Marine Alloy Steel Crankshaft Castings
Marine Diesel Engine Alloy Steel Crankshaft Castings
Product Overview
Specialized in manufacturing alloy steel crankshafts for low/medium/high-speed marine diesel engines, certified by major classification societies including CCS, DNV-GL and ABS.
Material Grades (Global Standards)
|
China GB |
ASTM |
EN |
JIS |
Characteristics |
|
ZG42CrMoA |
A148 80-50 |
1.7220 |
SCM440 |
Medium-speed |
|
ZG35CrNiMo |
A487 Gr.7 |
1.6747 |
SNC631 |
High fatigue |
|
ZG28CrMoNiV |
- |
1.6740 |
- |
Low-speed |
|
ZG40CrMnSiMo |
A757 Gr.A |
1.6230 |
- |
High-speed |
Technical Advantages
✔ Material Properties:
Tensile strength ≥850MPa
Impact toughness ≥50J@-20℃
Fatigue limit ≥400MPa (10⁷ cycles)
✔ Casting Processes:
Resin sand precision molding (CT6-8)
Solidification simulation
Directional solidification
✔ Heat Treatment:
Quenching & tempering
Journal surface hardening (HRC52-58)
Stress relieving (vibration + thermal)
Specifications
Engine power: 500-50000kW
Single throw weight: 0.2-8 tons
Total length: ≤12m
Balance: ≤0.05mm/m
Quality Control
Material Tests:
✓ OES analysis
✓ Sulfur print test
✓ Inclusion rating
NDT:
✓ 100% UT (EN 12680-3 Cl.1)
✓ MT (full journals inspection)
Mechanical Tests:
✓ Witness samples testing
✓ Hardness profile
Applications
✓ Ocean-going vessel 2-stroke engines
✓ Coastal ship 4-stroke engines
✓ Naval high-speed diesels
✓ Offshore platform auxiliaries
Certifications
▸ Classification Society Approvals:
CCS, DNV-GL, ABS, LR, BV
▸ Material Certificates:
EN 10204 3.2
Marine Equipment Directive
Note:
Finite Element Analysis (FEA) available
Dynamic balancing service
Surface coating options (nitriding/peening)
Emergency repair solutions
FAQ
Q: What rollers do you supply for metallurgical applications?
Q: What are gas radiation tubes used for?
Q: What materials are used in your slide blocks and grate bars?
Q: Do you provide furnace grates and side plates?
Q: What's the typical lifespan of your metallurgical components?
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