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Aluminum Alloy Piston Materials

Mechanical Properties

Heat Treatment

Chemical Composition Limits of Ni-Resist (Alfin)

Chemical Composition Limits of Piston Pin

 

 

Aluminum Alloy Piston Materials
Chemical Composition Percentage
NO. Cu Mg Ni Si Ti Fe Zn Mn
AC5A 3.5-4.5 1.2-1.8 1.7-2.3 <0.6 <0.2 <0.8 <0.1 <0.1
AC8A 0.8-1.3 0.8-1.5 1.0-1.5 11.0-13.0 <0.2 <0.8 <0.5 <0.5
AC8B 2.0-4.0 0.5-1.5 0.5-1.0 8.5-10.5 <0.2 <0.8 <0.5 <0.5
AC9A 0.5-2.5 0.5-1.5 0.5-1.5 22.0-24.0 <0.2 <0.8 <0.2 <0.5
AC9B 0.5-2.5 0.5-1.5 0.5-1.5 22.0-24.0 <0.2 <0.8 <0.2 <0.5
AC9C 0.0-2.5 0.5-1.5 0.5-1.5 18.0-20.0 <0.2 <0.8 <0.2 <0.5
AS-23 0.5-2.5 0.5-2.5 0.5-1.5 22.0-24.0 <0.5 <0.8 <0.5 <0.5
TS-20(TWL) 0.5-2.5 0.5-1.5 0.5-1.5 19.0-22.0 <0.5 <0.8 <0.5 <0.5

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Mechanical Properties
NO.Heat TreatmentTensile StrengthHardnessElongationThermal ExpansionSpecific Gravity
(kg/mm2) % 20o-100oC 20o-200oC 20o-300oC g/cm3
AC5A T6 <30 63-75 >0.821.3 x 10-6 22.7 x 10-6 24.5 x 10-6 2.83
T7 <26 54-66 >1.0
AC8A T6 <28 64-74 >0.519.2 x 10-6 20.6 x 10-6 21.9 x 10-6 2.73
T7 <25 55-65 >0.6
AC8B T5 <23 57-69 >0.520.2 x 10-6 21.6 x 10-6 23.1 x 10-6 2.75
T6 <28 64-74 >0.5
T7 <25 54-66 >0.6
TS-20 T5 <20 57-69 >0.3        
T6 <22 64-74 >0.3
T7 <21 55-65 >0.3
AS23 T6 <18 63-75 >0.316.5 x 10-6 16.5 x 10-6 18.0 x 10-6 2.68
T7 <18 54-66 >0.3
TS-20 T5 <20 57-69 >0.37.2 x 10-6 18.6 x 10-6 20.1 x 10-6 2.7
T6 <22 64-74 >0.3
T7 <21 55-65 >0.3

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Heat Treatment
Type Annealing Hour Quenching Re-annealing Hour
T5   170o-200oC 10HRS     
T6475o-510oC 8HR475o-510oC175o-205oC 10-12HRS
T7470o-510oC 8HR470o-510oC210o-240oC 10-16HRS

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Chemical Composition Limits of Ni-Resist (Alfin) %
Hardness: HB 130-200 HRB: 73-93
No. T.C Si Mn Ni Cu Cr Fe
Ni-Resist <3.0 1.0-2.8 0.5-1.5 13.5-17.5 5.5-7.5 1.5-2.5 Ba1

 

 

Chemical Composition Limits of Piston Pin %
No. C Si Mn P S Mo Cr
SCM-21 0.13-0.18 0.15-0.35 0.60-0.85 <0.030 <0.030 0.15-0.35 0.90-1.20
SCM-22 0.13-0.23 0.15-0.35 0.60-0.85 <0.030 <0.030 0.15-0.35 0.90-1.20

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Last modified : 10/08/03