Wholesale High Quality Forging and Machining Steel Crankshaft for Engine Parts

Product Description

                  Wholesale High Quality Forging and Machining Steel Crankshaft for Engine Parts

Product Description

The crankshaft is the most important part of the engine. It bears the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine. The crankshaft is subjected to the combined action of centrifugal force of rotating mass, periodic gas inertia force and reciprocating inertia force, which makes the crankshaft bear the bending and torsional load. Therefore, the crankshaft is required to have sufficient strength and stiffness,

and the journal surface shall be wear-resistant, work evenly and have good balance.


       Material specification:
       1. Carbon & low alloy steel;
       2. Stainless steel;
       3. High alloy & wear resist steel;
       4. Gray iron; Ductile iron;
       5. Malleable iron;
       6. Alloyed cast iron;
       7. Aluminum alloy;
       8. Cooper alloy;
       9. Zinc alloy

       Specifications:
       1. ISO9001: 2015 certification
       2. TUV (PED 97/23/EC & AD2000 aa W0/TRD 100) certification
       3. Professional OEM manufacturer
       4. Process: Precision made. Experience & Reasonable QC that you can reply on Each part would be
       given 100% test and tryout before shipment. 5. Adequate supply capacity. Punctual delivery time.

The stress of crankshaft is extremely complex. It works under the joint action of periodically changing gas pressure, reciprocating inertia force and its torque, and bears huge alternating bending and torsion loads. At the same time, it is also a slender high-speed rotating part, so it needs strict dynamic balance, and bending and distortion are not allowed to exceed a certain value. Therefore, our crankshaft needs to be made of very high-quality materials and undergo strict surface treatment process. 45, 40Cr, 35Mn2 and other medium carbon steel and medium carbon alloy steel are generally used for die forging, and nodular cast iron is also used more in recent years. After forging or casting, in order to improve the fatigue strength of the crankshaft and eliminate stress concentration, shot peening shall be carried out on the journal surface, and the fillet shall be rolled; In order to improve the surface hardness of the journal, it is also necessary to do high-frequency quenching or nitriding treatment on the journal surface, and finally finish machining. The crankshaft treated in this way has sufficient fatigue strength and stiffness against bending and torsion, and the journal has large enough pressure bearing surface and wear resistance. It ensures the high hardness and accurate size control of the crankshaft. Enable users to have a good use feeling.

Features:custom forgings Crankshaft

1) Materials:  carbon steel, Alloy steel, stainless steel, aluminum, bronze, brass, etc. 

2) Standard: JIS, DIN, ASTM, BS

3 ) Surface treatment  :Electro Zinc Plating Hot deep zinc plating, Electrophoresis, Powder
coating, Painting ,Shoot blasting etc. 

4) Weight: 0.1 -10,000kg

5) Processes : Forging ,Sand Casting, Investment Casting, Precision Casting, CNC Machining. 

6) Manufacturing equipments: three die-forging product lines (3 ton stamp forging hammer product line, 1000 ton friction product line, 1250 ton press product line), various loose hammers and cylinder parts , automatic control ring forging machine, heat treatment cellar, digital control fibre natural gas car furnace, standing machine tool, machine tools, standing miller,  standing drill machine, bench drill machine ,CNC machining centre etc

7) Testing equipment: Supersonic inspection machine, Supersonic flaw detecting machine , physics and chemical analysis.

8)Services

a) Also can design and manufacture forged according to the customers' requirement

b) ISO9001 quality control and inspection

c) In house & Third Parties

d) Ordering and warehousing

9)Packing: Wooden cases or according to customers' needs

 

FAQ

 

1. What materials do you use for crankshaft manufacturing?
We primarily manufacture crankshafts from:

Forged Steel: 42CrMo, 40Cr, AISI 4340, EN19, SCM440 - for high-stress applications

Cast Iron: Ductile iron (QT600-3, QT700-2), nodular iron - for cost-effective solutions

Billet Steel: CNC-machined from premium alloy steel billets - for high-performance applications

Special materials available upon request with proper certification

2. What is your production capacity and lead time?
Prototypes/Samples: 15-25 working days

Small Batch Production (1-50 pcs): 30-45 working days

Mass Production (50-500 pcs/month): 45-60 working days, with scheduled deliveries

Maximum Monthly Capacity: 800-1,000 crankshafts (depending on size and complexity)

3. Do you provide custom crankshaft manufacturing?
Yes, we specialize in custom OEM crankshafts. We can produce according to:

Your technical drawings (2D/3D)

Existing sample (reverse engineering available)

Specific engine parameters (stroke, journal diameters, counterweight design)

International standards (ISO, DIN, JIS, SAE)

4. What quality certifications do you have?
We operate under:

ISO 9001:2015 - Quality Management System

IATF 16949:2016 - Automotive Quality Standards (for applicable projects)

Material certifications: Mill Test Certificates (MTC) with traceability

Process certifications: Heat treatment, welding, NDT personnel qualifications

5. What testing and inspection procedures do you perform?
Every crankshaft undergoes:

Dimensional Inspection: CMM measurement, journal diameter/roundness, stroke accuracy

Material Testing: Spectrometer analysis, tensile strength, hardness testing

NDT (Non-Destructive Testing): Magnetic particle inspection, ultrasonic testing for internal defects

Dynamic Balancing: High-precision balancing to G6.3 or better standards

Surface Finish Check: Ra measurement for bearing surfaces

6. Can you produce crankshafts for specific engine types?
We have experience manufacturing crankshafts for:

Automotive Engines: Passenger cars, trucks, buses

Marine Engines: Inboard, outboard, and diesel marine engines

Industrial Engines: Generators, compressors, pumps

Agriculture & Heavy Equipment: Tractors, excavators, construction machinery

Motorcycle & Small Engines: High-performance and standard applications

7. What surface treatments do you offer?
Available treatments include:

Induction Hardening: For journal surfaces (typical hardness 55-60 HRC)

Nitriding: Gas or plasma nitriding for wear resistance

Shot Peening: For fatigue strength improvement

Phosphating/Oxide Coating: For corrosion protection and oil retention

Chrome Plating: For rebuild applications

8. Do you offer heat treatment services?
Yes, our in-house heat treatment includes:

Quenching & Tempering for forged/billet crankshafts

Normalizing & Stress Relieving

Controlled Atmosphere Furnaces to prevent decarburization

Full documentation of heat treatment curves and parameters

9. What is your packaging standard for export?
We provide export-ready packaging:

Individual wrapping with VCI (Volatile Corrosion Inhibitor) paper

Custom foam or wooden supports to prevent transit damage

Wooden crates for large/heavy crankshafts

Clear labeling with handling instructions and part information

Compliance with international shipping regulations

10. What is your MOQ (Minimum Order Quantity)?
Standard Designs: 10 pieces minimum

Custom Designs: 50 pieces minimum (due to tooling investment)

Samples: 1-2 pieces available for testing and approval

Flexible MOQ for long-term partnership projects

11. How do you ensure balance and vibration control?
We implement:

Computerized Balancing Machines with dynamic balancing capability

Material removal/adding techniques (drilling, welding weights)

Simulation analysis during design phase

Final testing at required RPM ranges

12. Can you provide complete engine components besides crankshafts?
We also manufacture:

Connecting rods

Camshafts

Engine blocks/cylinders (casting and machining)

Valve train components

Complete engine assembly services available


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