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Ensinger PEI

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AISI Type S21800 Stainless Steel
Categories: Metal; Ferrous Metal; Heat Resisting; Stainless Steel; T S20000 Series Stainless Steel
Material Notes: Galling and wear resistant, austenitic. Corrosion resistance better than type 304 in most media and pitting resistance superior than type 316. Room temperature yield strength about 2 times type 304. Excellent high-temperature oxidation resistance and low-temperature impact resistance. Applications include valve stems, seats and trim, nuts and bolts, screening, chain drive systems, and pins, bushings, and roller bearings. 2317 MPa fracture strength.
Key Words: UNS S21800, ASME Code Case 1817, ASTM A193 (grade B8S), ASTM A194 (grade 8S), ASTM A276, ASTM A479, ASTM A580
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Physical PropertiesOriginal ValueComments
Density 7.61 g/cc
 
Mechanical PropertiesOriginal ValueComments
Hardness, Brinell 200Annealed bar.
 110
@Temperature 870 °C		Annealed bar.
 143
@Temperature 760 °C		Annealed bar.
 144
@Temperature 650 °C		Annealed bar.
 145
@Temperature 540 °C		Annealed bar.
 148
@Temperature 425 °C		Annealed bar.
 155
@Temperature 315 °C		Annealed bar.
 168
@Temperature 205 °C		Annealed bar.
 187
@Temperature 95.0 °C		Annealed bar.
Hardness, Knoop 222Converted from Brinell
 128
@Temperature 870 °C		Converted from Brinell
 163
@Temperature 760 °C		Converted from Brinell
 164
@Temperature 650 °C		Converted from Brinell
 165
@Temperature 540 °C		Converted from Brinell
 168
@Temperature 425 °C		Converted from Brinell
 175
@Temperature 315 °C		Converted from Brinell
 189
@Temperature 205 °C		Converted from Brinell
 209
@Temperature 95.0 °C		Converted from Brinell
Hardness, Rockwell B 92Converted from Brinell
 63
@Temperature 870 °C		Converted from Brinell
 78
@Temperature 540 °C		Converted from Brinell
 78
@Temperature 650 °C		Converted from Brinell
 78
@Temperature 760 °C		Converted from Brinell
 79
@Temperature 425 °C		Converted from Brinell
 82
@Temperature 315 °C		Converted from Brinell
 85
@Temperature 205 °C		Converted from Brinell
 90
@Temperature 95.0 °C		Converted from Brinell
Hardness, Vickers 210Converted from Brinell
 114
@Temperature 870 °C		Converted from Brinell
 149
@Temperature 760 °C		Converted from Brinell
 150
@Temperature 650 °C		Converted from Brinell
 151
@Temperature 540 °C		Converted from Brinell
 154
@Temperature 425 °C		Converted from Brinell
 162
@Temperature 315 °C		Converted from Brinell
 176
@Temperature 205 °C		Converted from Brinell
 196
@Temperature 95.0 °C		Converted from Brinell
Tensile Strength, Ultimate 734 MPaAnnealed bar.
 754 MPa
 208 MPa
@Temperature 870 °C		Annealed bar.
 255 MPa
@Temperature 815 °C		Annealed bar.
 343 MPa
@Temperature 760 °C		Annealed bar.
 407 MPa
@Temperature 705 °C		Annealed bar.
 459 MPa
@Temperature 650 °C		Annealed bar.
 494 MPa
@Temperature 595 °C		Annealed bar.
 520 MPa
@Temperature 540 °C		Annealed bar.
 532 MPa
@Temperature 480 °C		Annealed bar.
 540 MPa
@Temperature 425 °C		Annealed bar.
 548 MPa
@Temperature 370 °C		Annealed bar.
 555 MPa
@Temperature 315 °C		Annealed bar.
 566 MPa
@Temperature 260 °C		Annealed bar.
 582 MPa
@Temperature 205 °C		Annealed bar.
 620 MPa
@Temperature 150 °C		Annealed bar.
 640 MPa
@Temperature 95.0 °C		Annealed bar.
 883 MPa
@Temperature -18.0 °C
 1023 MPa
@Temperature -73.0 °C
 1156 MPa
@Temperature -130 °C
 1405 MPa
@Temperature -255 °C
 1502 MPa
@Temperature -195 °C
Tensile Strength, Yield 390 MPa
@Strain 0.2 %		Annealed bar
 401 MPa
@Strain 0.2 %
 113 MPa
@Strain 0.2 %,
Temperature 870 °C		Annealed bar
 164 MPa
@Strain 0.2 %,
Temperature 815 °C		Annealed bar
 174 MPa
@Strain 0.2 %,
Temperature 760 °C		Annealed bar
 189 MPa
@Strain 0.2 %,
Temperature 705 °C		Annealed bar
 193 MPa
@Strain 0.2 %,
Temperature 540 °C		Annealed bar
 194 MPa
@Strain 0.2 %,
Temperature 650 °C		Annealed bar
 195 MPa
@Strain 0.2 %,
Temperature 480 °C		Annealed bar
 198 MPa
@Strain 0.2 %,
Temperature 595 °C		Annealed bar
 200 MPa
@Strain 0.2 %,
Temperature 425 °C		Annealed bar
 201 MPa
@Strain 0.2 %,
Temperature 370 °C		Annealed bar
 205 MPa
@Strain 0.2 %,
Temperature 315 °C		Annealed bar
 221 MPa
@Strain 0.2 %,
Temperature 260 °C		Annealed bar
 226 MPa
@Strain 0.2 %,
Temperature 205 °C		Annealed bar
 261 MPa
@Strain 0.2 %,
Temperature 150 °C		Annealed bar
 306 MPa
@Strain 0.2 %,
Temperature 95.0 °C		Annealed bar
 464 MPa
@Strain 0.2 %,
Temperature -18.0 °C
 537 MPa
@Strain 0.2 %,
Temperature -73.0 °C
 603 MPa
@Strain 0.2 %,
Temperature -130 °C
 699 MPa
@Strain 0.2 %,
Temperature -195 °C
 864 MPa
@Strain 0.2 %,
Temperature -255 °C
Elongation at Break 61.7 %Annealed bar. Gage length is 4 times diameter.
 66.4 %in 25 mm
 23.5 %
@Temperature -255 °C		in 25 mm
 41.4 %
@Temperature 705 °C		Annealed bar. Gage length is 4 times diameter.
 47.1 %
@Temperature 760 °C		Annealed bar. Gage length is 4 times diameter.
 48.2 %
@Temperature 650 °C		Annealed bar. Gage length is 4 times diameter.
 48.7 %
@Temperature 595 °C		Annealed bar. Gage length is 4 times diameter.
 52.2 %
@Temperature 540 °C		Annealed bar. Gage length is 4 times diameter.
 53.9 %
@Temperature 480 °C		Annealed bar. Gage length is 4 times diameter.
 56.5 %
@Temperature 425 °C		Annealed bar. Gage length is 4 times diameter.
 59.1 %
@Temperature 370 °C		Annealed bar. Gage length is 4 times diameter.
 59.5 %
@Temperature -195 °C		in 25 mm
 59.6 %
@Temperature 315 °C		Annealed bar. Gage length is 4 times diameter.
 61.5 %
@Temperature 260 °C		Annealed bar. Gage length is 4 times diameter.
 62.4 %
@Temperature -130 °C		in 25 mm
 63.3 %
@Temperature 95.0 °C		Annealed bar. Gage length is 4 times diameter.
 64 %
@Temperature 205 °C		Annealed bar. Gage length is 4 times diameter.
 64.4 %
@Temperature 150 °C		Annealed bar. Gage length is 4 times diameter.
 70.5 %
@Temperature -73.0 °C		in 25 mm
 71.3 %
@Temperature -18.0 °C		in 25 mm
 72.8 %
@Temperature 815 °C		Annealed bar. Gage length is 4 times diameter.
 72.8 %
@Temperature 870 °C		Annealed bar. Gage length is 4 times diameter.
Modulus of Elasticity 180 GPa
Machinability 23 %Based on 100% machinability for AISI 1212 steel.
Charpy Impact 313 J
 187 J
@Temperature -195 °C
 230 J
@Temperature -130 °C
 267 J
@Temperature -73.0 °C
 293 J
@Temperature -18.0 °C
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.0000982 ohm-cm
@Temperature 23.0 °C
Magnetic Permeability <= 1.02annealed
 <= 1.02cold reduction of 10-40%
 <= 1.05cold reduction of 50-70%
 
