Non-treated, medium-strength bolts / Daiichi Kogyo Co., Ltd.

A manufacturing method that ensures strength without heat treatment through an independent forming process, taking environmental impact into consideration.

Plastic deformation is applied to metals, and as the degree of deformation increases, work hardening is achieved, resulting in a higher yield point than the original metal. The metal exhibits strong resistance to loads in the direction of the work hardening, but the yield point against loads in the opposite direction decreases, making it easier to undergo plastic deformation at lower stress levels. This phenomenon is called the Bauschinger effect. Our company has developed and launched a molding process technology that suppresses the Bauschinger effect. This special molding process enables the production of bolts with mechanical properties without the need for heat treatment. Non-quenched, medium-strength bolts are products that secure a strength classification equivalent to 8.8 without heat treatment. The absence of heat treatment reduces environmental impact and shortens manufacturing lead times. From development to evaluation, our team of experts is here to assist with the optimal design of screws. Please feel free to reach out to us.

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