50 



HANDBOOK OF MECHANICAL DESIGN 

 PROPERTIES OF U.S.S. STAINLESS STEEL 



AUoy 



Typical chemical composition 



Carbon 



Manganese 



Phosphorus 



Sulphur 



Silicon 



Chroniium 



Nickel 



Titanium 



Columbium 



Physical properties 



Density. lb. per cu. in 



Specific electrical resistance at 68°r.: 



Microhms per cc 



Microhms per cu. in 



Low-carbon steel = 1.00 



Melting range, deg. F 



Structure 



Magnetic permeability; 



As annealed 



After 10 per cent reduction of area. . . . 

 Specific heat: 



B.t.u./deg. F./lb., at 32-212°F 



Low-carbon steel = 1.00 (0-100°C.).. 

 Thermal conductivity: 



B.t.u./sq. ft./hr./deg. F./in., at212°r 



Low-carbon steel = 1.00, at 100°C. . . 



B.t.u./sq. ft./hr./deg. F./in., at 932°F 

 Coefficient of thermal expansion: 



Per deg. F. X 10» (32-212°F.) 



Per deg. F. X 10» (32-932°F.) 



U.S.S. 18-8 



Type 302* 



. 08/20 

 1 .25 max. 

 0.03 max. 

 0.03 max. 

 0.75 max. 

 18.0/20.0 

 8.0/10.0 



0.286 



70 (cold worked, 

 70-82) 

 27.6 (cold worked. 

 27 . 6-32 . 3) 



6.4 

 2550-2590 

 Austenitic 



= 1 

 = 1 



003 

 10 



0.12 

 1.1 



113 



0. 



150 



9. 



10. 



33 



Type 304 



0.08 max. 

 2.00 max. 

 0.03 max. 

 0.03 max. 

 0.75 max. 

 18.0/20.0 

 8.0/10.0 



0.286 



70 (cold worked, 

 70-82) 

 27 . 6 (cold worked, 

 27 . 6-32 . 3) 

 6.4 

 2550-2590 

 Austenitic 



003 

 10 



0. 

 1. 



113 



0. 



150 



9.6 

 10.2 



U.S.S. stabihzed 18-8 



Type 321 



0.10 max. 

 2.00 max. 

 0.03 max. 

 0.03 max. 

 0.75 max. 

 17.0/20.0 

 7.0/10.0 

 4 X C min. 



0.285 

 71 



28 



6.5 

 2550-2590 

 Austenitic 



^ = 1 . 003 

 ji = 1.10 



0.12 

 1.1 



112 



0.32 

 153 



9.3 

 10.3 



Type 347 



. 10 max. 

 2.00 max. 

 0.03 max. 

 0.03 max. 

 .75 max. 

 17.0/20.0 

 8.0/12.0 



10 X C 



0.285 

 71 



2550-2590 

 Austenitic 



n = 1 . 003 

 It = 1.10 



0.12 

 1.1 



112 



0.32 

 153 



9.3 



10.3 



Mechanical properties at room 

 \ temperatures 



Annealed 



Cold 

 worked 



Annealed 



Cold 

 worked 



Annealed 



Cold 

 worked 



Annealed 



Cold 

 worked 



Tensile strength, 10^ lb. per sq. in 



Yield point, 10' lb. per sq. in 



Modulus of elasticity. 10^ lb. per sq. in 



Elongation in 2 in., per cent 



Reduction of area, per cent 



Charpy impact strength, ft. -lb 



Izod impact strength, ft. -lb 



Endurance Umit (fatigue), 10» lb. per sq. in. 



Brinell hardness number 



Rockwell hardness number _. 



Stress causing 1 per cent elongation (creep) 

 in 10,000 hr.: 



At 1000°F., lb. per sq. in 



At 1200°F., lb. per sq. in 



At 1350°F., lb. per sq. in 



At 1500°F.. lb. per sq. in. 



Scaling temperature, deg. F. (approx.) 



Initial forging temperature, deg. F 



Finishing temperature, deg. F 



.A.nneaUng treatment. 



80- 95 

 35- 45 



29 

 55- 60 

 55- 65 



105-300t 

 60-250 

 29- 26 

 50- 2 

 65- 30 



80- 95 

 35- 45 



29 

 55- 60 

 55- 65 



75-110 



35 

 135-185 

 B75-B90 



90- 95 

 170-460 

 C5-C47 



75-110 

 35 

 138-185 

 B75-B90 



105-300t 

 60-250 

 29- 26 

 50- 2 

 65- 30 



90- 95 

 170-460 

 C5-C47 



Cold forming, drawing, stamping 



Machinability 



Welding (arc. gas. resistance, atomic hydro. 

 geK) 



Precautions (see notes) 



17,000 



7.000 



3.000 

 850 



1,650 



2.200 

 f Not under 



\ 1600-1700 



f 1900-2000°F. 

 I and quench 



Excellent 

 Fair tough 

 Very good, anneal 

 after welding for maxi- 

 mum corrosion 

 resistance 

 (A) 



17,000 



7.000 



3,000 



850 



1,650 



2,200 



Not under 



1600-1700 



1900-2000°F. 



and quench 



Good 

 Fair tough 

 Very good, anneal 

 heavier than J-s in. 

 for maximum corro- 

 sion resistance 

 U) 



80- 95 

 35- 45 



29 

 50- 55 

 55- 65 



77 



45 

 135-185 

 B75-B90 



105-300t 

 60-250 

 29- 26 

 50- 2 

 65- 30 



90- 95 

 170^60 

 C5-C47 



17,000 



7.000 



3.000 



850 



1,650 



2,200 



Not under 



1600-1700 



1900-2000°F. 



and quench 



Good 



Fair tough 



Very good, not 



necessary to anneal 



(B) 



80- 95 

 35- 45 



29 

 50- 55 

 55- 65 



77 



45 

 135-185 

 B75-B90 



105-300t 

 60-250 

 29- 26 

 50- 2 

 65- 30 



90- 95 

 170-460 

 C5-C47 



17,000 



7,000 



3,000 



i 850 



1.650 



2.200 



Not under 



1600-1700 



1900-2000°F. 



and quench 



i Good 

 [Fair tough 

 Very good,; not 

 necessary to anneal 



(B) 



* U.S.S. 18-8 free machining. Type 303. same as 302 except S or Se 0.07 min. or molybdenum 0.60 max. 

 t Commercial grades, thin gages of sheet and strip 



i-i Hard = 125.000 lb. per sq. in. 



i-i Hard = 150.000 lb. per sq. in. 



% Hard = 175.000 lb. per sq. in. 



Full hard = 185.000 lb. per sq. in. 



