Heat Treating for HSS

    In real production condition, post-production heat treatment is an available finishing option with two of the below manufacturing standards: ASTM A1085 and CSA G40. Some HSS production manufacturers have the ability to perform heat treatment on site, but usually it involves transportation of the HSS to a third-party heat-treating facility. Ordering will generally need to be done directly with a producer, and heat treatment will entail extra cost.? Heat treatment is available with A1085 by specifying Supplement S1, and with CSA G40 by specifying Class H. Both of these standards describe identical heat treatment, at a temperature of 850°F (450°C) or higher, followed by cooling in air. Manufacturers of product to CSA G40.20-13/G40.21-13 Grade 350WT Class H Category 2 Toughness should be able to demonstrate, through MTC, that all of the requirements of ASTM A1085 with Supplement S1 are met, for dual certification.

    Heat treatment at a temperature at the range of 850 to 900°F , and does not affect the metallurgical properties to the extent of influencing the toughness.? It has been shown that such heat treatment does not provide any improvement in the Charpy V-notch (CVN) toughness of North American cold-formed HSS.

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