SUS 201 stainless steel under JIS G4305 should be treated as a specification, not simply as a low-nickel 201 label. For Japanese-standard purchasing, the grade, chemical limits, mechanical requirements, surface finish, dimensional tolerances, and delivery form should all be confirmed together. This is especially important when buying cold-rolled sheet, coil, or strip for applications that require a JIS-compliant mill certificate.

What Does SUS 201 Under JIS G4305 Mean?

JIS G4305 covers cold-rolled stainless steel plate, sheet, and strip. Therefore, a purchasing description such as SUS201 + JIS G4305 identifies both the grade and the governing product specification.

This is different from using “201 stainless steel” as a general commercial term. A generic 201 description does not, by itself, prove that the material meets the Japanese standard. For Japanese projects, the purchase order should state the JIS grade and the applicable product standard.

SUS201 JIS G4305 Chemical Composition

The JIS composition table places SUS201 in the chromium-manganese-nickel austenitic stainless family. Manganese and nitrogen help provide the required austenitic structure while nickel is kept lower than in conventional 304 grades.

The exact edition of JIS G4305 should still be stated in a technical purchase specification when certification is critical. This avoids confusion caused by older tables, supplier catalogs, or different product standards.

JIS G4305 Mechanical Requirements for SUS201

For the standard cold-rolled product condition, the commonly published JIS G4305 requirements for SUS201 include minimum tensile strength of 520 MPa, minimum 0.2% proof strength of 275 MPa, and minimum elongation of 40%. Maximum hardness is commonly specified at 100 HRB.

These values should not be confused with strengthened conditions such as 1/4H, 1/2H, 3/4H, or H used for cold-worked stainless strip. If a customer needs a hard temper, the required temper condition must be written separately in the inquiry.

JIS G4305 Surface Requirements: 2B and BA

Surface condition is a major part of Japanese stainless purchasing. SUS201 cold-rolled products can be supplied with different surface finishes according to the required appearance and processing route.

Do not use “2B” or “BA” only as a visual description. For Japanese procurement, the finish should be included in the purchase specification together with thickness, width, edge condition, and delivery form.

Dimensions and Tolerances Under JIS G4305

JIS G4305 does not use one universal tolerance for every SUS201 sheet or coil. Dimensional limits depend on factors such as nominal thickness, width, product form, edge condition, and whether the material is supplied as sheet, strip, or coil.

For an inquiry, it is safer to provide the exact nominal dimensions rather than writing only “G4305 tolerance.” A practical request can specify thickness × width × length for sheets or thickness × width × coil weight for coils, followed by the required edge and surface condition.

SUS201 Supply Forms: Sheet, Coil and Strip

JIS G4305 is especially relevant when the buyer needs cold-rolled flat products. The same grade can therefore appear in several commercial supply forms, but the downstream processing requirements are different.

For coil buyers, the term “coil” describes the delivery format. The technical requirement still needs to identify the applicable JIS product specification, grade, dimensions, finish, and condition.

JIS SUS201 vs ASTM 201: Data-Line Comparison

JIS SUS201 and ASTM Type 201 are closely related grade designations, but the standards should not be treated as interchangeable documents. The governing product standard determines the acceptance requirements.

The comparison shows why a buyer should not simply replace “JIS G4305” with “ASTM 201.” Even when the chemistry looks similar, the mechanical and dimensional acceptance rules belong to different standards.

Japanese-Style Purchasing Checklist

For Japanese customers, the inquiry should be more detailed than “SUS201 stainless steel sheet.” A clear request reduces the chance of receiving a commercially similar but technically different product.

How to Verify a JIS Certificate

A JIS certificate should be checked against the actual coil or sheet, not only against the supplier quotation. The most important fields are the grade, standard, heat number, chemical analysis, mechanical test results, product dimensions, surface condition, and traceability.

SUS201 JIS Stock and Inquiry Support

For buyers who need Japanese-standard material, Teda Ganghua can support SUS201 sourcing with attention to grade, product form, dimensions, surface finish, inspection documents, and shipment traceability. For recurring procurement, the technical specification can also be kept consistent across coils, sheets, and slit strips.

When requesting a quotation, buyers can provide the required JIS grade, size, surface, quantity, delivery form, and certificate requirements together. This makes it easier to distinguish genuine JIS requirements from generic 201 stainless offers. You can review the available stainless steel products and use the same specification structure for your inquiry.

FAQ: SUS201 JIS G4305 Stainless Steel

Is SUS201 the same as 201 stainless steel?

SUS201 is the JIS designation for Grade 201. However, “201 stainless steel” is a broad commercial term. A purchase order should state the governing product standard, because different standards can have different mechanical, dimensional, and inspection requirements.

Does JIS G4305 cover SUS201 coil?

Yes. JIS G4305 covers cold-rolled stainless steel plate, sheet, and strip. Coil is commonly used as a delivery form for strip or sheet products, so the order should still identify the applicable product dimensions and requirements.

Is 2B available for SUS201?

Yes. 2B is a common cold-rolled surface condition for SUS201. BA is also used where a brighter surface is required. The exact finish should be stated in the purchase specification.

Can ASTM 201 replace JIS SUS201 automatically?

No. The grades are closely related, but ASTM and JIS are separate standards. If the customer requires JIS G4305, the supplier should provide material certified to that requirement rather than assuming that an ASTM certificate is automatically equivalent.

What should be included in a SUS201 inquiry?

At minimum, specify SUS201, JIS G4305, product form, thickness, width, length or coil dimensions, surface finish, edge condition, quantity, delivery requirement, and the requested JIS mill test certificate.