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Rulon Bearings

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 PropertiesMetricEnglishComments
Density 7.61 g/cc0.275 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 200200Annealed bar.
 110
@Temperature 870 °C		110
@Temperature 1600 °F		Annealed bar.
 143
@Temperature 760 °C		143
@Temperature 1400 °F		Annealed bar.
 144
@Temperature 650 °C		144
@Temperature 1200 °F		Annealed bar.
 145
@Temperature 540 °C		145
@Temperature 1000 °F		Annealed bar.
 148
@Temperature 425 °C		148
@Temperature 797 °F		Annealed bar.
 155
@Temperature 315 °C		155
@Temperature 599 °F		Annealed bar.
 168
@Temperature 205 °C		168
@Temperature 401 °F		Annealed bar.
 187
@Temperature 95.0 °C		187
@Temperature 203 °F		Annealed bar.
Hardness, Knoop 222222Converted from Brinell
 128
@Temperature 870 °C		128
@Temperature 1600 °F		Converted from Brinell
 163
@Temperature 760 °C		163
@Temperature 1400 °F		Converted from Brinell
 164
@Temperature 650 °C		164
@Temperature 1200 °F		Converted from Brinell
 165
@Temperature 540 °C		165
@Temperature 1000 °F		Converted from Brinell
 168
@Temperature 425 °C		168
@Temperature 797 °F		Converted from Brinell
 175
@Temperature 315 °C		175
@Temperature 599 °F		Converted from Brinell
 189
@Temperature 205 °C		189
@Temperature 401 °F		Converted from Brinell
 209
@Temperature 95.0 °C		209
@Temperature 203 °F		Converted from Brinell
Hardness, Rockwell B 9292Converted from Brinell
 63
@Temperature 870 °C		63
@Temperature 1600 °F		Converted from Brinell
 78
@Temperature 540 °C		78
@Temperature 1000 °F		Converted from Brinell
 78
@Temperature 650 °C		78
@Temperature 1200 °F		Converted from Brinell
 78
@Temperature 760 °C		78
@Temperature 1400 °F		Converted from Brinell
 79
@Temperature 425 °C		79
@Temperature 797 °F		Converted from Brinell
 82
@Temperature 315 °C		82
@Temperature 599 °F		Converted from Brinell
 85
@Temperature 205 °C		85
@Temperature 401 °F		Converted from Brinell
 90
@Temperature 95.0 °C		90
@Temperature 203 °F		Converted from Brinell
Hardness, Vickers 210210Converted from Brinell
 114
@Temperature 870 °C		114
@Temperature 1600 °F		Converted from Brinell
 149
@Temperature 760 °C		149
@Temperature 1400 °F		Converted from Brinell
 150
@Temperature 650 °C		150
@Temperature 1200 °F		Converted from Brinell
 151
@Temperature 540 °C		151
@Temperature 1000 °F		Converted from Brinell
 154
@Temperature 425 °C		154
@Temperature 797 °F		Converted from Brinell
 162
@Temperature 315 °C		162
@Temperature 599 °F		Converted from Brinell
 176
@Temperature 205 °C		176
@Temperature 401 °F		Converted from Brinell
 196
@Temperature 95.0 °C		196
@Temperature 203 °F		Converted from Brinell
Tensile Strength, Ultimate 734 MPa106000 psiAnnealed bar.
 754 MPa109000 psi
 208 MPa
@Temperature 870 °C		30200 psi
@Temperature 1600 °F		Annealed bar.
 255 MPa
@Temperature 815 °C		37000 psi
@Temperature 1500 °F		Annealed bar.
 343 MPa
@Temperature 760 °C		49700 psi
@Temperature 1400 °F		Annealed bar.
 407 MPa
@Temperature 705 °C		59000 psi
@Temperature 1300 °F		Annealed bar.
 459 MPa
@Temperature 650 °C		66600 psi
@Temperature 1200 °F		Annealed bar.
 494 MPa
@Temperature 595 °C		71600 psi
@Temperature 1100 °F		Annealed bar.
 520 MPa
@Temperature 540 °C		75400 psi
@Temperature 1000 °F		Annealed bar.
 532 MPa
@Temperature 480 °C		77200 psi
@Temperature 896 °F		Annealed bar.
 540 MPa
@Temperature 425 °C		78300 psi
@Temperature 797 °F		Annealed bar.
 548 MPa
@Temperature 370 °C		79500 psi
@Temperature 698 °F		Annealed bar.
 555 MPa
@Temperature 315 °C		80500 psi
@Temperature 599 °F		Annealed bar.
 566 MPa
@Temperature 260 °C		82100 psi
@Temperature 500 °F		Annealed bar.
 582 MPa
@Temperature 205 °C		84400 psi
@Temperature 401 °F		Annealed bar.
 620 MPa
@Temperature 150 °C		89900 psi
@Temperature 302 °F		Annealed bar.
 640 MPa
@Temperature 95.0 °C		92800 psi
@Temperature 203 °F		Annealed bar.
 883 MPa
@Temperature -18.0 °C		128000 psi
@Temperature -0.400 °F
 1023 MPa
@Temperature -73.0 °C		148400 psi
@Temperature -99.4 °F
 1156 MPa
@Temperature -130 °C		167700 psi
@Temperature -202 °F
 1405 MPa
@Temperature -255 °C		203800 psi
@Temperature -427 °F
 1502 MPa
@Temperature -195 °C		217800 psi
@Temperature -319 °F
Tensile Strength, Yield  390 MPa
@Strain 0.2 %		56600 psi
@Strain 0.2 %		Annealed bar
 401 MPa
@Strain 0.2 %		58200 psi
@Strain 0.2 %
 113 MPa
@Strain 0.2 %,
Temperature 870 °C		16400 psi
@Strain 0.2 %,
Temperature 1600 °F		Annealed bar
 164 MPa
@Strain 0.2 %,
