boiler heat-hot surface metal material

Heating of Steel: Oxidation and Decarburisation | Metallurgy

When a steel part is heated to high temperatures for heat treatment its surface reacts chemically with the surrounding medium in the furnace. The furnace atmosphere may consists of various gases depending on the conditions of combustion and the temperature The common furnace gases are O 2 CO 2 CO H 2 H 2 O (water vapour) N 2 CH 4 etc.

Learn More

What is boiler | Types of boiler | How does a steam boiler ...

Jan 15 2019 · The heating surface in the furnace are receives heat primarily by radiation. The steam boiler tubes absorb the radiant heat from flame and radiate a small portion of the heat back to the furnace. 2. Convection. Convection is the process of transferring heat by movement energy through a material. Example of heat transfer by convection in steam ...

Learn More

How Heating Metal Affects Its Properties | Metal ...

Sep 09 2015 · The process involves heating the metal to a specific temperature then allowing it to cool slowly at a controlled rate. Annealing alters the physical and chemical properties of the metal to increase ductility and reduce hardness. This facilitates shaping stamping or forming processes and allows the metal to be cut more easily.

Learn More

Glossary | Johnston Boiler | Top Quality Boiler ...

Combustible Material Any material that burns when it is exposed to oxygen and heat. ... Heating Surface Any part of a boiler metal that has hot gases or combustion on one side and water on the other. Heat Recovery System Equipment that is installed to reclaim heat that is normally lost.

Learn More

Materials Used for Heating Elements | Electrical4U

Feb 24 2012 · Nichrome is best suitable and ideal material for making heating element. It is having comparatively high resistance. When the heating element is heated first time chromium of alloy react with oxygen of atmosphere and form a layer of chromium oxide on outer surface of heating element.

Learn More