GH 3625 Powder

Overview of GH3625 Powder

GH 3625 powder is an age-hardenable nickel-iron base alloy containing 25% chromium along with additions of molybdenum and aluminum. It provides an exceptional combination of high strength, hardness, corrosion resistance, and oxidation resistance at elevated temperatures.

Key properties and advantages of GH3625 powder include:

GH3625 Powder Properties and Characteristics

Properties	Details
Composition	Ni-25Cr-4.5Mo-3.5Al alloy
Density	8.2 g/cc
Particle shape	Predominantly spherical
Size range	15-45 microns
Apparent density	Up to 60% of true density
Flowability	Good
Strength	Very high after aging treatment
Corrosion resistance	Excellent including pitting and crevice corrosion

GH3625 is widely used in aerospace, oil and gas, chemical processing, and power generation sectors needing high strength and corrosion resistance at elevated temperatures.

GH3625 Powder Composition

Typical composition of GH3625 nickel-chromium alloy powder:

GH3625 Powder Composition

Element	Weight %
Nickel	Balance
Chromium	24-27%
Molybdenum	4-5%
Aluminum	3-4%
Carbon	0.1% max
Manganese	1% max
Silicon	0.5% max
Sulfur	0.015% max

• Nickel provides corrosion resistance and aids precipitation hardening
• Chromium significantly improves oxidation and corrosion resistance
• Molybdenum and aluminum facilitate precipitation strengthening
• Carbon and other elements limited as impurities

The composition is optimized to provide peak strengthening from precipitation hardening as well as excellent corrosion and oxidation resistance.

GH3625 Powder Physical Properties

GH3625 Powder Physical Properties

Property	Values
Density	8.2 g/cc
Melting point	1390-1440°C
Thermal conductivity	11 W/mK
Electrical resistivity	52 μΩ-cm
Coefficient of thermal expansion	13.0 x 10^-6 /K

• High density compared to steels and titanium alloys
• Retains high strength at temperatures exceeding 1000°C
• Relatively low thermal conductivity necessitates design considerations
• CTE is moderate and similar to stainless steels

These properties make GH3625 suitable for high strength applications at elevated temperatures needing corrosion resistance.

GH3625 Powder Mechanical Properties

GH3625 Powder Mechanical Properties

Property	Condition	Values
Hardness	Solution annealed	35 HRC
Hardness	Peak aged	50-56 HRC
Tensile strength	Annealed	1000 MPa
Tensile strength	Aged	1500-1800 MPa
Yield strength	Aged	1200-1600 MPa
Elongation	Aged	10-15%

• Ages to very high strength levels exceeding other precipitation hardening alloys
• Retains reasonable ductility in peak aged condition
• Hardness increases substantially after aging treatment
• Strength can be tailored through aging time and temperature

These properties make GH3625 suitable for components needing high strength combined with corrosion resistance.

GH3625 Powder Applications

Typical applications of GH3625 nickel-chromium alloy powder include:

GH3625 Powder Applications

Industry	Uses
Aerospace	Turbine blades, bolts, fasteners
Oil and gas	Wellhead valves, downhole tools
Chemical processing	Extruder screws, valve parts
Power generation	Boiler components, steam and gas turbines

Some specific product applications include:

• Aerospace turbine engine blades, discs and fasteners
• Bolting for high temperature petrochemical piping
• Valve components used in corrosive chemical environments
• Boiler superheater tubes and headers
• Steam turbine blades and fasteners

GH3625 provides exceptional strength and corrosion resistance for critical components used at elevated temperatures across demanding industries.

GH3625 Powder Specifications

Key specifications for GH3625 powder include:

GH3625 Powder Standards

Standard	Description
AMS 5815	Nickel alloy powder compositions
AMS 5408	Wire, rods, and bars of precipitation hardening nickel alloys
AMS 5698	Investment castings of PH nickel alloys
AMS 5772	Nickel alloy forgings
AMS 5634	Nickel alloy extruded shapes

These define:

• Chemical composition limits of GH3625
• Required mechanical properties in different heat treatment conditions
• Approved powder production method – inert gas atomization
• Impurity limits for critical elements
• Compliance testing protocols
• Proper handling and storage instructions

Meeting these certification requirements ensures optimal performance.

GH3625 Powder Particle Sizes

GH3625 Powder Particle Size Distribution

Particle Size	Characteristics
15-25 microns	Ultrafine powder used in laser AM processes
25-45 microns	Size range for most powder bed AM systems
45-75 microns	Larger sizes used in laser cladding

• Finer powder provides higher resolution and surface finish
• Coarser powder suitable for high deposition rate processes
• Size distribution tailored based on AM method used
• Spherical morphology maintained in all sizes

Controlling particle size distribution and morphology is critical for AM performance, final part properties and quality.

GH3625 Powder Apparent Density

GH3625 Powder Apparent Density

Apparent Density	Details
Up to 60% of true density	For spherical powder morphology
4.5 – 5.2 g/cc	Improves with greater packing density

• Spherical powder shape provides high apparent density
• Higher density improves powder flow and bed packing in AM
• Reduces entrapped gas porosity in final part
• Maximizing density minimizes press cycle time

Higher apparent density results in better manufacturing productivity and part performance.

