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Induction Heated, Quenched and TemperedITW
Spring Steel Wire “ITWTM”
Fine Heat Technology
Zatec, CzechShanghai,China
Ako, Japan
Hamilton, OhioUSA
an
Hamilton, OhioHamiltUUSAS
C
◆Fig.1 Production History of ITWTM
Company Name Location EstablishmentNeturen Co., Ltd., Ako Plant ・・・・・・・・ Ako, Hyogo, Japan ・・・・・・・・・1946 (1977*)Shanghai Neturen Co., Ltd.・・・・・・・・・・ Shanghai, China ・・・・・・・・・・・・・2003Neturen America Corp.・・・・・・・・・・・・・・・ Hamilton, Ohio, USA ・・・・・・・2007Neturen Czech s.r.o. ・・・・・・・・・・・・・・・・・・・ Zatec, Usti, Czech ・・・・・・・・・2012
Note(*): Neturen started producing and selling “ITWTM” in 1977.
Note(*): "ITW" is Neturen's trademark registerd at the USPTO. (Reg. No. 4,356,357)
AsiaEurope AmericaAsiaEurope America
Year
JPN AKO
CHINA SN
USA NAC
CZECH(NCZ)
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
2000
1999
1998
1997
1996
1995
1994
1993
1992
CZECH (NCZ)USA (NAC)CHINA (SN)JAPAN (AKO)
ITW World Wide Sales History (1992-2015)
Temper
Heating
Cooling
IH(ElectricPower)
Water
Lead Bath
Water
Fine and uniform micro-structure can be obtained by selecting suitable heating and cooling conditions.
◆Table 1. Comparison between the Process of ITW vs. OTW
Alternating Flux
Eddy Current
Conductor Coil
Heating Object
High-FrequencyPower Supply
◆Fig.2 Principle of Induction Heating ◆Fig. 3 Induction Hardening Process for ITW
◆Fig. 4 CO2 Emissions Comparison
Tem
p.
. Water Cooling
Time
Surface
IH Heating
Core
Plasma nitriding 0.05 0.036
0.152
0.103
0.078
0.107
0.179
Direct emissions (gas)
Indirect emissions (electricity)
Normal gascarburizing
Vacuumcarburizing
Inductionhardening
0 0.05 0.1 0.15 0.2 0.25 0.3kg-CO2/kg-work
0.35
OTWITWQuench
Heating
Cooling
IH(ElectricPower)
Water
Gas
Oil
IH process provides rapid and short time heating through SELF-HEATING effect.
To provide Economical & Ecological IH Heat-Treatment System simply using electrical energy and water
■ Affiliate companies manufacturing NETUREN Induction Tempered Wire;
Shanghai Neturen Co., Ltd. 651 Beihe Road, Jiading, Shanghai, China Tel:+86-21-3351-7528 Fax:+86-21-3351-7538
Neturen America Corporation2995 Moser Court, Hamilton, Ohio, USA Tel:+1-513-863-1900 Fax:+1-513-863-1147
Neturen Czech s.r.o.Průmyslová zóna Triangle, Nehasice 1079, Bitozeves, 438 01 pošta Žatec, Czech republic Tel:+420-415-652-239 Fax:+420-415-240-311
NETUREN CO.,LTD. 2-17-1, Higashi-gotanda, Shinagawa-ku, Tokyo 141-8639, Japan Tel : +81-3-3443-5444 Fax : +81-3-5488-7538
Neturen and its Group contentiously focus on “ITWTM” manufacturing. ITWTM is an abbreviation of “Induction Heated Quenched and Tempered Wire”, which has a high strength such as 2,000MPa (290ksi) and suitable for the cold forming process of springs. ITWTM provides the weight reduction and compact design for coil springs with the higher fatigue performance and higher sag resistance.
Grade Symbol
SWI-170SWI-180SWI-190SWI-200
Min. 35Min. 35Min. 35Min. 35
Max. 0.05Max. 0.05Max. 0.05Max. 0.05
±0.05±0.05±0.05±0.05
Reduction of Area (%) Roundness (mm) Tolerance (mm)Tensile Strength
◆Table 2. Specification of ITW
◆Fig.5 Application of ITWTM
■〔BASIC〕ITW Diameter Range:7.00 ~ 16.00 mm (0.275 ~ 0.630 inch)
(ksi)(MPa)1650-17501750-18501850-19501950-2050
240-254254-270270-283283-296
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