The delivery conditions for hydraulic steel tubes include: Cold Finished/Hard (BK), which increases hardness through cold working; Cold Finished/Soft (BKW), which has lower hardness after cold working, balancing strength and ductility; Cold Finished/Stress-Relieved Annealing (BKS), where cold working is followed by annealing to relieve internal stresses and improve dimensional stability; Annealed (GBK), which enhances ductility and machinability through full annealing; and Normalized (NBK), which improves mechanical properties and toughness through normalizing.
Hydraulic steel tubes delivery conditions: Raw Material Status
Hot Rolled: The steel is formed at high temperatures and typically results in a rougher surface finish.
Cold Drawn: The steel is pulled through a die at room temperature, resulting in a smoother surface and tighter tolerances.
Cold Rolled: Similar to colddrawn but involves rolling rather than drawing.
Hydraulic steel tubes delivery conditions: Heat Treatment Status
Annealed: Heating the steel to a specific temperature and then slowly cooling it to relieve internal stresses and improve ductility.
Normalized: Heating the steel above its critical point followed by air cooling, which refines the grain structure and improves toughness.
Quenched: Rapid cooling from a high temperature to increase hardness and strength.
Hydraulic steel tubes delivery conditions: Processing Status
ColdDrawing: This process involves pulling the steel through a die to reduce its diameter and improve mechanical properties.
ColdFinishing: Additional processing to refine the surface finish and mechanical properties after initial colddrawing.
Hydraulic steel tubes delivery conditions: Surface Status
Bright: The tube has a shiny, smooth surface finish.
Pickling: The hydraulic tube is treated with acid to remove scale and impurities, resulting in a clean surface.
Galvanized: The hydraulic tube is coated with zinc to enhance corrosion resistance.
Hydraulic steel tubes delivery conditions: Specific Delivery Conditions
1. Cold Finished/Hard (BK):
Description: The steel tube undergoes cold working processes, resulting in increased hardness.
Application: Used when higher strength and hardness are required.
2. Cold FinishedSoft (BKW):
Description: Involves cold working but with a lower level of hardness compared to BK.
Application: Used when a combination of strength and ductility is needed.
3. Cold Finished/StressRelieved Annealing (BKS):
Description: The tube undergoes cold working followed by stressrelieving annealing to eliminate internal stresses and improve dimensional stability.
Application: Suitable for applications where stability and reduced internal stress are important.
4. Annealed (GBK):
Description: The tube is fully annealed, improving ductility and machinability by relieving stresses.
Application: Ideal for applications requiring good machinability and toughness.
5. Normalized (NBK):
Description: The tube is normalized, enhancing mechanical properties and removing irregularities in the microstructure.
Application: Used in applications requiring higher strength and toughness.
Hydraulic steel tubes delivery conditions: Heat Treatment Impact
Annealed State: Exhibits good machinability and toughness.
Normalized State: Higher strength and hardness, suitable for enhanced strength requirements.
Quenched State: Increased hardness and wear resistance, ideal for high wear resistance applications.
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