Optimum Spring manufactures extension, torsion and compression springs with Oil Tempered – ASTM A See the chemical composition and physical properties of ASTM A Grade I, find alternative materials, and connect with suppliers. Wire is available in size ranges from””. Chemical Composition. Per ASTM-A *Max values. Dimensional Tolerances. Tolerance (inch). Carbon.

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This specification covers two classes of oil-tempered steel spring wire intended especially for the manufacture of mechanical springs and wire forms. The steel may be made by any commercially accepted steel-making process and shall either be ingot cast or strand cast.

The finished wire shall be free of detrimental pipe and undue segregation. The wire shall be oil quenched and tempered to produce the qstm mechanical properties such as tensile strength. Cast, heat, and product analysis shall conform to the chemical composition requirements prescribed for carbon, manganese, phosphorus, sulfur, and silicon. Tension, wrap, and surface tests shall be performed.


ASTM A Oil-tempered Steel Wire, Class I

The surface of the wire as-received shall be free of rust, excessive scale die marks, pits, qstm scratches detrimental to the end application. Other metallurgical requirements such as microstructure and decarburization are detailed.

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Oil Tempered – ASTM A 229

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ASTM A229 Grade I

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