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L. M. Chart
Aluminum Alloy and its Spproximate Equivalents
UK / INDIA ISO EN AC- FRANCE GERMANY ITALY UNI USA
AA / ASTM
USA
SAE
JAPAN
LM 0 Al 99.5   A5   3950 150    
LM 2 Al-Si10Cu2Fe 46 100 A-S9U3-Y4   5076 384 383 ADC 12
LM 4 Al-Si5Cu3 45 200 A-S5U3 G-AlSi6Cu4
(225)
3052 319 326 AC 2A
LM 5 Al-Mg5Sil
AlMg6
51 300 AG6 G-AlMg5
(244)
3058 514 320 AC 7A
LM 6 Al-Si12
Al-Si12Fe
44 100 AS 13 G-AlSi12
(230)
4514 A413   AC 3A
LM 9 Al-Si10Mg 43 100 A-S10G G-AlSi10Mg
(233)
3049 A360 309 AC 4A
LM 12 Al-Cu10Si2Mg   A-U10G   3041 222 34  
LM 13 Al-Si12Cu
Al-Si12CuFe
48 000 A-S12UN   3050 336 321 AC 8A
LM 16 Al-Si5Cu1Mg 45 300 A-S4UG   3600 355 322 AC 4D
LM 20 Al-Si12Cu
Al-Si12CuFe
47 000 A-S12-Y4 G-AlSi12(Cu)
(231)
5079 A413 305  
LM 21 Al-Si6Cu4 45 000 A-S5U2 G-AlSi6Cu4
(225)
7369/4 308 326 AC 2A
LM 22 Al-Si5Cu3 45 400 A-S5U G-AlSi6Cu4
(225)
3052 319 326 AC 2A
LM 24 Al-Si8Cu3Fe 46 500 A-S9U3A-Y4 G-AlSi8Cu3
(226)
5075
3601
A380 306 AC 4B
ADC10
LM 25 Al-Si7Mg 42 000 A-S7G G-AlSi7Mg 3599 A356 323 AC 4C
LM 26 Al-Si9Cu3Mg-   A-S7U3G   3050 332 332  
LM 27 Al-Si7Cu2Mn0.5 46 600     7369     AC 2B
LM 28 Al-Si19CuMgNi       6251      
LM 29 Al-Si23CuMgNi       6251      
LM 30 Al-Si17Cu4Mg         390    
                 
LM 31 Al-Zn5 71 000 A-Z5G   3602 712 310  
 
Aluminum Alloy and its Recommended end use
LM 0 Alloy suitable for Sand Casting, components for Electrical, Chemical and Food Processing Industries.
LM 2 One of the two most widely used alloys for all types of die-castings.
LM 4 The most versatile of the alloys, has very good casting characteristics and isused for a very wide range of applications.
  Strength and Hardness can be grately incresed by Heat Treatment.
LM 5 Suitable for Sand and Chill Castings requiring maximul corrosion resistance i.e.castings of marine application.
LM 6 Suitable for large, intricate and thin walled castings in all types of moulds, also used where corrosion resistance or ductility is required.
LM 9 Used for allplications especially low pressure die casting requiring the characteristics of LM 6 with higher tensile strength after heat treatment.
LM 12 Mainly used for sand and chill castings requiring high strength and shock resistance. Requires special foundry techniques and heat treatment.
LM 13 Mainly used for piston and applications where thermal stresses are more. This alloy can witstand higher termperatures and loads.It has good wear resistance properties and machinability. Requires heat treatment.
LM 16 Suitable where high mechanical properties are desired in fairly intricate sand and chill castings. Requires heat treatment.
LM 20 Mainly used for pressure die casting. Similar to LM 6 but with better machinability and hardness.
LM 21 Generally similar to LM 4M in character and application but better machinability and proof strength.
LM 22 Used for chill castings requiring good foundry characteristics and good ductility. Requires heat treatment.
LM 24 Suitable for large, intricate and thin walled castings in all types of moulds, also used where corrosion resistance or ductiity is required.
LM 25 Suitable where good corrosion resistance combined with thermal properties are required. Strength is attained by heat treatment.
LM 26 Mainly used for pistons as alternate to LM 13.
LM 27 A versatile sand and chill cast alloy introduced as an alternative to LM 4 and LM 21.
LM 28 Piston alloy with lower coefficient of thermal expansion than LM 13. This alloy use requires special foundry technique.
LM 29 Same characteristics as LM 28 but with still lower coefficient of thermal expansion than LM 28.
LM 30 For unlined die cast cylinder blocks with low expansion and excellent wear resistance.
LM 31  
 
