BS EN 10020

Definition and Classification of grades of steel

BS EN 10020

Definition and Classification of grades of steel

`By`

`Chemical composition`

Carbon content > 2% is usually classified as cast iron

`By`

`Property or Application`

Non alloy steel

Non alloy

None of the limit values in Table 1 reached

Stainless steel

≥ 10.5% chromium
≤ 1.2% carbon

Other alloy steel

Not complying with stainless steel, and in which at least one of the limit values in Table 1 is reached

Stainless

Quality steel

are grades which in general have specified property requirements such as toughness, grain size control and/or formability

Special steel

Have higher degree of cleanliness in respect of non metallic inclusions. They are usually intended for quenching and tempering or surface hardening.
Complies with one or more of the listed requirements.

`By nickel content`

`By main property`

Nickel < 2.5%

Nickel ≥ 2.5%

Corrosion resisting

Heat resisting

Creep resisting

Other alloy steels

Alloy quality steels

are grades for which requirements exist with regard to toughness, grain size control and/or formability. Not generally intended for quenching and tempering or surface hardening

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Alloy special steels

Grades other than stainless steels which are characterized by precise control of chemical composition and conditions of manufacture and process control.