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What is the difference between API 5L X42 PSL1 steel pipe and API 5L X42 PSL2 line pipe

The American petroleum institute API specifies different specifications for the pipeline steel. The two pipe specifications under API 5L X42 are API 5L X42 PSL1 steel pipe and API 5L X42 PSL2 line pipe.

The API 5L X42 PSL1 steel pipe and API 5L X42 PSL2 line pipe specifications cover seamless steel and welded steel pipes. They are usually used in the hydrocarbon oil and gas industries to transport natural gas, water and oil.

PSL is defined as the product specification level in API 5L. API 5L X42 PSL1 steel pipe is a loose standard quality of pipeline steel, and API 5L X42 PSL2 line pipe contain additional test requirements, more stringent physical, chemical and upper limit of different mechanical properties, charpy impact test conditions and requirements.

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