Comprehensive Guide to 49mm Steel Pipes

November 24, 2025
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What Is a 49mm Steel Pipe?

A 49mm steel pipe is a circular steel tube with an outer diameter of 49 mm, classified as a medium-large pipe size widely used in structural construction, mechanical fabrication, and industrial pipeline systems. Known for its robust strength, excellent stability, and high tolerance to impact and load, the 49mm steel pipe is preferred in applications requiring greater rigidity than smaller-diameter pipes.

This pipe size is manufactured in several forms—including black steel, galvanized steel, and seamless steel—allowing it to adapt to diverse working environments, from indoor structural frameworks to heavy-duty industrial systems subjected to pressure, weather, or corrosion.

Key Technical Characteristics

1. Dimensions

  • Outer diameter: 49 mm (some standards record 48.6 mm depending on production methods)
  • Nominal size: Commonly classified as DN40 in engineering specifications
  • Wall thickness options: Typically ranges from 1.2 mm to 7.0 mm
    • Thin wall (1.2–2.0 mm): non-loadbearing structures, decorative items
    • Medium wall (2.5–4.0 mm): mechanical fabrication, general construction frameworks
    • Thick wall (4.5–7.0 mm): pipelines under pressure, industrial systems, and heavy-duty use

2. Types of 49mm Steel Pipes

• Black Steel Pipes (Non-Galvanized Hot-Rolled Steel)

  • Made from hot-rolled steel with a natural dark finish
  • Advantages:
    • Excellent structural rigidity
    • Competitive price
    • Suitable for welding, cutting, and mechanical processing
  • Applications:
    • Industrial scaffolding systems
    • Structural frameworks for warehouses or large-span buildings
    • Temporary or permanent support structures

• Galvanized Steel Pipes (Corrosion-Resistant Zinc Coating)

  • Protected by a layer of zinc through hot-dip or electro-galvanized methods
  • Advantages:
    • Strong resistance to oxidation and chemical corrosion
    • Longer service life in outdoor and marine environments
  • Applications:
    • Water supply or drainage pipelines
    • Outdoor railings, safety barriers, fencing systems
    • Piping exposed to moisture, rain, or coastal climates

• Seamless Steel Pipes (High Durability – No Weld Seam)

  • Manufactured using extrusion or piercing techniques to ensure a smooth, uniform tube
  • Advantages:
    • Exceptional pressure resistance
    • No risk of leakage due to welding defects
    • Suitable for high-temperature, high-pressure systems
  • Applications:
    • Hydraulic and pneumatic systems
    • Oil and gas transportation
    • Heat exchanger tubing, mechanical cylinders, industrial boilers

Common Applications of 49mm Steel Pipes

1. Structural and Construction Projects

  • Heavy-duty scaffolding systems
  • Frames for industrial plants and steel buildings
  • Bracing systems, columns, support beams

2. Industrial Piping and Mechanical Use

  • Transmission of compressed air, steam, or gas
  • Oil and fuel pipelines
  • Pressure-bearing mechanical components

3. Outdoor and Civil Applications

  • Urban infrastructure (railings, guardrails, lamp posts)
  • Agricultural structures such as greenhouses or trellis systems
  • Frames for billboards, signage, and outdoor installations

Contact Lộc Thiên Steel

Address: No. 1001, Group 22, KP1, Long Hưng Ward, Biên HòaCity, Đồng Nai

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