AISI O2 Steel Round Bar Sheet Plate, DIN 1.2842, JIS SKS31
AISI O2 steel also can be called JIS SKS31 and DIN 1.2842 steel. It is the better type compare with the O1 tool steel. Its content of carbon, chromium and tungsten has been raised. So it has a higher hardenability characteristic, the deformation is small during the quenching. It is a low alloy tool steel which is better than carbon steel at the point of the mechanical property. It has high hardness and wearing resistance. Because of the certain account of vanadium element, the crystal grain is smaller then decrease the overheating sensitivity of the steel. At the meantime, the carbide is getting smaller and the distribution is uniformity. O2 steel round bar chemical composition and heat treatment as below.
| AISI O2 Steel Round Bar Sheet Plate Supply Range | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Specification | Surface | |||||||||||||||||
| Round Bar | Dia: 8mm – 350mm; Other specifications can be customized. | Black Surface/Bright Surface /Grinded/Peeled/Turned As per given requirements. | |||||||||||||||||
| Sheet/Plate/Slab | Thickness: 2mm –300mm; Width 200mm – 800mm; Other specifications can be customized. | Black Surface/Bright Surface /Grinded/Peeled/Turned As per given requirements. | |||||||||||||||||
O2 Steel Grade Equivalent Chart
| Country | China | USA | Germany/UK/France | ISO |
|---|---|---|---|---|
| Standard | GB/T 1299-2000 | ASTM A681-08 | EN ISO 4957-1999 | ISO 4957: 1999 |
| Grades | 9Mn2V (T20000) | O2 | 90MnCrV8/1.2842 | 90MnCrV8 |
O2 Steel Sheet Plate Chemical Composition
| STAND | Grade | C(%) | Mn(%) | P(%) | S(%) | Si(%) | Cr(%) | V(%) | Mo(%) | Co(%) |
|---|---|---|---|---|---|---|---|---|---|---|
| GB/T 1299-2000 | 9Mn2V (T20000) | 0.85-0.95 | 1.70-2.00 | ≤0.030 | ≤0.030 | ≤0.40 | - | 0.10-0.25 | - | ≤1.00 |
| ASTM A681-08 | O2 | 0.85-0.95 | 1.40-1.80 | ≤0.030 | ≤0.030 | ≤0.50 | ≤0.50 | ≤0.30 | ≤0.30 | - |
| EN ISO 4957-1999 | 90MnCrV8/1.2842 | 0.85-0.95 | 1.80-2.20 | ≤0.030 | ≤0.030 | 0.10-0.40 | 0.20-0.50 | 0.05-0.20 | - | - |
| ISO 4957: 1999 | 90MnCrV8 | 0.85-0.95 | 1.80-2.20 | - | - | 0.10-0.40 | 0.20-0.50 | 0.05-0.20 | - | - |
1.2842 Steel Physical Properties
| Properties | T (°C) | |
|---|---|---|
| Density | 7.66 x 1000 kg/m³ | 25 |
1.2842 Steel Mechanical Properties
| Properties | T (°C) | |
|---|---|---|
| Poisson's ratio | 0.27-0.30 | 25 |
| Elastic modulus | 27557-30458 ksi | 25 |
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O2 Steel Application
It is the standard of the USA, it is oil quenching hardening tool steel. It is widely used due to good processability and wearing resistance. But its toughness and decay resistance are not good. And its application as below.
1.It is used to make the fittings of blanking die with high hardness. And the width is smaller than 3mm.
2.The precision template with good wearing resistance and small deformation.
3.Knives, screw tap, screw die, reamer bit and etc.
4.Be used to make the mold base with high strength, wearing resistance.
1.2842 Steel Characteristics
1.The processibility is good and the size after heat treatment is stable.
2.High wearing resistance.
3.The deformation is small and even without it during the processing.
4.The toughness is not good.
O2 Steel Round Bar Sheet Plate Heat Treatment
Spheroidizing Annealing
1.2842 steel usually be processing with spheroidizing annealing at the same temperature. After forging, heat the mold base up to 760℃-780℃. And then keep the temperature for 2h-4h, furnace cooling to 680℃-700℃, stay the temperature for 5h-6h. Finally, make it air cooling after the temperature is about 500℃ for furnace cooling.
Quenching and Tempering
The temperature of quenching is 800℃-840℃. And the small mold base usually uses the method of oil quenching. The tempering stability is not good. It usually needs a low temperature that is about 160℃-170℃ to tempering. And the time is about 2 hours.
O2 Steel Supply
We have our own cutting and processing equipment. Specifications can be cut and customized according to your requirements.
We are a professional special steel stockist and supplier with a high-quality stand for many years. As a professional O2 steel supplier, please contacts us for any request. Songshun Steel always with you.
Our Advantage
Manufacturing
With 7000 tons of hydraulic forging press, electric slag furnace and other high-end production equipment, we produce a great variety of steels with the best quality in China.
Testing
In order to control the quality, we have complete testing methods to make sure satisfy the customer needs, including Chemical Analysis, Ultrasonic Test and so on.
Massive Stock
We keep a mass stock are over 20000 tons for various steel type, including steel round bar, steel sheet, alloy steel, carbon steel, stainless steel, mold steel, steel coil and etc.
Customized Service
With a professional steel engineers team, we provide customized service according to your project drawing, also provide professional project experience for your special project, such as materials, processing conditions and etc.
World Wide Delivery
For container shipment, standard packing and bundle round bar and flat bar would be applied. It is necessary to fasten & reinforcement would be done to ensure the safety and better unloading at the destination port.
For less than container shipment, wooden box package would be applied for different size materials. For milled or grounded materials, the anti-rust oil would be needed to ensure the surface condition, within the wooden box.
