AMS 5581 / UNS N06625 / Alloy 625 Seamless Tube – Factory Price | ZYTC Alloy Manufacturer & Supplier
AMS 5581 specification covers a corrosion- and heat-resistant nickel alloy in the form of seamless or welded tubing (two types). Alloy 625 (UNS N06625) is a nickel-chromium-molybdenum alloy with an addition of niobium (columbium).
The addition of molybdenum acts with the niobium to stiffen the alloy matrix, providing high strength without a strengthening heat treatment. The alloy resists a wide range of corrosive environments and has excellent resistance to pitting and crevice corrosion.
ZYTC Alloy is a trusted ZYTC Alloy Manufacturer and Supplier, offering AMS 5581 Alloy 625 seamless tubes at factory-direct prices with fast lead times.
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Key Features – Alloy 625 Seamless Tube
✅ High strength without heat treatment – Stiffened matrix from molybdenum + niobium
✅ Excellent corrosion resistance – Resists a wide range of corrosive environments
✅ Outstanding pitting & crevice corrosion resistance – Ideal for aggressive media
✅ Good oxidation resistance – Performs well at elevated temperatures
✅ Excellent fabricability – Can be welded and formed
✅ Fatigue and thermal fatigue resistance – Suitable for cyclic service conditions
✅ Seamless or welded options – AMS 5581 covers both types
Chemical Composition – Alloy 625 (UNS N06625) per AMS 5581
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 58.0 min |
| Chromium (Cr) | 20.0 – 23.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Niobium (Nb) + Tantalum (Ta) | 3.15 – 4.15 |
| Iron (Fe) | 5.0 max |
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 0.50 max |
| Silicon (Si) | 0.50 max |
| Aluminum (Al) | 0.40 max |
| Titanium (Ti) | 0.40 max |
| Phosphorus (P) | 0.015 max |
| Sulfur (S) | 0.015 max |
The addition of molybdenum and niobium creates a stiffened matrix, providing high strength without the need for precipitation hardening heat treatments.
Mechanical Properties – Alloy 625 Seamless Tube (AMS 5581)
| Property | Typical Value |
|---|---|
| Tensile Strength | 120 ksi min (827 MPa) |
| Yield Strength (0.2% offset) | 60 ksi min (414 MPa) |
| Elongation | 30% min |
| Hardness (Rockwell B) | 85 – 95 HRB |
| Modulus of Elasticity | 29.8 x 10³ ksi (205 GPa) |
| Density | 0.305 lb/in³ (8.44 g/cm³) |
| Melting Range | 2350 – 2460°F (1290 – 1350°C) |
Applications – AMS 5581 Alloy 625 Seamless Tube
ZYTC Alloy supplies Alloy 625 seamless tubes for demanding applications across multiple industries:
Aerospace Industry (Primary Focus)
| Component | Application Details |
|---|---|
| Aircraft engine components | Turbine blades, turbine discs, gas turbine blades |
| Combustion chamber components | Withstands high-temperature and high-pressure combustion environments, ensuring stable combustion chamber operation |
| Aerospace propulsion systems | Key components of jet engines and rocket engines, ensuring efficient and stable propulsion system operation |
Additional Industries
| Industry | Applications |
|---|---|
| Chemical Processing | Reactors, heat exchangers, piping systems |
| Marine Engineering | Seawater piping, propeller blades, pumps |
| Oil & Gas | Downhole tubing, risers, flow lines |
| Pollution Control | Scrubbers, ducting, stack liners |
| Nuclear Reactors | Core components, control rod mechanisms |
Product Forms & Availability – Alloy 625 (UNS N06625)
ZYTC Alloy offers Alloy 625 in a wide range of product forms:
| Product Form | Availability |
|---|---|
| Seamless Tube | AMS 5581 – various diameters and wall thicknesses |
| Welded Tube | AMS 5581 – various diameters and wall thicknesses |
| Round Bar | Full range |
| Flat Bar | Custom sizes |
| Hexagon | Standard and custom |
| Pipe | Seamless and welded |
| Plate | Various thicknesses |
| Sheet & Strip | Various gauges |
| Extruded Section | Custom profiles |
| Forging Stock | Any size for further processing |
| Wire | Various gauges |
Contact sales for stock lists, plate stock lists, or further availability.
Specifications – Alloy 625 Seamless Tube
| Specification | Description |
|---|---|
| AMS 5581 | Seamless or welded tubing – corrosion and heat resistant |
| UNS N06625 | Unified numbering system designation |
| ASTM B444 | Standard specification for seamless tube |
| ASTM B704 | Standard specification for welded tube |
| NACE MR0175 | Sour service applications |
ZYTC Alloy – Your Reliable Manufacturer & Supplier
As both a ZYTC Alloy Manufacturer and ZYTC Alloy Supplier, we control quality from melt to finished product. Our vertical integration ensures:
Factory-direct pricing – No middlemen, lower costs
Full material traceability – Mill test certificates (MTC) available
Flexible production runs – From small lots to bulk orders
Short lead times – Stock and made-to-order options
Global shipping – Reliable logistics to B2B buyers worldwide
Aerospace-grade quality – AMS 5581 certified
Factory Price – AMS 5581 Alloy 625 Seamless Tube (UNS N06625)
Indicative factory pricing (FOB China):
| Tube Type | Diameter Range | Wall Thickness | Price (USD/kg) |
|---|---|---|---|
| Seamless | 1/4″ – 2″ (6.35mm – 50.8mm) | 0.028″ – 0.250″ | 75 |
| Seamless | 2″ – 6″ (50.8mm – 152.4mm) | 0.065″ – 0.500″ | 70 |
| Welded | 1/4″ – 6″ (6.35mm – 152.4mm) | 0.028″ – 0.500″ | 60 |
Delivery Lead Times (after pre-payment confirmation)
| Stock Status | Delivery Time |
|---|---|
| Products in stock | Within 3 days |
| Raw material in stock | Within 10 days |
| Re-melting required | 15 – 25 days |
Why Choose ZYTC Alloy for AMS 5581 Alloy 625 Seamless Tube?
| Advantage | Benefit |
|---|---|
| ✅ Factory direct pricing | Lower cost, better margins |
| ✅ AMS 5581 certified | Full compliance with aerospace-grade specs |
| ✅ Verified chemical & mechanical properties | Mill test reports included |
| ✅ High-strength without heat treatment | Molybdenum + niobium matrix stiffening |
| ✅ Excellent corrosion resistance | Pitting, crevice, and general corrosion protection |
| ✅ Aerospace industry focus | Turbine blades, combustion chambers, propulsion systems |
| ✅ Wide product availability | Tube, bar, pipe, plate, sheet, strip, wire, and more |
| ✅ Fast global shipping | Reduced downtime and inventory costs |
Contact ZYTC Alloy Today
Request a quote for AMS 5581 / UNS N06625 / Alloy 625 Seamless Tube. Please provide:
Tube type (seamless / welded)
Outside diameter (OD) and wall thickness
Length required (cut lengths or random lengths)
Quantity (kg or pieces)
Destination port
Any special certification or finish requirements
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