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How to choose the right grade of stainless steel?

发布时间:[2020-5-9 8:57:25]    浏览量:900次

Selecting the right stainless steel grade for a specific application is vitally important in order to achieve a sustainable solution, while cost aspects must also be taken into consideration. There are several stages when material selection needs to be made:

    New applications and equipment
    New processes and process changes
    Exchange of material due to poor performance
    Exchange of existing material to minimize cost

To make the right material selection it is important to get a full picture of the service conditions the steel will face. The first aspects to consider could be material related, for example:

    Corrosion resistance
    Mechanical strength
    Fabricability
    Physical properties
    Surface aspects

Other factors that may influence the decision include:

    Possibilities for weight reduction
    Availability
    Cost
    Life Cycle Cost (LCC)
    Recyclability
    Legislation, standards, and approvals
    Previous experience

 
Corrosion resistance

Corrosion engineering uses corrosion data from the environment in which the material is to be exposed. Field testing in, or laboratory testing to simulate, the environment is often required in order to identify which grades would be most suitable.
 
Strength and fabricability

Designing load-bearing structural applications, such as bridges, pressure vessels, and structural automotive components, is mostly done by applying the mechanical strength data provided in national and international standards and design codes. Fabricability, of special grades in particular, is crucial for material selection.
 
High temperatures

Equipment to be used at elevated temperatures (>550 °C) is designed using creep and oxidation data, and previous experience is important when selecting material. In many applications the material is consumed after a period of time.

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