Overview
JIS G 3106 is a Japanese Industrial Standard (JIS) specifying requirements for rolled steels used in general structures. It is widely adopted in construction and manufacturing due to its balanced properties of strength, ductility, and weldability. The standard defines grades such as SS400 and SM490, each tailored for different load-bearing applications. Developed by the Japanese Standards Association, JIS G 3106 ensures consistency in quality for structural components. Its adoption is common in Asia, though equivalent standards like ASTM A36 (USA) or EN 10025 (Europe) may be preferred elsewhere. Buyers should confirm regional compliance before procurement.
Structure and Working Principle
JIS G 3106 steels are hot-rolled carbon steels with a ferrite-pearlite microstructure, providing a combination of tensile strength (400–490 MPa) and elongation (17–21%). The material's performance relies on controlled carbon content (typically 0.18–0.29%) and minimal impurities. These steels are designed to withstand static and dynamic loads in structures. Their weldability is ensured by limiting carbon equivalents (Ceq), while manganese content enhances toughness. Surface scales from hot rolling are often removed via pickling or shot blasting to improve corrosion resistance.
Key Features
JIS G 3106 steels offer high yield strength (245–325 MPa) and tensile strength, making them suitable for load-bearing frames, bridges, and machinery bases. Their ductility allows for cold bending and forming without cracking. Weldability is a standout feature, facilitated by low carbon equivalents. However, preheating may be required for thicker sections to avoid hydrogen-induced cracking. The standard also permits trace amounts of alloying elements like chromium and nickel for enhanced performance in specific environments.
Application Areas
Primary applications include building frameworks, industrial plants, and infrastructure projects like bridges and transmission towers. The SS400 grade is commonly used for non-critical structures, while SM490 is preferred for heavier loads. In manufacturing, these steels serve as bases for machinery, conveyor systems, and storage racks. Their cost-effectiveness and reliability make them a staple in construction across Japan, Southeast Asia, and export markets. Regional variants may include weather-resistant coatings for outdoor use.
Maintenance and Precautions
To prevent corrosion, store JIS G 3106 steels in dry, ventilated areas and apply protective coatings if exposed to moisture. Regular inspections for rust or deformation are recommended in high-stress applications. During welding, adhere to preheat and interpass temperature guidelines to maintain material integrity. Avoid abrupt cooling, which can cause brittleness. For cutting, plasma or oxy-fuel methods are typical, but mechanical sawing minimizes heat-affected zones.
B2B Procurement Guide
When sourcing JIS G 3106 steels, verify mill test certificates for chemical composition and mechanical properties. Reputable suppliers should provide documentation aligning with JIS standards. Consider logistics: steel plates and sections are heavy, so freight costs significantly impact total procurement expenses. Bulk orders (20+ metric tons) often attract discounts. For projects requiring strict tolerances, specify additional processing like edge milling or ultrasonic testing.
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