Girth Gear (Ring Gear)
- Weight:
- 5 – 120 T
- Material:
- ZG310-570, ZG35CrMo, GS-20Mn5
Construction & Building Materials Industry
Heavy steel castings for cement plants and building-materials machinery: large girth gears, rotary kiln tyres, supporting rollers, vertical mill grinding discs and crusher components. Cast in ZG230-450, ZG310-570 and alloy steels at our 300T-capacity steel casting foundry, then finish-machined in-house on 8m/10m CNC equipment.
Rotary Kiln Tyre (Riding Ring)
- Weight:
- 20 – 150 T
- Material:
- ZG230-450, ZG35CrMo
Rotary Kiln Supporting Roller
- Weight:
- 5 – 60 T
- Material:
- ZG35CrMo, ZG42CrMo
Roll Sleeve (Vertical Mill)
- Weight:
- 5 – 40 T
- Material:
- ZG270-500, alloy steel
Wheel Stop (Thrust Roller)
- Weight:
- 2 – 25 T
- Material:
- ZG230-450, ZG35CrMo
Building Materials Castings — Häufig gestellte Fragen
Materials for Cement Plant Castings
Rotary kiln tyres and girth gears are typically poured in ZG230-450 (equivalent to ASTM A27 65-35) or alloy grades such as ZG35CrMo and GS-20Mn5 when higher tensile strength and tooth-surface hardness are specified. For wear parts like crusher jaws and moving cones we recommend high-manganese ZGMn13 or martensitic alloy steels. Our metallurgical engineers convert your local standard (ASTM, DIN, EN, JIS) into an exact chemistry and heat-treatment plan.
How We Keep Large Ring Castings Round and Crack-Free
Tyres and girth gears up to 10 meters in diameter are prone to ovality and thermal cracking. We control both through simulation-optimized gating, uniform wall-thickness design review, slow controlled cooling, and post-cast normalizing plus tempering in our 13×8×5m gas furnaces. Every ring is rough-machined, UT-inspected at 100% coverage, then finish-machined to drawing tolerance on our 8m CNC vertical lathes and 10m hobbing machine.
How do you prevent internal defects like blowholes, sand inclusions, and cracks in large steel castings?
We eliminate internal defects through a multi-stage control system. First, we use Ladle Furnace (LF) refining to degas and purify the molten steel, strictly limiting sulfur and phosphorus levels. Second, we optimize the gating system using casting simulation software. Finally, every critical area undergoes 100% Non-Destructive Testing (NDT), including Ultrasonic (UT) and Magnetic Particle (MT) testing, ensuring zero critical defects before shipment.
What in-house Non-Destructive Testing (NDT) capabilities do you have?
Our in-house NDT laboratory is fully equipped and certified. We perform Ultrasonic Testing (UT), Magnetic Particle Testing (MT), and Liquid Penetrant Testing (PT). For special requirements, Radiographic Testing (RT) can also be arranged. All our NDT inspectors hold international certifications (Level II or Level III) to guarantee inspection accuracy.
How do you guarantee the stability and consistency of mechanical properties across different batches?
Consistency comes from standardized heat treatment and digital microstructural analysis. We utilize large, computer-controlled natural gas heat treatment furnaces to perform precise annealing, normalizing, and tempering. Every heat code is tracked, and samples from the same pouring batch are tested for tensile strength, yield strength, impact toughness, and hardness to ensure they perfectly match your specifications.
Can you provide full material traceability and Material Test Reports (MTR)?
Absolutely. Every casting is stamped with a unique Heat Number for lifetime traceability. With each shipment, we deliver a comprehensive document package including Material Test Reports (MTR) complying with EN 10204 3.1, chemical analysis reports (via direct-reading spectrometer), mechanical testing data, and NDT clearance certificates.
What is your typical lead time for a custom heavy steel casting like a slag pot or girth gear?
For large customized castings, the lead time generally ranges from 45 to 75 days, depending on the geometric complexity, pattern-making requirements, and the level of final machining needed. Once the engineering drawings are approved, we provide a detailed project timeline and send weekly progress photos/videos to keep you updated.
Can you manufacture castings that strictly comply with our local standards (e.g., ASTM, DIN, EN, JIS)?
Yes. We are highly experienced in international standard conversions. Whether your project specifies American standards (ASTM A27, ASTM A148), European standards (EN 10213, DIN GS-20Mn5), or Japanese standards (JIS G5101), our metallurgical engineers will configure the exact chemical composition and heat treatment parameters to meet or exceed those requirements.
Want a Custom Building Materials Casting? Talk to Our Engineers.
Submit your 3D/2D engineering drawings (STEP, PDF). Our engineers will review your specs and return a transparent quote within 24 hours.
- Engineering reply within 24 hours
- NDA before you send drawings, on request
- ASTM · EN · DIN · JIS standards supported