EXEO-M21

Ultra tough steel

EXEO-M21
Nachi developed the EXEO series alloys in company-wide combined and connected engineeringsystem by first analyzing and determining necessary characteristics and then applying Nachi original
design and special melting technologies.
EXEO-M21 shows superior strength and toughness even with notchs because of few impurity
inclusions.
L Ageing and nitriding are in the same temperature range so they can be done at the same time.
L It has superior workability at hot and cold temperature, good machinability and excellent weldability.
L High strength (2000 MPa) and toughness are achieved by an approximately 500°C aging process.

Mechanical properties
Steels being compared

Hardness

Yield strength Tensile strengthElongation

strength Strength ratio
Reduction of area Tensile
with notch(%)
with notch
(MPa)

(HRC)

(MPa)

(MPa)

(%)

EXEO-M2155

2000

2100

11502900

1.4

SCM43532790

95018451030

1.1

SUS420J2

52

1500

1800

635

1900

1.1

[Heat treatment conditions: Solution treatment 820°C × 1h, ageing 490°C × 5h]

Applications
LAutomotive parts (CVT belts etc.)
LRacing car parts
LAircraft and satellite partsLPrecision molds for plastics
LEjector pins
LZinc die cast molds, core pins
LWelding rods for repairing mold
LPunch for cold forging
LMachine parts require highstrength etc.

Nozzles of plastic injection molding machine

Parts for a formula car

EXEO-M21

Ultra tough steel

Heat treatment conditions
Aging process

Solution treatment process
Recommended conditions

Hardness

Recommended conditions

Hardness(Nitriding hardness)

820°C × 1h cooling

32HRC

490°C × 3 - 5h cooling

55HRC

860 HV

EXEO-M21

Aging process time and hardness

5858

565654

54

Hardness (HRC)

Hardness (HRC)

Solution treatment temperature and aging hardness

52
Aging time: 5 h50

Solution treatment 780°C820°C860°C

485250
Solution treatment: 820°C x 1 h48

46464444424240

420

450

480

510

540

Aging 1 h3h5h
12 h

40

420

Aging temperature (°C)

450480510

540

Aging temperature (°C)

Production range
L Available either finished or semi-finished.
L Contact us for production specifications, delivery times, and minimum orders.
ShapeRange of dimensions (mm)Forged round bar

F40 - 200

Rolled round bar

F13 - 100

Forged flat bar

Contact us for details (30 - 200)

Rolled flat bar

Contact us for details ( t 3 – 48)

Polishing wire

F2 - 13×2000L
F1.3 - 12

Drawn coil

Unauthorized reproduction of these materials is prohibited.
L Information in this catalog may be changed without prior notice due to technical advancements or product developments. While care has beentaken to produce these materials, NACHI Fujikoshi accepts no responsibility for damages caused by misprints or omissions that may occur during
the publication of this catalog.
L Please note that the characteristics and values provided here are typical examples which may differ from the characteristics of the actual product.

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Shiodome Sumitomo Bldg. 17F 1-9-2 Higashi-shinbashi, Minato-ku, Tokyo 105-0021, JAPAN
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Tel: +49-(0)2151-65046-0 Fax: +49-(0)2151-65046-90

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