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AK Steel NITRONIC® 19-D Duplex Stainless Steel
Categories: Metal; Ferrous Metal; Stainless Steel
Material Notes: AK Steel NITRONIC® 19D is a stainless steel with a mixed ferrite and austenite structure. This alloy provides high yield strength (65 ksi minimum {448 MPa}), good drawing and welding characteristics, excellent chloride stress corrosion cracking resistance, and high cyclic oxidation resistance up to 1800°F (982°C). It also exhibits high ductility (super plasticity) at high temperatures (1800°F {982°C}). Compared to similar duplex stainless alloys such as 2205, NITRONIC 19D Stainless Steel is more economical but less corrosion resistant due to lower alloy content (particularly molybdenum). Inclusion in ASTM A 240 has been granted and the alloy is listed in the A 240-97a publication dated March 1998.

Information provided by AK Steel
Key Words: UNS S32001, ASTM A240
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Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell B 91.591.50% Cold Work
 93 - 9893 - 98Typical, (Gauge, 0.028" -0.084")
 97974.0% Cold Work
 99.599.59.8% Cold Work
Hardness, Rockwell C 242415.1% Cold Work
 26.526.520.7% Cold Work
 303040.7% Cold Work
 333357.8% Cold Work
Tensile Strength, Ultimate 681 MPa98800 psi0% Cold Work
 718 MPa104000 psi4% Cold Work
 782 MPa113000 psi9.8% Cold Work
 812 MPa118000 psi15.1% Cold Work
 689 - 993 MPa99900 - 144000 psiTypical, (Gauge, 0.028" -0.084")
 896 MPa130000 psi20.7% Cold Work
 1063 MPa154200 psi40.7% Cold Work
 1186 MPa172000 psi57.8% Cold Work
 17.9 MPa
@Temperature 1090 °C		2600 psi
@Temperature 2000 °F		Transverse
 17.9 MPa
@Temperature 1090 °C		2600 psi
@Temperature 2000 °F		Longitudinal
 27.6 MPa
@Temperature 982 °C		4000 psi
@Temperature 1800 °F		Transverse
 37.9 MPa
@Temperature 982 °C		5500 psi
@Temperature 1800 °F		Longitudinal
 69.6 MPa
@Temperature 871 °C		10100 psi
@Temperature 1600 °F		Transverse
 83.4 MPa
@Temperature 871 °C		12100 psi
@Temperature 1600 °F		Longitudinal
Tensile Strength, Yield  437 MPa
@Strain 0.2 %		63400 psi
@Strain 0.2 %		0% Cold Work
 604 MPa
@Strain 0.2 %		87600 psi
@Strain 0.2 %		4.0% Cold Work
 702 MPa
@Strain 0.2 %		102000 psi
@Strain 0.2 %		9.8% Cold Work
 785 MPa
@Strain 0.2 %		114000 psi
@Strain 0.2 %		15.1% Cold Work
 827 MPa
@Strain 0.2 %		120000 psi
@Strain 0.2 %		20.7% Cold Work
 974 MPa
@Strain 0.2 %		141000 psi
@Strain 0.2 %		40.7% Cold Work
 1090 MPa
@Strain 0.2 %		158000 psi
@Strain 0.2 %		57.8% Cold Work
 5.52 MPa
@Strain 0.2 %,
Temperature 1090 °C		800 psi
@Strain 0.2 %,
Temperature 2000 °F		Transverse
 8.96 MPa
@Strain 0.2 %,
Temperature 1090 °C		1300 psi
@Strain 0.2 %,
Temperature 2000 °F		Longitudinal
 15.9 MPa
@Strain 0.2 %,
Temperature 982 °C		2300 psi
@Strain 0.2 %,
Temperature 1800 °F		Transverse
 22.8 MPa
@Strain 0.2 %,
Temperature 982 °C		3300 psi
@Strain 0.2 %,
Temperature 1800 °F		Longitudinal
 47.6 MPa
@Strain 0.2 %,
Temperature 871 °C		6900 psi
@Strain 0.2 %,
Temperature 1600 °F		Transverse
 57.9 MPa
@Strain 0.2 %,
Temperature 871 °C		8400 psi
@Strain 0.2 %,
Temperature 1600 °F		Longitudinal
 476 - 538 MPa
@Strain 0.2 %,
Temperature 21.1 °C		69000 - 78000 psi
@Strain 0.2 %,
Temperature 70.0 °F
Elongation at Break 5.2 %5.2 %In 2", 40.7% Cold Work
 5.5 %5.5 %In 2", 57.8% Cold Work
 12.1 %12.1 %In 2", 20.7% Cold Work
 14.6 %14.6 %In 2", 15.1% Cold Work
 23.6 %23.6 %In 2", 9.8% Cold Work
 30.1 %30.1 %In 2", 4.0% Cold Work
 34.5 %34.5 %In 2", 0% Cold Work
 31 - 40 %
@Thickness 50.8 mm		31 - 40 %
@Thickness 2.00 in		Typical, (Gauge, 0.028" -0.084")
