annealed, -196 °C) >= 120 J (typical)
Reference: Annealed condition values per ASTM B444 at room temperature; elevated-temperature values are typical and provided for design reference only.
Physical properties
PropertyTypical Value
Density 8.44 g/cm³
Melting range 1290 - 1350 °C
Elastic modulus 207 GPa at 20 °C
Shear modulus 82 GPa at 20 °C
Poisson's ratio 0.278
Thermal conductivity 12.1 W/m·K at 20 °C
Specific heat 410 J/kg·K at 20 °C
Electrical resistivity 1.29 µΩ·m at 20 °C
Thermal expansion (20 - 100 °C) 12.8 x 10⁻⁶ /°C
Curie temperature Non-magnetic (essentially)
Reference: Typical material values for Inconel 625 nickel alloy in the annealed condition.
Reference framework
Standards & documentation
The applicable product, dimensional and inspection standards should be confirmed together in the purchase specification.
02
ASTM B704 / B704M
Welded nickel alloy tubes
Standard specification for welded nickel alloy tubes for general corrosion-resistant service at low and moderate temperatures.
03
ASTM B705 / B705M
Welded nickel alloy pipe
Standard specification for welded nickel alloy pipe for general corrosion-resistant service at low and moderate temperatures.
04
ASME SB444 / SB444M
ASME pressure vessel equivalent
ASME counterpart of ASTM B444 for pressure vessel and high-temperature applications.
05
AMS 5581 / AMS 5599
Aerospace Material Specification - Inconel 625 tube
Aerospace Material Specification reference for Inconel 625 seamless tube, including close-tolerance drawn product.
06
EN 10216-5 / EN 10217-5
European seamless and welded nickel alloy tubes
European reference for seamless and welded stainless and nickel alloy tubes for pressure purposes.
07
EN 10204
Inspection documents
Defines inspection document types such as 3.1 and 3.2 for metallic product delivery.
03
Capability
From custom dimensions and precision sizing to heat treatment, surface finishing and product-specific processing, Wayland coordinates supply solutions tailored to your requirements.
Cutting
Cut-to-length and custom cutting according to order requirements.
Custom Dimensions
Non-standard dimensions, tolerances and dimensional combinations subject to product and mill capability.
Precision Sizing
Precision sizing and dimensional control for tighter tolerance requirements.
Cold Working
Cold drawing, cold sizing and other cold-working processes where required.
Heat Treatment
Heat treatment according to material, specification and applicable standard.
Surface Finishing
Surface treatment and finishing according to product, specification and application requirements.
Surface Coating & Plating
Coating, plating and other surface protection treatments according to product and application requirements.
Forming
Bending, forming and other shape modification according to drawings or order requirements.
End Preparation
Beveling, threading, chamfering and other end preparation according to product requirements.
Machining
Turning, drilling, milling and other machining operations where required.
Welding & Fabrication
Welding, fabrication and related assembly according to drawings and project requirements.
Testing & Inspection
Mechanical, chemical and NDT testing per the applicable standard and customer specification.
Customization
Custom dimensions, lengths, surface conditions, end preparations and inspection requirements can be supplied according to project specifications. Final capability is confirmed per enquiry based on grade, size range and applicable standard.
04
Quality
Inspection and documentation procedures are coordinated to meet the requirements of the applicable product standard and the project specification.
- Dimensional inspection Geometry, dimensions and tolerances against the applicable standard
- Visual and surface inspection Surface condition, marking and overall appearance
Documents
- Inspection Report
- Chemical analysis Per heat, against the applicable standard
- Mechanical testing Tensile, yield, elongation and hardness
- Non-destructive testing UT, eddy-current, hydrostatic or other NDT as applicable
- Positive material identification PMI for alloy verification when required
Documents
- Mill Test Certificate (MTC)
- Heat number traceability Heat number carried through MTC and product marking
- Third-party inspection coordination SGS / BV / TÜV on request
Documents
- Third-Party Inspection Report
- EN 10204 documentation 3.1 MTC standard; 3.2 on request
Documents
- EN 10204 3.1 Mill Test Certificate
- EN 10204 3.2 Inspection Certificate
- Certificate of Origin
05
Selection
A well-prepared specification is the most efficient defence against clarification cycles.
