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Oil tempering process is the term commonly used in the wire industry to designate a type of wire which receives a hardening and tempering treatment after it has been drawn to the desired size. The term is in fact incorrect as the process consists of a heating above the critical temperature, one oil quenching and one reheating or tempering (usually in lead) to relieve the quench hardness obtained. Nowhere in the sequence is oil to be found as the tempering medium. This type of wire is recognized by the spring makers because of its combination of excellent elastic properties and good toughness.

Advantage

Only Wire rods with the quality suitable for oil-tempered wires are used. The most modern wire surface shaving equipment In-line heat treatment facility to guarantee “zero” de-carburization. Oil Tempering line capable of maintaining uniform oxide coating with “zero de-carburization.” No surface defects on final products 100% guaranteed with Double Eddy Current Testing. Eddy Current testing is carried out on material with high demands on surface quality Capable of producing OT wire with various thickness of oxide layer required by the customer.

Classification	Application
Valve Grade	engine v/v spring, clutch spring, pump& generatorspring, spring for air compression equipment, autosuspension spring, etc.
Commercial Gradel	shutter spring, spring torsion bar, screen, shockabsorber spring, spring for industrial machine, hood,mine, spring for garage door, etc.

Production Process

The product can be provided with both the shaved and the unshaved process. Pickling - shaving - drawing - oil quenching and tempering - quality inspection and storage The oil tempered spring wire is produced with technology of Austenite induction heating with Eddy current detector on line for defects without destruction. The Eddy current detector for defects features the function of recording and printing the length of the whole coil and position, number, type of the marks(defects) to guarantee the quality of final product. The production of the oil tempered spring wire is wholly controlled under PLC program.

Shapes and Dimensions

MATERIAL GRADE	SIZE(shape)
MATERIAL GRADE	D	TW		TW		TW		TW
	DIA	THK	WIDTH	THK	WIDTH	THK	WIDTH	THK	WIDTH
70	0.7-12.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
75	0.7-12.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
80	0.7-12.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
72B	0.7-12.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11v	1.0-10.0	1.0-10.0
82B	0.7-12.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
65Mn	0.7-13.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
60Si2Mna	1.0-18.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
55CrVA	1.0-18.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
55CrSiV	1.0-18.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
50CrVA	1.0-18.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
60Si2CrA	1.0-18.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0
60Si2CrVA	1.0-18.0	1.0-6.0	1.0-18.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-11.0	1.0-10.0	1.0-10.0