 82.3 %
@Thickness 50.8 mm,
Temperature 871 °C		82.3 %
@Thickness 2.00 in,
Temperature 1600 °F		in 2", Longitudinal
 88 %
@Thickness 50.8 mm,
Temperature 871 °C		88 %
@Thickness 2.00 in,
Temperature 1600 °F		in 2", Transverse
 113 %
@Thickness 50.8 mm,
Temperature 982 °C		113 %
@Thickness 2.00 in,
Temperature 1800 °F		in 2", Longitudinal
 143 %
@Thickness 50.8 mm,
Temperature 982 °C		143 %
@Thickness 2.00 in,
Temperature 1800 °F		in 2", Transverse
 179.5 %
@Thickness 50.8 mm,
Temperature 1090 °C		179.5 %
@Thickness 2.00 in,
Temperature 2000 °F		in 2", Transverse
 236.5 %
@Thickness 50.8 mm,
Temperature 1090 °C		236.5 %
@Thickness 2.00 in,
Temperature 2000 °F		in 2", Longitudinal
Reduction of Area  61.6 %
@Temperature 871 °C		61.6 %
@Temperature 1600 °F		Transverse
 65 %
@Temperature 871 °C		65 %
@Temperature 1600 °F		Longitudinal
 80 %
@Temperature 982 °C		80 %
@Temperature 1800 °F		Longitudinal
 80 %
@Temperature 982 °C		80 %
@Temperature 1800 °F		Transverse
 84.3 %
@Temperature 1090 °C		84.3 %
@Temperature 2000 °F		Longitudinal
 97 %
@Temperature 1090 °C		97 %
@Temperature 2000 °F		Transverse
Charpy Impact, Notched  15.0 J/cm²
@# of Cycles 2.00 ,
Temperature -101 °C		71.4 ft-lb/in²
@# of Cycles 2.00 ,
Temperature -150 °F		Transverse
 17.8 J/cm²
@# of Cycles 2.00 ,
Temperature -101 °C		84.7 ft-lb/in²
@# of Cycles 2.00 ,
Temperature -150 °F		Longitudinal
 38.9 J/cm²
@# of Cycles 2.00 ,
Temperature -73.3 °C		185 ft-lb/in²
@# of Cycles 2.00 ,
Temperature -100 °F		Transverse
 50.6 J/cm²
@# of Cycles 1.00 ,
Temperature -101 °C		241 ft-lb/in²
@# of Cycles 1.00 ,
Temperature -150 °F		Transverse
 54.4 J/cm²
@# of Cycles 1.00 ,
Temperature -73.3 °C		259 ft-lb/in²
@# of Cycles 1.00 ,
Temperature -100 °F		Transverse
 69.3 J/cm²
@# of Cycles 1.00 ,
Temperature -30.0 °C		330 ft-lb/in²
@# of Cycles 1.00 ,
Temperature -22.0 °F		Transverse
 77.5 J/cm²
@# of Cycles 1.00 ,
Temperature -17.8 °C		369 ft-lb/in²
@# of Cycles 1.00 ,
Temperature 0.000 °F		Transverse
 81.6 J/cm²
@# of Cycles 2.00 ,
Temperature -30.0 °C		388 ft-lb/in²
@# of Cycles 2.00 ,
Temperature -22.0 °F		Transverse
 83.9 J/cm²
@# of Cycles 1.00 ,
Temperature 22.8 °C		399 ft-lb/in²
@# of Cycles 1.00 ,
Temperature 73.0 °F		Transverse
 85.8 J/cm²
@# of Cycles 2.00 ,
Temperature -73.3 °C		408 ft-lb/in²
@# of Cycles 2.00 ,
Temperature -100 °F		Longitudinal
 89.5 J/cm²
@# of Cycles 2.00 ,
Temperature -17.8 °C		426 ft-lb/in²
@# of Cycles 2.00 ,
Temperature 0.000 °F		Transverse
 105.1 J/cm²
@# of Cycles 2.00 ,
Temperature 22.8 °C		500.2 ft-lb/in²
@# of Cycles 2.00 ,
Temperature 73.0 °F		Transverse
 111.1 J/cm²
@# of Cycles 1.00 ,
Temperature -101 °C		528.8 ft-lb/in²
@# of Cycles 1.00 ,
Temperature -150 °F		Longitudinal
 138.3 J/cm²
@# of Cycles 1.00 ,
Temperature -73.3 °C		658.2 ft-lb/in²
@# of Cycles 1.00 ,
Temperature -100 °F		Longitudinal
 144.9 J/cm²
@# of Cycles 2.00 ,
Temperature -30.0 °C		689.6 ft-lb/in²
@# of Cycles 2.00 ,
Temperature -22.0 °F		Longitudinal
 159.2 J/cm²
@# of Cycles 2.00 ,
Temperature -17.8 °C		757.7 ft-lb/in²
@# of Cycles 2.00 ,
Temperature 0.000 °F		Longitudinal
 169.8 J/cm²
@# of Cycles 1.00 ,
Temperature -30.0 °C		808.1 ft-lb/in²
@# of Cycles 1.00 ,
Temperature -22.0 °F		Longitudinal
 184.7 J/cm²
@# of Cycles 1.00 ,
Temperature -17.8 °C		879.0 ft-lb/in²
@# of Cycles 1.00 ,
Temperature 0.000 °F		Longitudinal
 271.9 J/cm²
@# of Cycles 2.00 ,
Temperature 22.8 °C		1294 ft-lb/in²
@# of Cycles 2.00 ,
Temperature 73.0 °F		Longitudinal
 293.8 J/cm²
@# of Cycles 1.00 ,
Temperature 22.8 °C		1398 ft-lb/in²
@# of Cycles 1.00 ,
Temperature 73.0 °F		Longitudinal
 
