31CrMoV9 Nitriding Alloy Steel Rod Diameter 10 - 320mm Custom Cutting For Industrial

31CrMoV9 Nitriding Alloy Steel Rod Diameter 10 - 320mm Custom Cutting for Industrial Applications

Products Specification

38CrMoAlA Nitriding Alloy Steel - Technical Product Specification

Material Classification:

• Premium Nitriding Steel Grade (Aluminum-Containing Alloy Steel)
• Manufacturing Standard:
• GB/T 3077-2015 (Equivalent to ISO 683-3:2016)

Key Material Advantages:

• Exceptional nitride layer formation capability (Al-enhanced)

• Superior fatigue resistance and load-bearing capacity

• Optimized for precision machining in pre-treated condition

• Excellent dimensional stability post-nitriding

Enhanced Metallurgical Properties:

• Controlled grain structure for improved fracture toughness

• Reduced residual stresses through specialized heat treatment

• Uniform hardness penetration characteristics

Chemical Composition (Optimized Analysis):

*Note: Vanadium content controlled for enhanced grain refinement

Advanced Mechanical Characteristics:

• Core Properties (QT Condition):

  • Tensile Strength: 1000-1150 MPa

  • Yield Strength (0.2% offset): 850-950 MPa

  • Reduction of Area: ≥45%

  • Charpy Impact (20°C): 70-90 J

• Surface Properties (After Nitriding):

  • White Layer Control: ≤25μm

  • Effective Case Depth (550HV): 0.4-0.7mm

  • Surface Hardness Range: 950-1200HV

  • Residual Stress Profile: Compressive (-800 to -1200MPa)

Special Processing Capabilities:

1. Precision Machining Grade:

   • Annealed hardness: 207-241 HB

   • Superior chip-breaking characteristics

   • Recommended cutting speeds: 80-120 m/min (carbide tools)

2. Controlled Distortion Heat Treatment:

   • Stress-relieving protocols available

   • Cryogenic treatment options (-196°C)

3. Surface Engineering Options:

   • Plasma nitriding

   • Low-temperature ion nitriding (≤480°C)

   • Composite coatings (TiN/DLC over nitride layer)

Quality Assurance Protocols:

• 100% ultrasonic testing (ASTM A388 Class B)

• Hydrogen content control (<2ppm)

• Microcleanliness: ASTM E45 Method A, ≤2.0 total inclusions

• Straightness tolerance: 0.5mm/m

Global Technical Equivalents:

Premium Applications:

• High-speed spindle components (CNC machining centers)

• Fuel injection systems (marine/aviation)

• Precision gear trains (robotics/space mechanisms)

• Semiconductor processing equipment

Supply Specifications:

• Diameter range: 12mm to 400mm

• Lengths: 3-6m standard, custom cuts available

• Surface: Peeled/Turned/Precision Ground (+/-0.05mm)

• Packaging: VCI-coated, wooden crates

Technical Support Services:

• Material selection consultation

• Failure analysis available

• Custom heat treatment development

• Application engineering support