Headquarters
Ayase Plant

6-10-6 Ayase, Adachi-ku, Tokyo
6-10-6 Ayase, Adachi-ku, Tokyo
TEL : +81-3（3605）2121 (main)
FAX : +81-3（3628）6620 (main)

Ichikawa Plant 1920 Kouya, Ichikawa-shi, Chiba
TEL : +81-47（327）0121 (sales)
TEL : +81-47（327）1571 (manufacturing)
FAX : +81-47（328）4774

Headquarters
Ayase Plant

Ichikawa Plant

Chiyoda-Steel co.,ltdEstablished as a galvanized steel sheet manufacturer in June 1948,
Chiyoda Zinc Industry Co., Ltd., expanded the business to electric
furnace steel making in November 1956 and to light bars in January
1957 and changed the company name to present Chiyoda-Steel Co.,
Ltd., in April 1974.
We have two production sites for steel bars for concrete reinforcement

Chiyoda-Steel achievesworldwide salesof deformed steel bars.

In particular, the reinforcing bar business site meets the strict

The Kanto region in Japan is the largest supply baseof scrap in southeastern Asia.
The products manufactured in the region thateﬀectively utilize the competitive
resources are not only used in Japan but also in awide range of areas.

environmental criteria of the Tokyo metropolitan government and theCompany Overview

and prepainted steel sheets each. The abundant experience andadvanced techniques ensure comparable power to enter the global
competition in both quality and costs.

sole plant in Tokyo provides products in a timely manner.

Corporate name
Chiyoda-Steel Co., Ltd.
President
Masataka Sakata
Number of employees 170

We continue to contribute to the society by playing a role in the steel
industry in Japan and strengthening the foundation of the company.

Ayase Plant
Deformed steel bars for concrete reinforcement
・JIS G3112 SD295A,SD345,SD390/D10,D13,D16/3.5〜12.0m
・ASTM A615 Grade40,Grade60/No.3,No.4,No.5/20,30,40ft
・KS D3504 SD400/D10,D13,D16/8.0m
・CSA G.30.18-09 Grade400W/10M/12.0m

We appreciate your support and patronage.

HistoryHeadquarters Building

Ichikawa Plant<Business items>
Colored galvanized steel sheets (JIS G 3312, 3318, 3322)
Formed and machined items<Production capacity> 5,000 tons per month

June 1948

Established Chiyoda Kogyosho at 791 Horikiri-cho, Katsushika-ku. Started manufacturing and sales of galvanizedsteel sheets.

June 1949

Formed a joint-stock company with capital of 400,000 yen. Changed the name to Chiyoda Zinc Industry Co., Ltd.
Placed the headquarters at 1-4 Nihonbashi Edobashi, Chuo-ku.

October 1949

Moved the plant to the new location of the present headquarters in association with expanding demand forgalvanized steel sheets. Monthly production of 1,500 tons.

January 1960

Added a 20-ton electric furnace plant. Monthly production of normal steel ingots of 4,500 tons for increased salesof steel ingots to the market.

August 1966

Approved plant for JIS marking of hot rolled steel bars types 1 and 2 and hot rolled deformed steel bars types 1
to 3 of steel bars for concrete reinforcement (JIS G 3112).

January 1971

Added a 40-ton electric furnace. Monthly production of normal steel ingots of 10,000 tons to intend increased
sales of steel bars.

April 1974

Changed the company name to Chiyoda-Steel Co., Ltd., in association with the expansion of operations.

April 1975

Approved plant for JIS marking of hot rolled deformed steel bars type 4 for concrete reinforcement (JIS G 3112).

January 1990

Installed a ﬂicker compensation system (15,000 kVA).

January 1990

Modiﬁed the heating furnace to the side-pusher type. Replaced the ﬁnishing line.

April 1992

Received the Director-General Prize of the Bureau of Economy, Trade and Industry as an excellent plant forenergy management from the director-general of the Kanto Bureau of Economy, Trade and Industry.

November 1992

Received the Director-General Prize of the Kanto Bureau of Economy, Trade and Industry as an excellent plant forindustrial standardization.

October 1996

Received the 3Rs Promotion Council Chairʼs Prize as acknowledgement for contributions to recycling promotion.

September 2002

Installed a building dust collector (6,000 Nm3).

February 2004

Shifted the heavy oil combustion equipment in the rolling mill to gas.

January 2006

Shifted the heavy oil combustion equipment in the steel mill to gas.

January 2007

Newly built the headquarters oﬃce.

February 2007

Obtained ISO 9001 certiﬁcation from JIC Quality Assurance Ltd.

January 2008

Updated the ﬁnishing equipment of rolled materials.

