Metal Bench Frame (Frame Only): What Buyers Should Know in 2025

If you’re specifying outdoor furniture for parks or high-traffic streetscapes, you already know the stakes: durability, anti-corrosion performance, and clean lines that don’t shout for attention. The Metal Bench Frame/Park Bench Legs/Iron Bench legs/Bench Frame/Bench ends/Frame Only from Hebei (Room 1005, Building 1-2, North China Golden Sun Commercial City, Xinhuanan Road, Xiangdu District, Xingtai City) is, to be honest, one of those under-the-radar components that quietly carry the project.

Industry Trends and Where This Frame Fits

We’re seeing cities standardize on modular, repairable systems—swap a slat, not the whole bench. Also, powder coating with ISO 12944 guidance is edging out older bitumen-only finishes. For designers, the sweet spot is ductile iron frames with interchangeable hardwood or recycled-plastic slats. In practice, these frames slot into outdoor furniture suites for parks, campuses, transit hubs, waterfronts, retail promenades—anywhere the public lingers.

Product Snapshot and Specs

Material is ductile iron (nodular graphite iron) with either black bitumen coat or powder-coat finish—classic municipal spec. Frame-only means you pair with your own slats (IPE, heat-treated pine, WPC, recycled HDPE… pick your poison).

Note: site conditions (coastal, de-icing salts) may require C4/C5 coating systems per ISO 12944.

How It’s Made (Process Flow)

1. Material & casting: ductile iron melt, controlled Mg treatment; sand mold casting.
2. Heat treatment: normalize/anneal to stabilize microstructure.
3. Surface prep: shot-blast SA 2.5; degrease; phosphate (powder route).
4. Coating: black bitumen dip or polyester powder (TGIC-free), oven cure.
5. QC tests: coating thickness, cross-hatch adhesion, 500 h salt-spray, 3–6 kN static load, tip stability per EN 581-1.

Applications, Advantages, and Feedback

Common scenarios: municipal parks, riverwalks, BRT stations, university quads, mall plazas, theme parks. Advantages? Load-bearing ductile iron, simple replaceable slats, and predictable maintenance cycles. One municipal buyer told me, “We’ve replaced two slats in three years—frames still look new,” which, frankly, is the kind of boring reliability you want in outdoor furniture.

Customization Options

• Color: RAL powder palette; dual-coat for coastal C4/C5.
• Logo: cast-in or laser tag plates.
• Mounting geometry: bolt-hole layout, foot size, anti-skate nubs.
• Slat interfaces: hardwood/WPC/HDPE slot widths and spacings.

Vendor Comparison (Quick Look)

Case Notes

A city boulevard pilot (North China) deployed 120 frames with WPC slats; lab-coated to ≈ 80 μm powder, they hit 500 h salt spray with no blistering. Another coastal resort chose dual-coat (zinc-rich primer + polyester top) and reports steady color after two summers—UV holding strong, which matters for hospitality-grade outdoor furniture.

Buying Checklist

• Ask for coating spec with ISO 12944 category and measured thickness.
• Confirm anchor pattern and site substrate (concrete class, edge distances).
• Request load-test data (≥ 3 kN static) and salt-spray hours.
• Verify warranty terms (finish vs. structural) and spare-part policy.

Bottom line: solid ductile iron frames paired with the right coating spec will outlast the budget cycle—and that’s the most cost-effective kind of outdoor furniture.

Authoritative references

1. ASTM A536: Standard Specification for Ductile Iron
2. ISO 12944: Corrosion protection of steel structures by protective paint systems
3. ISO 9227: Corrosion tests in artificial atmospheres — Salt spray tests
4. ASTM B117: Standard Practice for Operating Salt Spray (Fog) Apparatus
5. EN 581-1: Outdoor furniture — Seating and tables — Safety, strength and durability