24 July 2021 Hardware Tool Steel Sheet
AISI H11 (DIN 1.2343)Hardware Tool Steel Sheet
AISI H11 (DIN 1.2343) is one of the hot work chromium type tool steels belong to ASTM A681 standard. It has good strength in high temperature, excellent toughness and ductility in all z directions, excellent hardenability, and a high level of thermal shock and thermal fatigue resistance. AISI H11 steel can be deeply hardened by heat treatment and air quenching.
Compare to AISI H13 , AISI H11 tool steel is with less vanadium than these too grade steel. This gives AISI H11 steels higher toughness, with some reduction in wear resistance and temper resistance. AISI H11 tool steel is a deep-hardening, air-hardening steel and AISI H11 alloy steel could be deep hardened by heat treatment and air-quenching. That gives minimal size change during heat treatment. AISI H11 how work steel also has super resistance to thermal fatigue cracking and superb resistance to gross cracking and thermal shock when water cooled in service.
AISI H11 steel is also used for hot tooling applications, thanks to its excellent resistance to cracking, including thermal fatigue cracking, gross cracking and thermal shock during water cooling. These include hot punches, die casting dies, forging dies, hot shear blades, hot gripper dies, and extrusion tooling. Like most steels with high toughness and low carbon content, AISI H11 steel can be used for producing hot-work steels with the water-cooling method.
Chemical Composition:
| Element | Min (%) | Max (%) |
| Carbon, C | 0.38 | 0.43 |
| Manganese, Mn | 0.20 | 0.40 |
| Silicon, Si | 0.80 | 1.00 |
| Sulfur, S | – | 0.015 |
| Phosphorus, P | – | 0.015 |
| Chromium, Cr | 4.75 | 5.25 |
| Molybdenum, Mo | 1.20 | 1.40 |
| Vanadium, V | 0.40 | 0.60 |
| Nickel, Ni | – | 0.25 |
| Copper, Cu | – | 0.35 |
| Iron, Fe | – | *Balance |
Physical Properties:
| Physical Property | Imperial | Metric |
| Density | 0.282 lb/in³ | 7.81 g/cc |
| Melting Point | 2600°F | 1427°C |
| Tensile Strength | 260 ksi | 1792 MPa |
| Tensile Strength, Yield | 215 ksi | 1482 MPa |
| Elongation in 4D | 8 % | 8 % |
| Reduction of Area | 30 % | 30 % |
| Hardness, Rockwell C Air cooled from 1800°F (982°C) for 45 minutes) | 52.5 | 52.5 |
| Hardness, Rockwell C Air cooled from 1850°F (1010°C) for 45 minutes) | 56 | 56 |
| Hardness, Rockwell C Air cooled from 1900°F (1038°C) for 45 minutes) | 57 | 57 |
| Charpy impact V-notch; air-cooled from 1850°F (1010°C) and then tempered at 535°C | 10.0 ft-lb | 13.6 J |
| Charpy impact V-notch; air-cooled from 1850°F (1010°C) and then tempered at 1200°F (650°C) | 20.0 ft-lb | 27.1 J |
| Charpy impact V-notch; air-cooled from 1850°F (1010°C) and then tempered at 700°F (370°C) | 25.0 ft-lb | 33.9 J |
| Poisson’s Ration | 0.27 – 0.30 | 0.27 – 0.30 |
| Machinability (relative rating for 1% Carbon Steel) | 75-80 % | 75-80 % |
Heat Treatment:
AISI H11 can be heat treated using various different schemes that give different properties. Heat treatments of this alloy usually consist of annealing, hardening/austenitizing, air and oil quenching, and single or double tempering at temperatures of 840° F (450° C), 930° F (500° C), 1020° F (550° C), 1110° F (600° C), and 1200° F (650° C).
According to some independent studies, the optimum heat treatment for a combination of hardness, toughness, yield strength, ultimate strength, and ductility include oil-quenching and double-tempering at 1020° F (550° C). Higher hardness can be achieved by oil-quenching and double tempering at 1110° F (600° C), but this can also lead to lower lead strength and very low ductility. Also, with the increase of hardness of Tool Steel H11, impact toughness decreases.
Property After Heat Treatment:
| Soft Annealing °C | Cooling | Hardness HB |
|---|---|---|
| 750 - 800 | Furnace | Max. 230 |
| Stress-Relief Annealing °C | Cooling |
|---|---|
| Approx. 600 - 650 | Furnace |
| Hardening °C | Quenching | Hardness After Quenching HRC |
|---|---|---|
| 1000 - 1030 | Air ,oil or saltbath, 500 - 550 °C | 54 |
| Tempering °C | 100 | 200 | 300 | 400 | 500 | 550 | 600 | 650 | 700 |
| HRC | 52 | 52 | 52 | 52 | 54 | 53 | 48 | 37 | 31 |
Fabrication and Working:
AISI H11 can be easily formed using conventional methods for machining and forging. For forging the preferred temperature is 2050° F (1121° C), with 1650° F (899° C) being the lowest recommended point. H11 can also be cold-worked and welded with conventional methods for steels in this group. That said, machinability of H11 is 75% to that of steels in the “W” group.
Heat Treatment Curve:
