Introduction: Why has the processing of 9.NiCr8020 strip material become the industry's "hard nut to crack"?
As a star material in the field of special alloy, 9.NiCr8020 strip material boasts excellent corrosion resistance, high-temperature strength, and processing performance, and is widely used in high-end fields such as aerospace and petrochemical industries. However, issues such as surface cracks, dimensional deviations, and unstable performance during the processing process have long been困扰ing industry enterprises. Qinchuan New Materials (Zhengzhou) Co., Ltd. has made breakthrough progress in the optimization of strip material processing technology and equipment upgrading through continuous technical research, providing the industry with a replicable technical solution.

Keywords: 9.NiCr8020 Strip, Process Optimization, Special Alloys, Surface Quality Control, Dimensional Accuracy Improvement

Industry Technology Pain Points: The Three Core Conflicts Behind Processing Challenges
STEP1：Conflict between material characteristics and processing technology.9. The NiCr8020 alloy contains more than 80% nickel (Ni), its high ductility and low thermal conductivity lead to heat accumulation during processing, which is prone to local overheating and deformation. For example, in the cold rolling process, the temperature at the strip edges is 15-20℃ higher than at the center, resulting in edge thickness deviation exceeding 0.5mm, far beyond the industry's permitted range of 0.2mm.
STEP2：Discrepancy between equipment accuracy and material requirementsThe insufficient rigidity of the roller system in traditional rolling machines can lead to roller gap fluctuations of ±0.03mm when processing 0.5-2mm thin strips, whereas the thickness tolerance requirement for 9.NiCr8020 strip materials is ±0.01mm. The inadequate equipment precision directly results in a product pass rate decrease of over 30%.
STEP3：Balancing Surface Quality and Cost ControlTo eliminate processing cracks, enterprises often adopt multi-pass small deformation rolling, but this method leads to a 40% extension in processing cycles and a 25% increase in energy consumption, severely restricting production efficiency. How to reduce processing costs while ensuring surface quality has become an urgent technical challenge for the industry.

Introduction to the technical strength of the enterprise: Qinchuan New Materials' "Three-Blade Axe" solves the processing dilemma
Qinchuan New Materials (Zhengzhou) Co., Ltd. is located in the Zhengzhou High-Tech Industrial Development Zone, with modern standard factory buildings and internationally leading special alloy production lines. The company focuses on the research, development, and manufacturing of high-purity metals and special alloys, and has formed three core technical advantages in the field of 9.NiCr8020 strip processing.
Technical Advantage 1: Dynamic Temperature Control Rolling TechnologyBy installing infrared temperature sensors at the entry and exit of the rolling mill, the temperature distribution of the strip is monitored in real-time. Combined with the adaptive roll gap adjustment system, the temperature difference between the edge and center is controlled within ±3℃. In practical application, a certain aviation parts enterprise reduced the strip thickness deviation rate from 0.5mm to 0.15mm and increased the product pass rate to 98% after adopting this process.
Technical Advantage 2: High Rigid Roller System DesignThe independently developed six-roll mill of our company uses alloy steel roller bushes and hydraulic tensioning structure, with the roller system stiffness reaching 800kN/mm, an increase of 60% over traditional equipment. When processing 1mm thick 9.NiCr8020 strip material, the gap fluctuation is controlled within ±0.008mm, meeting the stringent requirement of ±0.01mm thickness tolerance from high-end customers.
Technical Advantage 3: Surface Crack Prediction ModelAn AI algorithm trained on 100,000 processing data sets can predict the risk of crack formation in advance and automatically adjust rolling speed and lubrication parameters. After a petrochemical equipment manufacturer introduced this model, the crack rate on the strip surface dropped from 5% to 0.3%, saving over 2 million yuan in rework costs annually.

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FAQ Q&A Technical Selection Guide: 9. 5 Key Questions about NiCr8020 Strip Processing
Q1: How to choose the appropriate rolling temperature?
A: 9. The recrystallization temperature of 9NiCr8020 strip material is 850-900°C. During cold rolling, the final rolling temperature should be controlled below 600°C to avoid dynamic recrystallization. Qichuan New Materials utilizes a dynamic temperature control system to reduce the fluctuation range of the final rolling temperature to ±10°C, ensuring the uniformity of the strip material structure.
Q2: How does the lubricant affect the surface quality?
The lubricant must meet both cooling and lubrication functions. The company uses self-developed synthetic ester lubricants with a viscosity index of 180, which can form a stable lubricating film at high temperatures, reducing the friction coefficient from 0.15 to 0.08, significantly reducing surface scratches.
Q3: How to detect internal defects in strip materials?
A: The company is equipped with a German-imported ultrasonic flaw detector, capable of detecting internal cracks and inclusions over 0.1mm. The detection parameters are set to: frequency 5MHz, sampling interval 0.5mm, sensitivity 40dB, ensuring a defect detection rate of ≥99%.
Q4: How is the heat treatment performed on processed strip materials?
A: Recommend using vacuum annealing process with a temperature of 1050℃±5℃, holding time of 2 hours, cooling in the furnace to 600℃ followed by air cooling. This process can eliminate processing stress, reduce hardness from HV320 to HV220, while maintaining the same corrosion resistance.
Q5: How to control the flatness of the strip material?
A: By linking the tension straightening machine with a laser flatness detector, the flatness error is controlled within ±1mm/m. In actual application, a customer's 10m long strip material achieved a flatness error reduction from ±8mm to ±1.5mm, reaching an internationally advanced level.

Technically driven, Qinchuan New Materials leads the industry upgrade.
9. Solving the processing difficulties of NiCr8020 strip material requires coordinated efforts in process optimization, equipment upgrading, and quality control. Inching New Materials (Zhengzhou) Co., Ltd. has achieved a thickness deviation rate of less than 0.15mm, a surface crack rate of 0.3%, and flatness error better than ±1mm/m through core technologies such as dynamic temperature control rolling, high-stiffness roller system design, and AI crack prediction, setting a technical benchmark for the industry. Currently, the company has provided customized solutions for over 30 enterprises in aerospace, petrochemical, and other fields, with cumulative deliveries exceeding 5,000 tons of strip material, meeting the requirements of ASTM B168 standards. In the future, Inching New Materials will continue to focus on the special alloy field, driving high-quality development through technological innovation.
Learn more on the official website:www.qingchuansuperalloy.com