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Whether during the manufacturing or during the actual application of a finished product, there is a corrosion rate which varies by environment that is applied. Abundant in supply, hydrogen will naturally alter physical properties of a fastener unseen by the eye. As unrelated as these two may seem, they actually work together and create a situation where a fastener could fail unexpectedly. Through enough corrosion, and diffusion of hydrogen into the metals, the bond between the metal grain structures weakens, and the structure of the product is attacked, causing weakness, brittleness, and cracks. This situation, also known as hydrogen assisted corrosion cracking, fosters and environment in which the product could fail in an unpredictable manner, and induces danger to the user of the product.
The purpose of this particular product is to create a fastener product with high ductility within the load bearing area of the fastener. The increase in ductility and hardness would in turn lower the sensitivity it will have to the damages caused by embrittlement by way of hydrogen as well as corrosion. Having a lower sensitivity will safeguard the fastener from the disadvantages of embrittlement such as sudden loss of strength, unexpected and delayed failure. The drilling tip and the leading threads are separately heat treated using different methods. The loading area of the fastener will have a hardness below HRC32, this would safeguard the fastener itself from the effects of hydrogen and corrosion induced embrittlement, preventing delayed and unexpected failure, thus enhancing the performance of the fastener. The drilling tip will be created to have the necessary hardness to penetrate and thread connecting elements in concrete, which is extremely crucial as well.