- 01 Select material & grade
Choose the material grade according to service conditions, performance requirements and applicable standards.
- 02 Define size & supply condition
Specify the required dimensions, surface condition, heat-treatment condition and delivery requirements.
- 03 Confirm standard & requirements
State the applicable product standard, dimensional standard and governing project specification.
- 04 Define inspection & documentation
Confirm inspection, testing, certification and documentation requirements before order placement.
Example procurement specification
A complete specification suitable for enquiry, covering product, technical requirements, certification and delivery terms.
- Product
- Inconel 625 Tubes & Pipes
- Grade
- Inconel 625
- Standard
- ASTM B444
- Dimensions
- OD 25.4 mm x Wall 2.77 mm x Length 6000 mm; Round; Annealed; or per drawing
- Condition
- Solution Annealed; Annealed & Pickled; Plain End
- Certification
- EN 10204 3.1 Mill Test Certificate
- Quantity
- 20 Metric Tons
- Packaging
- Seaworthy Export Packing
- Incoterm
- CIF Hamburg
06
Logistics
From mill dispatch to destination port, each stage is coordinated with the nominated forwarder and documented against the purchase specification.
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Packaging
Export-suitable packaging with surface and edge protection.
Bundled, wrapped or crated according to product form and transport mode. Outer surface protected with weather-resistant material; ends and edges shielded against transit damage.
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Loading
FCL container for standard sizes; break bulk for oversized cargo.
Container loading via nominated forwarder. LCL and dimensions outside container allowance coordinated against the mill dispatch schedule.
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Documentation
Commercial invoice, packing list and certificate of origin.
Mill documentation travels with the shipment. EN 10204 3.1 / 3.2 certificates and third-party inspection reports provided as per purchase specification.
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Shipment
Sea freight as standard; alternative routes on request.
FCL / LCL container shipment or break bulk for oversized dimensions. Logistics coordinated through the nominated forwarder.
-
Delivery
FOB · CFR · CIF · FCA · EXW arrangements available.
Incoterm 2020. Port of loading: Shanghai / Ningbo / Shenzhen. Final destination and terms confirmed per enquiry.
07
FAQ
Most enquiries reduce to a small set of recurring technical questions.
01 What is Inconel 625?
Inconel 625 (UNS N06625 / NiCr22Mo9Nb / 2.4856) is a nickel-chromium alloy strengthened by molybdenum and niobium additions. It offers exceptional resistance to pitting, crevice and stress-corrosion cracking in chloride-containing environments and is suitable for service from cryogenic temperatures up to approximately 1000 °C.
02 What standards cover Inconel 625 tube and pipe?
Seamless tube and pipe are supplied to ASTM B444 (seamless tube), ASTM B704 (welded tube) and ASTM B705 (welded pipe). Aerospace references include AMS 5581 / AMS 5599. EN 10216-5 and EN 10217-5 are the typical European references for pressure service.
03 What manufacturing methods are available for Inconel 625 tube?
Cold drawn seamless (B444) for tight tolerance and smoother surface, hot finished seamless for larger diameters and heavier walls, and welded and redrawn (B704 / B705) for cost-effective larger sizes where seamless is not required.
04 Is Inconel 625 suitable for seawater and offshore service?
Yes. The high nickel and molybdenum content gives Inconel 625 strong resistance to chloride-induced pitting and crevice corrosion, making it a standard selection for seawater piping, offshore flow lines and marine exhaust systems where 316L stainless is not adequate.
05 Is Inconel 625 weldable?
Yes. Inconel 625 is readily weldable using GTAW, GMAW and other conventional processes with matching Inconel 625 filler (ERNiCrMo-3). Post-weld heat treatment is generally not required for the annealed condition.
06 What temperature range can Inconel 625 tube operate at?
Inconel 625 retains useful mechanical properties from cryogenic temperatures up to approximately 1000 °C in intermittent service and around 650 °C in continuous structural service. Above approximately 1000 °C, oxidation resistance becomes the limiting factor for long-term exposure.