Physical properties – each of the main groups of stainless steels has a tightness, coefficient of thermal expansion. thermal conductivity specific heat current resistance Magnetic suction ability and the melting period These values must be close enough for most engineering purposes. in terms of thermal properties The heat resistance of stainless steel has three observations:
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- having a high melting point make a good creep rate Compared to ceramics at temperatures below 1000 °C
- Having a moderate thermal conductivity This makes stainless steel suitable for use in applications that require heat resistance. (Container) or require good thermal conductivity (heating machine)
- Having a moderate expansion coefficient therefore can use a large length by using less connectors (e.g. in roof construction)
Mechanical Properties – Typically 70-80% of the steel content is made up of two important properties of steel: hardness and toughness. Stainless steel provides a neutral value of both hardness, toughness and toughness. Because it contains a lot of iron. And there will be more in the austenitic type. Stainless steel, regardless of the type that is easy to soften, can make good cold forming, such as deep drawing (Deep Drawing) to the highest strength type which is obtained by cold forming or quenching or precipitation hardening, which is suitable for making springs.
stainless steel selection
The selection of a specific type of stainless steel will depend on what needs by application. In most cases the primary consideration is corrosion resistance. Tarnish resistance or high temperature oxygenation resistance In addition to these needs The selected stainless steel must have certain minimum mechanical properties such as strength, toughness, flexural strength and fatigue strength. Different types and grades of stainless steels may provide the required corrosion resistance and mechanical properties. In this case, the final selection must be made on the basis of available alloys. lowest cost which will meet the needs of use
selection of fill metal
Fillings for stainless steel welding are produced as flux-clad electrodes (AWS A5.4), metallic core wires and solid cores (AWS A5.9), flux filament wire (AWS A5). .22) Items, electrodes, solid core wire, metal strip wire and flux filament wire, if a valid matching filling material cannot be obtained. A higher alloy content is required. There are many types of austenitic stainless steels. where matching fillers are not made. Examples 201, 202, 205, 216, 301, 302, 304 and 305 are recommended fillers for base alloys. These are some alloys with high chromium and nickel content. 301, 302, 304 and 305 and may be used for 201, 202, 205 and 216 if 209, 219, 240 are not available.
If the highest strength and maximum corrosion resistance properties are specified for the application The corresponding fill metal must be used. or the same mixture for the base metal for martensitic base alloys or semi-austenitic The workpiece must be welded in Full thawing and treating heat curing if applicable. If this is not feasible, components must be melted prior to welding. and then perform the curing operation after welding. It is suggested that stainless steel is hardened. by austenitic precipitation will not treat heat after welding because of the problem of rupture