O2 Cold Work Die Steel Description

O2 steel is a kind of low alloy tool steel with better comprehensive mechanical properties than carbon tool steel, and it has higher hardness and wear resistance.

When quenching, the deformation is small and the hardenability is good.

Because the steel contains a certain amount of vanadium, the grain size is refined and the overheating sensitivity of the steel is reduced.

At the same time, the carbides are fine and evenly distributed.

  • 10-6·K-1 = 10-6/K
  • 1 Ω·mm²/m = 1 μΩ·m
  • 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3
  • 1 GPa = 1 kN/mm2
  • 1 MPa = 1 N/mm2

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AISI O2 steel introduction

O2 TOOL STEELAISI O2 tool steel is an oil hardening tool steel which is supplied in the annealed condition and characterised by its characteristics of offering good durability.

Tool steel O2 is with excellent wear resistance and its ability to hold a good cutting edge. O2 steel is a good quality general purpose tool steel often used where the expense of a high carbon high chromium tool steel would not be justified.

AISI O2 Steel equivalent

StandardGB/T 1299JIS G4404DIN EN ISO4957ASTM A681BS 4659
Grade9Mn2V1.2842 / 90MnCrV8O2B02

AISI O2 steel chemical composition

O2 / T315020.850.951.401.800.030.03. . .0.50. . .0.50. . .0.300.30
1.2842 / 90MnCrV80.850.951.802. . .
B020.850.951.501.800.0350.035. . .0.40. . .. . .. . .0.25. . .
9Mn2V0.850.951.702.000.030.03. . .0.40. . .. . .0.100.25. . .

AISI O2 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.

AISI O2 steel overviews

SizeRoundDia 6-1200mm
ProcessEAF+LF+VD+Forged+Heat treatment(optional)
Heat treatmentNormalized ; Annealed ; Quenched ; Tempered
Surface conditionBlack; Peeled; Polished; Machined; Grinded; Turned; Milled
Delivery conditionForged; Hot rolled; Cold drawn
TestTensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc.
Payment termsT/T;
Trade termsFOB; CIF; C&F; etc..
PackingStandard Packages, or as Customers Request
Delivery time30-45 days
Application AISI O2 tool steel is used as tool steel for universal use, highly stressed plastic moulds, mould inserts for high hardness and abrasive stress, blanking and stamping tools for all types cutting sheet metals up to 6 mm thickness, cold forming dies, cutting and punching tools of all types, shear blades for paper, plastic and metalworking industries, reamers, thread chasers and cutting tools, pressure pads, guide pins, taps, measuring tools, precision calipers and plug gauges, woodworking tools, plastic and rubber compression moulds, deep drawing tools, clipping.

AISI O2 Tool Steel Heat Treatment

  • Annealing : 680 – 720°C
  • Hardness after annealing : Max. 220 HB
  • Stress relieving : Approx. 650°C
  • Hot forming : 1050 – 850°C
  • Hardening : 790 – 820°C
  • Quenching media : Oil, Salt bath (220 – 250°C) up to 20 mm thickness
  • Hardness after quenching : 63 – 65 HRCHardness after tempering :

7: Delivery condition

(1) For hot forged or hot rolled bar, usually the delivery condition is hot forged or rolled, annealed, rough turned.

(2) For hot forged plate, usually the delivery condition is hot forged, annealed, milled surface.

(3) For hot rolled plate, usually the delivery condition is hot rolled, annealed, black surface.