Thermal PropertiesOriginal ValueComments
CTE, linear 15.8 µm/m-°C
@Temperature 25.0 - 95.0 °C
 16.6 µm/m-°C
@Temperature 205 °C
 17.3 µm/m-°C
@Temperature 25.0 - 315 °C
 17.6 µm/m-°C
@Temperature 425 °C
 18.0 µm/m-°C
@Temperature 25.0 - 540 °C
 18.5 µm/m-°C
@Temperature 25.0 - 650 °C
 18.9 µm/m-°C
@Temperature 25.0 - 760 °C
 19.3 µm/m-°C
@Temperature 25.0 - 870 °C
 19.8 µm/m-°C
@Temperature 25.0 - 980 °C
Specific Heat Capacity 0.480 J/g-°CTypical value for stainless steel.
Thermal Conductivity 20.7 W/m-KTypical value for stainless steel.
 
Component Elements PropertiesOriginal ValueComments
Carbon, C <= 0.10 %
Chromium, Cr 16 - 18 %
Iron, Fe 59.15 - 65.42 %As Balance
Manganese, Mn 7.0 - 9.0 %
Nickel, Ni 8.0 - 9.0 %
Nitrogen, N 0.080 - 0.18 %
Phosphorus, P <= 0.040 %
Silicon, Si 3.5 - 4.5 %
Sulfur, S <= 0.030 %

References for this datasheet.

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