MANUFACTURE OF TWO-PHASE STAINLESS STEEL SEAMLESS TUBE

Title:

MANUFACTURE OF TWO-PHASE STAINLESS STEEL SEAMLESS TUBE

Document Type and Number:

Japanese Patent JPH01228603

Kind Code:

A

Abstract:

PURPOSE: To efficiently produce seamless steel tubes of good inside and outside quality by producing a round billet by casting a two-phase stainless steel of a specific composition and then heating the billet at a specific temp. and rolling the billet by specifying a piercing and a drafting ratios.

CONSTITUTION: A two-phase stainless steel stock containing, by wt., ≤0.08% C, 0.01W2.00% Si, 0.01W3.00% Mn, ≤0.03% P, 0.0015% S, 0.01W2.00% Cu, 20.00W35.00% Cr, 3.00W15.00% Ni, 0.5W8.00% Mo, 0.001W0.20% solAl, 0.0015W0.0070% Ca, 0.03W0.35% N, ≤0.0050% O, and remaining parts of Fe and inevitable impurities is melted and formed into a round billet by a round billet continuous casting machine. The stock is heated to 1200W1310°C and then is rolled by a piercing rolling mill under conditions such as a piercing ratio of ≤1.40 and a drafting ratio of ≤5.0% to produce a seamless steel tube.

Inventors:

YASUI AKIRA
YAMAGUCHI YOJI
TANAKA YOSHIO

Application Number:

JP5676588A

Publication Date:

September 12, 1989

Filing Date:

March 10, 1988

Export Citation:

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Assignee:

SUMITOMO METAL IND

International Classes:

B21B19/04; C21D8/10; C22C38/00; C22C38/44; C22C38/58; (IPC1-7): B21B19/04; C21D8/10; C22C38/00; C22C38/44; C22C38/58

Domestic Patent References:

JPS612743A	1986-01-08
JPS58210155A	1983-12-07

Attorney, Agent or Firm:

Takeshi Imai

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