Tool and Die Steel O1 Bars

Chuck Metals is located in Singapore, Singapore. With a reputation for quality, we manufacture and supply a range of metal products for various industrial applications-from extremely versatile wire and bars to a wide range of other uses. We offer precision-engineered O1 Tool and Die Steel Bars, which are known for their superlative hardness, wear resistance, and good machinability. Our O1 steel bars are produced in conformity with rigorous standards in all sectors, making them perfect for tooling, die-making, and machining. At Chuck Metals, we deliver products that you can trust and which are durable enough to satisfy customer quality and service requirements and for which delivery will not be tortured.

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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 produced primarily from carbon steel, and its composition includes approximately 0.90–1.00% carbon, 0.40% manganese, 1.00% chromium, with trace amounts of silicon, phosphorus, 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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Tool and Die Steel O1 Bars Uses

Tool and Die Steel O1 Bars have widely been used for the production of precision tools and components because they possess excellent hardness, wear resistance, and machinability. The common application of O1 steel is for the production of cutting tools, dies, punches, molds, and jigs. O1 steel is ideal for machining operations requiring high precision like stamping, shearing, and forming tools. It is used for tools, which have the tendency to sustain heavy wear such as knives, blades, and forming dies. Another reason O1 is in such demand is its ability to sustain sharp edges in the manufacturing of small, complex components for the automotive, aerospace, and metalworking industries.

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