Interpipe has developed and mastered a new production technology of Class D wheels. The certification of new product is being finalized. At September, 2016, Interpipe NTRP is planning to receive AAR certificate for Class D wheels.

A search of a new chemical composition was carried out in cooperation with Institute of Iron and Steel. The best composition was mastered at Interpipe Steel. Engineers of the wheel-rolling shop found the best modes of heat-treatment and then a few pilot batches were produced.

The Class D wheels successfully passed all test, including prolonged abrasion tests conducted by Institute of Iron and Steel following special developed methodology. All processes and tests were conducted after approving of AAR representatives.

Готовое к отгрузке колесо по стандарту AAR