The spiral submerged arc welded pipe is made of hot-rolled steel strip through constant temperature spiral forming and automatic submerged arc welding. The manufacturing process is to roll the steel strip, make the rolling direction at a certain angle to the center direction of the tube, and then form and weld, so the weld is spiral.

ASTM A106 grade seamless steel pipe is a widely used low carbon steel and is widely used in the petroleum, chemical and boiler industries. The material has good mechanical properties.

Carbon steel square tube is a type of steel pipe with a square cross-section, mainly composed of elements such as carbon, manganese, silicon, phosphorus, sulfur, etc. Carbon steel square pipes are widely used in fields such as building structures, mechanical manufacturing, highway facilities, bridges and pipelines.

Carbon steel 20# is ideal for projects requiring reliable performance at a competitive price, particularly in non-corrosive environments. For harsh conditions, surface treatments (e.g., galvanizing) or alloy steels are recommended.

DIN 1629 seamless steel pipe has three main grades of St37.0, St44.0, St52.0. Generally, the DIN 1629 standard is not limited to the working pressure value, and the working temperature is limited to below 300 ℃.

A53 American standard seamless steel pipe is made of high-quality steel billets through hot rolling, cold drawing and other processes. The chemical composition and mechanical properties of this steel pipe comply with the requirements of American standard ASTM A53/A53M.