Seamless steel pipe delivery status

The delivery conditions of seamless steel pipes refer to their state following the final plastic deformation or heat treatment. These tubes can be delivered in different states, each with distinct characteristics based on the manufacturing and processing techniques used.

Manufacturing State:

Hot-Rolled or Cold Drawn (Rolled) State: Tubes in this state are delivered without any further heat treatment after their initial production process. This means they maintain the properties imparted by the hot rolling or cold drawing process.

Heat-Treated State:

Tubes can also undergo specific heat treatments to enhance their properties before delivery. Common heat treatments include:

Normalizing: Heating the steel to a specific temperature and then cooling it in air to refine the grain structure and improve uniformity.

Tempering: Heating the steel to a temperature below its critical point and then cooling it, which increases toughness and reduces brittleness.

Solution Annealing: Heating the steel to a high temperature and then rapidly cooling it to dissolve alloying elements and achieve a homogeneous structure.

Annealing: Heating the steel to a specific temperature and then slowly cooling it to relieve internal stresses and improve machinability.

Delivery State:

Annealed State: Tubes delivered in the annealed state have undergone annealing to facilitate easier subsequent processing.

Original State: Tubes may also be delivered in their original, untreated state, which is suitable for specific applications.

When placing an order for seamless steel tubes, it is essential to specify the desired delivery state in the contract to ensure the product meets the necessary specifications.

Weight Delivery Status

The weight of seamless steel tubes at delivery can be defined in two ways:

- Actual Weight:

The actual weight is the precise weight of the product at the time of delivery, measured using scales or other weighing devices.

- Theoretical Weight:

The theoretical weight is calculated based on the nominal dimensions and density of the steel, using standard formulas. This method assumes uniform dimensions and density, providing a consistent basis for pricing and ordering.

Specifying the weight delivery status in the contract ensures there is no ambiguity between the supplier and the buyer regarding the weight basis for the delivered product.