Hot-Dip Galvanized Round Pipe

Hot-Dip Galvanized Round Pipe — Product Introduction

Hot-dip galvanized round pipe/tube is produced by taking ordinary carbon steel round pipes (straight seam welded pipes or seamless pipes), subjecting them to pickling, water washing, dipping in a flux solution, and drying, and then immersing them in a molten zinc bath at approximately 450°C. This allows a uniform and dense zinc-iron alloy layer and pure zinc layer to adhere to the surface (including the inner and outer walls). The base material of the product is usually Q235B, Q355B, etc., and the zinc layer thickness is typically 60-85μm (or even higher). It possesses extremely excellent anti-corrosion and anti-rust performance, making it one of the most fundamental and widely used steel materials in construction, water supply and drainage, fire protection, and structural support engineering.

I. Product Features

• Internal and external double anti-corrosion: The hot-dip galvanizing process ensures that a complete galvanized layer is formed on both the inner and outer walls of the round pipe simultaneously, with no blind spots. Its anti-corrosion performance far exceeds general painting or electro-galvanizing processes.

• Dense and firm zinc layer: The zinc layer undergoes a metallurgical bond with the steel pipe substrate, resulting in extremely strong adhesion. It is not easy to peel off during transportation, cutting, or bending processing.

• Excellent mechanical properties: The base pipe has good compressive strength, toughness, and good welding performance. It can be subjected to secondary processing such as bending, threading, and socketing.

• Complete specifications and dimensions: The outer diameter ranges from a few millimeters (such as DN15 1/2-inch pipe) to several hundred millimeters (such as DN300), and the wall thickness covers from 1.0mm to over ten millimeters. It has good roundness and uniform wall thickness.

II. Product Advantages

• Ultra-long service life: In outdoor, humid, or general industrial atmospheric environments, the service life of hot-dip galvanized round pipes can reach 20-50 years, requiring almost no maintenance, which significantly reduces later anti-corrosion maintenance costs.

• Efficient and convenient construction: The surface of the galvanized pipe is clean, allowing for direct thread processing (threading), welding, or grooved connections, resulting in extremely fast on-site construction.

• Extremely high cost-effectiveness: Compared with stainless steel pipes or copper pipes, hot-dip galvanized round pipes have much lower material costs while ensuring equivalent anti-corrosion capabilities, delivering excellent economic benefits.

• Environmentally friendly and recyclable material: Both the steel pipe and the zinc layer can be 100% recycled and reused, meeting green and environmentally friendly building material standards.

III. Scope of Application

• Fire protection and water supply/drainage systems: (Core application) Widely used in building fire protection pipelines (sprinkler systems, fire hydrant systems), municipal water supply, and gas transmission (in some regions).

• Building structural support: Used for steel structure factory buildings, space frames, scaffolding, building formwork supports, bridge guardrails, anti-collision columns, etc.

• Municipal and infrastructure engineering: Highway guardrails, street light poles, monitoring poles, electrical conduit (strong and weak current protection sleeves).

• Agriculture and greenhouses: Used as load-bearing frames for vegetable greenhouses and breeding sheds, resistant to moisture and chemical fertilizer corrosion.

• Machinery and conveying equipment: Used to manufacture conveyor rollers, mechanical structural parts, container underframes, etc.