Excerpt:
Unequal-leg angles provide different attachment widths for brackets, frames and edge supports where the drawing needs an asymmetric L-section. SS400 is a general structural steel grade. Specify the required material standard and dimensional series together rather than substituting by a similar-looking metric size.
QIDA METAL · MATERIALS & EXPORT SUPPLY
JIS SS400 Unequal Leg Steel Angle
Unequal-leg angles provide different attachment widths for brackets, frames and edge supports where the drawing needs an asymmetric L-section. SS400 is a general structural steel grade. Specify the required material standard and dimensional series together rather than substituting by a similar-looking metric size.
| Ordering item | Specification |
|---|---|
| Material / standard | JIS G3101 material / JIS G3192 geometry where ordered |
| Product family | Angles |
| Supply basis | Enquiry-based grade, dimensions, processing and quantity; availability, MOQ and delivery confirmed in the quotation. |
| Inspection documents | Request heat/batch records and EN 10204 3.1 or other documents where required; actual document scope must be confirmed. |
01 / Selection Advantages
- Clear leg/thickness notation helps prevent procurement and cutting-list errors.
- Cutting, holes and coating preparation can be reviewed with the buyer’s fabrication drawings.
- JIS-specific grade review avoids an unsupported assumption of equivalence to EN grades.
02 / Specifications & Size Schedule
Use the following options to prepare a complete enquiry. The lists do not imply that every dimension combination is stocked or interchangeable with another standard. State the required tolerances and quantity for each line.
| Parameter | Enquiry requirement |
|---|---|
| Section notation | Long leg A × short leg B × thickness t |
| Requested length / m | 6, 9, 12 or agreed cut lengths |
| Surface | As rolled; preparation/paint/galvanizing by separate agreement |
| Dimensional acceptance | Agree standard edition, leg/thickness tolerance and straightness |
| Chemistry control | SS400 does not prescribe C/Si/Mn limits in the referenced grade table |
| A × B / mm | Thickness enquiries / mm |
|---|---|
| 75 × 50 | 6, 7, 9 |
| 90 × 75 | 9 |
| 100 × 75 | 7, 10 |
| 125 × 75 | 7, 10 |
| 125 × 90 | 10, 13 |
| 150 × 90 | 9, 12 |
| 150 × 100 | 9, 12, 15 |
| 200 × 100 | 10, 15 |
03 / Chemical Composition
Composition is expressed in weight percent. Maximum and minimum limits refer to the listed grade/product reference; final acceptance follows the agreed standard edition and heat analysis.
| Element | Grade reference / wt.% |
|---|---|
| C | Not specified by JIS G3101 for SS400 |
| Si | Not specified |
| Mn | Not specified |
| P | ≤0.050 |
| S | ≤0.050 |
| Fe | Balance |
04 / Mechanical Properties & Technical Notes
| Thickness / mm | Min yield / MPa | Tensile / MPa | Elongation reference |
|---|---|---|---|
| t ≤16 | 245 | 400–510 | 17% with No.1A specimen for 5 < t ≤16; specimen/size provisions apply |
| 16 < t ≤40 | 235 | 400–510 | 21% with No.1A specimen; confirm actual section thickness |
The table is a selected enquiry schedule, not a complete JIS availability declaration. Confirm the rolled series and actual thickness combination before order. SS400 does not carry a general Charpy impact requirement; projects requiring impact performance need a suitable specification rather than an assumed JR/J0/J2 equivalence.
05 / Processing & Inspection
| Control point | What to agree or inspect |
|---|---|
| Geometry | Measure both legs, thickness, length, out-of-square and straightness. |
| Identity | Match JIS grade, heat and ordered dimensions to material records. |
| Processing | Agree saw cuts, drilling, marking and surface preparation from drawings. |
| Welding/design | Request additional chemistry/carbon-equivalent controls if required by the welding procedure. |
Include additional tests, third-party inspection, marking transfer and processing requirements before order confirmation. Qida can coordinate the agreed inspection scope and supporting records; an online product guide is not a delivered-batch test certificate.
06 / Export Packaging & Transport
| Packing item | Practical requirement |
|---|---|
| Size segregation | Bundle sections by size/grade/length and transfer clear heat/order labels. |
| Protection | Use suitable spacers, strap guards and dry supports; separate finished faces. |
| Handling | Agree bundle weight, sling positions and access for the destination equipment. |
| Loading plan | Support long sections, distribute mass and secure against sliding and tipping. |
Agree destination port, Incoterms rule and named place, package mass, unloading equipment and required shipping documents. Container capacity depends on payload limits, route and load distribution. For regulated solid-wood packaging, confirm the applicable ISPM 15 treatment and marking requirements.
07 / Qida Procurement Support
| Order stage | Our coordination | Buyer benefit |
|---|---|---|
| Specification review | Review material, dimensions, units, drawings and destination requirements. | A clear line-by-line enquiry helps reduce omissions and incompatible substitutions. |
| Processing plan | Confirm cutting, finishing, inspection and identification items in writing. | The buyer can assess scope and acceptance before production or sourcing proceeds. |
| Packing & dispatch | Coordinate labels, packing list, suitable protection and shipping-document requirements. | Piece count and heat/lot correspondence can be checked at agreed milestones. |
| After-sales follow-up | Review order references, arrival photos and inspection records for reported issues. | A documented issue description supports a specific response and follow-up. |
08 / Request a Detailed Quotation
Send the standard and edition, grade, size schedule, quantity per size, material condition, finish, processing drawings, tests/documents, packing requirements and destination port. Include maximum piece or package weight and any project approval requirements. Pricing, minimum quantity and lead time will be confirmed against the actual requirement.
Shandong Qida Metal Technology Co., Ltd. · Liaocheng, Shandong, China
qidamt@163.com · +86 139 6951 8618
Technical References
The primary references below support material selection and enquiry preparation. They do not certify a delivery batch or imply an affiliation with their publishers. Product form, condition, standard edition and supplementary requirements must be agreed in the purchase specification.
