Tool and Die Steel O1 Bars

Mourad Metals is a reputable manufacturer and supplier of top-notch Titanium Hollow Bars, based in Tunis, Tunisia. With a keen emphasis on precision and quality, the company caters to both local and international markets, providing reliable steel solutions. Mourad Metals boasts modern processing facilities, rigorous quality control, and a wealth of technical expertise to ensure their O1 steel bars have consistent chemistry and outstanding performance. They are dedicated to customer satisfaction, timely deliveries, and competitive pricing, making them a go-to choice for toolmakers, engineers, and manufacturers in need of dependable materials for their critical tooling and machining requirements across various industries worldwide.

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O1 Tool Steel Round Bar

Die Steel O1 Rods

O1 Tool and Die Steel Bar

What is Tool and Die Steel O1 Bars?

Tool and Die Steel O1 Bars are promanganese, 1.00% chromium, with trace amounts of silicon, phosphorusduced primarily from carbon steel, and its composition includes approximately 0.90–1.00% carbon, 0.40% , and sulfur. It is due to this composition that O1 steel boasts excellent hardness, wear resistance, and retention of edges. Its tensile strength is between 700-1,100 MPa, and after the heat treatment, the hardness varies between 55–62 HRC. O1 is also known for good machinability and dimensional stability, making it ideal for use in tool and die applications. Its toughness and resistance to cracking under high applied pressure ensure reliability in demanding machining environments.

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Tool and Die Steel O1 Bars Specifications

Standard : ASTM A681, ASME SA681
Dimensions : EN, DIN, JIS, ASTM, BS, ASME, AISI
Form : Round
Diameter : 10 mm ~ 900 mm
Size : 0.08 mm to 25.00 mm
Diameter Range : 0.040 mm – 12 mm (0.0016” – 0.4724”)
Application : Lathe Tools, Milling Cutter, Cutter Blades, Boring Tools, Twist drills, Milling Knives, Reamers, Taps, Metalcutting saws, Screw Cutting Tools, File Cutter’s Chissels, Drills, Hobs, Drill Bits, Tread cutting tools etc

Chemical Compositions of Tool and Die Steel O1 Bars

CHEMICAL PROPERTIES	O1 STEEL (%)
Carbon	0.85-1.00
Manganese	1.00-1.40
Silicon	0.50
Chromium	0.40-0.60
Nickel	0.30
Tungsten	0.40-0.60
Vanadium	0.30
Copper	0.25
Phosphorus	0.03
Sulfur	0.03

Mechanical Properties of Tool and Die Steel O1 Bars

MECHANICAL PROPERTIES	O1 STEEL (Imperial)
Tensile Strength	245000 psi
Yield Strength	218000 psi
Elongation at Break	0.00%
Modulus of Elasticity	31000 ksi
Hardness (Rockwell)	50
Hardness (Vickers)	517
Hardness (Knoop)	513

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Equivalent Grades of Tool and Die Steel O1 Bars

Country	USA	German	Japan
Standard	ASTM A681	DIN EN ISO 4957	JIS G4404
Grades	O1	1.2510/100MnCrW4	SKS3

Thermal Properties of Tool and Die Steel O1 Bars

Properties		Conditions
Properties		T (°C)	Treatment
Thermal expansion	10.6 x 10^-6/ºC	20-260	–

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Tool and Die Steel O1 Bars Types

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Frequently Asked Questions (FAQ)

What Factors Should Be Considered When Choosing Tool and Die Steel O1 Bars?

When choosing O1 tool and die steel bars, consider factors like hardness, wear resistance, machinability, heat treatment requirements, intended application (e.g., cutting, stamping), and cost-effectiveness for long-term use.

How Do Tool and Die Steel O1 Bars Resist Corrosion?

O1 tool and die steel bars have moderate resistance to corrosion due to their carbon content and alloy composition. However, they are not stainless and can rust without proper maintenance, such as coating or regular oiling.

Can Tool And Die Steel O1 Bars Be Welded?

O1 tool and die steel can be welded, but it's crucial to preheat and control cooling rates to prevent cracking. Post-welding heat treatment is recommended to restore its hardness and properties.

Tool and Die Steel O1 Bars Uses

Tool and Die Steel O1 is an oil-hardening, cold-work tool steel that includes carbon, manganese, chromium, tungsten, and trace amounts of silicon. This well-balanced composition results in excellent hardenability, a fine grain structure, and stability during heat treatment. O1 steel typically achieves a hardness of 57–62 HRC after quenching, making it a reliable choice for demanding applications.

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