EXEO-S10

Low Thermal Expansion Alloy

EXEO-S10NACHI developed the EXEO series alloys in company-wide combined and connected engineeringsystem by first analyzing and determining necessary characteristics and then applying Nachi original
alloy design and special melting technologies.
EXEO-S10 has superior low thermal expansion characteristics, it is clean with few impurities, and thebest suitable for precision parts.
L Alloy composition is accurately controlled by using special melting technology.
L Nachi original technologies make it with very low level impurities and non-metallic inclusions.
L It is used as parts of ultra-precision machinery, optical equipment, semiconductor manufacturing machine andelectronic devices.

Properties
Expansion characteristics
60

Thermal expansion curve

Amount of expansion (Mm)

Sample length 15 mm
5040

SUS420J2
30
2010

EXEO-S100−100100200300

Temperature (°C)

Physical properties
Item
Annealed materialHardness(HRB)

Proof stress(MPa)Tensile strength(MPa)Elongation(%)

Reduction of area(%)

Density(g/cm3)

Coefﬁcient ofthermal expansion((30-100°C)/°C)

71310

440

45878.15≦1×10-6ApplicationsL Spindles for ultra-precision machinery

L Parts for satellites

L Parts for laser beam machine

L Parts for magnetic chuck

L Parts for precision measuring equipment

L Material for glass sealing

L Parts for optical communications equipment

L Parts for electromagnetic filters

L Parts for electromagnetic relays

L Various supports and parts

EXEO-S10

Low Thermal Expansion Alloy

Production range
Shape

Range of dimensions (mm)Forged round bar

F40 – 200 × L1000 - 3000

Rolled round bar

F13 – 100 × L2000 - 5000

Forged flat bar

Contact us for details (30 - 200)

Rolled flat bar

Contact us for details ( t 3 – 40)

Hot drawn steel platet 4 - 18, w 400 - 600, L 1000 - 2000

Cold drawn steel platet 0.5 - 12, w 500 - 600, L 1000 - 2000

L Available either finished or semi-finished.
L Contact us for production specifications, delivery times, andminimum orders.

Air-spindle for ultra-precision machinery

About low thermal expansion material
L When the percentage of nickel in iron-nickel alloys reaches

Table 1. Coefficient of thermal expansion for various materials

36%, the alloy undergoes magnetic transformation and theName of materialCoefficient of thermal expansion (x 10-6/K)

expansion coefficient becomes extremely small, about 1/10 ofMagnesium Mg

26.0

normal metals. This phenomenon is called the Invar property.

Aluminum Al

23.5

Copper Cu

17.0

Gold

14.1

Nickel Ni

13.3

Iron Fe

12.1

Platinum Pt

9.0

Molybdenum Mo

5.1

Tungsten W

4.5

Brass

17.5

Stainless steel 304

17.3

Stainless steel 420

10.9

Coefficient of thermal expansion (x 10-6/K)

Figure 1. Relation between amount of Ni in Fe-Ni alloy and thermal expansion coefficient
16128402030405060708090

100

Amount of Ni (wt%)(Source: ASM METAL HANDBOOK)

L Cobalt has been added to these alloys for an Fe-Ni-Co

High-speed steel M2

8.6Invar≦2.0

Super Invar≦1.0

Diamond

1.1

Pyrex glass

3.2

Magnesium oxide MgO

9.7

ternary alloy. It is called Super Invar alloy because it hasConcrete

7 ~ 14a thermal expansion coefficient that is smaller than Invar.

Celluloid

90 ~ 160

Bakelite21 ~ 33(Source: Alloy Data Book, Chronological Scientific Tables, and the jornals JSPE, etc.)

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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