Joint Venture was Approved
11/01/1971

ISTW was approved as a joint-venture company between Indonesia and Japan. This was a monumental event where all ISTW great achievements started from.
First Commercial Production Started
17/01/1972

ISTW started its commercial production with one pipe producing mill and one hot dip galvanizing line
One more pipe Production Mill was added
07/03/1977

ISTW added one more pipe production mill in Semarang. This was added in order to keep up with our customers requests or demands
Coil Slitting Line was introduced
04/01/1982

To keep up with ISTW production growth, the coil slitting line was introduced for the first time
Jakarta’s Factory was Added
15/01/1990

ISTW spread its wings by building a new factory in Jakarta equipped with the most advanced pipe-producing mill ( Jakarta no. 1 Mill ) and One coil slitting line
One Pipe Producing Mill Added
13/01/1992

With the growth of demands, ISTW added one more pipe-producing mill (Jakarta no.2 mill ). This event showed its effectiveness in fulfilling all orders in time.
No.3 and No.4 Mill were added
08/01/1996

ISTW added no.3 and no.4 mill. These facilities are also equipped with additional high speed press cutting machine and other various types of tubes re-cutting machines to meet our customers’ needs.
New Jakarta’s factory was built
13/01/1997

To meet the increasing need of re-cutting steel tubes, ISTW built a new factory which specializes in steel tube re-cutting operation in Jakarta.
ISTW no. 5 mill was added
13/01/2003

ISTW added no. 5 mill which specializes in automobiles and motorcycles in Jakarta
6 inch pipe producing mill was introduced
05/02/2007

ISTW Semarang introduced 6 inch pipe-producing mill which supports government and private projects.
2 more mill were added in 2010 and 2011
11/01/2010

As the demands of automotive tubes kept on increasing , ISTW added two more mills no.6 and 7 during those years. One mill specializes in small diameter tubing.
Heat Treatment Machine was Introduced
09/01/2012

ISTW started producing very critical safety parts by investing no. 1 heat treatment machine.
No. 8 Mill in Cikarang operated
07/01/2013

In anticipating the growing demand, ISTW set up a new factory in Cikarang along with mill no. 8
2014-2016 invested in 2 heat treatment machines
04/01/2016

ISTW was very successful in supplying very critical safety parts . ISTW also invested 2 heat treatment machines during those years.