Innovation and Application of Key Techniques for Mini-flow Production of Martensitic Stainless Steel Oil Well Pipe
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Abstract
The conventional manufacturing process for martensitic stainless steel pipe involves forging the cast ingot, and then turning the forged ingot into pipe via hot-piercing. Such process has disadvantages as easily causing defective fold,low qualification rate,long flow process and high cost,etc. Described here in the essay is a new mini-flow process for the martensitic stainless steel oil well pipe,i.e.,CC billet + hot-extrusion. And serial trail manufacture and inspections of the said pipe are made. Relevant practice demonstrates that the said martensitic stainless steel pipe has good surface quality and its as-cast structure is adequately crushed;and after being quenched and tempered,the pipe possesses such advantages as homogeneous microstructure,fine grain,and mechanical properties like strength,elongation,hardness and impact energy which are all up to applicable requirements a specified under Standards API Spec 5CT—2018 and ISO 13680: 2020.
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