AISI H12 | 1.2605 | X35CrWMoV5 | SKD62
AISI h12 tool steel is a 4.75~5.5% chromium, general-purpose hot work steel. H12 tool steel contains (0.2~0.5%) less vanadium than the widely-used H13 hot works tool steel (0.8~1.2%). ASTM/AISI H12 Steel is a deep-hardening, air-hardening steel that exhibits minimal size change during heat treatmnet.
Description
AISI H12 Steel Grade
| Country | USA | German | Japan |
| Grades | H12/T20812 | 1.2605/X35CrWMoV5 | SKD62 |
H12 Tool Steel Chemical Composition(%)
| Steel Grade | C | Si | Mn | P | S | Cr | Mo | V |
| H12/T20812 | 0.30/0.40 | 0.80/1.25 | 0.20/0.60 | ≤0.030 | ≤0.030 | 4.75/5.50 | 1.25/1.75 | 0.20/0.50 |
| 1.2605/X35CrWMoV5 | 0.32/0.40 | 0.80/1.20 | 0.20/0.50 | ≤0.030 | ≤0.020 | 4.75/5.50 | 1.25/1.60 | 0.20/0.50 |
| SKD62 | 0.32/0.40 | 0.80/1.20 | 0.20/0.50 | ≤0.030 | ≤0.020 | 4.50/5.50 | 1.00/1.60 | 0.20/0.50 |
Supply Range
Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.
Forged Round Bar: 20mm - 650mm (Dia)
Rolled Bars: 12mm - 360mm (Dia)
Forged flats: 30-400mm(T)*500-1200mm(W)
Rolled flats: 10-360mm(T)*30-1020mm(W)
Other sizes of O1 material or as per customer’s requirements.
AISI H12 Tool Steel Heat Treatment
Annealing
Heating Steel H-12 slowly and uniformly to 845~900℃, furnace cooling to 540℃ at a rate 10~20℃/hr. Hardness HB 229 max
Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating H12 steel to approx.650oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Hardening
Preheating (1): Heat H-12 steel to approx. 540~650℃, holding 30 minutes per 25mm.
Preheating (2): Heat H12 tool steels to approx. 845~870℃, holding 30 minutes per 25mm.
Austenitizing: Heat steel H12 to approx. 1010~1050℃, holding 30 minutes per 25 mm.
Quenchant: By oil or air.
Tempering
Tempering temperature: 520-700oC, hold at least 2 hours, air cooling and double tempering.
Applications of AISI H12 Tool Steel
AISI H12 hot work tool steel is usually used for hot tooling applications where maximum resistance to cracking is required. Such typical applications include the following:
Extrusion indushry: dies and inner liner for extrusion, extrusion tools
Forging Industry: forming dies, press dies
Die casting industry: dies for die-carbide
Tool Industry: hot punch, hot shear blades, immediate roller for cold rolling
