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ASTM A732 A732M for Carbon Steel Castings in Steel Foundry in China

ASTM A732 grades include 1A, 2A, 2Q, 3A, 3Q, 4A, 4Q, 5N, 6N, 7Q, 8Q, 9Q, 10Q, 11Q, 12Q, 13Q, 14Q, 15A. The following is their chemical and mechanical requirements.

This standard is for carbon and low-alloy steel and cobalt alloy castings made by the investment casting process.

Steel castings shall be heat treated either by full annealing, normalizing, normalizing and tempering, or quenching and tempering to obtain the specified properties or other properties that have been agreed upon within each grade.

All steel castings shall conform to the requirements for chemical composition specified. 

 

Chemical Requirements 

Grade  1A  2A,2Q  3A,3Q  4A,4Q  5N  6N  7Q  8Q 
Type  Low Carbon  Medium  Medium  Medium  Vanadium  Manganese  Chromium  Chromium 
    Carbon  Carbon  Carbon    Molybdenum  Molybdenum  Molybdenum 
  IC 1020A  IC 1030  IC 1040  IC 1050  IC 6120  IC 4020  IC 4130  IC 4140 
Carbon  0.15 to 0.25  0.25 to 0.35  0.35 to 0.45  0.45 to 0.55  0.30 max  0.35 max  0.25 to 0.35  0.35 to 0.45 
Manganese  0.20 to 0.60  0.70 to 1.00  0.70 to 1.00  0.70 to 1.00  0.70 to 1.00  1.35 to 1.75  0.40 to 0.70  0.70 to 1.00 
Phosphorus, max  0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04
Sulfur, max  0.045 0.045 0.045 0.045 0.045 0.045 0.045 0.045
Silicon  0.20 to 1.00  0.20 to 1.00  0.20 to 1.00  0.20 to 1.00  0.20 to 0.80  0.20 to 0.80  0.20 to 0.80  0.20 to 0.80 
Nickel                 
Chromium              0.80 to 1.10  0.80 to 1.10 
Molybdenum            0.25 to 0.55  0.15 to 0.25  0.15 to 0.25 
Vanadium          0.05 to 0.15       
Residual Elements:                 
Copper  0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Nickel  0.5 0.5 0.5   0.5 0.5   0.5
Chromium  0.35 0.35 0.35   0.35 0.35    
Molybdenum Tungsten  0.25       0.25      
Tungsten    0.1 0.1 0.1   0.25 0.1 0.1
Total content of these  1 1 1 0.6 1 1 0.6 1
residual elements                 

  

Grade  9Q  10Q  11Q  12Q  13Q  14Q  15A 
Type  Chrome Nickel  Chrome Nickel  Nickel Chromium  Chrome Nickel  Chrome Nickel  Chromium 
  Molybdenum  Molybdenum  Molybdenum Vanadium  Molybdenum  Molybdenum   
  IC 4330  IC 4340  IC 4620  IC 6150  IC 8620  IC 8630  IC 52100 
Carbon  0.25 to 0.35  0.35 to 0.45  0.15 to 0.25  0.45 to 0.55  0.15 to 0.25  0.25 to 0.35  0.95 to 1.10 
Manganese  0.40 to 0.70  0.70 to 1.00  0.40 to 0.70  0.65 to 0.95  0.65 to 0.95  0.65 to 0.95  0.25 to 0.55 
Phosphorus, max  0.04 0.04 0.04 0.04 0.04 0.04 0.04
Sulfur, max  0.045 0.045 0.045 0.045 0.045 0.045 0.045
Silicon  0.20 to 0.80  0.20 to 0.80  0.20 to 0.80  0.20 to 0.80  0.20 to 0.80  0.20 to 0.80  0.20 to 0.80 
Nickel  1.65 to 2.00  1.65 to 2.00  1.65 to 2.00    0.40 to 0.70  0.40 to 0.70   
Chromium  0.70 to 0.90  0.70 to 0.90    0.80 to 1.10  0.40 to 0.70  0.40 to 0.70  1.30 to 1.60 
Molybdenum  0.20 to 0.30  0.20 to 0.30  0.20 to 0.30    0.15 to 0.25  0.15 to 0.25   
Vanadium        0.15 min       
Residual Elements:               
Copper  0.5 0.5 0.5 0.5 0.5 0.5 0.5
Nickel        0.5     0.5
Chromium      0.35        
Molybdenum Tungsten        0.1      
Tungsten  0.1 0.1 0.1   0.1 0.1 0.1
Total content of these  0.6 1 1 1 1 1 0.6
residual elements               
Investment Casting (IC) numbers are to be used only for nomenclature comparison.       

 

TABLE Chemical Requirements-Cobalt Alloys 
Grade 21 31
Carbon  0.200.30  0.450.55 
Manganese, max.  1 1
Silicon, max  1 1
Phosphorus, max  0.04 0.04
Sulfur, max  0.04 0.04
Chromium  25.029.0  24.526.5 
Nickel  1.73.8  9.511.5 
Cobalt  remainder  remainder 
Molybdenum  5.06.0  ..
Tungsten  .. 7.08.0 
Iron, max.  3 2
Boron  0.007 max  0.0050.015 

 

Tensile Requirements 
Grade    Tensile strength, min    Yield strength, min  Elongation, in 2-in.  Heat 
  ksi  [MPa]  ksi  [MPa]  [50-mm] or diameters  Treatment 
1A  60 [414]  40 [276]  24 AA 
2A  65 [448]  45 [310]  25  
2Q  85 [586]  60 [414]  10 TB 
3A  75 [517]  48 [331]  25  
3Q  100 [689]  90 [621]  10  
4A  90 [621]  50 [345]  20  
4Q  125 [862]  100 [689]     
5N  85 [586]  55 [379]  22 TC 
6N  90 [621]  60 [414]  20  
7Q  150 [1030]  115 [793]     
8Q  180 [1241]  145 [1000]     
9Q  150 [1030]  115 [793]     
10Q  180 [1241]  145 [1000]     
11 120 [827]  100 [689]  10  
12Q  190 [1310]  170 [1172]     
13Q  105 [724]  85 [586]  10  
14Q  150 [1030]  115 [793]     
15AD  .. .. .. .. ..  

Annealed. Quenched and tempered. Normalized and tempered. Hardness Rockwell B, 100 max.  

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