Title:
METHOD FOR DECIDING QUANTITY OF POWDER IN ELONGATING STEEL TUBE
Document Type and Number:
Japanese Patent JP2001205310
Kind Code:
A
Abstract:
To provide a method for deciding the quantity of reducing powder in elongating a steel tube by which scale loss is reduced and the efficiency of descaling is improved.
When a hollow tube stock after piercing is elongated, the quantity of the reducing powder which is supplied onto the inside surface of the hollow tube stock is decided based on the elongation ratio of elongating. It is preferable to decide the quantity of the reducing powder so as to satisfy the undermentioned equation (1). Va≥5×EL+10... equation (1). Where, Va is the quantity of the reducing powder per unit area of the inside surface of the hollow tube stock (g/m2), and EL is the elongation ratio (unit: dimensionless number).
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Inventors:
IIDA SUMIO
TSUBOUCHI KENJI
ANRAKU TOSHIRO
HIDAKA YASUYOSHI
TSUBOUCHI KENJI
ANRAKU TOSHIRO
HIDAKA YASUYOSHI
Application Number:
JP2000017530A
Publication Date:
July 31, 2001
Filing Date:
January 26, 2000
Export Citation:
Assignee:
SUMITOMO METAL IND
International Classes:
B21B25/04; B21B17/02; B21B45/00; (IPC1-7): B21B25/04; B21B17/02; B21B45/00
Attorney, Agent or Firm:
Hirose Shoichi
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