GH 3625 Powder
GH3625 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.
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Table of Contents
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.
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