May 2008
June 2008

Added a dust collector for both furnace emissions and building equipment (7,000 m3/min).
Obtained certiﬁcation for the new JIS Marking system from JIC Quality Assurance Ltd.

January 2009Updated the ﬂoor cooling system.

March 2009

Obtained certiﬁcation under the KS standards.

December 2009

Registration of ISO 14001 by JIC Quality Assurance Ltd.

The consistent control system from raw materials
to production responds to your trust.

Demolition

Construction
Raw Material Scrap

Shipping

Electric Furnace

Bundle Steel Bars up

Continuous Cast

Tensile Test
Billets

Cooling bed

Continuous heating furnace

Finishing Roll

Steel bars for concrete reinforcement are made from steel
scrap and ancillary materials and produced by smelting andreﬁning in an electric furnace, ingot making by a continuous casting machine, and hot rolling with the use of aheating furnace and rolling equipment.

Intermediate Roll

Rough RollCK Brand, the pride of skillful Chiyoda. Deformed steel bars active in many ﬁelds.
Deformed bars - Product features

Tables of shape and mass

CK Brand to support social infrastructure

Marking approval by Japanese Industrial Standards

Chiyoda-Steel is proud of its CK Brand that has been a key partin the support of the essential social infrastructure for more
fulﬁlled lives of people, including medium to high rises,
residential buildings, and road improvement. Deformed steel
bars play an important role as the fundamental material in civilengineering and construction projects in a wide range of ﬁelds.

NameCategory

Steel bars for concrete
reinforcement(JIS G 3112)

Deformedsteel bar

Denotation ofthe type

CK Brand to support social infrastructure
Metal tag

SD 295WhiteSD 345

YellowSD 390

GreenSD 490

Blue

Chiyoda-Steel is proud of its CK Brand that has been a key part in the support of the essential social infrastructure for more fulﬁlled
lives of people, including medium to high rises, residential buildings, and road improvement. Deformed steel bars play an importantrole as the fundamental material in civil engineering and construction projects in a wide range of ﬁelds.
Chemical composition
NameCategory

Steel bars
for concrete
reinforcement(JIS G 3112)

Deformed steelbar

Chemical composition %Denotation ofthe typeCSi

MnPS

SD 2950.27 and less0.55 and less

1.50 and less0.050 and less0.050 and less─

SD 3450.27 and less0.55 and less

1.60 and less0.040 and less0.040 and less

0.60 and lessSD 3900.29 and less0.55 and less

1.80 and less0.040 and less0.040 and less

0.65 and less

SD 4900.32 and less0.55 and less

1.80 and less0.040 and less0.040 and less

0.70 and less

Unit masskg/m

Maximum of
averaged rib
interval mm

Minimummmceq

Dimension, mass, and rib tolerance for deformed steel bars
Designation

Nominaldiameter (d)mmNominalperimeter (l)mmNominal crosssectional area (S)mm2

Rib height
Maximummm

Maximum of sumof rib gaps
mm

Roll mark on a deformed steel bar

D10

9.53

29.9

71.33

0.560

6.7

0.4

0.87.5

CK 13

D13

12.7

39.9

126.7

0.995

8.9

0.5

1.0

10.0

D16

15.9

50.0

198.6

1.56

11.1

0.7

1.4

12.5

Mechanical properties

CK 13︲Name

Category

CK 13•

Steel bars
for concrete
reinforcement(JIS G 3112)

CK 13••

Deformedsteel bar

Tensile test
Denotation of Yield point or 0.2
Tensile strength yield ratio
the type% proof stress
N/mm2（％）
N/mm2
SD 295295 and more

440 to 600

SD 345345 to 440

490 and more

SD 390390 to 510

560 and more

SD 490490 to 625

620 and more

CK 13•••

Bend testSpecimen

Elongation %According to
16 and more 180°
No. 2
According to
80 and less18 and more 180°
No. 2
According to
80 and less
16 and more 180°
No. 2According to
80 and less
12 and more 90°
No. 2
─

GRADE 40GRADE 60

GRADE 40
CSiMn

PS

Yield Point

Tensile Strength

─

─

─

0.060％ Max.

─

40000psi Min.

60000psi Min.
ISO 9001 Certiﬁcate of registration

GRADE 60
CSiMnPS

Yield Point

Tensile Strength───

0.060％ Max.

─60000psi Min.

90000psi Min.

ISO 14001 Certiﬁcate of registration

BendangleJIS Certiﬁcate

Inside radius
1.5 times
nominal diameter
1.5 times
nominal diameter
2.5 times
nominal diameter
2.0 times
nominal diameter