Furniture Standards — Metal Materials (2026 Edition)

Cold-Rolled Steel (CRS)
Cold-rolled steel is a high-strength, high-precision structural metal valued for its rigidity, dimensional accuracy, and smooth finish. The cold-reduction process produces uniform thickness and excellent surface quality, giving CRS predictable performance in bending, welding, and fabrication. Its mechanical profile—strong, stiff, tough, and consistently ductile—makes it suitable for most frame geometries and load-bearing structures. Its primary limitation is corrosion. Unprotected steel oxidizes readily when exposed to moisture or salts, so long-term performance requires a protective finish such as powder coating, paint, or galvanizing. Once properly sealed, CRS delivers long service life and approaches the functional performance of stainless steel in many controlled environments. CRS provides one of the best combinations of strength, stability, manufacturability, and cost, making it a practical standard for premium furniture frames where structural integrity and precise tolerances matter.

Stainless Steel 304
Stainless Steel 304 is the standard austenitic stainless used in premium furniture because it combines high strength, excellent ductility, clean fabrication, and reliable corrosion resistance at a reasonable cost. It stays dimensionally stable across temperature shifts and gains additional strength when cold-worked, making it well-suited for structural frames, hardware, and precision components. Its main limitation is chloride exposure: environments with high chloride levels can cause pitting or crevice corrosion over time, where 316 becomes the preferred grade. For most applications, 304 provides long service life, high toughness, and a clean stainless appearance with minimal upkeep.

Stainless Steel 316
Stainless Steel 316 is a premium austenitic alloy strengthened with molybdenum, giving it much higher resistance to chlorides, pitting, and chemical attack than 304. It maintains excellent dimensional stability, strong mechanical performance, and high ductility across a wide temperature range. Its passive film provides exceptional corrosion durability with very little maintenance. 316 offers greater reliability than 304 in chloride-rich or chemically demanding conditions, which is why it is chosen for high-performance stainless components. Its primary drawback is cost—316 is significantly more expensive, and welded sections require the low-carbon 316L variant. When maximum corrosion resistance is required, 316 is the preferred stainless grade.

Extruded Aluminum (6063 Alloy)
Extruded aluminum is a precision-friendly structural alloy valued for its light weight, corrosion resistance, and ability to form accurate hollow profiles. Its magnesium–silicon chemistry allows clean, consistent extrusion, enabling tight tolerances, smooth surfaces, and complex geometries that are difficult to produce in steel. Although not as strong as steel, 6063 provides excellent stiffness-to-weight performance and maintains dimensional stability across typical furniture temperature ranges. It naturally forms a protective oxide layer, and performance improves significantly with powder coating or anodizing, both of which increase corrosion resistance and long-term finish retention. Thin-walled extrusions can deform under sustained high loads, so proper wall design and internal support are important. When engineered correctly, extruded aluminum offers a high level of structural efficiency, long service life, and exceptional design flexibility for many furniture categories.

Cast Aluminum
Cast aluminum is a lightweight alloy used when complex or decorative shapes are needed. Its silicon-rich composition allows metal to flow cleanly into molds, producing stable, dimensionally accurate parts. Strength is moderate, and performance depends on casting quality—porosity can reduce ductility, fatigue life, and impact toughness, though heat treatments like T6 improve consistency. It is less ductile than extruded aluminum but well-suited for intricate forms and moderate structural loads. A natural oxide film provides basic protection, and coatings are typically applied for best long-term durability. Cast aluminum is chosen when shape flexibility and low weight matter more than maximum mechanical strength.

Brass (C26000 – Cartridge)
Brass (C26000) is a copper–zinc alloy valued for its formability, decorative appearance, and stable mechanical behavior. It machines cleanly, holds tight tolerances, and provides a good balance of strength, ductility, and corrosion resistance for hardware, fittings, and accent components. Its limitations stem from chemistry: the alloy can tarnish, lose zinc in certain chemical environments, and is not suited for high-load structural frameworks. When used within appropriate mechanical and environmental limits, brass delivers long-term reliability and a refined visual finish.

Iron (Low-Carbon)
Low-carbon iron is a mostly pure iron alloy with very small carbon content, giving it high ductility, good formability, and stable mechanical behavior. It machines and shapes well, holds its dimensions reliably under load, and offers solid toughness and impact resistance across a broad temperature range.
Its limitation is corrosion: unprotected iron reacts quickly with moisture and oxygen, so long-term performance depends entirely on coatings or surface treatments. When properly finished and maintained, low-carbon iron provides strong, durable performance for structural, decorative, and architectural components.

Coatings
Metal finishes vary widely in performance and purpose. Powder coat is the standard polymer finish for most metals, providing continuous film protection, strong adhesion, and good resistance to abrasion, UV exposure, and wear, with super-durable formulations offering longer color and gloss retention. On steel and iron, corrosion protection increases dramatically when powder coat is paired with an e-coat primer or zinc-rich primer, which help prevent underfilm rust and improve adhesion in complex geometries. Aluminum can also be finished through anodizing, which forms a non-peeling oxide layer; Type II supports decorative colors, while Type III offers higher abrasion resistance. Steel may also be protected through hot-dip galvanizing, which deposits a thick zinc layer for long corrosion life, though with a characteristic texture. Premium options such as clear nano-ceramic topcoats or FEVE/PVDF fluoropolymers offer exceptional durability, chemical resistance, and UV stability, but are typically reserved for environments or applications where maximum longevity justifies the added cost.

Surface Treatments
Mechanical treatments such as polishing, brushing, and burnishing shape the metal’s surface through abrasion to create either reflective or matte textures, often serving as a prep step before coating. Chemical conversion processes—including phosphates and chromate-free treatments—form thin, bonded layers that improve adhesion and slow underfilm corrosion, especially on steel and aluminum. Passivation enhances stainless steel by removing free iron and strengthening its chromium-oxide film without altering appearance. Heat treatments adjust grain structure to tune strength, ductility, or toughness in metals such as steel and aluminum, preparing them for forming or finishing but not providing corrosion protection on their own.

Metallic Overlays
Metallic overlays enhance metal durability by adding or forming protective surface layers. Hot-dip galvanizing immerses steel or iron in molten zinc to create a thick, sacrificial coating that resists corrosion but leaves a coarse industrial texture. Zinc thermal spray provides similar protection with a smoother finish and better coverage of complex shapes, making it adaptable and powder-coat friendly. Electroplating applies thin layers of zinc, nickel, or chrome for decorative or light-duty protection, commonly used on hardware rather than structural components. Cladding bonds a corrosion-resistant metal layer—such as stainless steel—onto a lower-cost core, offering premium performance in specialized applications. Diffusion coatings such as aluminizing or nitriding modify the metal surface itself to improve hardness, wear resistance, or oxidation behavior without creating a peelable film.