Description
Overview Of 304/304L
304 stainless steel powder is a widely used austenitic stainless steel known for its excellent corrosion resistance, formability, and weldability. As a powder, it is commonly employed in additive manufacturing (e.g., 3D printing), metal injection molding (MIM), and thermal spray coatings. Its balanced composition makes it suitable for applications requiring durability in mildly corrosive environments.
Powder Chemical Composition(wt,-%)
The chemical composition of 304 stainless steel powder typically adheres to the ASTM A276/A240 standard:
| Element | Content (wt%) |
| Chromium (Cr) | 18.0–20.0% |
| Nickel (Ni) | 8.0–10.5% |
| Carbon (C) | ≤0.08% |
| Manganese (Mn) | ≤2.0% |
| Silicon (Si) | ≤1.0% |
| Phosphorus (P) | ≤0.045% |
| Sulfur (S) | ≤0.03% |
| Iron (Fe) | Balance |
Mechanical Properties
Typical mechanical properties of sintered or 3D-printed 304 stainless steel components:
| Property | Value |
| Tensile Strength | 515–620 MPa (75–90 ksi) |
| Yield Strength (0.2% offset) | ≥205 MPa (30 ksi) |
| Elongation at Break | ≥40% |
| Hardness (Annealed) | 70–90 HRB (Rockwell B) |
| Density | 7.9–8.0 g/cm³ |
| Melting Point | 1400–1450°C (2552–2642°F) |
Advantages
● Corrosion Resistance: Resists oxidation and organic acids (e.g., in food or mild chemical environments).
● High Ductility: Easily formed, welded, or machined into intricate shapes.
● Cost-Effective: Lower nickel content compared to 316L, ideal for non-marine applications.
● Biocompatibility: Suitable for medical tools and non-implant devices after proper surface treatment.
Limitations
● Not recommended for chloride-rich environments (e.g., seawater) due to risk of pitting corrosion.
● Lower high-temperature strength compared to martensitic or duplex stainless steels.
Primary Applications
● Additive Manufacturing: Produces complex parts for automotive, aerospace, and consumer goods.
● Metal Injection Molding (MIM): Fabricates small precision components like fasteners, connectors, and gears.
● Thermal Spray Coatings: Enhances corrosion resistance of industrial machinery and pipelines.
● Food Processing Equipment: Used for tanks, valves, and mixers due to FDA compliance and cleanability.
● Architectural Components: Decorative fixtures, railings, and façades requiring aesthetic polish.
