Changzhou Tiangong Forging Co., Ltd.
Changzhou Tiangong Forging Co., Ltd.
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42CrMo4 Large Diameter Rough Machined Heavy Steel Forgings for Hydraulic Cylinders. Our 42CrMo4 large diameter heavy steel forgings are precision forged to meet the demanding strength and performance requirements of hydraulic cylinder components in heavy-duty industrial applications. Manufactured using high-quality 42CrMo4 alloy steel, these parts offer excellent toughness, wear resistance, and fatigue strength—making them ideal for use in harsh, high-pressure environments.
Each forging is rough machined according to customer specifications, with consistent dimensional accuracy and surface integrity. We supply forgings in weights ranging from 100 kg to 7000 kg, suitable for both small batch and bulk production needs.
Whether you require a custom forging for OEM use or replacement parts for hydraulic systems, our ISO-certified factory ensures reliable quality and on-time delivery.
Material: 42CrMo4 alloy steel
Forging Process: Open die / free forging
Machining: Rough machined only (final machining by customer)
Size & Weight Range: Custom sizes, from 100 kg up to 7000 kg
Application: Hydraulic cylinders, heavy machinery, mining equipment, press systems
Standards: ISO 9001, ISO 14001, ISO 45001 certified
Inspection: Ultrasonic testing, chemical and mechanical property testing available
Packaging: Steel frames or wooden cases, export-safe
| Item | Details |
|---|---|
| Product Name | 42CrMo4 Large Diameter Rough Machined Heavy Steel Forgings for Hydraulic Cylinders |
| Material Grades | - Alloy steels tailored for high compressive strength, fatigue resistance, and dimensional stability under rolling loads and temperature fluctuations |
| Forging Equipment | - Hydraulic Hammers: 5T, 8T, 12T- Suitable for open die forging of extra-large diameter components and heavy-section parts |
| Manufacturing Process | Raw material inspection → Unloading → Inspection → Preheating → Forging → Heat Treatment → Inspection → Rough Machining → Non-Destructive Testing → Final Inspection → Packaging → Delivery |
| Forging Ratio | ≥ 3.0 — Improves internal uniformity, grain flow, and durability under high torque and compressive stress during rolling operations |
| Heat Treatment Options | - Normalizing and tempering to refine microstructure, improve dimensional stability, and relieve internal stress |
| Applications | - Backup rolls, work roll shafts, and coupling components in hot/cold strip mills- Support rollers, drive shafts, and rolling mill housing components |
| Process Compliance | - Manufactured based on customer-provided technical drawings and heavy load service requirements |
| Delivery Conditions | - Supplied heat treated and rough machined to allow final processing by OEMs- Custom geometry available for rolling mill integration |
| Testing & Inspection | - Chemical Composition Testing- Mechanical Testing: Strength, Toughness, Hardness- NDT: Ultrasonic Testing (UT), Magnetic Particle Testing (MT)- Dimensional Inspection using precision tools |
Process flow:
raw material inspection → unloading → inspection → preheating → forging → heat treatment → inspection → rough machining → non-destructive testing → inspection → packaging → delivery.
Frequently Asked Questions (FAQs)
1. What is your forging weight range?
We produce forged parts ranging from 100 kg to 7000 kg.
2. Do you provide heat treatment and machining?
Yes, we offer full in-house heat treatment, rough, and finish machining services.
3. Which industries do you supply to?
We serve wind energy, heavy equipment, port machinery, transmission systems, and more.
4. What is your production lead time?
With stock: Around 30 days
Without stock: 40–45 days
5. Where is your factory located?
In Changzhou City, near Shanghai, with shipping via Shanghai Port.
Request a Quote
Please send your technical drawings and requirements to us. Our engineers will review and provide you with a professional quotation and solution shortly.