Black Annealed Steel Pipe is a steel pipe that has been black annealed. Annealing is a heat treatment process that heats the steel to an appropriate temperature and then slowly cools it to room temperature under controlled conditions. The black annealed steel pipe forms a black iron oxide surface during the annealing process, which gives it a certain corrosion resistance and a black appearance.
Material of Black Annealed Steel Pipe
1. Low Carbon Steel: Low carbon steel is one of the most common materials for black annealed square pipes. It has a low carbon content, usually in the range of 0.05% to 0.25%. Low carbon steel has good machinability and welding properties and is suitable for general structures and applications.
2. Carbon Structural Steel: Carbon structural steel is also commonly used in the manufacture of black annealed square pipes. The carbon content in carbon structural steel is higher, ranging from 0.30% to 0.70%, which can provide higher strength and durability.
3. Q195 Steel: Q195 Steel is a commonly used carbon structural steel material in China and is often used to manufacture black annealed square tubes. It has good machinability and toughness, and has certain strength and corrosion resistance.
4. Q235 Steel: Q235 Steel is also one of the commonly used carbon structural steel materials in China and is widely used to manufacture black annealed square tubes. Q235 Steel has high strength and good machinability and is a commonly used structural steel material.
Specifications and sizes of black annealed steel pipes
The specifications and sizes of black annealed steel pipes can vary according to different standards and requirements. The following are some common specifications and size ranges of black annealed steel pipes for reference:
1. Side Length: The side length of black annealed square tubes can range from small to large, and the common range includes but is not limited to: · Small size: side length is 10mm, 12mm, 15mm, 20mm, etc.
· Medium size: side length is 25mm, 30mm, 40mm, 50mm, etc.
·Large size: side length is 60mm, 70mm, 80mm, 100mm, etc.
·Larger size: side length is 150mm, 200mm, 250mm, 300mm, etc.
2. Outer Diameter: The outer diameter of the black annealed steel pipe can be from small to large, and the common range includes but is not limited to: ·Small outer diameter: Common small outer diameters include 6mm, 8mm, 10mm, etc.
·Medium outer diameter: Common medium outer diameters include 12mm, 15mm, 20mm, etc.
·Large outer diameter: Common large outer diameters include 25mm, 32mm, 40mm, etc.
·Larger outer diameter: Common larger outer diameters include 50mm, 60mm, 80mm, etc.
3. Wall Thickness: There are also many options for the wall thickness of the black annealed square tube, and the common range includes but is not limited to:
·Small wall thickness: 0.5mm, 0.8mm, 1.0mm, etc.
·Medium wall thickness: 1.2mm, 1.5mm, 2.0mm, etc.
·Large wall thickness: 2.5mm, 3.0mm, 4.0mm, etc.
