ITW® refers to high-strength spring steel wire that has the following advantages by continuously  quenching and tempering the wire material wire for a quite very short time by a high-frequency induction rapid heating method.

- Uniform microstructure with fine grains and uniform mechanical properties over the whole length can be obtained.

- Surface decarburization arises almost zero.

- Both high strength and high toughness can be obtained.

- Excellent cold coiling formability can be obtained.

- Springs with high durability, high sag resistance and stable productivity can be obtained.

ITW® which is compliant with JIS G 3560 and JASO (Japanese Automotive Standards Organization)

C605-96, GB / T 18983-2017, is widely used widely for the automoble suspensions and motorcycles

springs including general industrial spring regardless of wire diameter and strength,  because of its high uniformity and excellent performance of reduction of area in tensile test.