Introduction to API Spiral Pipe Production Standard

API standard spiral steel pipe spiral pipe export specifications, the international standard throughout the use of.
Material: X42, X46, X52, X56, X60 Specification: API 5L External anticorrosive treatment or black paint, commonly used in oil and natural gas transmission pipeline spiral steel pipe.
API standard spiral steel pipe friction reduction, wear resistance, including through the conflict factor, wear and relative wear factor to reflect.
Conflict factor
Objects that touch each other, as a relative movement will lead to conflict, resulting in conflict resistance known as conflict. According to the law of conflict, usually the conflict force (F) and imposed at the conflict site of the straight load (N) ratio, called the conflict factor F μ = - N where: F - conflict (N) The straight load (N) wear on the part
(G) or volume (cm 3) of the sample after a specified period of time or after a certain distance of the collision under regular experimental conditions is referred to as the wear amount (or wear amount) The volume indicates that the volume wear is known as the relative wear resistance coefficient
In the imitation of the wear test machine, the choice of 65Mn (52-53HRC) as a standard sample, under the same conditions, standard sample wear and the measured data of the positive wear ratio, known as the measured data relative wear coefficient

Abstract from Tianjin Xinyue Steel Group