Multi-stage gradient heat treatment method for high-strength tie rod forgings
By employing a multi-stage gradient heat treatment method, the stress problem caused by temperature gradients in high-strength tie rod forgings was solved, achieving uniform internal structure and stress release, thereby improving product qualification rate and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XUANCHENG LONGHU PRECISION TECH CO LTD
- Filing Date
- 2026-04-27
- Publication Date
- 2026-07-17
AI Technical Summary
During the uniform cooling process, high-strength tie rod forgings are prone to longitudinal cracks and local deformation due to the temperature gradient differences between the surface and the core, and between the rod body and the joint. This can affect the product qualification rate and service life, and even cause safety accidents.
A multi-stage gradient heat treatment method is adopted, including forging pretreatment, differentiated gradient holding and three-stage gradient cooling, combined with a dedicated heat treatment furnace with zoned temperature control and inert gas protection, to precisely control the temperature and cooling rate at each stage, ensuring the uniformity of the internal structure of the forging and stress release.
It significantly reduces the incidence of longitudinal cracks in forgings, improves product qualification rate and service life, meets the mechanical performance and stability requirements of high-strength tie rod forgings, and enhances load-bearing stability and operational reliability.