What causes the sharpness of the blade to decrease after painting? Heat from curing and tempering.
After the baked coating, the sharpness of the blade decreased, and the spring's return became weaker. The cause may be the tempering due to the heat from the baking process, which could have reduced the hardness of the steel. Here are the countermeasures explained.
After applying the baked-on paint, the sharpness of the blade decreased, and the spring's return became weaker. Why does the performance of the parts change just by painting? 【First, please look here】 □ Occurring with hardened blades, springs, and tools → Possibility of tempering □ Hardness not measured before and after painting → Unable to notice changes □ Baked-on temperature determined only by the recommended values of the paint 【Why does this happen?】 Hardened steel is tempered at a specified temperature to adjust its hardness. If the baking temperature of the paint is close to or exceeds this tempering temperature, the steel is tempered again, resulting in a decrease in hardness. Even if the paint film looks nice, the parts become defective. 【Countermeasures you can take starting today】 1. Confirm the heat treatment conditions (tempering temperature) with the drawings or heat treatment vendor. 2. Choose paint that can be baked at a temperature lower than that. 3. Measure and verify the hardness before and after painting on prototypes. 【Free materials】 The considerations for baking conditions tailored to materials and parts are introduced in the "Baked-on Paint Service" materials.
Inquire About This Product
Related Videos
basic information
Subject: Powder coating of hardened steel parts / Verification items: Tempering temperature, curing temperature and time of the paint, hardness measurement before and after painting.
Price range
Delivery Time
Applications/Examples of results
Countermeasures for the reduction of hardness (tempering) in the baked coating of hardened parts such as blades, springs, and tools, and training for design and purchasing personnel.
catalog（1）
Download All Catalogs
Company information
We are not just a "subcontracted painting factory." Established in 1958, our company has a foundation of painting technology and also specializes in chemical treatment, stripping, and cleaning, functioning as the "external surface treatment department" in your organizational chart. Based on our philosophy of "preparation is eight-tenths of the work," we emphasize participation from the "upstream process" before the drawings are finalized. We conduct test painting on a wide range of metals and difficult materials, and we produce the entire process from assembly, packaging, to delivery, thereby reducing your management workload. Additionally, by being able to perform zinc phosphate treatment in-house, we achieve stable painting quality. Furthermore, our micro-heating stripping technology, which does not use chemicals, maintains the electrical state of the "jigs (hangers)" that influence painting quality. Our approach of "pre-treatment determines painting quality" ensures the stability of the paint film during mass production. Rather than simply "applying specified standards," we work backwards to achieve optimal painting specifications and prevent scratches during transportation, sparing no effort in thorough discussions from the outset. This diligent preparation is the shortest path to preventing rework and minimizing total costs. From the development stage, please utilize the expertise of our specialists as part of your production line.
