Low-alloyed steel for the preparation of valve spring wire
AssigneeAktiebolaget Garphytte Bruk
InventorChrister Lanner
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Abstract
A valve spring wire having superior fatigue and relaxation properties is disclosed, comprising, in addition to iron, manganese and silicon, together with aluminum and nitrogen for obtaining a fine-grain effect.
Claims4
Valve spring wire of low-alloyed steel, characterized in that the wire has been oil hardened and tempered and in that the steel consists essentially of the following composition, expressed in weight percent:
- ______________________________________ C 0.5 1.0% Si 0.1 1.5% Mn 1.0 2.0% Al.sub.tot 0.01 0.05% N 0.004 0.020% ______________________________________
- the remainder being iron as well as normally occuring impurities.
A valve spring for internal combustion engines made of valve spring wire of low-alloyed steel, characterized in that the wire has been oil hardened and tempered and in that the steel consists essentially of the following composition expressed in weight percent:
- ______________________________________ C 0.5-1.0% Si 0.1-1.5% Mn 1.0-2.0% Al.sub.tot 0.01-0.05% N 0.004-0.020% ______________________________________
- the remainder being iron as well as normally occurring impurities.
Dependencies are inferred from the claim text.