Seamless steel pipes with small outer diameters are called small-diameter seamless steel pipes. Small-diameter seamless steel pipes can be further divided into: seamless small-diameter steel pipes and straight-seam (also known as welded) small-diameter seamless steel pipes.

Boiler tubes are mainly used to manufacture superheaters, reheaters, water walls, economizers, etc., for supercritical or ultra-supercritical boilers.

H-beams are made from a variety of materials, commonly including carbon structural steel such as Q235 and Q345, as well as alloy steel with higher strength and performance. Their specifications are mainly represented by a set of numbers, such as H200x200x8x12, representing different sizes of H-beams, specifically indicating the model (e.g., H-beam), height (H), and other parameters.

Black steel pipe Sch 40 is one of the most widely used types of carbon steel pipe in construction, plumbing, and industrial systems. Its Schedule 40 designation represents a balanced wall thickness that supports moderate pressure while maintaining an affordable cost.

Choosing the right black steel pipe is very important for both safety and efficiency. Many professionals use clear dimension charts to pick the right size easily. When you understand the diameter, wall thickness, and weight, you can avoid fitting problems in construction or industrial work.

Seamless alloy pipes refer to materials containing a certain amount of alloying elements. There are many types of alloy steel, usually classified according to the content of alloying elements: low-alloy steel (content <5%), medium-alloy steel (content 5%–10%), and high-alloy steel (content >10%)