Quick Details
1: AISI H12 steel introduction
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. H12 tool steel material has good resistance to thermal fatique cracking (heat cracking) and excellent resistnce to gross cracking and thermal shock when water cooled in service. So, we could say H-12 tool steel mainly has the following characteristics:
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Excellent resistance to wear, high strength at elevated temperature.
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Good homogenizing with high toughness.
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Extra- fine- structure without grain-boundary carbide.
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Inclusion shape controlled with high cleanliness.
2: AISI H12 Steel equivalent
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Country
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China
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Japan
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Germany
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USA
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UK
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Standard
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GB/T 1299
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JIS G4404
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DIN EN ISO4957
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ASTM A681
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BS 4659
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Grade
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SKD62
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1.2605/X35CrWMoV5
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H12/T20812
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BH12
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3: AISI H12 steel chemical composition
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Grade
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C
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Mn
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P
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S
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Si
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Cr
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V
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W
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Mo
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Ni
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Cu
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Sn
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H12/
T20812
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0.30
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0.4
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0.2
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0.6
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0.03
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0.03
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0.80
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1.25
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4.75
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5.50
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0.2
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0.5
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1.00
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1.70
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1.25
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1.75
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…
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…
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…
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1.2605
/X35Cr
WMoV5
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0.32
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0.4
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0.2
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0.5
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0.03
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0.02
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0.80
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1.20
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4.75
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5.50
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0.2
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0.5
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1.10
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1.60
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1.25
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1.60
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…
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…
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…
|
|
SKD62
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0.32
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0.4
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0.2
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0.5
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0.03
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0.02
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0.80
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1.20
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4.50
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5.50
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0.2
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0.5
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1.00
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1.60
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1.00
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1.60
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…
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…
|
…
|
|
BH12
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0.30
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0.4
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…
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0.4
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0.35
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0.35
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0.85
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1.15
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4.75
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5.25
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…
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0.5
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1.25
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1.75
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1.25
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1.75
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0.4
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0.2
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0.05
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4: AISI H12 steel mechanical properties
The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.
5: AISI H12 steel overviews
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Size
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Round
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Dia 6-1200mm
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Plate/Flat/Block
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Thickness
6mm-500mm
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Width
20mm-1000mm
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Process
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EAF+LF+VD+Forged+Heat treatment(optional)
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Heat treatment
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Normalized ; Annealed ; Quenched ; Tempered
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Surface condition
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Black; Peeled; Polished; Machined; Grinded; Turned; Milled
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Delivery condition
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Forged; Hot rolled; Cold drawn
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Test
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Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc.
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Payment terms
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T/T;L/C;/Money gram/ Paypal
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Trade terms
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FOB; CIF; C&F; etc..
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Packing
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Standard packages or as per customers request.
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Delivery time
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30-45 days
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Application
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AISI H12 tool steel are suitable for Extrusion indushry: dies and inner liner for extrusion, extrusion tools Forging Industry: forming dies, press dies Die casting industry: dies for die-carbideTool Industry: hot punch, hot shear blades, immediate roller for cold rolling etc..
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6. 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.
Quenching: By oil or air.
Tempering
Tempering temperature: 520-700oC, hold at least 2 hours, air cooling and double tempering.
7: Delivery condition
For hot forged or hot rolled bar, usually the delivery condition is hot forged or rolled, annealed, rough turned.
For hot forged plate, usually the delivery condition is hot forged, annealed, milled surface.
For hot rolled plate, usually the delivery condition is hot rolled, annealed, black surface.
