OTAI SPECIAL STEEL is H21 tool steel stockholders and suppliers from china in AISI H21 tool steel round bar, flat bar and plate supply.
Sae AISI H21 tool Steel is a high quality Hot work tool steel, It belong to the high quality high carbon alloy tool steel. Oil Quenched & Tempered Hardenss is 28-34 HRc. AISI H21 steel Annealing delivery hardenss less than 250HB.
Related Specifications ASTM A685 DIN EN 17350 JIS G4404 GB/T 1299 AISI H21 HOT WORK TOOL STEEL PDF DATA DOWN
Form of Supply
ASTM AISI H21 tool steel, we can supply the round bar, steel flat bar, plate, steel sheet, hexagonal steel bar and steel square block. AISI H21 steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. H21 steel Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.
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- Round
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- Square
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- sheet
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- Plate
Chemical composition
| C(％) | 0.26~0.36 | Si(％) | 0.10-0.50 | Mn(％) | 0.15-0.40 | P(％) | ≤0.030 |
| S(％) | ≤0.30 | Cr(％) | 3.00-3.75 | V (％) | 0.30~0.60 | W(％) | 8.5~10.0 |
Material equivalent of H21 steel
| USA | Germany | China | Japan | France | England | Italy | Poland | Czechia | Austria | Sweden | Spain |
| AISI/UNS | DIN,WNr | GB | JIS | AFNOR | BS | UNI | PN | CSN | ONORM | SS | UNE |
| H21 / T20821 | X30WCrV9-3 | 1.2581 | 3Cr2W8V | SKD5 | X30WCrV9 | BH21 | X30WCRV93KU | 2730 | X30WCRV9 | |||
H21 steel Heat treatment Related
- Forging Of H21 steel-hot work alloy tool steel
Heat to 900-1100 °C(1652-2012°F)，forged temperature not below 843°(1550°F)
- Annealing of H21 Tool steel
Slowly heated to 800~850 ℃（1472~1562°F） and allow enough times, let the steel to be thoroughly heated, Then cool slowly at Maximum of 4°C（40°F）per hours. The H21 tool steel will get MAX 235 HB （Brinell hardness）.
- Hardening of H21 tool steel
H21 steels should be heated uniformly to 1050-1100°C (1922-2012°F) until completely heated through. If needed, the steels can be preheated at 300-500°C (572-932°F). About 30 min/per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in air.
- Tempering of H21 tool steel
Tempering of H21 steels is performed at 600-650°C (212-662°F), Soak well at the selected temperature and soak for at least one hour per 25mm of total thickness. Get Rockwell C hardness of 50 MAX..
Mechanical Properties
The mechanical properties of H21 tool steels are outlined in the following table.
| Elastic modulus (@399°C/750°F, hardened to 62 HRC ) |
Elastic modulus (hardened to 62 HRC) | Yield (0.2%, hardened to 55 HRC) |
Yield (0.2%, hardened to 60 HRC) |
Yield (0.2%, hardened to 62 HRC) |
Yield (0.2%,hardened to 50 HRC) |
| GPa | GPa | Mpa | Mpa | Mpa | MPa |
| 172 | 193 | 1800 | 2150 | 2200 | 1350 |
Applications of H21 Tool Steel-Tungsten Hot-Work Steel
H21 Hot work steels are Suitable for the manufacture of complex shapes, impact load, the working temperature is not too high, mold sheet product is suitable for forging press mold, concave and convex die, die casting, hot metal cutting knife, etc. the mass production with aluminum alloy die-casting mould.
H21 tool steel Regular size and Tolerance
hot rolled H21 steel bar: Ø5mm-200mm
Forging H21 steel bar: Ø140mm-3000mm
Hot rolled H21 steel plate: Thickness 10mm-200mm x width 100-2300mm
Forged H21 material steel plate: Thickness 150-1500mm x Width 100 x 3000mm
Others H21 have not specified size, pls contact our experienced sales team.
Processing
JIS H21 tool steel round bar and flat sections can be cut to your required sizes. H21 tool steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. JIS H21 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.
Contact our experienced sales team to help you with your H21 tool steel questions And enquiry by Email or Telphone. The questions will be reply in 24 hours.
OTAI SPECIAL STEEL CO., LTD
Email: jack@otaisteel.com TEL: 0086-769-33232622 FAX: 0086-769-88705839
