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What are 316L, 904L and Surgical Grade Stainless Steel ?

2009-Oct-6
 
Comparison among 316L, 904L, surgical grade stainless steels
 
Composition ranges
Grade   C Mn Si P S Cr Mo Ni N Cu
316 Min - - - 0 - 16.0 2.00 10.0 - -
Max 0.08 2.0 0.75 0.045 0.03 18.0 3.00 14.0 - -
316L Min - - - - - 16.0 2.00 10.0 - -
Max 0.03 2.0 0.75 0.045 0.03 18.0 3.00 14.0 0.10 -
904L Min - - - - - 19.0 4.0 23.0 - 1.0
Max 0.020 2.00 1.00 0.045 0.035 23.0 5.0 28.0 - 2.0
420 Min 0.15 - - - - 12.0 - - - -
Max - 1.00 1.00 0.040 0.030 14.0 - - - -
440A Min 0.65 - - - - 16.00 - - - -
Max 0.75 1.00 1.00 0.040 0.030 18.00 0.75 - - -
440B Min 0.75 - - - - 16.00 - - - -
Max 0.95 1.00 1.00 0.040 0.030 18.00 0.75 - - -
440C Min 0.95 - - - - 16.00 - - - -
Max 1.20 1.00 1.00 0.040 0.060 18.00 0.75 - - -
 
Mechanical properties
        Hardness
Grade Tempering
Temp. (°C)
Tensile Strength
(MPa) min
Yield Strength
0.2% Proof
(MPa) min
Elongation
(% in 50mm)
min

Rockwell B
(HR B) max

Brinell
(HB) max
Impact
Charpy V
(J)
316 - 515 205 40 95 217  
316L - 485 170 40 95 217  
904L - 490 220 35 70-90 typical -  
               
440C 204 2030 1900 4 59 - 9
260 1960 1830 4 57 - 9
316 1860 1740 4 56 - 9
371 1790 1660 4 56 - 9
 
Typical physical properties
Grade Density
(kg/m3)
Elastic
Modulus
(GPa)
Mean Co-eff of Thermal
Expansion (μm/m/°C)
Thermal
Conductivity
(W/m.K)
Specific
Heat
0 - 100 °C
(J/kg.K)
Elec
Resistivity
(nΩ.m)
      0 - 100 °C 0 - 315 °C 0 - 538 °C At 100 °C At 500 °C    
316 / L / H 8000 193 15.9 16.2 17.5 16.3 21.5 500 740
                   
            At 20 °C At 500 °C    
904L 8000 200 15 - - 13 - 500 850
                   
            At 100 °C At 500 °C    
420
(annealed
condition)
7750 200 10.3 10.8 11.7 24.9 - 460 550
                   
            At 100 °C At 500 °C    
440A/B/C 7650 200 10.1 10.3 11.7 24.2 - 460 600
 
P. 1 , 2 , 3
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