Chemical Compositon of Alloys (As per BS 1490:1988 Std.)
Alloy Cu Mg Si Fe Mn Ni Zn Pb Sn Ti Additional
Elements
Others
LM 0 0.03 0.03 0.3 0.4 0.03 0.03 0.07 0.03 0.03   Al 99.50 min  
LM 2 0.7 - 2.5 0.3 9.0 - 11.5 1 0.5 0.5 2 0.3 0.2 0.2   0.5
LM 4 2.0 - 4.0 0.2 4.0 - 6.0 0.8 0.2 - 0.6 0.3 0.5 0.1 0.1 0.2   0.2
LM 5 0.1 3.0 - 6.0 0.3 0.6 0.3 - 0.7 0.1 0.1 0.05 0.05 0.2   0.2
LM 6 0.1 0.1 10.0 - 13.0 0.6 0.5 0.1 0.1 0.1 0.05 0.2   0.2
LM 9 0.2 0.2 - 0.6 10.0 - 13.0 0.6 0.3 - 0.7 0.1 0.1 0.1 0.05 0.2    
LM 12 9.0 - 11.0 0.2 - 0.4 2.5 1 0.6 0.5 0.8 0.1 0.1 0.2   0.2
LM 13 0.7- 1.5 0.8 - 1.5 10.5 - 13.0 1 0.5 1.5 0.5 0.1 0.1 0.2    
LM 16 1.0 - 1.5 0.4 - 0.6 4.5 - 5.5 0.6 0.5 0.25 0.1 0.1 0.05 0.2    
LM 20 0.4 0.2 10.0 - 13.0 1 0.5 0.1 0.2 0.1 0.1 0.2    
LM 21 3.0 - 5.0 0.1 - 0.3 5.0 - 7.0 1 0.2 - 0.6 0.3 2 0.2 0.1 0.2    
LM 22 2.8 - 3.8 0.05 4.0 - 6.0 0.6 0.2 - 0.6 0.15 0.15 0.1 0.05 0.2    
LM 24 3.0 - 4.0 0.3 7.5 - 9.5 1.3 0.5 0.5 3 0.3 0.2 0.2    
LM 25 0.2 0.2 - 0.6 6.5 - 7.5 0.5 0.3 0.1 0.1 0.1 0.05 0.2    
LM 26 2.0 - 4.0 0.5 - 1.5 8.5 - 10.5 1.2 0.5 1 1 0.2 0.1 0.2    
LM 27 1.5 - 2.5 0.35 6.0 - 8.0 0.8 0.2 - 0.6 0.3 1 0.2 0.1 0.2    
LM 28 1.3 - 1.8 0.8 - 1.5 17.0 - 20.0 0.7 0.6 0.8 - 1.5 0.2 0.1 0.1 0.2    
LM 29 0.8 - 1.3 0.8 - 1.3 22.0 - 25.0 0.7 0.6 0.8 -1.3 0.2 0.1 0.1 0.2    
LM 30 4.0 - 5.0 0.4 - 0.7 16.0 - 18.0 1.1 0.3 0.1 0.2 0.1 0.1 0.2    
LM 31 0.1 0.5 - 0.75 0.25 0.5 0.1 0.1 4.8 - 5.7 0.05 0.05 0.2    
 
 
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