1: JIS SKD7 steel introduction
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.
2: JIS SKD7 steel equivalent
| Country | China | Japan | Germany | USA | UK |
| Standard | GB/T 1299 | JIS G4404 | DIN EN ISO4957 | ASTM A681 | BS 4659 |
| Grade | SKD7 | 1.2365/32CrMoV12-28 | H10/T20810 | BH10 |
3:JIS SKD7 steel chemical composition
| Grade | C | Mn | P | S | Si | Cr | V | 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 |
| 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 |
| 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 |
| 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: JIS SKD7 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:JIS SKD7 steel overviews
| Size | Round | Dia 6-1200mm | |
| Plate/Flat/Block | Thickness 6mm-500mm | ||
| Width 20mm-1000mm | |||
| Process | EAF+LF+VD+Forged+Heat treatment(optional) | ||
| Heat treatment | Normalized ; Annealed ; Quenched ; Tempered | ||
| Surface condition | Black; Peeled; Polished; Machined; Grinded; Turned; Milled | ||
| Delivery condition | Forged; Hot rolled; Cold drawn | ||
| Test | Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. | ||
| Payment terms | T/T;L/C;/Money gram/ Paypal | ||
| Trade terms | FOB; CIF; C&F; etc.. | ||
| Delivery time | 30-45 days | ||
| Packing | Standard Packages, or as Customers Request | ||
| Application | ASTM H10 tool steel are suitable 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 | ||
6.Heat Treatment
Annealing
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
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
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
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: 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.
We are professional manufacturer for many years. we can provide a wide range of steel products.
Usually bundling for large diameter,small diameter bars in bulk or as customer's demand.
The hardness after heat treatment is higher than D2/1.2379/Cr12Mo1V1, and can reach 61-63HRC after high-temperature tempering (525 ± 5 ℃); In terms of strength and wear resistance, it exceeds Cr12Mo1V1, and its toughness is higher than D2/1.2379/Cr12Mo1V1; The manufactured molds rarely have cracks and fissures, greatly improving their service life; The residual stress after wire cutting processing is smaller than that of Cr12Mo1V1; The cutting and grinding performance exceeds Cr12Mo1V1.
Suitable for manufacturing precision punching dies and stamping dies for cold forging, deep drawing, and wire rolling for wire cutting processing.
