Oil well pipe, also known as special oil pipe, is the basis of the petroleum industry, casing, tubing and drill string components (drill pipe, drill collar, kelly, etc.) collectively referred to as oil well pipe

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Stainless Steel (Stainless Steel) is short for stainless acid-resistant steel, resistant to air, steam, water and other weak corrosion medium or stainless steel

Steel having a hollow section whose length is much greater than its diameter or circumference.