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UNS 21-4N Details

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21-4N Application:Engine poppet valve information report

Category Type Grade Microstructure Designations
Grades Stainless Steels 21-4N Precipitation-Hardening USA - UNS , SAE J 775 (2004) - Engine poppet valve information report

Chemical composition(wt.%) of 21-4N grade: SAE J 775 (2004)

Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.05
Si - 0.20
Mn - 0.50
P - -
S - -
Ni - remaining
Cr 15.00 17.00
Al 4.00 5.00
Cu - -
Ti - 0.50
Fe 2.00 4.00
N - -
Mo - 0.50
B - 0.006
Zr - 0.05
Engine poppet valve information report

Mechanical properties of grade 21-4N SAE J 775 (2004)

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
392 (≥) 681 (≥) 34 13 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 331

Physical properties of grade 21-4N SAE J 775 (2004)

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
961 (≥) 688 (≥) 43 42 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 441
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
755 686 763

21-4N - Form of Supply

Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED

Cross Reference Table(Equivalent Grade)

Grade Standard Country Application
XM-31 UNS USA
Chemical compositions of SAE wrought stainless steels
S21400 AISI USA
Chemical compositions of SAE wrought stainless steels
S21460 AISI USA
Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar
A 240 S21400 SAE USA
Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 580 S21400 SAE USA
Stainless Steel Wire
S21400 AISI USA
Austenitic Chromium Manganese Stainless Steel
SA-240 S21400 AMS USA
Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
21-4N UNS USA
Engine poppet valve information report
21-4N + Nb + W UNS USA
Engine poppet valve information report
A 214 SAE USA
Electric-Resistance-Welded Carbon Steel Heat-Exchanger and Condenser Tubes
A 240 S21400 SAE USA
Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 540 Grade B21 Class 4 SAE USA
Alloy-Steel Bolting Materials for Special Applications
A 580 S21400 SAE USA
Stainless Steel Wire
A 666 S21460 SAE USA
Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar
A 691 Grade 2 1/4 CR SAE USA
Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures
A 732 Grade 14Q SAE USA
Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
A92214 AISI USA
Wrought aluminum alloy, heat treatable
B 823 CZP-3002-14 SAE USA
Materials for Nonferrous Powder Metallurgy (P/M) Structural Parts
B 862 Grade 14 SAE USA
Titanium and Titanium Alloy Welded Pipe
F2146 R56320 SAE USA
Standard Specification for Wrought Titanium-3Aluminum-2.5Vanadium Alloy Seamless Tubing for Surgical Implant Applications (UNS R56320)

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