SNV DIN 17221 : 1988
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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HOT ROLLED STEELS FOR SPRINGS SUITABLE FOR QUENCHING AND TEMPERING; TECHNICAL DELIVERY CONDITIONS
01-01-2003
12-01-2013
Applies for not rolled bars, ribbed and grooved spring steel, wire rod, wide flats, strip and semi-finished products of spring steels. The standard specifies the requirements concerning e.g. manufacturing process, heat treatment and surface conditions at the time of delivery, chemical composition, maximum hardness, hardenability, inner and outer soundness. The standard includes specifications for testing and marking the products.
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