Mono Block Forged CNC Machined Francis Runner

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Mono Block Forged CNC Machined Francis 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.

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.

 

Forged Entire CNC Machined Francis Runner Introduction

Forged Integrally +100% CNC Machining Francis Turbine Runner

1. GETAI has improved the manufacturing procedure of Francis turbine runner which suffered from the problems such as the cavitation and abrasion, welding seam cracks between crown, band and vanes, block worn off from vane etc. The whole Francis runner is forged integrally followed by entire CNC machining to eliminate tiny blowholes and slag inclusions existed on passage surface which accelerate cavitation and abrasion, and solve the potential risk existed by unreleased stress left after welding. The Francis turbine runner service life prolonged consequently.

In the case the high head Francis runner with long and narrow passageway which is hard for entire CNC machining or the runner size exceeds the forging range which can not be forged integrally, GETAI applied a procedure by dividing the runner to two parts which consisted of crown with half vanes and band with rest half, both two parts can be forged integrally with entire CNC machining and welding assembled in final. The welding applied to the middle of vane, where is convenient for single pass welding without touch of potential crack area, the operation security and service life are improved largely.

 

Samples exhibited below is for forged integrally+100% CNC machined Francis turbine runner (half part) which finished by our five axis linkage CNC machine.

Mono Block Forged CNC Machined Francis Runner

2. Machining vedio for the Forged entire CNC machined Francis runner.

 

 

 

 

3. ISO 9001 Quality Management system is carried out to ensure better management control

 

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.

Mono Block Forged CNC Machined Francis Runner

 

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