Forging offers uniformity of composition and structure. Forging results in metallurgical recrystalisation and grain refinement as a result of the thermal cycle and deformation process. This strengthens the resulting steel product particularly in terms of impact and shear strength.Forged steel is generally stronger and more reliable than castings part.
About Getai Hydropower
We are a leading and professional turbine manufacturer of China. Our main products include quality hydroturbine and relevant accessories, including Pelton turbine runner, Francis turbine runner, Kaplan turbine runner, distributor, guide vane, blade, nozzle pipe, spiral case, conical pipe, elbow pipe, etc. for hydroturbine.
We made the first integrally-forged CNC-machining Pelton turbine runner in China in 2009, and the first integrally-forged CNC-machining Francis turbine runner in China in 2017.
Now our products are popular in more than 30 provinces in China and 20 countries all over the world, including the USA and Canada in North America; Japan, India, Pakistan, Viet Nam, Laos, Nepal in Asia; Serbia, Slovenia in Europe; Peru, Chile, Brazil in South America; Congo Kinshasa in Africa; Australia, Papua New Guinea in Oceania.
We are able to manufacture mono-block cast and forged steel CNC machining Pelton runner. Our Pelton runners are highly efficient, cavitation and wear resistant and coated with HVOF, and therefore have high performance, which can help the power station to bring more economic profits.
We are also able to perform the Pelton runner repair and renovation project through repair welding. The repaired products can also reach high value of performance, and can save the costs for the clients.
Product Introduction
1. Brief introduction for Forged Integrally and CNC Machined Pelton Turbine Runner
Forging could considerably improve metal’s organizational structure and mechanical property.
Forging offers uniformity of composition and structure. Forging results in metallurgical recrystalisation and grain refinement as a result of the thermal cycle and deformation process. This strengthens the resulting steel product particularly in terms of impact and shear strength.
Forged steel is generally stronger and more reliable than castings of same material due to the fact that the grain flows of the steel are altered, conforming to the shape of the part.
Performance comparison table of forging parts and casting parts
Performance test of forging part
| Mechanical Property | σb（Mpa） | σ0.2（Mpa） | δ5（%） | ψ（%） | AKV（J/cm²） | HB | |||||
| Standard value | ≥795 | ≥620 | ≥15 | ≥45 | ≥50 | 230～295 | |||||
| Actual value | Horizontal | 815 | 655 | 17.5 | 64.5 | 107 | 102 | 110 | 259 | 256 | 253 |
| Vertical | 820 | 660 | 18.5 | 67 | 149 | 152 | 136 | 256 | 257 | 257 | |
Performance test of casting part
| Mechanical Property | σb（Mpa） | σ0.2（Mpa） | δ5（%） | ψ（%） | AKV（J/cm²） | HB | ||||
| Standard value | ≥750 | ≥550 | ≥15 | ≥35 | ≥50 | 221～286 | ||||
| Actual value | 770 | 610 | 17 | 50 | 84 | 88 | 85 | 252 | 255 | 254 |
Forged CNC machining process
2. Machining vedio for the Forged CNC machined Pelton runner.
3. ISO 9001 Quality Management system is carried out to ensure better management control
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4. All raw material strictly conform to international standard, key component such as runners, guide vane is Forged and entire CNC machined.
Chemical Composition for ASTM A473 S41500 and ASTM A743 CA6NM（%）
| Material No. | C | Si | Mn | P | S | Cr | Ni | Mo |
| ASTM A473 S41500 | ≤0.05 | ≤0.60 | 0.5-1.0 | ≤0.030 | ≤0.030 | 11.5-14.0 | 3.5-5.5 | 0.40-0.80 |
Mechanical Property for ASTM A473 S41500 and ASTM A743 CA6NM
| Material No. | σ0.2(Mpa) | σb(Mpa) | δ5(%) | ψ(%) | Akv (J/cm2) | HB |
| ASTM A473 S41500 | ≥620 | ≥795 | ≥15 | ≥45 | ≥50 | ≤295 |
5. State of the art machining and testing equipment, as well as licensed professional engineers all combined to help guarantee better product precisioness.
6. All product is subject to strict inspection according to international standards and client special requirements.
On August 24, 2020, the independent supervisor authorized by Japanese Client visited Shenyang Getai Hydropower Equipment Co., Ltd. for the FAT inspection of Pelton runner manufactured by Getai Hydropower for Kanden Kurobe HPP in Japan. Kanden Kurobe HPP is a well-known Japanese government project, while the Pelton runner for this project is the largest integrally-forged CNC-machining Pelton runner ever manufactured by Getai for its Japanese clients, with D1 of 2520mm, weight of 10,400kg, rated output of 95MW and rated head of 545.5m.
This inspection lasted for 3 days, which mainly includes the dimension inspection, PT, profile inspection, roughness inspection and hardness test on the runner. The Japanese Client has made strict requirements for product processing technique and quality, while the supervisor worked very hard in a rigorous manner, and set high standards for the inspection and testing of each data. Because of the rich experience, advanced processing technique and excellent product quality, Getai Hydropower won the approval of the supervisor and the product eventually was inspected by the supervisor as qualified. The FAT inspection was completed successfully on August 26, and the Pelton runner has been packaged for shipment to Japanese Client.
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