1.4882, X50CrMnNiNbN21-9

X50CrMnNiNbN21-9, also designated as 1.4882, is a high-strength, nitrogen-strengthened austenitic stainless steel developed primarily for use in steam turbine blades and other high-temperature mechanical components. It combines good oxidation resistance, high creep rupture strength, and excellent fatigue performance with superior machinability and weldability. This material belongs to the group of heat-resistant austenitic steels stabilized with niobium and alloyed with nitrogen to enhance its mechanical endurance at elevated temperatures.

1.4882, X50CrMnNiNbN21-9

What is 1.4882, X50CrMnNiNbN21-9?

X50CrMnNiNbN21-9 (1.4882) is a robust austenitic stainless steel tailored for high-temperature applications requiring excellent mechanical strength, creep resistance, and oxidation stability. Its well-balanced chemical composition and favorable fabrication characteristics make it a preferred choice for components like turbine blades and engine valves.

Applications

  • Steam and gas turbine blades
  • Valves for internal combustion engines
  • High-temperature fasteners and components
  • Heat exchangers and reactor parts
  • Industrial furnaces and boiler internals

International Material Equivalents

Country/Region Equivalent/Similar Grade Standard Remarks
Germany X50CrMnNiNbN21-9 DIN EN 10088 / DIN 17243 Official designation
USA A286 (UNS S66286) ASTM A453, A638 Closest equivalent in high-temp austenitic steels
Russia ЭП718 (EP718) GOST 5632 High-strength, creep-resistant austenitic steel
France Z6CND21-09N AFNOR NF A 35-572 Similar chemistry and applications
UK BS 3076 NA16 BS EN 10095 Work-hardening austenitic grade
Japan SUS XM15J1 or SUS660 JIS G4303 Comparable creep resistance

Chemical Composition (%)

Element Min (%) Max (%)
C 0.45 0.55
Si — 0.45
Mn 8.00 10.00
P — 0.045
S — 0.030
Cr 20.00 22.00
Ni 3.50 5.50
N 0.40 0.60
W 0.80 1.50
Nb+Ta 1.80 2.50
Element 1.4882 A286 (S66286) ЭП718 XM15J1
C ≤0.10 ≤0.08 ≤0.10 ≤0.10
Mn 5.0–7.0 ≤1.0 ≤1.0 5.0–8.0
Cr 20.0–22.5 13.5–16.0 19–22 20–23
Ni 8.5–10.5 24–27 18–25 8–10
Nb 0.5–1.5 0.5–1.5 0.3–1.0 0.5–1.0
N 0.15–0.30 — ~0.1 0.15–0.3
Si ≤0.5 ≤1.0 ≤0.8 ≤0.8
S, P ≤0.025 ≤0.03 ≤0.03 ≤0.03

Material Properties

Condition Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HBW)
Controlled Cooling ≈1300 — — ≈385
Quenched (1000–1100°C) ≤1300 — — ≤385
+AT +P (d ≤ 40mm) 950–1150 ≥580 ≥12 HRC ≥30

Note: +AT = Solution Annealed, +P = Precipitation Hardened

Property +A (Annealed) +QT (Quenched & Tempered) +HT (Solution + Aging)
Yield Strength (Rp0.2), MPa ≥350 ≥620 ≥750
Tensile Strength, MPa ≥750 850–1100 ≥1000
Elongation A5, % ≥35 ≥20 ≥15
Impact Toughness, J (20 °C) ≥100 ≥60 ≥50
Hardness (HB) ≤260 280–320 300–340

High-Temperature Mechanical Properties

Temperature (°C) Tensile Strength (MPa) 0.2% Proof Strength (MPa)
500 680 350
550 650 330
600 610 310
650 550 285
700 480 260
750 410 240
800 340 220

Creep Strength

Temperature (°C) Creep Strength after 1000h (MPa)
500 220
650 120
725 55

Physical Properties

Property Value
Density (g/cm³) 7.8
Elastic Modulus (GPa) 205
Thermal Expansion (10⁻⁶/K) 15.5–18.8 (20–700°C)
Thermal Conductivity (W/m·K) 14.5
Specific Heat Capacity (J/kg·K) 500
Magnetic Properties Non-magnetic

Note: Austenitic steels may exhibit slight magnetism after aging or cold working.

Heat Treatment

Process Temperature (°C) Cooling Medium
Hot Forming 1150 to 950 —
Solution Annealing 1160 to 1200 Water
Aging 760 to 815 (4–8h) Air

Processing Performance

  • Machinability: Moderate; requires appropriate tooling and parameters.
  • Forming: Hot forming is preferred due to high strength.
  • Welding: Good weldability; standard austenitic fillers recommended. Post-weld heat treatment may be necessary to relieve stresses.
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