"X46" is a material grade designation derived from standards established by the American Petroleum Institute (API). In this naming system, "X" represents line pipe, and "46" indicates the minimum yield strength required for this grade of steel pipe, expressed in thousands of pounds per square inch (ksi). X46 large-diameter pipe refers to line pipe with a minimum yield strength of 46,000 pounds per square inch (approximately 317 MPa). Yield strength is the stress value at which a material begins to undergo significant plastic deformation and is one of the key mechanical indicators for measuring the pressure-bearing capacity of a line pipe. This grade belongs to the medium strength level in API standards, balancing strength, toughness, and weldability.
API 5L X46 SSAW pipe Chemical Composition
Carbon (C): The carbon content of X46 large diameter pipe is typically between 0.42% and 0.5%.
Manganese (Mn): The content is typically between 1.35% and 1.65%.
Silicon (Si): The content is typically less than 0.6%.
Sulfur (S) and Phosphorus (P): These elements may exist as impurities, but their content must be strictly controlled. Typically, the sulfur content is less than 0.045%, and the phosphorus content is less than 0.045%.
API 5L X46 Large diameter saw pipe Mechanical Properties
Yield Strength: The minimum yield strength of X46 line pipe is 380 MPa (or 55,000 psi).
Tensile Strength: Its tensile strength is typically between 450 and 615 MPa (or 65,000 to 90,000 psi).
Elongation: The elongation of A53/A106 is not less than 24%, and the elongation of API 5L is not less than 20%.
X46 large-diameter welded pipes are mainly used in the following fields:
Long-distance transportation of oil and natural gas;
transportation of water, steam, and chemical media;
and support and connection in various industrial structures.
API 5L X46 large-diameter welded pipes factory
