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TMK-ARTROM starts production on new heat treatment line for pipes

Published by
World Pipelines,

In February 2018, after a successful test phase, TMK-ARTROM based in Slatina, Romania, granted SMS group the final acceptance certificate (FAC) for the supplied tube and pipe heat treatment line. Designed for an annual capacity of 160 000 t, the new heat treatment line will be used for the production of seamless high-strength pipes up to a wall thickness of 60 mm for mechanical applications as well as of special Oil Country Tubular Goods (OCTG) pipes.

TMK-ARTROM starts production on new heat treatment line for pipes

During final acceptance testing, some very outstanding results were achieved: in particular, it was possible to quench a pipe of steel grade 4140 of 50 mm wall thickness, reaching 90% of martensite without generating any cracks in the pipe, as the ultrasonic test confirmed. Such result is enabled by the precision and performance of the control system of SMS group quenching devices. According to TMK-ARTROM, currently no other pipe producer is able to reach these results with a water based quench. “SMS group has confirmed its longstanding experience and reliability as a partner able to successfully deal with technological challenges like this commissioning at TMK-ARTROM,” states Cristian Drinciu, COO of TMK-ARTROM.

The project mainly consisted of the supply of an austenitising furnace with walking beam transport system, a cooling quenching head, a quenching tank, a walking beam tempering furnace and a cooling bed. The line allows carrying out various process steps, such as quenching, normalising and tempering. SMS group also supplied a ten-roll straightening machine arranged downstream of the tempering furnace, which guarantees straightening results of 0.9 mm/m for the pipe end and 0.8 mm/m for the pipe body. The column design and group drives are a proven design which allows easy maintenance and quick and easy tool changing.

The presence of two separate quenching systems makes this heat treatment line extremely flexible. It features an outside sprayer primarily intended for small pipes and fast production rates and a special tank for processing the heavier-walled tubes. The quenching process for the various pipe sizes and grades had been simulated in advance with the SMS-Quench computational model in order to develop the process recipes that were later on transferred to the control system of the real line.

The annealing furnaces are heated by eco-friendly, digitally controlled recuperative burners, which produce with very low nitrogen oxide (NOx) emissions in the furnace. These burners allow fuel savings of up to 5% compared to conventional burners.

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