4140 Steel Build Platform - AMS 6395 - ASTM A829 - UNS G41400
4140 steel plate (AMS 6395) is an aircraft-quality, chromium-molybdenum alloy steel prized for its exceptional strength, toughness, and hardenability. Engineered for demanding environments, this grade offers superior resistance to fatigue and wear, making it a reliable choice for structural and mechanical components that require durability under stress. Its alloy composition ensures consistent performance in applications where precision and resilience are critical.
Supplied in normalized or heat-treated conditions, 4140 steel delivers an excellent balance of strength, ductility, and machinability, allowing for efficient fabrication and finishing. It can be further heat-treated to achieve hardness levels up to 50 HRC in thinner sections, providing versatility for parts that demand high hardness without sacrificing toughness. This combination of properties makes 4140 ideal for aerospace, defense, oil and gas, and other industries where performance and reliability are non-negotiable.
- Inventory & Specs
- Chemical Composition
- Physical Properties
- Mechanical Properties
- Datasheet
- Additional Info
- FAQs
Advanced Inventory Size Ranges for 4140
| Type | Size Range | Specifications | Get a Quote |
|---|---|---|---|
| Build Platforms | 0.500" - 5.000" | AMS 6395, ASTM A829, UNS G41400 | Get a Quote |
Ideal for Additive Manufacturing Build Platforms
In Powder Bed Fusion (PBF) systems, platform rigidity and thermal stability are critical for maintaining part integrity and dimensional accuracy. 4140 steel offers exceptional strength and toughness, ensuring a stable surface through repeated thermal cycles and heavy build loads. Its excellent hardenability and wear resistance make it a reliable choice for demanding environments where precision and durability are essential—such as aerospace, defense, energy, and industrial applications.
Why Choose United Performance Metals?
At United Performance Metals, we manufacture 4140 Steel Build Platforms to exacting standards, offering:
- Superior Strength & Stability: Maintains flatness and structural integrity under high thermal and mechanical stresses.
- Excellent Machinability & Weldability: Enables precision finishing for optimal powder bed performance.
- Heat-Treatable for Enhanced Hardness: Achieve hardness levels up to 50 HRC for extended platform life.
- Custom Sizes: Available to fit your specific PBF machine requirements.
Other industry standards we comply with:
Common Trade Names
- AISI 4140, SAE 4140
Industry Applications for 4140
- Landing Gear Components
- Structural Fittings
- Drill Collars
- Turbine Shafts
- Machine Bases
Chemical Composition
| Element | Percent by Weight Min | Percent by Weight Max | |
|---|---|---|---|
| C | Carbon | 0.38 | 0.43 |
| Mn | Maganese | 0.75 | 1.00 |
| Si | Silicon | 0.15 | 0.35 |
| Cr | Chromium | 0.80 | 1.10 |
| Mo | Molybdenum | 0.15 | 0.25 |
| P | Phosphorous | 0.035 | |
| S | Sulfur | 0.040 | |
| Fe | Iron | Balance | |
Physical Properties
| Property | Values |
|---|---|
| Density | 7.85 g/cm³ |
| Modulus of Elasticity | 190–210 GPa |
| Thermal Expansion | 12.2 μm/m-°C |
| Thermal Conductivity | ~42 W/m·K |
| Poisson's Ratio | 0.27–0.30 |
Mechanical Properties
| Condition | Tensile (MPa) | Yield (MPa) | Hardness |
|---|---|---|---|
| Annealed | 655–785 | 415–585 | ~197 HB |
| Normalized | 710–850 | 470–630 | ~229 HB |
| Quenched & Tempered | 835–1080 | 655–900 | 45–50 HRC |