Method for manufacturing surface treated steel material...

Details Method for manufacturing surface treated steel material... Method for manufacturing surface treated steel material...

2011-04-05

2011-04-05

King, Roy (Department: 1733)

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C148S253000, C106S014050, C106S014110, C106S014120, C106S014140

Reexamination Certificate

active

07918945

ABSTRACT:
A method of manufacturing a surface treated oil well pipe comprising performing chemical conversion treatment on an oil well pipe having a steel composition containing 0.5-13% Cr using a chemical conversion treatment liquid containing zinc and phosphoric acid or manganese and phosphoric acid and further containing potassium tetraborate to form a chemical conversion film of a zinc-phosphate type or a manganese phosphate type, wherein the chemical conversion treatment is carried out in the absence of fluoride ions.

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