Temperature 815 °C		23800 psi
@Strain 0.2 %,
Temperature 1500 °F		Annealed bar
 174 MPa
@Strain 0.2 %,
Temperature 760 °C		25200 psi
@Strain 0.2 %,
Temperature 1400 °F		Annealed bar
 189 MPa
@Strain 0.2 %,
Temperature 705 °C		27400 psi
@Strain 0.2 %,
Temperature 1300 °F		Annealed bar
 193 MPa
@Strain 0.2 %,
Temperature 540 °C		28000 psi
@Strain 0.2 %,
Temperature 1000 °F		Annealed bar
 194 MPa
@Strain 0.2 %,
Temperature 650 °C		28100 psi
@Strain 0.2 %,
Temperature 1200 °F		Annealed bar
 195 MPa
@Strain 0.2 %,
Temperature 480 °C		28300 psi
@Strain 0.2 %,
Temperature 896 °F		Annealed bar
 198 MPa
@Strain 0.2 %,
Temperature 595 °C		28700 psi
@Strain 0.2 %,
Temperature 1100 °F		Annealed bar
 200 MPa
@Strain 0.2 %,
Temperature 425 °C		29000 psi
@Strain 0.2 %,
Temperature 797 °F		Annealed bar
 201 MPa
@Strain 0.2 %,
Temperature 370 °C		29200 psi
@Strain 0.2 %,
Temperature 698 °F		Annealed bar
 205 MPa
@Strain 0.2 %,
Temperature 315 °C		29700 psi
@Strain 0.2 %,
Temperature 599 °F		Annealed bar
 221 MPa
@Strain 0.2 %,
Temperature 260 °C		32100 psi
@Strain 0.2 %,
Temperature 500 °F		Annealed bar
 226 MPa
@Strain 0.2 %,
Temperature 205 °C		32800 psi
@Strain 0.2 %,
Temperature 401 °F		Annealed bar
 261 MPa
@Strain 0.2 %,
Temperature 150 °C		37900 psi
@Strain 0.2 %,
Temperature 302 °F		Annealed bar
 306 MPa
@Strain 0.2 %,
Temperature 95.0 °C		44400 psi
@Strain 0.2 %,
Temperature 203 °F		Annealed bar
 464 MPa
@Strain 0.2 %,
Temperature -18.0 °C		67300 psi
@Strain 0.2 %,
Temperature -0.400 °F
 537 MPa
@Strain 0.2 %,
Temperature -73.0 °C		77900 psi
@Strain 0.2 %,
Temperature -99.4 °F
 603 MPa
@Strain 0.2 %,
Temperature -130 °C		87500 psi
@Strain 0.2 %,
Temperature -202 °F
 699 MPa
@Strain 0.2 %,
Temperature -195 °C		101000 psi
@Strain 0.2 %,
Temperature -319 °F
 864 MPa
@Strain 0.2 %,
Temperature -255 °C		125000 psi
@Strain 0.2 %,
Temperature -427 °F
Elongation at Break 61.7 %61.7 %Annealed bar. Gage length is 4 times diameter.
 66.4 %66.4 %in 25 mm
 23.5 %
@Temperature -255 °C		23.5 %
@Temperature -427 °F		in 25 mm
 41.4 %
@Temperature 705 °C		41.4 %
@Temperature 1300 °F		Annealed bar. Gage length is 4 times diameter.
 47.1 %
@Temperature 760 °C		47.1 %
@Temperature 1400 °F		Annealed bar. Gage length is 4 times diameter.
 48.2 %
@Temperature 650 °C		48.2 %
@Temperature 1200 °F		Annealed bar. Gage length is 4 times diameter.
 48.7 %
@Temperature 595 °C		48.7 %
@Temperature 1100 °F		Annealed bar. Gage length is 4 times diameter.
 52.2 %
@Temperature 540 °C		52.2 %
@Temperature 1000 °F		Annealed bar. Gage length is 4 times diameter.
 53.9 %
@Temperature 480 °C		53.9 %
@Temperature 896 °F		Annealed bar. Gage length is 4 times diameter.
 56.5 %
@Temperature 425 °C		56.5 %
@Temperature 797 °F		Annealed bar. Gage length is 4 times diameter.
 59.1 %
@Temperature 370 °C		59.1 %
@Temperature 698 °F		Annealed bar. Gage length is 4 times diameter.
 59.5 %
@Temperature -195 °C		59.5 %
@Temperature -319 °F		in 25 mm
 59.6 %
@Temperature 315 °C		59.6 %
@Temperature 599 °F		Annealed bar. Gage length is 4 times diameter.
 61.5 %
@Temperature 260 °C		61.5 %
@Temperature 500 °F		Annealed bar. Gage length is 4 times diameter.
 62.4 %
@Temperature -130 °C		62.4 %
@Temperature -202 °F		in 25 mm
 63.3 %
@Temperature 95.0 °C		63.3 %
@Temperature 203 °F		Annealed bar. Gage length is 4 times diameter.
 64 %
@Temperature 205 °C		64 %
@Temperature 401 °F		Annealed bar. Gage length is 4 times diameter.
 64.4 %
@Temperature 150 °C		64.4 %
@Temperature 302 °F		Annealed bar. Gage length is 4 times diameter.
 70.5 %
@Temperature -73.0 °C		70.5 %
@Temperature -99.4 °F		in 25 mm
 71.3 %
@Temperature -18.0 °C		71.3 %
@Temperature -0.400 °F		in 25 mm
 72.8 %
@Temperature 815 °C		72.8 %
@Temperature 1500 °F		Annealed bar. Gage length is 4 times diameter.
 72.8 %
@Temperature 870 °C		72.8 %
@Temperature 1600 °F		Annealed bar. Gage length is 4 times diameter.
Modulus of Elasticity 180 GPa26100 ksi
Machinability 23 %23 %Based on 100% machinability for AISI 1212 steel.
Charpy Impact 313 J231 ft-lb
 187 J
@Temperature -195 °C		138 ft-lb
@Temperature -319 °F
 230 J
@Temperature -130 °C		170 ft-lb
@Temperature -202 °F
 267 J
@Temperature -73.0 °C		197 ft-lb
@Temperature -99.4 °F
 293 J
@Temperature -18.0 °C		216 ft-lb
@Temperature -0.400 °F
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000982 ohm-cm
@Temperature 23.0 °C		0.0000982 ohm-cm
@Temperature 73.4 °F
Magnetic Permeability <= 1.02<= 1.02annealed
 <= 1.02<= 1.02cold reduction of 10-40%
 <= 1.05<= 1.05cold reduction of 50-70%
 
