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Elmet Technologies

AISI Type S21800 Stainless Steel, 50% cold reduction
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. Test specimens were 11.2 mm diameter at start.
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
Tensile Strength, Ultimate 1495 MPa216800 psi
Tensile Strength, Yield 1200 MPa
@Strain 0.2 %		174000 psi
@Strain 0.2 %
Elongation at Break 15 %15 %Gage length is 4 times diameter.
Modulus of Elasticity 180 GPa26100 ksi
Machinability 23 %23 %Based on 100% machinability for AISI 1212 steel.
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000982 ohm-cm
@Temperature 23.0 °C		0.0000982 ohm-cm
@Temperature 73.4 °F
Magnetic Permeability <= 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 stainless steel.
Thermal Conductivity 20.7 W/m-K144 BTU-in/hr-ft²-°FTypical 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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MQM21BA / 13624

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