ASTM A 729 Class H Structural and constructional steels
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ASTM A 729 Class H Chemical Composition
A729/A729M: 2017 / Standard Specification for Carbon and Alloy Steel Axles, Heat-Treated, for Mass Transit and Electric Railway Service
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ASTM A 729 Class H Physical Properties
Temperature
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ASTM A 729 Class H Heat Treatments
- After heating to and holding at an appropriate temperature in the austenitic range, the axles shall be quenched in a suitable medium. A furnace charge thus treated is termed a quenching charge. Following quenching, the axles are tempered.
Tempering - Axles shall be reheated gradually to and held at an appropriate subcritical temperature and shall then be allowed to cool under uniform conditions. A furnace charge thus treated is termed a tempering charge. When required by supplementary requirement S2, axles that have been rough machined after heat treatment shall be heated to and held for an appropriate time at a temperature that is less than the last tempering temperature by at least 10°C (50°F). Then the axles shall be quenched directly into water with the axle length vertical.
Straightening- if necessary, shall be done before machining and at a temperature between 510°C (950°F) and 55°C (100°F) below the final tempering temperature. Straightening performed at temperatures lower than 510°C (950°F) shall be followed by stress relieving or applicable heat treatment. These requirements do not apply to straightening performed prior to final heat treatment.
ASTM A 729 Class H Mechanical Properties
Temperature
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ASTM A 729 Class H International Equivalent Materials
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Equivalence categories reflect chemical-composition and mechanical-property comparison — always verify suitability against the governing specification for your application.
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- 1Cross References
- 4Composition
- 8Mechanical Properties
- 3Physical Properties
- 1Heat Treatment
- -Metallography
- -Machinability
- -Stress-Strain
- -Formability
- -Fatigue
- -Fracture
- -Creep
- -Joints
- -Coatings
- 19Dimensions
- -Tribology
- -Corrosion
- -Ageing
- -Weatherability
- -Irradiation
- -Total Suppliers