BS EN ISO 4885:2015 pdf free

BS EN ISO 4885:2015 pdf free.Ferrous products – Heat treatments – Vocabulary
spontaneously heat flow from a body at a higher temperature to a body at a lower temperature. In the absence of external drivers, temperature differences decay over time, and the bodies approach to thermal eqilibrium,see also metal handbook, Volume 4.
often referred to simply as convection, is the transfer of heat from one place to another by the movement of fluids. Convection is usually the dominant form of heat transfer in liquids and gases, see also metal handbook,Volume 4
NOTE Heat convection during quenching can be single phase (as in gas quenching) or dual phase (as in water quenching with water and vapour film at the same time. Usually single phase convection has a lower heat transfer than dual phase convection.
thermal radiation is the emission of electromagnetic waves from all matter that has a temperature greater than absolute zero. It represents a conversion of thermal energy into electromagnetic energy, see also metal handbook, Volume 4.
series of operations in the course of which a solid ferrous product is totally or partially exposed to thermal cycles to bring about a change in its properties and/or structure
NOTE The chemical composition of the ferrous product may possibly be modified during these operations. (see thermochemical treatment.)
prolonged high temperature annealing intended to reduce by diffusion; to a greater or lesser extent, the herogeneities of chemical composition due to the phenomenon of segregation
forming of steel products in a temperature range usually between 780℃ up to 1300℃ depending from the chemical composition
NOTE 1 Hot forming includes hot-olling, hot forging, hot bending, etc.
NOTE 2 Forming between the temperatures of hot forming and cold forming is calld war forming.
a process by which various metals, it is most important in big work pieces and high-strength steels, became brittle and fracture following exposure to hydrogen.
NOTE Hydrogen emtbitlement is often the result of unintentional introduction of hydrogen into steel during melting,forming or finishing operations (e.g. electroplating) and increases the risk of cracking in the material.
annealing below A1 temperature, the holding time depends on the size of the work piece and the hydrogen content
NOTE Hydrogen emibitlement is often the result of unintentional introduction of hydrogen into steel during melting,forming or finishing operations (e.g. electroplating) and increases the risk of cracking in the material.BS EN ISO 4885 pdf download.