Seamless steel pipes are perforated from whole round steel, and steel pipes without welds on the surface are called seamless steel pipes. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, and top pipes. According to the cross-sectional shape, seamless steel pipes are divided into two types: round and special-shaped. Special-shaped pipes include square, oval, triangular, hexagonal, melon seed, star, and finned pipes. The maximum diameter is 900mm and the minimum diameter is 4mm. According to different purposes, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes. Normally, seamless pipes can withstand 20% higher working pressure than welded pipes of the same material grade and size.

The variable spring hanger can adapt to the load range of 200-210000N, the applicable thermal displacement is 40, 45, 80, 90, 120, 135mm, and the operating temperature range is -40℃～120℃. This hanger is divided into three types according to the installation form: intermediate connecting hanger spring TH1, upper and lower connecting hanger spring TH2, and bracket spring TH3. About the structural form and model representation method of variable spring hanger/variable spring hanger Edit

Putzmeister cutting rings is composed of Q235 and high chromium cast iron.

16Mn have good comprehensive performance, good low temperature performance, good stamping performance, good welding performance.

Putzmeister wear plate is made of Q235 Steel, and adding hard surfacing for higher wear resistant.