en.Wedoany.com Reported - China's Daye Special Steel Co., Ltd. recently completed the first delivery of tie rod forgings for a self-developed heavy-duty gas turbine. Heavy-duty gas turbines are known as the "crown jewel" of the equipment manufacturing industry, and their tie rod forgings, as core transmission components, have long been monopolized by foreign technology.

The tie rod forgings delivered this time are manufactured from a specific grade of high-temperature alloy and serve as the core locking component for the self-developed heavy-duty gas turbine. Due to the extremely demanding service conditions, the dimensional accuracy, microstructural uniformity, and performance stability must meet a zero-tolerance standard, while also satisfying ultra-high requirements for full cross-section hardness difference, hardness difference within the same batch of bars, and straightness.

After more than three years of technical research, the key breakthrough lies in establishing a closed-loop process integrating smelting, forging, heat treatment, and machining, while simultaneously overcoming two major industry challenges: hardness uniformity and straightness. The immersion ultrasonic testing of the forgings achieved the highest AAA-level acceptance, and the full cross-section grain size is also comparable to that of imported materials.

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