AMS 5599 / Alloy 625 Sheet, Strip & Plate – ZYTC Alloy Manufacturer and Supplier

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AMS 5599 is the SAE/AMS specification for corrosion- and heat-resistant nickel alloy sheet, strip, and plate (nominally up to 1.000 inch / 25.4 mm thick) produced to Alloy 625 chemistry in the annealed/solution treated condition. This specification is commonly issued with revision letters (e.g., AMS 5599H / AMS 5599J) and is the aerospace-grade sheet/plate specification used by industry to ensure consistent chemistry, mechanical properties, and traceability for UNS N06625 material .

Alloy 625 (AMS 5599, UNS N06625) is a nickel-based superalloy with excellent resistance to oxidation and corrosion. The nickel-chromium matrix is reinforced by the addition of molybdenum and niobium through solid-solution strengthening. This allows Alloy 625 to maintain high strength and toughness at temperatures ranging from cryogenic up to 982°C (1800°F). It is non-magnetic, austenitic, and displays high tensile strength, fabricability, and brazeability. Due to its high nickel content, this alloy is nearly immune to chloride ion stress-corrosion cracking and pitting, which is commonly found in thin-walled seawater applications like heat exchangers, fasteners, and cable sheathing.

📩 Request a quote:
📧 daisy@zytcsteel.com
📲 +86 17335753350 (WhatsApp/WeChat)
🌐 https://www.zytcalloys.com/product-AMS-5599-Alloy-625-Sheet-Strip-Plate-Factory-Price.html

1. Product Specifications & Physical Data

Alloy 625 sheet, strip, and plate are available in the annealed condition for forming and fabrication into high-temperature components. The combination of molybdenum and niobium provides exceptional solid-solution strengthening without the need for precipitation hardening heat treatment.

  • Available Forms: Sheet, strip, plate (up to 1.000″ / 25.4 mm); also round bar, flat bar, extruded section, pipe, tube, hexagon, forging stock, wire .

  • Specifications: AMS 5599, ASTM B443, ASME SB-443, UNS N06625, Werkstoff Nr. 2.4856 .

Chemical Composition (Weight %)Alloy 625 Specification
Nickel (Ni)58.0 min. (Balance)
Chromium (Cr)20.0 - 23.0
Molybdenum (Mo)8.0 - 10.0
Niobium (Nb)3.15 - 4.15
Iron (Fe)5.0 max.
Manganese (Mn)0.50 max.
Silicon (Si)0.50 max.
Carbon (C)0.10 max.
Aluminum (Al)0.40 max.
Titanium (Ti)0.40 max.
Cobalt (Co)1.0 max.
Phosphorus (P)0.015 max.
Sulfur (S)0.015 max.


Physical PropertiesMetricImperial
Density8.44 g/cm³0.305 lb/in³
Melting Range1290 - 1350°C2350 - 2460°F
Modulus of Elasticity (RT)207 GPa30.0 × 10⁶ psi
Thermal Conductivity (RT)9.8 W/m·K68 BTU·in/hr·ft²·°F
Coefficient of Expansion (20-100°C)12.8 µm/m·°C7.1 µin/in·°F
Electrical Resistivity1.29 µΩ·m1.29 µΩ·m


Mechanical Properties (Sheet/Plate – Annealed)MetricImperial
Tensile Strength (min.)827 MPa120 ksi
Yield Strength (0.2% offset, min.)414 MPa60 ksi
Elongation (min.)30%30%
Hardness (Annealed)150-220 HB150-220 HB


High-Temperature Tensile Strength (Typical)MetricImperial
540°C (1000°F)690 MPa100 ksi
650°C (1200°F)620 MPa90 ksi
760°C (1400°F)520 MPa75 ksi
870°C (1600°F)340 MPa49 ksi
980°C (1800°F)170 MPa25 ksi


2. Operating Conditions & Selection Criteria

Alloy 625 sheet, strip, and plate are specified when designers require a material with high strength, excellent corrosion resistance, and good fabricability across a wide temperature range.

  • Service Temperature Range: Suitable for continuous operation from cryogenic temperatures up to 982°C (1800°F); maintains high strength and toughness throughout this range .

  • Strengthening Mechanism: Solid-solution strengthened by molybdenum and niobium in the nickel-chromium matrix; no precipitation hardening heat treatment required .

  • Corrosion Resistance: Excellent resistance to a wide range of corrosive environments, including seawater, acids, and alkalis .

  • Chloride SCC Immunity: Nearly immune to chloride ion stress-corrosion cracking and pitting due to high nickel content .

  • Non-Magnetic: Austenitic structure ensures non-magnetic properties .

  • Fabricability: High tensile strength combined with excellent fabricability and brazeability .

  • Oxidation Resistance: Good resistance to oxidation up to 982°C (1800°F) .

3. Fabrication & Material Comparison

  • Annealing: 954-1038°C (1750-1900°F), water quench or rapid air cool; supplied in this condition .

  • Hot Working: 954-1205°C (1750-2200°F); reheat as necessary .

  • Cold Working: Good formability; can be cold rolled, bent, and stamped .

  • Machining: Good machinability; requires sharp tools and adequate lubrication; work-hardening rate moderate .

  • Welding: Excellent weldability using GTAW (TIG), GMAW (MIG), and resistance welding; matching filler metal (ERNiCrMo-3) recommended .

Material ComparisonAlloy 625Alloy 600Alloy 825316L Stainless
Nickel Content58% min.72% min.38-46%10-14%
Molybdenum Content8-10%—2.5-3.5%2-3%
Niobium Content3.15-4.15%———
Tensile Strength (min.)120 ksi80 ksi85 ksi70 ksi
Chloride SCC ResistanceExcellentExcellentExcellentPoor
Pitting ResistanceExcellentGoodGoodModerate
Max Service Temp982°C1093°C540°C870°C
Non-MagneticYesYesYesYes
Primary UseSeawater, chemical, aerospaceNuclear, causticSour gas, acidGeneral marine

Applications

  • Seawater Service: Heat exchangers, thin-walled seawater components, fasteners, cable sheathing (immune to chloride SCC and pitting)

  • Aerospace: Aircraft engine components, turbine blades, combustion chamber parts, propulsion system components

  • Chemical Processing: Reactor vessels, heat exchangers, piping systems, valves, pumps

  • Marine Engineering: Seawater piping systems, offshore platform components

  • Oil & Gas: Downhole tubing, wellhead equipment, sour gas service

  • Pollution Control: Flue gas desulfurization (FGD) scrubbers, stack liners

  • Nuclear: Reactor core components, control rod mechanisms

Contact ZYTC Alloy for certified AMS 5599 Alloy 625 sheet, strip, and plate with complete traceability, EN 10204 3.1/3.2 certificates, and factory pricing. Available in thicknesses up to 1.000 inch (25.4 mm) for aerospace, marine, chemical, and high-temperature industrial applications. Prompt inventory dispatch from China with mill-certified stock. Also available in round bar, flat bar, pipe, tube, forging stock, extruded sections, and wire. Contact our sales team for current stock availability and technical support.

📩 Request a quote:
📧 daisy@zytcsteel.com
📲 +86 17335753350 (WhatsApp/WeChat)
🌐 https://www.zytcalloys.com/product-AMS-5599-Alloy-625-Sheet-Strip-Plate-Factory-Price.html

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