Hot dip galvanized bolt

Name: Solar Channel Production Video 7
Uploaded: 2025-07-29T03:11:12+08:00
Description: 1. Basic Definition Hot-dip galvanized bolts are fasteners subjected to pre-treatments (degreasing, pickling, fluxing)

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Product Description

Product Attributes

Brand: chunpeng

Packaging & Delivery

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Product Description

1. Basic Definition

Hot-dip galvanized bolts are fasteners subjected to pre-treatments (degreasing, pickling, fluxing) and immersed in molten zinc (≈450°C), forming a zinc-iron alloy layer on the surface. The coating thickness (typically 50–150 μm) significantly exceeds that of electro-galvanizing, making it suitable for harsh environments.

2. Key Features**

Superior Corrosion Resistance**: The zinc layer forms a dense zinc carbonate barrier in air, isolating corrosive agents. Damaged areas are protected via "sacrificial anode" corrosion protection.

Stable Mechanical Properties**: The coating bonds firmly to the substrate without compromising strength grades (e.g., 4.8, 8.8, 10.9).

Extended Service Life**: 20–30 years in general atmospheres; 10–15 years in marine/industrial environments.

Appearance**: Gray surface with possible spangle patterns (crystallization marks), slightly coarse texture.

3. Process Flow**

Pre-treatment**: Degreasing (oil removal) → Pickling (oxide removal) → Fluxing (prevents re-oxidation).

Hot-Dip Galvanizing**: Immersion in molten zinc to form coating.

Post-treatment**: Centrifugal removal of excess zinc → Cooling → Passivation (optional; enhances corrosion resistance).

4. Classification & Standards**

By Strength Grade**: Commercial grade (4.8, 5.8); High-strength grade (8.8, 10.9).

By Head Type**: Hex head, round head, square head, etc.

Standards:

- GB/T (China): E.g., GB/T 5782 (hex bolts), GB/T 41 (hex nuts).

- ISO: ISO 4014, ISO 4032.

- ASTM** (U.S.): ASTM A325 (high-strength structural bolts).

5. Applications

- Outdoor Infrastructure: Power transmission towers, bridges, highway guardrails.

- Building Structures: Steel-framed buildings, curtain wall connections.

- Marine Engineering: Docks, vessels (requires supplementary corrosion protection).

- Municipal Engineering: Streetlights, traffic sign supports.

Chunpeng Group is a leading and professional manufacturer of prestressed concrete (PC) steel materials, with over 30 years of industry experience.

We are committed to delivering high-quality products and innovative solutions for infrastructure and construction projects worldwide.

Our core products are pc steel strand (Ultra High Tensile Strength PC Strand, Normal Tensile Strength PC Strand), Unbounded PC Strand, Galvanized PC Steel Strand, Weather-Resistant & Anti-Corrosion PC Strand, and PC Steel Wire.