No.273402020040500S

■ Affiliate companies manufacturing NETUREN Induction Tempered Wire;

Shanghai Neturen Co., Ltd. 651 Beihe Road, Jiading, shanghai, china Tel：+86-21-33517528 Fax：+86-21-33517538

Neturen America Corporation2995 Moser Court, Hamilton, Ohio, USA Tel：+1-513-863-1900 Fax：+1-513-863-1147

Neturen Czech s.r.o.Jizni 1079, Bitozeves-Prumyslova zona Triangle, 438 01 Bitozeves, Czech Republic Tel：+420-415-652-239 Fax：+420-415-240-311

NETURENInduction Tempered WireNETURENInduction Tempered WireNETURENInduction Tempered Wire

Tempered Spring Steel Wire

NETUREN CO.,LTD. 2-17-1, Higashi-gotanda, Shinagawa-ku, Tokyo 141-8639, Japan　Tel : +81-3-3443-5444　Fax : +81-3-5488-7538

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Neturen Co., Ltd. was founded in 1940 and has been engaged in the induction heating business ever since.NETUREN Induction Tempered Wire, which is suitable for cold formed coil spring, is also utilized our own developed induction heating method. Our induct ion tempered wire has been highly evaluated by many customers in the world for its excellent quality.In abroad, NETUREN Induction Tempered Wire has been manufactured at our joint venture company in China and USA with the same production method and quality control as we are applying.

Normally NETUREN Induction Tempered Wire is categorized as Oil Tempered Wire for its mechanical properties, however, our advanced and unique production system uses electric power instead of gas as energy source for heating and water instead of oil for quenching.

Induction heat treatment is, as you can see in Fig. 1, one of heat treatment method assembled, under accurate control, with Induction Heating Process and Rapid Cooling System which can cool wire material uniformly besides rapidly.As a matter of fact, this system not only materializes

excellent properties of material but also enables us to heat material so rapidly up to target temperature in accordance with its application without touching anything.Induction Heat Treatment is quite effective to non-pollution system suitable for the age of saving resources and energy.

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Ako plant in Hyogo, Japan

Fig. 1 Schematic illustration of induction heating

High frequency current

Working coil

Steel

What is NETUREN Induction Tempered Wire?

Principle of Induction Heat Treatment

Introduction

Material

receptionDescaling

ShipmentInspection

DrawingInduction quenchingInduction tempering

Eddycurrentinspection

PackingWinding

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NETUREN Induction Tempered Wire is manufactured and shipped according to the process shown in Fig. 2.Through this process l ike descaling, drawing, quenching and tempering the wire is heat-treated to provide the required mechanical properties and is continuously inspected by eddy current flaw detector.

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Fig. 2 Manufacturing process

Heat treatment process Finished products in coil before packing

Manufacturing Process

From the wire rods to finished products, it is manufactured under perfect quality control by latest facilities and supreme technology, with automatic induction heating system developed by ourselves.NETUREN Induction Tempered Wire by excellent manufacturing system has following features:

１．Because of rapid and short time induction heat treatment for austenitization,

● Fine grain structure can be gained.

● Decarburization and oxidation of grain boundary on surface hardly occurs.

２．Because of interaction of fine quenched structure and short time induction tempering,

● High strength and toughness can be obtained at the same time.

３．By using the precise control system for heating and cooling, and the quenching and the tempering temperature are controlled for each wire one by one,

● Adjustable requested strength according to customer's requirement.

● Uniform strength for entire length of wire can be obtained.

● There is less variation of strength within a series of products manufactured based on the same specification.

４．For forming of coil spring,

● Reducible the deviation for spring dimension.

● Possible to form smaller D/d springs even using higher strength of wire.

● Fatigue and sag resistances remain high level.

● Cost reduction will be possible by weight saving due to high applied stress.

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Fig. 3 Microstructure

Raw material Finished product

Fig. 4 Coiling test results

ITW®12φσβ=1853Nmm2

Features

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■　Chemical compositionWire rod of SAE9254 mainly and other similar grade added special elements are used as raw material.The chemical composition of SAE9254 is as show in Table 1.

■　Diameter rangeDiameter range is 6.0mm to 17mm.Please ask us for smaller diameters than 6.0mm

■　Tolerance and Out of roundnessTolerance and Out of roundness are as shown in Table 2.

■　Mechanical propertiesStandard mechanical properties are as shown in Table 3.

Table 1 Chemical composition (%)

Material

SAE9254

C

0.51－0.59

0.51－0.59

Si

1.20－1.60

1.20－1.60

Mn

0.60－0.80

0.50－0.90

P

0.035 or less

0.035 or less

S

0.040 or less

0.035 or less

Cr

0.60－0.80

0.55－0.90SWOSC-B

（For reference）JIS G 3560-1994

Table 2 Tolerance and Out of roundness (mm)

Diameter

6.0 to 17.0 ±0.05 0.05 or less

Tolerance Out of roundness

Table 3 Mechanical properties

Grade symbol

SWI-180

SWI-190

SWI-200

Tensile strength (N/mm2)

1,750－1,850

1,850－1,950

1,950－2,050

Min. 35

Min. 35

Min. 35

Reduction of area (%)

Other tensile strength range than above standard is applicable.

