Seamless pipe delivery conditions

1. Delivery status
It refers to the state of final plastic deformation or final heat treatment of the delivered product. The hot-rolled or cold drawn (rolled) state or manufacturing state generally delivered without heat treatment; the heat-treated state after heat treatment delivery, or the normalizing, tempering, solid solution, annealing according to the type of heat treatment status. When ordering, the delivery status must be specified in the contract.
Quenching: The process of rapid cooling after heating above the transformation point temperature. Improve the hardness of the material, but reduce the toughness.
Normalizing: After heating above the transformation temperature, cool normally (in air).
Annealing: After heating to above the transformation point temperature, slowly cool. Eliminates quenching effects, eliminates stress, and homogenizes components.
Tempering: After quenching, heat to a certain temperature (below the quenching temperature), keep warm, and then cool. Uniform ingredients, slightly reduced hardness, significantly improve toughness.

2. Delivery according to actual weight or delivery according to theoretical weight
Actual weight - at the time of delivery, the weight of its product is delivered according to the weighing (weighing) weight;
Theoretical weight - The weight of the product at the time of delivery is calculated from the nominal size of the steel.