Method for manufacturing seamless steel pipe made of high...

Details Method for manufacturing seamless steel pipe made of high... Method for manufacturing seamless steel pipe made of high...

2011-01-11

2011-01-11

Tolan, Edward (Department: 3725)

Metal deforming

Process

With temperature maintenance or modification

C072S069000, C072S097000, C072S365200, C072S700000

Reexamination Certificate

active

07866199

ABSTRACT:
a billet made of high Cr-high Ni alloy, which contains, by mass percent, 20 to 30% of Cr, 30 to 50% of Ni, and at least one element selected from Mo and W with a value “Mo+0.5W” of 1.5% or more is heated under conditions satisfying the following formula (1), and then the billet is pierced and rolled using an inclined roll type piercing mill with a roll gouge circumferential speed of 2.28 m/sec or higher. This prevents melted rash on the inner surface and lengthens the plug life.in-line-formulae description="In-line Formulae" end="lead"?T≦1575−4.45×Vf−104.7×{−ln(th/ro)}  (1)in-line-formulae description="In-line Formulae" end="tail"?wherein T indicates a heating temperature (° C.) of the billet, Vfindicates the roll gouge circumferential speed (m/sec), roindicates a radius (mm) of a billet at an entry-side, and thindicates a radial thickness (mm) of a pipe after piercing.

REFERENCES:
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