SS400 Steel: Verify the JIS Product Scope Before Comparing Grades
SS400 is not a complete structural purchase decision. JSA lists JIS G 3101:2024 as current, while the drawing and project rules decide the required form, dimensions and evidence. ZIVO can discuss an SS400 hot-rolled coil enquiry, but exact availability and specification are confirmed for the order.
- Designation
- SS400
- Family
- Non-alloy steel
Edition
Identify the governing JIS revision
Form
Name coil, sheet, section or other ordered form
Condition
Specify dimensions and delivery state
Approval
Keep structural decisions with the engineer
Identify SS400 in the Current JIS Context
Begin with the approved drawing and material schedule: copy the SS400 callout, the governing standard number and edition, and the structural function of the part. JSA lists JIS G 3101:2024 for rolled steels for general structure. That establishes which document to consult; it does not replace the project's design specification.
Keep three decisions separate: whether the offered material matches the ordered product, whether its test evidence matches the contract, and whether an engineer has approved it for the structure. A grade name alone closes none of them.
Check the Exact JIS Product Form
Name the exact required product form before comparing quotes. The official JIS scope covers hot-rolled structural steel products and hot-extruded sections, but a coil quotation cannot be used to satisfy a section or plate drawing without a separate form and design review. State whether the project requires hot-rolled coil, cut sheet, plate, bar or section, and confirm the applicable clauses in the full current standard.
Ask the seller to repeat the proposed form on the offer. If the form differs from the drawing, stop the comparison at that point and get the responsible engineer's decision.
Record Thickness, Condition and Ordered Tests
Prepare one order line that both the purchaser and seller can check: standard edition, SS400 designation, product form, dimensions, tolerance basis, delivery condition, intended processing and required inspection document. List any project-specific tests separately.
The accessible official preview does not expose all form- and dimension-specific requirements. Do not lift a property number from a mill catalogue into a universal SS400 guarantee; confirm the applicable clause and the actual mill certificate for the quoted lot.
Have a Specification Ready?
Send what you already know, such as grade, finish, size or quantity. Inquiries are answered within 2 hours.
Compare Alternatives Clause by Clause
If a different grade is proposed, compare the two exact standards and editions under the same product form and thickness. Record the delivery condition, specified tests, design code and the person authorized to approve a change. Do not decide from a similar grade name or a single headline strength figure.
| Decision field | Keep the original requirement | Record the proposal |
|---|---|---|
| Document | Standard, edition and project code | Proposed document and edition |
| Product | Form, dimensions and delivery state | Actual quoted form and state |
| Evidence | Ordered tests and certificate type | Available lot-specific evidence |
| Approval | Named engineering authority | Written decision before any change |
This matrix organizes the review; it does not declare two grades equivalent.
Separate Material Evidence from Design Approval
At receipt, match the material identification and inspection document to the purchase order. Check the reported grade, edition, form, dimensions, delivery state and ordered test entries. Record a mismatch before accepting the lot for fabrication.
An inspection document is evidence about the delivered material and recorded tests. It is not a structural-design certificate or a welding-procedure approval. The project engineer must decide whether the actual documented material is suitable for the specified structure and fabrication route.
Use the Hot-Rolled Coil Family Only as a Starting Point
ZIVO's approved business route includes SS400 hot-rolled coil enquiries. Use the published hot-rolled coil family page to send the drawing, required JIS edition, coil dimensions, surface/condition, quantity, destination and inspection-document requirements. We confirm the exact feasible configuration against the individual request; this page publishes no fixed SS400 size band, stock or lead time.
Frequently Asked Questions
No. Name the exact form and dimensions from the approved drawing and check the applicable JIS clauses for that order.
A change needs a comparison of exact editions, forms, dimensions, conditions and project tests, followed by the responsible engineer’s approval. A short grade name is insufficient.
Yes, as a scoped hot-rolled coil enquiry. Send the form, drawing, edition, dimensions, condition and tests; exact availability and specification are confirmed for that order. This does not extend the offer to every SS400 form.
Tell Us What You Need
Send the product form, grade, finish, thickness, width, length and quantity. Inquiries are answered within 2 hours.
Send Your Inquiry
Name, email and your inquiry are all that is needed. Add a WhatsApp number if you prefer to chat.
- Email: henry@zivosteel.com
- WhatsApp: +86 15668396618
- Address: 2F, Vanke Center, Lixia District, Jinan, Shandong, China
- Hours: Monday to Saturday, 8:00-18:00 (China time)