Aobo Steel supply O2 tool steel for your project

Premium O2 Tool Steel Supplier for Unmatched Durability

Need an O2 tool steel supplier that stands out? Aobo Steel provides top-grade O2 tool steel tailored for applications requiring exceptional edge retention and durability.

O2 tool steel has high hardness and wear resistance. It experiences minimal distortion during quenching and has excellent hardenability. This steel is suitable for making various precision measuring tools and templates. It is also used for smaller-dimension dies, cold press molds, engraving molds, and blanking dies. Additionally, it can be used for machine tool screws and other structural components.

The designation is O2 in the U.S. ASTM A681 system. Similar designations under other national standards include ISO 90MnV2, USA/UNS T31502, Germany/DIN 90MnCrV8, and Germany/W-Nr. 1.2842.

O2 tool steel

1.2842 tool steel

O2 steel Applications

Cutting Tools
O2 is widely used to manufacture cutting tools such as chisels, drills, and metal cutting saw blades because it maintains a sharp edge.
Punches and Dies
O2’s toughness and wear resistance make it ideal for producing punches and dies that can withstand high-impact forces and wear.
Knives and Blades
O2 tool steel is a popular choice for knife makers and those requiring precision cutting due to its sharpness and durability.
Cold Forming Tools
O2 is used for cold-forming tools subjected to high mechanical stress and requiring exceptional wear resistance.

Quality O2 Steel for Precision Applications

Choose Aobo Steel as your O2 steel supplier when precision is key. Our O2 steel is noted for its ability to hold a sharp edge, making it ideal for intricate work like stamping dies and thread rolling dies. Aobo Steel’s O2 steel offers excellent machinability before hardening, simplifying the manufacturing process and allowing for more detailed and complex designs.

O2 tool steel overview

O2 steel is a cold work mold steel. It is easy to forge and anneal, has good machinability, but relatively low toughness and hardenability. Compared to carbon tool steel, it has higher hardness and wear resistance, good blanking ability, and low distortion during quenching. It requires a hardness of 63 HRC.

Chemical composition

Element	Carbon (C)	Manganese (Mn)	Silicon (Si)	Chromium (Cr)	Tungsten (W)	Vanadium (V)	Phosphorus (P)	Sulphur (S)
Content (%)	0.85 – 1.00	1.00 – 1.40	0.50 (max)	0.40 – 0.60	0.40 – 0.60	0.30 (max)	0.030 (max)	0.030 (max)

O2 steel equivalent

Country/Region	Standard	Grade
USA	AISI/ASTM	O2 (ASTM A681)
Germany	DIN	1.2842 / 90MnCrV8
Japan	JIS	SKS31
China	GB/T	9Mn2V

Mechanical Properties:

Hardness: 62 HRc (Rockwell C)
Elastic Modulus: 27557-30458 ksi (at 25°C)
Poisson’s Ratio: 0.27-0.30 (at 25°C)

Thermal Properties:

Thermal Expansion: 11.2 x 10^-6/°C (from 20-100°C)
Forging Temperature: 980-1050 °C
Density: 7.85 kg/m³
Melting Point: (Not specified in the search results, but typical for steel is around 1420-1540°C)

Heat treatment

Annealing process

Heating temperature: 750 ~ 770°C
Holding for: 3 ~ 5 hours
Equalizing temperature: 680 ~ 700°C
Holding for: 4 ~ 6 hours
Annealing hardness: less than or equal to 229HBW

Quenching process

Normal quenching heating temperature: 780 ~ 820°C
Oil quenching or nitrate-graded quenching
Hardness reaches: above 62HRC
The microstructure of 9Mn2V steel quenched at 780°C is martensite + retained austenite + residual carbides
Quenching hardness: about 65HRC
Bending strength (σ_bb): about 2058MPa, which is the highest quenching hardness and bending strength
When O2 steel is quenched at 820°C, the quenching hardness drops to 64.5HRC, and the bending strength (σ_bb) drops to 2009MPa

Tempering Process

The tempering resistance of 9Mn2V steel is relatively poor, and the hardness can drop below 60 HRC after tempering at 200°C. The tempering temperature generally requires air cooling between 160-180°C, with a hardness of 60-62 HRC. Tempering brittleness and significant volume swelling should be prevented when the tempering temperature is 200-300°C.

Forging process

Item	Heating Temperature (°C)	Initial Forging Temperature (°C)	Final Forging Temperature (°C)	Cooling
Steel Ingot	1140 ~ 1180	1100 ~ 1150	≥850	Slow Cooling
Steel Billet	1080 ~ 1120	1050 ~ 1100	≥850	Slow Cooling

Durable O2 Tool Steel for Demanding Tasks

Opt for Aobo Steel when you need an O2 tool steel supplier known for durability. The specificities of O2 steel, including good hardenability and wear resistance, make it suitable for tools subjected to high stress. Aobo Steel ensures that your O2 steel is crafted to withstand the toughest conditions, maintaining its integrity and performance throughout its use.

O2 Tool Steel Equivalent: DIN 1.2842

DIN 1.2842 is a steel grade under the German standard system, which has a similar composition and properties to O2 steel.

1.2842 Chemical composition

Carbon (C)	Chromium (Cr)	Manganese (Mn)	Silicon (Si)	Phosphorus (P)	Sulfur (S)
0.90 – 1.00	7.00 – 8.00	0.30 – 0.50	0.10 – 0.30	≤ 0.03	≤ 0.03

1.2842 steel Physical Properties

Property	Value
Density	7.85 g/cm³
Melting Point	~1420–1460°C
Thermal Conductivity	~42 W/(m·K) at 20°C
Specific Heat Capacity	~460 J/(kg·K) at 20°C
Electrical Resistivity	~0.30 µΩ·m at 20°C
Modulus of Elasticity	~210 GPa
Poisson’s Ratio	~0.29

Aobo Steel supply O2 tool steel for your project​