What is Heat-treatment in steel induσ£stries?

Heat-treatment is the ​&process of heating and colling metals✘★ , using specific predetermined € methods to obtain desired propertΩ↓♦ies.

Common heat-treatmen∑₩t methods:

Normalizing: Heating steel or ¶♣α∞steel parts to an appropriate tempe• rature above the critical point AC3•✘ or ACM for a certain period of α₽₹time and then cooling in the air to ∑™↕←obtain a heat treatme ™nt process for pearlite-lik∑✘•e structure.

Annealling : Heat th♠ ↓e hypoeutectoid steel workpiece to 2§<☆¥0-40 degrees above AC3, after hol£•‌Ωding it for a period of£♠β time, it is slowly cooled wi→£∞th the funace(or buri↔•€&ed in sand or lime) to belo<ε w 500 degrees and cooled in the aiπ₽r.

Quenching: A heat treatment process₽±in which the steel is austenitized an"↔₹€d cooled at an appropriate cooling r€&∏ate to make the workpiece under‍Ωgo martensite and other unγ&↔stable structural transform¶≥↓÷ations in the cross section or ≤←βwithin a certain rang♠↕e

Tempering: The quenched workpiece iπ&•σs heated to an appropriat•←e temperature below the crit♠©ε<ical point AC1 for a cer'"π≤tain period of time,δ​"β and then cooled by a met₩¥∏hod that meets the requirements to ¥♠&obtain the required structure≥§¥ and performance of φ→the heat treatment process

What is QT?

QT is for Quenching and Tempering±✔→‌.

Anyang Longteng Heat Treatment use ☆ε≥s multi- frequency heating in our  ©™•heating furnace, which can ove© ‍rcome the weakness of single f↔•♣requency heating to the curie point o↓↑✔←f inefficiency. At the same time,≠♣÷‌ different heating depths oε∞f  different frequencies can m₩↔ake the bars heated in a short time.α±✔± This is the technical guarante¶€©e of rapid heating.