I. Technical Background and Industry Status

As a company focusing on the research, development, and manufacturing of high-purity metals and special alloys, Qichuan New Materials (Zhengzhou) Co., Ltd. leverages the location advantage of the Zhengzhou High-Tech Industrial Development Zone to establish a full-process technical system covering melting, precision processing, heat treatment, and testing. Its Haynes230 alloy product line has formed a complete closed loop from laboratory research to mass production, making it one of the few domestic enterprises capable of supplying the full range of this material.

Chapter II: Analysis of Core Technology Layout

1. Melting process control
Using the double process of vacuum induction melting (VIM) + electroslag remelting (ESR), the oxygen content is controlled below 15ppm through a three-stage vacuum system, a 60% reduction compared to traditional processes. For the critical carbon content of 0.05-0.15% in Haynes 230 alloy, a carbon gradient control technology has been developed to ensure uniform distribution of grain-boundary carbides, achieving a tensile strength of 31MPa at 980℃/1000h, which is 20% better than Inconel 617 alloy.

2. Heat Treatment System Optimization
Exclusive three-step solid solution treatment process: initial solid solution at 1175℃ (retained for 25min) + final solid solution at 1200℃ (retained for 15min) + rapid water quenching, combined with stress-relieving annealing at 870℃，ensuring the material maintains a room temperature elongation of over 15% after aging for 3000 hours at 760℃，and achieving the heat stability index as required by ASME SB-564 standard.

3. Precision machining capabilities
Equipped with a five-axis CNC machining center and laser welding equipment, capable of:
Turbine blade surface processing accuracy ±0.02mm
- Cold rolling deformation rate control for thin-walled parts (δ≤1.5mm) ≤8%
- Welded joint strength of non-standard parts reaches 92% of the base material

Chapter 3: Typical Application Cases

1. Aerospace engine combustion chamber modification
Haynes 230 combustion chamber liners provided for an aviation company exhibit a 40% reduction in oxidation rate under 1150℃ cyclic oxidation conditions, achieving continuous operation without cracks for 2000 hours. By optimizing the Al₂O₃+Cr₂O₃ composite oxide layer structure, the material's corrosion resistance in sulfur-containing environments is elevated to ISO 9227 NSS 1000h.

2. Petroleum cracking furnace tube localization
For the operating conditions of ethylene cracking furnace tubes (1050℃/0.5MPa), a Haynes230+ nano-coating composite solution has been developed. After 1000 hours of field testing, the wall thinning rate is reduced to 0.03mm/year, a 35% decrease compared to imported materials, saving 1.2 million yuan in annual replacement costs per furnace.

4. Technical Parameters and Standard System

1. Core Performance Indicators
| Parameter | Value | Test Standard |
|--------------|-----------------------|-------------------|
Tensile Strength | ≥690MPa (Room Temperature) | ASTM E8
Creeptoughness | 31MPa (980℃/1000h) | ASTM E139
Coefficient of Thermal Expansion | 14×10⁻⁶/K (20-1000℃) | ASTM E228
Grain Size | ASTM 5 or finer | ASTM E112

2. Quality Control System
- Certificate of Material Conformity (MTC) provided for each batch
- Perform AMS 2630 ultrasonic inspection (defect indication ≤0.8mm)
Heat treatment process certified by NADCAP
Support DNV, TÜV and other third-party inspections

V. Technological Trend Development

Current research and development focuses include:
Develop welding technology for dissimilar material joints of Haynes 230/Inconel 718, resolving the manufacturing challenges of dual alloy structures for aircraft engines.
2. Research process parameters of laser additive manufacturing (SLM) to achieve near-net-shape forming of complex components
3. Develop a thermal processing process control system based on digital twin technology, reducing the fluctuation range of process parameters to ±1.5℃.