H10 Tool Steel is one hot works tool steel in ASTM A681 standard, which is for alloy tool steel. The ASTM/AISI classifies chromium hot work tool steels as group H steels, ranging from H10, H11, H12 to H19. AISI H10 Tool Steel is one of chromium hot-work tool steel that exhibits excellent resistance to softening at elevated temperature.
H10 Tool Steel is capable of being heat treated to higher hardness than the tungsten hot work steels, and in addition offers greater toughness. H10 tool steel has good thermal fatigue characteristics, and unlike the tungsten hot work steels and H10 hot work tool steels may be safely water cooled in service.
H10 hot works tool steel is recommended for difficult hot work tooling applications such as hot punches, die casting dies, forging dies, hot shear blades, hot gripper dies, and extrusion tooling etc.
1.ASTM H10 Tool Steel Supply Range
H10 Steel Round Bar: diameter 8mm–800mm
H-10 Steels Flat: thickness 16-500mm x width 200-800mm
H10 Steels Plate: thickness 16-500mm x width 200-810mm
Other dimension according to your requirements
Surface Finish: Black, Rough Machined, Peeled, Turned or as per given requirements.
2.H10 Steel Standard and Relevant Steel Specifications
| Country | USA | German | Japan | British |
| Standard | ASTM A681 | DIN EN ISO 4957 | JIS G4404 | BS 4659 |
| Grades | H10/T20810 | 1.2365/32CrMoV12-28 | SKD7 | BH10 |
3.ASTM H10 Tool Steel and Equivalents’ Chemical Composition
| ASTM A681 | C | Mn | P | S | Si | Cr | V | W | Mo | |||||||
| H10/T20810 | 0.35 | 0.45 | 0.20 | 0.70 | 0.03 | 0.03 | 0.80 | 1.25 | 3.00 | 3.75 | 0.25 | 0.75 | … | … | 2.00 | 3.00 |
| DIN ISO 4957 | C | Mn | P | S | Si | Cr | V | W | Mo | |||||||
| 1.2365/32CrMoV12-28 | 0.28 | 0.35 | 0.15 | 0.45 | … | … | 0.10 | 0.40 | 2.70 | 3.20 | 0.40 | 0.70 | … | … | 2.50 | 3.00 |
| JIS G4404 | C | Mn | P | S | Si | Cr | V | W | Mo | |||||||
| SKD7 | 0.28 | 0.35 | 0.15 | 0.45 | 0.03 | 0.03 | 0.10 | 0.40 | 2.70 | 3.20 | 0.40 | 0.70 | … | … | 2.50 | 3.00 |
| BS 4659 | C | Mn | P | S | Si | Cr | V | W | Mo | |||||||
| BH10 | 0.30 | 0.40 | … | 0.40 | 0.35 | 0.35 | 0.75 | 1.10 | 2.80 | 3.20 | 0.30 | 0.50 | … | … | 2.65 | 2.95 |
4.Hot Work Tool Steel H10 Mechanical Properties
Physical Properties of High Speed H10 Tool Steels
- Critical temperature – (on heating) 1525°F
- Specific gravity – 7.80
- Coefficient of Thermal Expansion
100 – 800°F 6.78 x 10-6 in/in/°F
100 – 1000°F 7.41
100 – 1200°F 7.65
Mechanical of hot work H10 steel
| Properties | Metric | Imperial |
| Hardness, Rockwell C (air cooled from 1024°C and double tempered; 649°C temper temperature) | 41 | 41 |
| Hardness, Rockwell C (air cooled from 1024°C and double tempered;149°C temper temperature) | 58 | 58 |
| Modulus of elasticity | 207 GPa | 30000 ksi |
| Machinability (1% carbon steel) | 90.0 – 95.0% | 90.0 – 95.0% |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
5.Forging of H10 Tool Steel Materials
Heating for forging of H10 steel must be done slowly and uniformly. Soak through at 1037°C -1093°C, and reheat as often as necessary, stopping work when the temperature drops below 898°C. After forging cool slowly in lime, mica, dry ashes or furnace. H10 tool steel should always be annealed after forging.
6.AISI H10 Tool Steel Heat Treatment
Annealing of H-10 tool steel
Heating slowly and uniformly to 750~790℃, furnace cooling to
600℃ at a rate 10~20℃/hr, further cooling in air. Hardness after annealing: max. 205 HB. Suitable precautions must be taken to prevent excessive carburization or decarburization.
Stress relieving of tool steel H10
600 to 650°C (1112 to 1202°F) Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After through heating, hold in neutral atmosphere for 1 -2 hours.
Hardening of hot work H10 steel
H10 steel is a very deep hardening steel, and although oil quenching may be used where maximum hardness is required, air hardening is recommended for most applications. The use of salt bath or controlled atmosphere furnace is desirable to minimize decarburization, and if not available, pack hardening spent pitch temperature employed is usually in the range of 982°C -1037°C.
1010 to 1050°C (1850 to 1922°F) Oil, salt bath (500-550°C / 932-1022°F), Holding time after temperature equalization: 15 to 30 minutes. Obtainable hardness: 52 -56 HRC
Tempering of H10 steels
Slow heating to tempering temperature immediately after hardening / time in furnace 1 hour for each 20 mm of work piece thickness but at least 2 hours / cooling in air. It is recommended to temper at least twice. A third tempering cycle for the purpose of stress relieving may be advantageous 1st tempering approx. 30°C (86°F) above maximum secondary hardness. 2nd tempering to desired working hard-ness. The tempering chart shows average tem-pered hardness values. 3rd for stress relieving at a temperature 30 -50°C (86 to 122°F) below highest tempering temperature
7.Applications of AISI H10 Tool Steel
H10 tool steel is generally used for highly stressed hot work tools, mainly for the processing of heavy alloys, such as:
- Extrusion Industry: Dies, Inner Liners, Stems, Pressure Pads, Mandrels for Extrusion
- Forging Industry: Forming Dies, Press Dies, Pressing Mandrels
- Die Casting Industry: dies for die-casting, die inserts, hot shear blades, moulds for processing brass and light metal
Besides H10 hot work tool steel, we also supply H11, H13, H21 hot work tool steel for your hot works tools applications. Please just send your requests with details.
