Key Characteristics
As the inner and outer walls of precision bright tubes have no oxide layer, they withstand high pressure without leakage, with high precision, high finish, no deformation during cold bending, and no cracks during expansion and flattening. They are mainly used to produce pneumatic or hydraulic components, such as cylinders or oil cylinders, and can be seamless or welded tubes.
Material and Processing
The chemical composition of precision bright tubes includes carbon, silicon, manganese, sulfur, phosphorus, and chromium. High-quality carbon steel is precision rolled, followed by non-oxidation bright heat treatment, the NBK state, and non-destructive testing. The inner wall of the steel pipe is brushed with special equipment and high-pressure flushing, anti-rust oil is applied for rust prevention, and both ends are sealed for dust prevention.
Surface and Dimensional Quality
The inner and outer walls of the steel pipe are high-precision and high-finish. After heat treatment, the steel pipe has no oxide layer, and the inner wall is highly clean. The steel pipe withstands high pressure, does not deform during cold bending, and has no cracks during expansion and flattening, and its color is bright white with a high metallic luster.
Applications
Precision bright tubes can undergo various complex deformations and mechanical processing and are used for pneumatic and hydraulic cylinders, shock absorbers, machine tool guides, and mechanical components requiring precise bores and clean surfaces. The tight tolerances allow direct assembly without extensive machining.
Quality Verification
Each lot is verified by dimensional inspection of the bore and outside diameter, surface roughness measurement, eddy current or ultrasonic testing, and pressure testing where required. The NBK condition confirms the oxide-free bright surface.
Frequently Asked Questions
Q: What is a precision bright tube?
A: A precision steel tube with an oxide-free bright surface produced by non-oxidation heat treatment.
Q: What does NBK mean?
A: Bright annealed, a non-oxidation heat treatment condition producing a clean, bright surface.
Q: What are the main uses?
A: Pneumatic and hydraulic cylinders, shock absorbers, and precision mechanical components.
Q: Why is the inner wall clean?
A: Special brushing and high-pressure flushing remove contaminants after heat treatment.
Q: Can it be cold bent?
A: Yes, without deformation, and it expands and flattens without cracks.
Q: What testing is applied?
A: Dimensional, surface, NDT, and pressure testing as required.
For precision bright steel pipe quotations with your required bore and finish, contact our sales team.
