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API 5L X42 (L290) steel plates are manufactured in accordance with the American Petroleum Institute (API) standard 5L and are used to manufacture steel plates for oil and gas transmission lines. The "X42" indicates that the minimum yield strength of the steel plate is 42,000 psi (about 290 MPa), while the "L290" is the expression of this yield strength in metric units.

API 5L X42 (L290) steel plate features:

High strength: API 5L X42 (L290) steel plates have high yield strength and tensile strength, and can withstand high internal pressures and external loads.

Good weldability: The steel plate has good weldability, convenient for pipeline connection and maintenance.

Excellent corrosion resistance: by controlling the chemical composition and using the appropriate production process, API 5L X42 (L290) steel plate has certain corrosion resistance and can resist the erosion of oil, gas, water and other media.

Good toughness: the steel plate can still maintain good toughness at low temperatures, and is suitable for pipeline construction in cold areas.

The chemical composition of API 5L X42 (L290) steel plate usually includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr), molybdenum (Mo), vanadium (V) and other elements. Among them, the carbon content is low to ensure good weldability and toughness; At the same time, a certain amount of alloying elements are added to improve the strength and corrosion resistance of the steel. The specific chemical composition requirements are determined according to the API 5L standard.

Mechanical properties of API 5L X42 (L290) steel plate:

Yield strength: API 5L X42 (L290) steel sheet has a minimum yield strength of 42,000 psi (approximately 290 MPa).

Tensile strength: The tensile strength of the steel plate is usually between 50,000 and 70,000 psi (about 345 to 483 MPa).

Elongation: API 5L X42 (L290) steel plate has good plasticity, elongation is usually more than 20%.

Hardness: The hardness of the steel plate is moderate, easy to process and install.

API 5L X42 (L290) steel plates are primarily used in the manufacture of oil and gas transmission pipelines, both onshore and subsea. In addition, it can be used to manufacture other pipes and containers that need to withstand high pressure and corrosive environments. Due to its excellent mechanical properties and corrosion resistance, API 5L X42 (L290) steel plates are widely used in the oil and gas industry.

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