API 5L X70 steel can be regarded as large diameter pipes. API 5L X70 steel with the demands in mechanical properties of the pipes followed the API specification for API 5L X70 steel (YS is 485MPa, TS is from 600-750 MPa). API 5L X70 steel is well known that a low carbon bainitic microstructure offers an excellent combination of strength and toughness.
API 5L X70 steel Chemical composition(%): Si:<=0.55 C:0.04-0.16 Mn:1.1-1.7 S:<=0.035 P:<=0.0.35
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