GH3625 Powder Production Method

GH3625 Powder Production

Method	Details
Gas atomization	High pressure inert gas breaks up molten metal stream into fine droplets
Vacuum induction melting	High purity input materials melted under vacuum
Multiple remelting	Improves chemical homogeneity
Sieving	Classifies powder into different particle size fractions

• Gas atomization with inert gas produces clean spherical powder
• Vacuum processing minimizes gaseous impurities
• Multiple remelts improve uniformity of composition
• Post-processing provides particle size distribution control

Automated methods combined with strict quality control result in consistent GH3625 powder suitable for critical applications.

GH3625 Powder Pricing

GH3625 Powder Pricing

Factor	Impact on Price
Powder grade	Higher purity increases cost
Particle size	Ultrafine powder more expensive
Order quantity	Price decreases with larger volumes
Production method	Multiple remelts increase cost
Packaging	Special packing raises cost

Indicative Pricing

• GH3625 powder: $100-150 per kg
• Large volume pricing can be 30%+ lower

Pricing depends on purity, particle size, production method, order volume, packaging and delivery requirements.

GH3625 Powder Suppliers

GH3625 Powder Suppliers

Company	Location
Sandvik Osprey	UK
Carpenter Additive	USA
Erasteel	Sweden
Aubert & Duval	France
cn.koowe.powder	China
Shanghai STAL Precision	China

Selection factors for suppliers:

• Powder grades produced and particle sizes offered
• Production capacity and lead times
• Quality control, consistency and compliance
• Technical expertise and customer support
• Pricing levels based on order volumes
• Experience serving the targeted industry

GH3625 Powder Handling and Storage

GH3625 Powder Handling

Recommendation	Reason
Ensure proper ventilation	Avoid exposure to fine metallic particles
Use appropriate PPE	Prevent accidental inhalation or ingestion
Follow safe protocols	Reduce health and fire hazards
Store sealed containers	Prevent contamination or oxidation

GH3625 powder is relatively stable but general precautions are still recommended for safe handling and maintaining purity.

Storage Recommendations

• Store in stable containers in a dry, cool area
• Limit exposure to moisture which can degrade properties
• Maintain temperatures below 30°C

Proper precautions preserve powder condition and prevent safety issues.

GH3625 Powder Inspection and Testing

GH3625 Powder Testing

Test	Details
Chemical analysis	OES or XRF spectroscopy used to verify composition
Particle size distribution	Laser diffraction analysis
Apparent density	Measured as per ASTM B212 standard
Powder morphology	SEM imaging of particle shape
Flow rate analysis	Gravity flow rate through specified nozzle
Moisture measurement	Loss on drying analysis

Testing ensures the powder meets the required chemical purity, particle characteristics, density specifications, morphology and flowability per relevant standards.

GH3625 Powder Pros and Cons

Advantages of GH3625 Powder

• Exceptional high temperature strength and creep resistance
• Retains strength and hardness up to 1100°C
• Excellent corrosion resistance across environments
• Good fatigue strength and fracture toughness
• High hardness combined with reasonable ductility
• Less dense than nickel superalloys

Limitations of GH3625 Powder

• More expensive than stainless steel powders
• Requires controlled heat treatment for optimal properties
• Lower wear resistance than cobalt alloys
• Difficult to machine after sintering
• Limited cold heading and forming capability
• Subject to pitting in strongly oxidizing acids

Comparison With Inconel 718 Powder

GH3625 vs Inconel 718 Powder

Parameter	GH3625	Inconel 718
Density	8.2 g/cc	8.2 g/cc
Strength	Higher	Lower
Corrosion resistance	Excellent	Outstanding
Cost	Moderate	Very high
Uses	Oil and gas, chemical processing	Aerospace, nuclear

• GH3625 provides higher tensile strength
• Inconel 718 offers better overall corrosion resistance
• GH3625 is more cost effective
• Inconel 718 is preferred for extreme environments
• GH3625 provides optimal strength and cost balance

GH3625 Powder FAQs

Q: What are the main applications of GH3625 nickel alloy powder?

A: Main applications include aerospace turbine components, oil and gas wellhead valves and downhole tools, power generation parts, chemical processing equipment, and other high temperature components needing strength and corrosion resistance.

Q: Why is GH3625 preferred over stainless steel powders in high temperature applications?

A: GH3625 retains significantly higher strength compared to stainless steels at temperatures exceeding 650°C. It also provides excellent corrosion resistance in hot corrosive environments.

Q: What precautions should be taken when working with GH3625 powder?

A: Recommended precautions include ventilation, appropriate PPE, avoiding ignition sources, following safe handling protocols, and storing sealed containers away from moisture, air, and contamination.

Q: How does aluminum affect the properties of GH3625 alloy?

A: Aluminum enhances precipitation hardening by forming nickel-aluminum precipitates during aging treatment. This provides substantial strengthening while maintaining reasonable ductility.