Q235B spiral steel pipe is currently a widely used spiral steel pipe in the market. Carbon steel materials Q235A to D are divided into four grades, with D grade being higher. Different material grades are used in different engineering situations. Carbon steel Q235B and No. 20 steel are relatively similar, both of which belong to the carbon steel grade and are widely used. Q235B spiral steel pipe is generally used in low-pressure fluid transportation pipelines, and for harsh environments, L-grade pipeline steel is often used.