By Reed Miller
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Still, perhaps the most critical of the heat-treat processes – the quench – has seen little technological advancement in the past 40 years. Most continuous-process quench-and-temper facilities utilize one of two antiquated types of quenching strategies: either a simple barrel quench or a tangential quench. Fig. 1. Thermatool precision slot quench Barrel Quench While the barrel-quench design is one of the oldest quench methods for cooling tube and bar product, it has some inherent disadvantages.
22,23] The maximum heat-transfer coefﬁcients exhibited by the vegetable oils in this study decreased as follows: sunﬂower > corn > soybean > canola > cottonseed Comparison of the heat-transfer coefﬁcient as a function of temperature afforded a better differentiation of the quenching performance exhibited by these vegetable oils than afforded by the more conventional cooling-curve analysis. While both of the petroleum quench oils Microtemp 157 (T 157) and Microtemp 153B (T 153B) exhibited full-ﬁlm boiling, this was typically not observed for any of the vegetable oils evaluated in this study.
Unfortunately, for product ranging up to 300 mm diameter, this issue can be very cost-intensive and require a large capital investment in a straightener. This situation is so common in existing barrel-quench applications that the API speciﬁcation refers to “warm re-straightening” as an approved process. Tangential Quench A second type of quench frequently used by oil-country tubular goods (OCTG) producers is the tangential quench. As a counterpoint to the barrel-quench limitations, the intent of a tangential quench is to improve the ability of the quenchant to travel on and off of the product quickly.
Industrial Heating September 2011 by Reed Miller