Hypereutectic Al-Si Alloy: Enhanced Wear Resistance and Low Shrinkage

• Customization: Available
• Application: Transportation Tools
• Certification: RoHS, ISO9001, JIS, EN
• Grade: --
• Temper: --
• Surface Treatment: Mill Finish
• Alloy: Alloy
• Transport Package: Export Standard Wooden Pallet
• Specification: According to Customer Requirement
• Trademark: Chalco Aluminum
• Origin: Henan China
• HS Code: 7606125900
• Production Capacity: 15000mt/Month

Product Description

Hypereutectic Al-Si Alloy

Hypereutectic aluminum-silicon alloy has the characteristics of wear resistance, heat resistance, corrosion resistance, small thermal expansion coefficient and good volume stability. It is an ideal material for manufacturing key components of the engine-cylinders and pistons. It replaces the eutectic aluminum-silicon alloy ZL109, Hypoeutectic aluminum-silicon alloy or steel materials can solve the problems of engine pulling, holding cylinder, oil blow-by, gas blow-by, carbon deposit, fuel consumption, noise increase, etc., making the car lighter, faster, and more powerful. Larger, lower fuel consumption and lower noise.
The engine pistons and cylinders of hypereutectic aluminum-silicon alloy can also be applied to diesel engines, air-conditioning compressors, motorcycles, trucks, tractors, agricultural vehicles, agricultural machinery, construction machinery, tanks, etc.

The characteristics of hypereutectic aluminum silicon alloy

1. Good wear resistance (25~40% higher than eutectic or hypoeutectic aluminum-silicon alloy)
2. Small thermal expansion coefficient, good dimensional stability
3. Good heat and corrosion resistance
4. High strength (20~40% higher than eutectic or hypoeutectic aluminum silicon alloy)
5. Good weight reduction effect (replacement of steel can reduce weight by more than 50%)

Standard grades of hypereutectic aluminum silicon alloy

Alloy	Country	Si	Cu	Mg	Mn	Ni	Fe	Ti	Other
A390	USA	16~18	4.5	0.55	0.1	-	0.5	<0.1	-
X(A)392	USA	19.0	0.7	0.1	0.4	-	1.0	-	-
AS-18UNG	France	16.5~19.5	0.8~1.5	0.8~1.5	0.2	0.8~1.3	0.75	0.2	Zn≤0.2
AC9B	Japan	18~20	0.5~1.5	0.5~1.5	≤0.1	0.5~1.5	<0.8	<0.2	Zn<0.5
C32	Japan	20~24	2.0~3.5	0.1~1.0	0.5	0.2~2.0	0.8	-	Cr:0.2~2
KS283	Germany	17~19	4.7~5.3	0.4~0.6	0.6~0.8	3.8~4.2	0.7	-	Zn:0.2
KS281	Germany	19~21	1.3~1.7	1.3~1..7	0.4~0.6	0.8~1.3	0.7	0.2	Zn:0.2
LM28	UK	17~20	1.3~1.8	0.8~1.5	0.6	0.8~1.5	0.7	0.2	Cr:0.6
LM29	UK	22~25	0.8~1.3	0.8~1.3	0.6	0.8~1.3	0.7	0.2	Cr:0.6
YLD117	China	16~18	4.0~5.0	0.5~0.65	<0.5	1.5	-	-	-
ZLD118	China	19~22	1.0~2.0	0.5~0.8	0.3~0.5	<0.3	<0.9	<0.2	RE:0.6~1.5

Executive standard:
Standard of the Ministry of Aviation Industry of the People's Republic of China "HB 5372-87 Cast Aluminum Alloy Ingot"
National Standard of the People's Republic of China "GB/T 8733-2007 Cast Aluminum Alloy Ingot"
American National Standard "ASTMB179-2006 Aluminum Alloy Ingot for Casting"
Japanese National Standard "JIS H2211-1999 Aluminum Alloy Ingot for Casting"

Product performance
1. After the deterioration, the distribution of primary crystal silicon is more uniform, the tips and corners disappear and become smoother edges, the size is between 20~40μm;
2. The original long strip of eutectic Si has been transformed into a short rod shape with a length of 3~8μm.

Performance comparison of aluminum-silicon alloy for engine

Product	Hardness HV	Tensile strength (room temperature) /MPa	Tensile strength (300ºC)/MPa	Linear expansion coefficient ×10-6	abrasion loss/mg
Domestic eutectic aluminum silicon alloy ZLD109	100~120	230~250	50~75	-	-
Imported hypereutectic aluminum silicon alloy A390	110~130	250~260	95~105	19~20	30~50
New type hypereutectic aluminum silicon alloy developed by our company	120~140	280~310	130~170	18~19	30~45

Note : Test the amount of wear under the conditions of sliding speed of 0.5m/s, load of 60N, and wear time of 1 h.

Hypereutectic Al-Si alloy products and specifications:
1. Hypereutectic aluminum-silicon alloy long ingot, about 6.4kg/piece, 680mm (length) × 100mm (upper width)/75 (lower width) × 42mm (thickness)
2. Hypereutectic aluminum-silicon alloy round cast rod, product specifications: diameter Φ90mm~300mm;
3. Hypereutectic aluminum silicon alloy parts, such as engine pistons, cylinder liners, etc.

Detailed Photos