Some low-alloy steels, such as 2 ¼ Cr – 1Mo, can experience a phenomenon known as temper embrittlement. This is the reduction in toughness due to metallurgical embrittlement that results from long-term exposure to high-temperature. Temper embrittlement occurs from 650°F to 1070°F (343°C to 577°C) and is most commonly of concern in hydrotreating reactors and exchangers, although it can occur in other locations (API 571).
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