| Technique: | Hot Rolled |
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| Standard: | AISI, JIS, ASTM, DIN, BS, GB |
| Certification: | IS0, RoHS, ABS |
| Payment Term: | 30% Tt Deposit, Balance Against Bl Copy |
| Length: | 3000-5800mm |
| Delivery Date: | 30 Days |
| Samples: |
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| Customization: |
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ASTM A8 A8 MOD Cold Work Tool Steel
Quick Details
1: AISI A8 steel introduction
AISI A8 is high strength, high chromium steel engineering plastic, forging special steel, is also a kind of oil-cooled, air-cooled hardened die steel. It is suitable for high cut-off cutting and forming processing, with high wear resistance and high toughness of multi-use high alloy die steel. AISI A8 has high haedness, excellent corrosion resistance, high temperature characteristics, and common hardness range is 52-58 HRC.
2: AISI A8 Steel equivalent
| Country | China | Japan | Germany | USA | UK |
| Standard | GB/T 1299 | JIS G4404 | DIN EN ISO4957 | ASTM A681 | BS 4659 |
| Grade | / | / | / | A8 | / |
| Grade | C | Mn | P | S | Si | Cr | V | Mo | |||||
| A8 | 0.50 | 0.60 | 0.20 | 0.50 | 0.03 | 0.03 | 0.75 | 1.10 | 4.75 | 5.50 | 1.00 | 1.50 | 1.50 |
4: AISI A8 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 A8 steel overviews
| Size | Round | Dia 6-1200mm |
| Plate/Flat/Block | Thickness 6mm-500mm |
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| Width 20mm-1000mm |
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| 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.. | |
| Packing | Standard Packages, or as Customers Request | |
| Delivery time | 30-45 days | |
| Application | AISI A8 is used for precision die, edge cutting die, deep drawing die, cold forging die, pendulum rolling die, rolling die, cold extrusion die with complex shape and pipe drawing die. | |
6. AISI A8 Tool Steel Heat Treatment
Tempering of A8 steels is performed at 148-315°C (300-600°F), Double tempering is recommended for tempering temperatures of 900°F and higher. Soak well at the selected temperature and soak for at least one hour per 25mm of total thickness.
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.
Heat treatment
Isothermal annealing:
- Heat to 800°Cand hold at temperature for 1/2 h to 1 h;
- Furnace cooling to 670°Cand hold at temperature for at least 10 hours;
- Cool by 10°C/h to 630°C;
- Cooling in air.
Maximum hardness:≤240 HB
Stress relieving:
To be carried out after maching before the final heat treatment.
- Heat to 600-650°C, hold for 4-6 hours;
- Cooling in furnace to 300-350°C;
- Cooling in air
Hardening:
- Initial preheating to 350-450°C;
- Second preheating to 650-750°C;
- Heat to hardening temperature 860-890°Cand hold at temperature;
- Cooling in hot oil (40-60°C); oil quenched hardness: 54-59HRC;
Tempering:
Tempering must be carried out within one hour from hardening(warm part) in the range 550-630°Cfor 4-6 hours according to hardness required, the dimensions of the parts and operating conditions.
Hunan Qilu Industrial Co., Ltd has the capacity to forge round steel, steel flat, square steel, module, shaft and roller, etc. The main specifications of the products include Φ80-1000mm forging materials and 80-1200mm square billets and which the maximum piece weight can reach 50T.
The company owns advanced special steel smelting facilities and forging processing equipments, the main steel-making equipment include 2 sets of 50t ultra-high power electric arc furnaces,2 sets of 60t LF refining furnaces,1 set of 60t vacuum degassing refining furnace and 4 sets of 1-20t electroslag re-melting furnaces.
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