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1．For handling and storagePay strong attention not to have flaws, scratches, abrasions, scrapes, bruises and other wounds on wire.Pay strong attention to prevent the wire from moisture such as rain, high humidity or chemical materials not to occur the rust or corrosion on wire.Pay strong attention to keep away from the electric or cutting spark.Even such a small surface defects may cause the breakage of spring or rebase the properties of spring.　* Do not use steel wire rope but use nylon sling for lifting.　* It is recommended to put the wire on rubber sheet or squared timber for storage.

2．For use1) Rewinding stand must be used for rewinding of wire in coil. It is recommended to use rewinding stand with

low frictional resistance.2) Be careful with spring back of wire end when cutting the bindings for wire in coil.3) Do not apply plating to the springs processed from the wire.4) Low annealing temperature must be done after formed of coil spring within 24 hours.

suspensions in two- and four-wheel vehicles, emergency brake for large-sized vehicles, shutter,industrial machine and other springs need high fatigue resistance and high sag resistance.(ITW is not available for valve springs.)

Standard specifications

Instructions for safety use

Usage

30min. or more

Holding TimeHeating temperatureGrade symbol(Tensile strength)

400℃±10℃

380℃±10℃

SWI-180 (1750～1850N/mm2)

SWI-200 (1950～2050N/mm2)

Holding Time

Heating time

Heatingtemperature

Relationship between temperature and tensile strength

Relationship between temperature and residual stress

Relationship between holding time of heating and residual stress

■　Recommended conditionsFollowing are the recommended conditions for low temperature annealing to be processed after forming of coil spring using SWI-180 and SWI-200 respectively.

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〈Reference data〉

Heating temperature(℃)350

0

200

400

600

800

1000

as coil 375 400 425 450

Residualstress（N/mm2）

Spring specification　d=11.5mm　D=115.0mmMeasuring point　Inner side, Axial direction of wireUnder constant keeping time in 30min.

Heating temperature(℃)

Residualstress（N/mm2）

3500

200

400

600

800

1200

1000

as coil 375 400 425 450

Spring specification　d=11.5mm　D=115.0mmMeasuring point　Inner side, Axial direction of wireUnder constant keeping timein 30min.

SWI－200SWI－180

1900

1800

1700

1600

1500

1400300as coil 325 350 375

Heating temperature(℃)400 425 450 475 500

Tensilestrength（N/mm2）

Under constantkeeping temp.in 30min.

Tensilestrength（N/mm2）

2100

2000

1900

1800

1700

1600

1500300as coil 325 350 375

Heating temperature(℃)400 425 450 475 500

Under constantkeeping temp.in 30min.

SWI－200SWI－180

Keeping Time(min.)10

0

200

400

600

800

1000

as coil 20 30

30

40 50 60

Residualstress（N/mm2）

Spring specification　d=11.5mm　D=115.0mmMeasuring point　Inner side, Axial direction of wireUnder constant keeping temp. at 400℃

Keeping Time(min.)

Residualstress（N/mm2）

100

200

400

600

800

1000

as coil 20 30 40 50 60

Spring specification　d=11.5mm　D=115.0mmMeasuring point　Inner side, Axial direction of wireUnder constant keeping temp. at 375℃

SWI－200SWI－180

　Conditions of low temperature annealing

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6.06.57.07.58.08.59.09.5

10.0

10.5

11.0

11.5

12.0

12.5

13.0

13.5

14.0

14.5

15.0

15.5

16.0

16.5

17.0

6.06.57.07.58.08.59.09.5

10.0

10.5

11.0

11.5

12.0

12.5

13.0

13.5

14.0

14.5

15.0

15.5

16.0

16.5

17.0

1,710－1,860

（150）

1,660－1,810

（150）

1,610－1,760

（150）

1,950－2,050

（100）

1,750－1,850

（100）

Dia.

(mm)

Dia.

(mm)

Tolerance(mm)

Roundness(mm)

Reduction of area(%)

JIS G 3560

SWOSC－B

±0.060

±0.070

±0.090

JIS G 3560

SWOSC－B

±0.050

0.060 or less

0.070 or less

0.090 or less

JIS G 3560

SWOSC－B

0.050 or less

＞35

＞30

JIS G 3560

SWOSC－B

＞35

NETUREN Induction

Tempered Wire

NETUREN Induction

Tempered Wire

NETUREN Induction

Tempered Wire

SWI- 200

SWI- 180

1,850－1,950

（100）

SWI- 190

* Numerical figures in parentheses show the specified range of tensile strength.

NETUREN Induction Tempered Wire

Tensile strength(N/mm2 )

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WO

SC

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356

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ire

〈R

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No.273402020040500S

■ Affiliate companies manufacturing NETUREN Induction Tempered Wire;

Shanghai Neturen Co., Ltd. 651 Beihe Road, Jiading, shanghai, china Tel：+86-21-33517528 Fax：+86-21-33517538

Neturen America Corporation2995 Moser Court, Hamilton, Ohio, USA Tel：+1-513-863-1900 Fax：+1-513-863-1147

Neturen Czech s.r.o.Jizni 1079, Bitozeves-Prumyslova zona Triangle, 438 01 Bitozeves, Czech Republic Tel：+420-415-652-239 Fax：+420-415-240-311

NETURENInduction Tempered WireNETURENInduction Tempered WireNETURENInduction Tempered Wire

Tempered Spring Steel Wire

NETUREN CO.,LTD. 2-17-1, Higashi-gotanda, Shinagawa-ku, Tokyo 141-8639, Japan　Tel : +81-3-3443-5444　Fax : +81-3-5488-7538