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What are the delivery conditions for hydraulic steel tubes?

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.

Hydraulic steel tube

Hydraulic steel tubes

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