SUS 420J1 Stainless Steel Coil Material Standards Designations

Understanding the material standards and designations for SUS 420J1 stainless steel coil is fundamental for ensuring material traceability, compliance, and global sourcing efficiency. SUS 420J1 is the standardized Japanese designation, as defined by the Japanese Industrial Standards (JIS) under specification G 4303:2005 for stainless steel bars and G 4304:2005 for hot-rolled plates and sheets. This alphanumeric code precisely identifies a martensitic stainless steel with specific chemical and mechanical properties.
For international procurement and technical communication, recognizing equivalent grades is crucial.SUS 420J1 stainless steel coil is most commonly aligned with AISI 420 in the United States system. In the European standard (EN), it corresponds to 1.4021, while the older German DIN standard refers to it as X20Cr13. The "X" denotes a high-alloy steel, "20" indicates the approximate carbon content (0.20%), "Cr13" signifies about 13% Chromium, which is the defining composition of this grade.
This cross-standard equivalency is vital for global supply chains. When a component specification calls for AISI 420 in the U.S., a European drawing specifies 1.4021, or an Asian supplier quotes SUS 420J1 stainless steel coil, they are all fundamentally referring to the same base material. This uniformity ensures that engineers, procurement specialists, and fabricators worldwide can confidently select and source this material, guaranteeing consistent performance, heat treatability, and corrosion resistance regardless of the geographical origin. Therefore, a clear grasp of these designations prevents specification errors and facilitates seamless international trade and manufacturing.