13-8Mo / 1.4534

13-8Mo / 1.4534 – Precipitation-Hardening Stainless Steel

Key Features:
✔ High strength-to-weight ratio
✔ Excellent corrosion resistance
✔ Superior toughness at low temperatures
✔ Good fabricability and weldability
✔ Age-hardenable to various strength levels

Material Standards:

• AMS 5629

• ASTM A564 (Type XM-13)

• UNS S13800

• DIN 1.4534

• EN X3CrNiMoAl13-8-2

Chemical Composition (%)

Mechanical Properties

Solution Annealed Condition (Condition A):

• Tensile Strength: 950-1100 MPa

• Yield Strength: 550-750 MPa

• Elongation: 18-22%

• Hardness: 28-32 HRC

H950 Aged Condition:

• Tensile Strength: 1480-1650 MPa

• Yield Strength: 1380-1520 MPa

• Elongation: 10-12%

• Hardness: 43-47 HRC

H1000 Aged Condition:

• Tensile Strength: 1310-1450 MPa

• Yield Strength: 1170-1310 MPa

• Elongation: 12-15%

• Hardness: 38-42 HRC

Physical Properties

Heat Treatment

1. Solution Annealing:

   • 955-1010°C (1750-1850°F)

   • Rapid cooling (water quench preferred)

2. Aging Treatments:

   • H950: 510°C (950°F) for 4 hours

   • H1000: 540°C (1000°F) for 4 hours

   • H1150: 620°C (1150°F) for 4 hours

Corrosion Resistance

• Excellent resistance to:

  • Stress corrosion cracking

  • Pitting and crevice corrosion

  • General atmospheric corrosion

  • Saltwater environments

• Comparable to Type 304 in many environments

• Superior to 17-4PH in chloride environments

Fabrication Characteristics

Machining:

• Best performed in solution annealed condition

• Use positive rake angles and sharp tools

• Recommended speeds: 20-30 m/min for turning

Welding:

• All standard methods applicable (TIG, MIG, EB)

• Post-weld heat treatment recommended

• Matching filler metal: ER630

Forming:

• Good cold forming properties

• Anneal between severe forming operations

• Age after final forming

Applications

Aerospace:

• Aircraft fittings

• Fasteners

• Landing gear components

Oil & Gas:

• Valve components

• Downhole tools

• Subsea equipment

Medical:

• Surgical instruments

• Implantable devices

Industrial:

• High-strength fasteners

• Pump shafts

• Nuclear components

Forms of delivery