S151 / S151D (Jethete M152 / MSRR 6503) , UNS S64152

Jethete M152 is a high-strength, creep and corrosion-resistant stainless steel, hardened and tempered for service up to 560°C. Its exceptional toughness and creep rupture strength make it ideal for highly stressed aerospace components, including turbine blades, discs, fasteners (bolts/screws), and rings.

Standard Grade UNS EN (EU) Werkstoff Nr.
AMS AMS 5719 S64152 - -
MSRR MSRR 6503 - - -
DIN 1.4939 - X12CrNiMo12 1.4939
TLV 1.4938 - X12CrNiMoV12-3 1.4938
BS BS S151 / S151D - - -
French AFNOR Z12CN12-02 - - -

What is S151 / S151D (Jethete M152 / MSRR 6503) , UNS S64152?

S151 / S151D (Jethete M152 / MSRR 6503) Stainless Steel

BS S151 (Jethete M152) is a high-performance precipitation-hardening stainless steel designed for aerospace applications. It offers exceptional creep resistance, corrosion resistance, and mechanical strength at elevated temperatures (up to 560°C). Commonly used in turbine blades, discs, and fasteners.

Applications

  • Turbine blades & discs
  • High-stress bolts (AMS 5719)
  • Aerospace fasteners (MSRR 6503)
  • Exhaust systems (up to 560°C)

Chemical Composition (%)

Element Min (%) Max (%) Typical (%)
C - 0.12 0.08
Cr 11.0 13.0 12.0
Ni 2.0 3.0 2.5
Mo 1.0 2.0 1.5
Mn - 1.0 0.5
Si - 1.0 0.3
P - 0.04 0.02
S - 0.03 0.01
Fe Balance ~82.0

Material Properties

Room Temperature Properties (Tempered Condition - BS S151D)

Property Value (Typical) Test Standard
Tensile Strength (UTS) 850-1000 MPa ASTM E8
Yield Strength (0.2%) 700-850 MPa ASTM E8
Elongation (% in 50mm) 15-20% ASTM E8
Hardness (HRC) 28-35 ASTM E18
Impact Toughness (Charpy) 50-70 J ASTM E23

Elevated Temperature Properties

Temperature (°C) Creep Rupture Strength (1000h, MPa) Oxidation Resistance
500 300 Excellent
560 200 Good
600 120 Limited

Physical Properties

Property Value
Density (g/cm³) 7.8
Melting Range (°C) 1400-1450
Thermal Conductivity (W/m·K @ 20°C) 15.0
Electrical Resistivity (Ω·m) 0.75 × 10⁻⁶
Magnetic Permeability Austenitic (Non-magnetic)

Heat Treatment

  • Softening (BS S151A): 670-720°C × 6h, air cool
  • Hardening: 1050°C ±10°C, air cool
  • Tempering (BS S151D): 650°C ±5°C, air cool

Processing Performance

  • Machinability: 60% of AISI 304 (use carbide tools, low speeds)
  • Welding: TIG/MIG possible with matching filler (post-weld heat treatment required)
  • Forging: 1050-900°C (avoid <850°C to prevent cracking)
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