Q235B and L245 are the two materials that are encountered in the spiral steel pipe. The Q235B spiral steel pipe is the most common in the market at present, and the common specifications are available in stock, but L245 is a material in the pipeline steel.

L245 is a low-pressure fluid coiled pipe, its performance is similar to 20# seamless pipe,
Mechanical properties and chemical composition of L245
Mechanical properties: Yield strength: 245 MPa
Tensile strength: 415 MPa
Chemical composition: C: 0.26 Mn: 1.15 S: not more than 0.030 P: not more than 0.030
If the logo is L245NB, the N in it means that the steel of L245 has been deformed and normalized. B means B grade steel pipe.
Therefore, L245NB means that it has been deformed and normalized on the basis of L245.

Q235B element content
Carbon C: ≤0.20%
Silicon Si: ≤0.35%
Manganese Mn: ≤1.4%
Sulfur S: ≤0.045%
Phosphorus P: ≤0.045%
Chromium Cr: allowable residual content ≤ 0.30%
Nickel Ni: allowable residual content ≤ 0.30%
Copper Cu: allowable residual content ≤ 0.30 %
Note: Deoxidation method: F, b, Z