Setting an industry benchmark and presenting the strength of Chinese manufacturing, the “Rising Chinese Brands” program recently interviewed Mr. Zhu Hanhua, founder and chairman of Jiangsu Yonghao High Strength Bolt Co., Ltd., to discuss innovation and growth in the fastener industry.

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Bolts are described by several common terms, including screws, bolt fasteners and fasteners, but all refer to mechanical components that use helical geometry and friction to progressively secure parts. They are indispensable in daily life and industrial manufacturing and are often called the “rice of industry” because of their broad use. Bolts are found in electronics, machinery, digital products, power equipment, electromechanical systems, ships, vehicles, hydraulic projects and even laboratory equipment. Precision miniature bolts are used in products such as DVD players, cameras, eyewear, watches and electronics; general-purpose bolts are used in televisions, electrical appliances, musical instruments and furniture; large bolts and nuts serve engineering, construction and bridge projects; and vehicles, aircraft, trams and automobiles use fasteners in many sizes. As long as industry exists, bolts will remain essential components.

Stainless steel is increasingly favored for its corrosion resistance and durability. How do stainless-steel photovoltaic bolts differ from iron-based bolts? Both ironmaking and steelmaking rely on reduction and oxidation reactions, but they serve different purposes: ironmaking reduces iron from ore, while steelmaking removes excess carbon and other impurities from pig iron. Iron-carbon alloys containing less than 2% carbon are classified as steel, while those containing more than 2% are classified as cast iron; from a metallurgical perspective, “stainless iron” is not a standard material designation. Steel is widely used because it combines toughness, elasticity and rigidity. Although buyers often judge stainless steel by whether it rusts or is attracted to a magnet, chromium is the principal element governing corrosion resistance. When chromium content exceeds 10.5%, a protective oxide film forms on the surface and helps prevent further corrosion.