Thermal PropertiesMetricEnglishComments
CTE, linear  15.8 µm/m-°C
@Temperature 25.0 - 95.0 °C		8.78 µin/in-°F
@Temperature 77.0 - 203 °F
 16.6 µm/m-°C
@Temperature 205 °C		9.22 µin/in-°F
@Temperature 401 °F
 17.3 µm/m-°C
@Temperature 25.0 - 315 °C		9.61 µin/in-°F
@Temperature 77.0 - 599 °F
 17.6 µm/m-°C
@Temperature 425 °C		9.78 µin/in-°F
@Temperature 797 °F
 18.0 µm/m-°C
@Temperature 25.0 - 540 °C		10.0 µin/in-°F
@Temperature 77.0 - 1000 °F
 18.5 µm/m-°C
@Temperature 25.0 - 650 °C		10.3 µin/in-°F
@Temperature 77.0 - 1200 °F
 18.9 µm/m-°C
@Temperature 25.0 - 760 °C		10.5 µin/in-°F
@Temperature 77.0 - 1400 °F
 19.3 µm/m-°C
@Temperature 25.0 - 870 °C		10.7 µin/in-°F
@Temperature 77.0 - 1600 °F
 19.8 µm/m-°C
@Temperature 25.0 - 980 °C		11.0 µin/in-°F
@Temperature 77.0 - 1800 °F
Specific Heat Capacity 0.480 J/g-°C0.115 BTU/lb-°FTypical value for stainless steel.
Thermal Conductivity 20.7 W/m-K144 BTU-in/hr-ft²-°FTypical value for stainless steel.
 
Component Elements PropertiesMetricEnglishComments
Carbon, C <= 0.10 %<= 0.10 %
Chromium, Cr 16 - 18 %16 - 18 %
Iron, Fe 59.15 - 65.42 %59.15 - 65.42 %As Balance
Manganese, Mn 7.0 - 9.0 %7.0 - 9.0 %
Nickel, Ni 8.0 - 9.0 %8.0 - 9.0 %
Nitrogen, N 0.080 - 0.18 %0.080 - 0.18 %
Phosphorus, P <= 0.040 %<= 0.040 %
Silicon, Si 3.5 - 4.5 %3.5 - 4.5 %
Sulfur, S <= 0.030 %<= 0.030 %

References for this datasheet.

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