ISO 14104:2017 specifies procedures and requirements for the detection and classification of localized overheating on ground surfaces by chemical etch methods. The process described in this document is typically used on ground surfaces; however, it is also useful for the detection of surface anomalies that result from post-heat treatment machining such as hard turning, milling and edge breaking (deburring) processes. Surface metallurgical anomalies caused by carburization or decarburization are also readily detectable with this process. Some methods which have been used in the past are no longer recommended. Specifications are intended to be changed to use the methods in this document. These etching methods are more sensitive to changes in surface hardness than most hardness testing methods. ISO 14104:2017 applies to steel parts such as gears, shafts, splines and bearings. It is not applicable to nitrided parts and stainless steels. NOTE This process, although at times called "nital etch", is not intended to be confused with other processes also known as "nital etch". The surface temper etch procedure is performed after grinding and before additional finishing operations such as superfinishing, shot peening and honing.

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ISO 6336-5:2016 describes contact and tooth-root stresses and gives numerical values for both limit stress numbers. It specifies requirements for material quality and heat treatment and comments on their influences on both limit stress numbers. Values in accordance with ISO 6336-5:2016 are suitable for use with the calculation procedures provided in ISO 6336‑2, ISO 6336‑3 and ISO 6336‑6 and in the application standards for industrial, high-speed and marine gears. They are applicable to the calculation procedures given in ISO 10300 for rating the load capacity of bevel gears. ISO 6336-5:2016 is applicable to all gearing, basic rack profiles, profile dimensions, design, etc., covered by those standards. The results are in good agreement with other methods for the range indicated in the scope of ISO 6336‑1 and ISO 10300‑1.

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ISO 14104:2014 specifies procedures and requirements for the detection and classification of localized overheating on ground surfaces by chemical etch methods. The process described in ISO 14104:2014 is typically used on ground surfaces; however, it is also useful for the detection of surface anomalies resultING from post-heat treatment machining such as hard turning, milling, and edge breaking (deburring) processes. Surface metallurgical anomalies caused by carburization or decarburization are also readily detectable with this process.

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ISO 6336-5:2003 describes contact and tooth-root stresses, and gives numerical values for both limit stress numbers. It specifies requirements for material quality and heat treatment and comments on their influences on both limit stress numbers. Values in accordance with it are suitable for use with the calculation procedures provided in ISO 6336-2 and ISO 6336-3 and in the application standards for industrial, high speed and marine gears. They are also suited to the calculation procedures given in ISO 10300 for rating the load capacity of bevel gears. It is applicable to all gearing, basic rack profiles, profile dimensions, design, etc., covered by those standards. The results are in good agreement with other methods for the range indicated in the scope of ISO 6336-1.

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Describes contact and tooth-root stresses and gives numerical values for both limit stress numbers.

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Specifies standard procedures and requirements for the detection and classification of localized overheating on ground surfaces by chemical etch methods. Does apply to steel parts such as gears, shafts, splines and bearings, but does not apply to nitrided parts and stainless steels.

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