Otai A4 steel material
A4. Material for cold-forging and blanking dies, shear blades and cutting knives. Carbon composition: 0.95–1.05 %; Manganese composition: 1.80–2.20 %.
Specifications
| Attribute | Value | Conditions | Source |
|---|---|---|---|
| Carbon composition | 0.95–1.05 % | Supplier published chemical-composition percentage; exact A4 table, percentage basis not separately stated; not a batch assay or mill certificate | Otai A4 original grade composition and application page |
| Manganese composition | 1.80–2.20 % | Supplier published chemical-composition percentage; exact A4 table, percentage basis not separately stated; not a batch assay or mill certificate | Otai A4 original grade composition and application page |
| Chromium composition | 0.90–1.20 % | Supplier published chemical-composition percentage; exact A4 table, percentage basis not separately stated; not a batch assay or mill certificate | Otai A4 original grade composition and application page |
| Molybdenum composition | 0.90–1.40 % | Supplier published chemical-composition percentage; exact A4 table, percentage basis not separately stated; not a batch assay or mill certificate | Otai A4 original grade composition and application page |
Sources and updates
Scope of this page: One named steel grade offering; AISI/DIN/JIS aliases, round/flat/plate stock, dimensions, surface finish and heat-treatment options are not extra products. Chemical composition is a supplier reference, not independently assayed or a guarantee of conformance to an unreviewed standard edition. No generic heat-treatment recipe, unconditioned hardness, service-temperature limit or safety approval adopted. The supplier is identified without claiming original trademark ownership or an endorsed distribution relationship.
Otai A4 original grade composition and application page
Original publication · Otai
Source accessed: 27 October 2026
Content updated 27 October 2026. Source dates describe the documents or the recorded access to them.
How information is documented