What is the smoothness of the inner hole of the seamless cold drawn tube?

The smoothness of the inner hole of cold drawn seamless tube is an important indicator affecting its quality. It not only affects the appearance quality of the product, but also directly impacts the customer's output and finished product quality. Therefore, it is necessary to understand the smoothness that can be achieved in the inner holes of cold drawn seamless tubes.

1. Cold drawn mould: Defects in the cold drawn mould itself can lead to poor internal smoothness of seamless steel tube products. Huagang Industrial uses professionally customised precision moulds, which have good precision and cost after cold drawing, resulting in good internal and external surface quality.

2. Acid washing: Due to environmental requirements, many manufacturers do not have acid washing processes or accumulated data on steel acid washing, resulting in incomplete cleaning and impurities inside cold drawn seamless steel tubes, or excessive acid washing leading to pitting, pits, etc. Huagang Industrial has its own fully enclosed and environmentally friendly pickling tank, which not only has accumulated data for more than ten years, but also can more accurately control pickling time and concentration through transformation and optimisation.

The smoothness requirements for the inner holes of cold drawn seamless tubes vary depending on different industries and application needs. In the field of hydraulic steel tubes, the requirement for inner hole smoothness is usually very high, reaching an accuracy level of Rz2.0mm/m. However, many manufacturers find it difficult to achieve such high precision requirements due to technological limitations or cost considerations. Huagang Industrial can perfectly provide high-quality products that meet the standards.