What Is The Cold Drawn / Hard（+C (BK)）?

Cold drawn/hard delivery state refers to the behavior of delivering steel pipes directly at room temperature without heat treatment after processing them into specifications and sizes that meet customer requirements. Compared to hot delivery (after quenching, tempering and other heat treatments), cold delivery steel pipes have higher strength and hardness.

What are the characteristics of Cold drawn / hard(+C (BK))steel tubes?

1. High strength: Steel pipes delivered in a cold state have not undergone heat treatment, resulting in small grain size, dense structure, and high strength.

2. High hardness: Due to the small grain size, the hardness value of the material is higher than that of steel pipes delivered in a hot state.

3. Poor toughness: Steel pipes delivered in cold state have lower toughness than those delivered in hot state due to the lack of heat treatment.

What are the application areas of Cold drawn / hard(+C (BK))steel tubes?

Steel pipe coolers are widely used in automotive manufacturing, machinery manufacturing, shipbuilding and other fields, and their advantages in strength and hardness make them ideal materials for these fields.

Precautions

Process-ability: Cold drawn / hard(+C (BK)) should not be directly cold formed (such as bending or expanding), and require annealing treatment.

Weldability: Cold work hardening may increase the risk of welding cracks and requires pre welding heat treatment.