Guardrail & Railing

Guardrail / Railing is general term for metal assemblies for anti‑crash, separation and safety protection. Composed of beams, posts, connectors and fasteners. Main categories: highway crash guardrail, municipal separation railing, bridge guardrail, perimeter fence, building balcony railing. Base materials: Q235B, Q355B carbon steel, 304/316 stainless steel, aluminum alloy. Hot‑dip galvanizing is primary anti‑corrosion finish, plus powder‑coating / dip‑coating. Absorb impact energy by structural deformation for blocking, buffering and separation. Widely used in highways, bridges, urban roads, factories, parks and building platforms, popular export infrastructure product.

Main product distinctions

‑W‑beam guardrail (2‑wave / 3‑wave): Semi‑rigid crash barrier for highways & national roads. Absorb kinetic energy by plastic deformation of beams to redirect vehicles. Two‑wave and three‑wave types, Q235B/Q355B, hot‑dip galvanized, largest export volume. ‑Municipal separation railing: Median separation and pedestrian‑vehicle separation for city roads. Neat appearance with reflective strips, hot‑dip galvanized + powder coated. ‑Bridge crash guardrail: High‑strength rigid barrier for bridge sides, prevent vehicles falling off bridge. High‑grade Q355B steel or stainless‑steel composite. ‑**Zinc‑steel modular railing: Modular bolt‑assembled, minimal welding. For factory perimeter, residential compound, yard fencing, various color options. ‑Stainless‑steel railing: 304 / 316 grade. For coastal, landscape, balcony, boardwalk projects, good salt‑spray resistance, relatively high cost.

Key accessories list

Guardrail beam, cross rail, posts, block spacers, brackets, flange base, splice bolts, connection bolts, gaskets, reflective film, anchor bolts.

1. Main Types

1. By function

‑Crash guardrail: W‑beam, bridge guardrail, withstand vehicle impact. ‑Separation railing: municipal road, factory perimeter for zoning. ‑Safety railing: balcony, staircase, boardwalk for personal fall protection. ‑Landscape railing: riverside & park, combine protection and decoration.

2. By material

‑Q235B carbon steel: general highway & municipal works, cost‑effective. ‑Q355B carbon steel: bridges, high‑risk sections, higher crash‑resistance. ‑304/316 stainless steel: coastal salt‑spray environment. ‑Aluminum alloy: lightweight landscape railing.

3. By anti‑corrosion finish

‑Hot‑dip galvanized: zinc coating 60‑85 μm, preferred for outdoor and export. ‑Hot‑dip galvanized + powder‑coated: dual anti‑corrosion, various colors for municipal & landscape. ‑Dip‑coated: thick coating, good corrosion resistance. ‑Paint finish: low‑cost, poor weather resistance, only for temporary use.

4. Typical dimensions

2‑wave beam: thickness 3.0 mm /4.0 mm; width 310 mm, length 4320 mm. 3‑wave beam: thickness 4.0 mm; width 505 mm. Posts: Φ114×4.5 mm, Φ140×4.5 mm round tube. Municipal railing: height 0.6‑1.2 m, single section length 2‑3 m. Bridge guardrail: height 1.1‑1.4 m.

2. Production Process

Steel coil uncoiling → cold roll forming → CNC cutting → welding of flanges & fittings → straightening & shaping → deburring → hot‑dip galvanizing → (optional powder‑coating / dip‑coating) → inspection of dimension, coating and welds → bundling & wooden‑pallet packing.

3. Key Features

‑W‑beam guardrail: semi‑rigid system, absorbs impact energy via component deformation. Excellent crash‑performance, convenient maintenance, preferred for highway & road projects. ‑Municipal railing: tidy appearance with reflective strips for traffic separation; lower impact‑resistance than W‑beam crash guardrail. ‑Bridge guardrail: high rigidity & strength to prevent vehicle falling; heavy weight, requires solid foundation anchoring. ‑General notes: Hot‑dip galvanizing is standard for export. Bolt grade, actual sheet thickness and zinc‑coating thickness are critical quality indexes. Under‑thickness negative tolerance is forbidden. ‑Limitations: Coating scratches lead to local rust; periodic bolt‑tightening inspection required. Dual coating (HDG + powder coat) recommended for coastal salt‑spray areas.

4. Typical Applications

Crash protection for highways, national & rural roads; bridge side protection; median separation and pedestrian‑vehicle division in cities; factory perimeter fencing; residential compound, balcony & staircase safety; riverside boardwalk and park landscape. Inland ordinary roads: Hot‑dip galvanized Q235B W‑beam guardrail. High‑risk / bridge projects: Q355B. Coastal salt‑spray sites: HDG plus powder‑coating or 304 stainless steel.

5. Standards

‑China: GB/T 31439.1‑2025 W‑beam steel guardrail; JTG D81 Highway traffic‑safety‑facility code; GB/T 37988 Safety standard for protective railings.

6. Selection Guidance

1. Highway crash‑protection: prefer hot‑dip galvanized W‑beam guardrail. 3.0 mm thickness for ordinary sections; 4.0 mm for high‑risk sections.
2. Bridge projects adopt Q355B high‑strength steel; urban road separation: powder‑coated municipal railing.
3. Coastal salt‑spray environment: choose HDG + powder dual‑coating or 304 stainless steel.
4. For export orders verify actual sheet thickness, post wall thickness, zinc‑coating mass, bolt grade and full accessory list. Require MTC and coating‑inspection reports.

Details