Annealed Spring Steel Physical & Chemical Properties

Spheroidized Annealed Spring Steel
ASTM A684
Alloy  Temper UNS Designation 
 1050  Annealed  G10500
 1074/1075  Annealed  G10740/10750
 1095  Annealed  G10950


Annealed Spring Steel Chemical Composition
ASTM A684
Alloy  Rockwell (approx)  Carbon  Manganese Phosphorus (max)  Sulfur (max)  Silicon 
1050  B-84 (max)  048-.55  .60-.90  0.03  0.035  .15-.30
1074/1075  B-86 (max)  .70-.80  .50-.70  0.03  0.035  .15-.30
1095  B-86 (max)  .90-1.03  .30-.50  0.03  0.035  .15-.30


Annealed Spring Steel Suggested Heat Treatments
ASTM A684
Formed Springs
 Requiring Heat Treatment  AISI - 1050 - SAE  AISI - 1074 - SAE  AISI - 1095 - SAE
 Normalizing Temp  1550 - 1650 F  1550 - 1650 F  1550 - 1650 F
 Annealing Temp  1400 - 1500 F  1400 - 1500 F  1400 - 1500 F
 Hardening Temp  1500 - 1550 F  1475 - 1550 F  1440 - 1475 F
 As Oil Quenched  RC 58  RC 64  RC 66
   Rockwell Tensile PSI  Rockwell Tensile PSI  Rockwell Tensile PSI
 Drawing Temp. 400 F  RC 52 250,000  RC 59 305,000  RC 62 320,000
 Drawing Temp. 600 F  RC 45 210,000  RC 53 255,000  RC 55 270,000
 Drawing Temp. 700 F  RC 39 180,000  RC 47 230,000  RC 49 238,000
 Drawing Temp. 800 F  RC 35 160,000  RC 44 205,000 RC 45 212,000 
 Drawing Temp. 900 F  RC 31 139,000  RC 40 182,000 RC 41 189,000 
 Drawing Temp. 1000 F  RC 27 124,000  RC 36 162,000  RC 38 176,000
 Drawing Temp. 1100 F  RC 22 112,000  RC 32 140,000  RC 34 155,000
 Drawing Temp. 1200 F  N/A N/A  RC 26 122,000  RC 30 138,000
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