4.2 Stainless Steels

Stainless steels are usually defined as alloy steels containing at least 10% chromium, either alone or with other alloying elements. In the United States, steels with as low as 8% chromium are included in this classification. Stainless steels are specified when special properties, such as corrosion resistance and resistance to scaling are required. Some grades, such as Type 422, have strength and impact toughness up to 650°C (1200°F).

Stainless steels are considered more difficult to forge than carbon or alloy steels in that they require higher forging pressures at normal forging temperatures. Three groups within the general classification of stainless steel are of interest in forging: ferritic, austenitic and martensitic. There are many special grades of stainless steels not classified in any of these groups. For example, a whole series of forging alloys is included in what might be termed special stainless or heat resistant grades.


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Stainless steels are usually defined as alloy steels containing at least 10% chromium, either alone or with other alloying elements. In the United States, steels with as low as 8% chromium are included in this classification. Stainless steels are specified when special properties, such as corrosion resistance and resistance to scaling are required. Some grades, such as Type 422, have strength and impact toughness up to 650°C (1200°F).

Stainless steels are considered more difficult to forge than carbon or alloy steels in that they require higher forging pressures at normal forging temperatures. Three groups within the general classification of stainless steel are of interest in forging: ferritic, austenitic and martensitic. There are many special grades of stainless steels not classified in any of these groups. For example, a whole series of forging alloys is included in what might be termed special stainless or heat resistant grades.


Return to Table of Contents

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Stainless steels are usually defined as alloy steels containing at least 10% chromium, either alone or with other alloying elements. In the United States, steels with as low as 8% chromium are included in this classification. Stainless steels are specified when special properties, such as corrosion resistance and resistance to scaling are required. Some grades, such as Type 422, have strength and impact toughness up to 650°C (1200°F).

Stainless steels are considered more difficult to forge than carbon or alloy steels in that they require higher forging pressures at normal forging temperatures. Three groups within the general classification of stainless steel are of interest in forging: ferritic, austenitic and martensitic. There are many special grades of stainless steels not classified in any of these groups. For example, a whole series of forging alloys is included in what might be termed special stainless or heat resistant grades.


Return to Table of Contents

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