Thermal PropertiesMetricEnglishComments
CTE, linear  12.7 µm/m-°C
@Temperature 79.4 °C		7.04 µin/in-°F
@Temperature 175 °F
 13.1 µm/m-°C
@Temperature 135 °C		7.30 µin/in-°F
@Temperature 275 °F
 13.4 µm/m-°C
@Temperature 191 °C		7.46 µin/in-°F
@Temperature 375 °F
 13.7 µm/m-°C
@Temperature 246 °C		7.59 µin/in-°F
@Temperature 475 °F
 13.9 µm/m-°C
@Temperature 302 °C		7.72 µin/in-°F
@Temperature 575 °F
 14.1 µm/m-°C
@Temperature 357 °C		7.83 µin/in-°F
@Temperature 675 °F
 14.3 µm/m-°C
@Temperature 413 °C		7.93 µin/in-°F
@Temperature 775 °F
 14.4 µm/m-°C
@Temperature 468 °C		8.02 µin/in-°F
@Temperature 875 °F
 14.5 µm/m-°C
@Temperature 524 °C		8.08 µin/in-°F
@Temperature 975 °F
 14.7 µm/m-°C
@Temperature 579.4 °C		8.18 µin/in-°F
@Temperature 1075 °F
 14.9 µm/m-°C
@Temperature 635.0 °C		8.29 µin/in-°F
@Temperature 1175 °F
 15.0 µm/m-°C
@Temperature 655.94 °C		8.36 µin/in-°F
@Temperature 1212.7 °F
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.20 %0.20 %
Chromium, Cr 20 %20 %
Copper, Cu 0.30 %0.30 %
Iron, Fe 72.6 %72.6 %As Balance
Manganese, Mn 5.0 %5.0 %
Nickel, Ni 1.6 %1.6 %
Nitrogen, N 0.13 %0.13 %
Silicon, Si 0.40 %0.40 %
 
Descriptive Properties
Chloride Stress Cracking Resistance (hrs)720No failure
Cyclic Oxidation Resistance (mg/in221.91600°F, Total of 958 Cycles
 26.61800°F, Total of 670 Cycles
'n' Value0.164.0% Cold Work
 0.170% Cold Work
 0.19Strain Hardening Coefficient, Typical, (Gauge, 0.028" -0.084")
Olsen Cup Height0.330"-0.450"Typical, (Gauge, 0.028" -0.084")

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NAKS140 / 138555

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