The Japanese Industrial Standards (JIS) define high-quality steel specifications widely used across Asian manufacturing and engineering sectors. These standards ensure precision, reliability, and compatibility for automotive, construction, and industrial applications.
Major JIS Steel Classifications
1. Carbon Steels (JIS G 3101)
- SS330 – General structural steel (Minimum yield: 205 MPa)
- SS400 – Most common carbon steel for construction (Tensile: 400-510 MPa)
- SS490 – Higher strength structural steel
2. Alloy Steels (JIS G 4051)
- SCr420 – Chromium steel for gears and shafts
- SCM435 – Chromium-molybdenum alloy for high-stress parts
- SNCM439 – Nickel-chromium-molybdenum aircraft-grade steel
3. Stainless Steels (JIS G 4303)
- SUS304 – Standard 18/8 austenitic stainless steel
- SUS316 – Molybdenum-added corrosion-resistant grade
- SUS410 – Heat-treatable martensitic stainless
4. High-Tensile Steels (JIS G 3114)
Industrial Applications
Automotive: Chassis components (SS400), gears (SCr420)
Construction: Building frames (SM490), bridges (SM570)
Manufacturing: Machinery parts (SCM435), fasteners (SUS304)
Energy: Pressure vessels (STPG370), pipelines (STS410)
Advantages of JIS Steels
- Precision Manufacturing: Strict Japanese quality control
- Regional Standardization: Dominant across Asian supply chains
- Performance Consistency: Reliable mechanical properties
- Cross-Industry Compatibility: Used in automotive to infrastructure
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