Solved cases

Treating super long pieces

Super long piece case 1

I want to harden super long rails.

For example, induction hardening can treat up to 7 m in length with little distortion.

Super long piece case 2

I want to quench long shafts with small diameter without too much distortion.

Super long piece There are several methods depending on the material used.
For example, we can treat structural carbon steel products of Ф2 to 6mm x 500 to 2,000 mm in size.
We can suppress the distortion within 0.2 mm, which is within the tolerance of centerless grinding.
(* In case of Ф6 mm x 2,000 mm. Measured at 500 mm pitch.)
For Ф4 mm and above, it is possible to create a difference between the surface hardness and the internal hardness.

Super long piece case 3

Is it possible to perform induction hardening on large diameter eccentric shafts?

Super long piece We have experience with eccentric shafts of Ф330 x 2,500 mm. (Refer to the drawing)
A hardened layer up to 4 mm is possible. Also, we can treat the maximum diameter of Ф340 mm (with a length up to 2,500 mm). And in case of gear and sprocket, the maximum size would be Ф2,000 mm.

Super long piece case 4

I am treating long pieces with gas soft nitriding in all-case-type batch furnace but they have too much distortion.

Super long piece We assume the distortion is amplified because the pieces are laid down and treated.
At Heat Treatment Solution, we can achieve low distortion by hanging long pieces vertically (up to 1 m in length) in a pit furnace.

Super long piece case 5

I want to quench a thin super long pipe with induction hardening while suppressing distortion.

Super long piece The product was an electric resistance welded tube of 1.6 mm in plate thickness and Ф125 x 6,000 mm in size.
Consulted about the selection of materials, we could achieve a low distortion of less than 3 mm at quenching. We can quench the center up to 10 m in length if the product is a shaft within Ф200 in diameter and has a straight outside diameter.

The cycle of heat treatment has infinite possibilities. Various heat treatment tests are available at Heat Treatment Solution.
For details of equipment specifications, please refer to the "Equipment" section in "Heat Treatment technology of the Solution" page.

Heat treatment method

We own various equipment including vacuum heat treatment, salt bath heat treatment, carburizing heat treatment, induction hardening, nitriding heat treatment, etc.
We also own various testing instruments, such as sub-zero equipment, various hardness testers, metallographic examination equipment and coercive force meters.

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