The high quality USA AISI Grade21 material is one of the more steel grades we supply, . Grade21 is our main production grade, which has been approved by customers in many countries since its initial production, including our Grade21 round bars, flat bar, forgings, fasteners, tubes, wires, strips, sheets & Plates, as well as a variety of profiles, professional high precision auto-lathe processing manufacturer of clinching fasteners, axes, standoffs, screws, studs, nuts, bolt, OEM parts and special shaped turning partsthe state of delivery includes quenched and tempered, annealed, machined semi-finished products, we also have strict management of the packaging, to avoid material damage from transportation. We are the best supplier of Grade21 materials, and we are willing to develop together with customers from all over the world.
Also includes Grade21 steel material norm, chemical composition, mechanical properties, datasheet, Grade21 equivalent, heat treatment and temperature process of Grade21, The peak hardness can be achieved, Contains all of the specification, welding properties, let us in Grade21 this steel grade have a more comprehensive understanding, Download the full Grade21 PDF version of this datasheet.
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Ni(％) | Mo(％) |
|---|---|---|---|---|---|---|---|
| 0.20-0.30 | Max 1.00 | Max 1.00 | Max 0.040 | Max 0.040 | 25.0-29.0 | 1.75-3.75 | 5.0-6.0 |
| B(%) | Other(%) | ||||||
| Max 0.007 | Fe Max 3.00 |
| Rp0.2 (MPa) | Rm (MPa) | Impact KV (J) |
Elongation A (%) |
A Z (%) | Delivery | Hardness HB |
|---|---|---|---|---|---|---|
| 619 (≥) | 366 (≥) | 13 | 43 | 33 | Solution & Aging, Ann, Ausaging, Q+T | 242 |