Pipeline steel plates are typically alloyed steels. They mainly consist of iron as the base metal, with carefully controlled additions of other elements. Carbon is an important component, usually present in a relatively low percentage (around {{0}}.05% - 0.25%) to provide strength without sacrificing too much ductility. Manganese is often added in amounts ranging from 1.0% - 2.0% to improve strength and toughness. Other elements like niobium (Nb), vanadium (V), and titanium (Ti) may also be included. These micro - alloying elements play a significant role in refining the microstructure of the steel, enhancing its strength, and improving its resistance to cracking.
| GB/T 21237 | L245 | 6-40 | CR/TMCP/TMCP+T |
| L260 | 8-40 | CR/TMCP/TMCP+T | |
| L360 | 8-40 | CR/TMCP/TMCP+T | |
| L390 | 8-40 | CR/TMCP/TMCP+T | |
| L415 | 8-40 | CR/TMCP/TMCP+T | |
| L450 | 8-40 | CR/TMCP/TMCP+T | |
| L485 | 8-40 | CR/TMCP/TMCP+T | |
| L555 | 8-30 | CR/TMCP/TMCP+T |
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