90MnCrV8 Material | Cold Work Tool Steel Manufacturer

90MnCrV8 material is a high-carbon manganese-chromium-vanadium oil-hardening cold work tool steel to DIN EN ISO 4957. Its composition includes 0.85–0.95% carbon, 1.80–2.20% manganese, 0.20–0.50% chromium plus vanadium. It delivers high hardness, good wear resistance and outstanding dimensional stability; its volume change after hardening is only about 0.1%, ideal for precision tools and gauges.

This grade stands out for strong crack resistance and good machinability. It works well with oil quenching, reaching 63–65 HRC as-quenched and 58–60 HRC after tempering. It is widely used for measuring tools, machine knives, shear blades, thread cutters and forming dies. Equivalent grades: DIN 1.2842, AISI O2, JIS SKS31, GB 9Mn2V, BS B02, AFNOR 90MV8.

Supply Range & Tolerances

1. Round Bar

Hot Rolled / Forged: Diameter Φ10mm – Φ500mm
Forged: Diameter Φ50mm – Φ400mm (larger sizes available upon request)
Length: 2000mm – 5800mm (customizable)
Tolerances: Compliant with DIN EN ISO 4957 or ASTM A681
Surface conditions: Black skin, peeled, turned, or ground finish

Flat Bar / Plate

3. Forgings / Custom Shapes of 90MnCrV8 Material

Keyspark Steel offers precision plate component machining of 90MnCrV8 material, specializing in steel plate milling and precision hole finishing. Custom-made to your drawings.

We also provide our overseas customers with assembly services for various CNC machined parts.

Our team does rough and fine machining for all kinds of forging ring parts. We provided rough turning service like slewing bearing rings and gear rings to many European construction machinery partners. Keyspark Steel have strong custom ability and an engineer teams. We make products from your drawings and are very flexible.

Keyspark Steel also offers importing clients custom cold drawn steel round bars, steel square bars and hexagon steel bars in different sizes with cold drawing dies as supporting items. The material have tight tolerance, smooth surface and stable material performance. And also cold drawing dies as supporting items.

90MnCrV8 Equivalent

Standard System	Country/Region	Equivalent Grade	Common Search Terms
DIN / EN	Germany	90MnCrV8, 1.2842	90MnCrV8 material, 90MnCrV8 steel, DIN 1.2842, 90MnCrV8
AISI / ASTM	USA	O2, T31502	O2 tool steel, AISI O2
JIS	Japan	SKS31	SKS31 steel, JIS SKS31
GB	China	9Mn2V	9Mn2V steel, Chinese 90MnCrV8 equivalent
BS	UK	B02	B02 tool steel
AFNOR	France	90MV8	90MV8 steel
UNI	Italy	90MnVCr8KU	90MnVCr8KU steel

90MnCrV8 Composition

Standard	C	Si	Mn	P	S	Cr	V
DIN EN ISO 4957-2018	0.85–0.95	0.10–0.40	1.80–2.20	≤0.030	≤0.030	0.20–0.50	0.05–0.20

The high manganese and carbon content in 90MnCrV8 steel provides excellent hardenability and wear resistance. Chromium and vanadium contribute to hardness and grain refinement.

90MnCrV8 Properties

MECHANICAL PROPERTY	METRIC VALUE	IMPERIAL VALUE
Hardness (Annealed)	≤ 229 HB	≤ 229 HB
Hardness (Quenched & Tempered)	58 – 62 HRC	58 – 62 HRC
Tensile Strength (σb)	≥ 1200 MPa	≥ 174 ksi
Yield Strength (σ0.2)	≥ 900 MPa	≥ 131 ksi
Elongation (δ5)	≥ 10 %	≥ 10 %
Impact Toughness (KV, 20°C, Longitudinal)	≥ 35 J/cm²	≥ 166.6 ft·lb/in²

DIN 90MnCrV8 is typically supplied in the annealed condition with a maximum hardness of 229 HB. After oil quenching at 790–820°C and tempering at 180–220°C, it achieves a working hardness of 58–62 HRC. Tensile and yield strength values refer to the hardened and tempered condition. Unit conversion: 1 J/cm² ≈ 4.76 ft·lb/in².

Delivery Condition of 90MnCrV8 Material

Black Surface, Bright Surface, Turned Surface, Grinded Surface, Poblished surface.

90MnCrV8 Steel Application

Measuring Tools & Gauges: Precision gauges, calipers, measuring instruments, templates, jigs, and fixtures
Cutting Tools & Blades: Machine knives for wood, paper, and metal industries; cold cutting shear blades; thread cutting tools
Dies & Punches: Forming dies, blanking dies, bending dies, die plates, cutting punches, punching tools
Mold Components: Cavity plates, mold inserts exposed to abrasive stress, plastic and rubber moulds
Guide Components: Cross roller guide rails, T-slot scrapers, guiding plates, guiding rails
Industrial Components: Machine components, precision parts, slidways, scrap shear and recycling blades

Material 90MnCrV8 Heat Treatment & Processing

Heat Treatment

Soft Annealing: Heat to 680-720°C, hold for 2-5 hours, then cool slowly in furnace at 10-20°C per hour to approximately 600°C, followed by air cooling. Resulting hardness ≤229 HB. Optimized for batch machining.
Stress Relieving: Heat to approximately 650°C, hold for one hour, then air cool. Recommended after rough machining to minimize distortion during hardening.
Preheating: Recommended to avoid thermal shock before austenitizing.
Austenitizing (Heating): 790-820°C. Soak time: 15-30 minutes after temperature equalization. Protect against oxidation and decarburization.
Quenching (Cooling): Oil quench (40-60°C) is the primary method. Warm bath quenching at 180-220°C is also suitable. Hardness after quenching: 63-65 HRC.
Tempering: Double tempering is recommended to increase toughness. Temper at 150-250°C for maximum hardness (58-60 HRC), or at higher temperatures for improved toughness. For optimal dimensional stability in precision tools, two tempering cycles are recommended.

Tempering Temp	As Quenched	100°C	200°C	300°C	400°C	500°C	600°C
Hardness (HRC)	63-65	63	60	56	50	42	38

For maximum wear resistance in cutting tools and dies, temper at 150-200°C (58-60 HRC). For improved toughness in forming tools, temper at higher temperatures within the range.

Processing Guide:

Forging: Hot forming temperature: 1050-850°C. Start forging at 1050°C, finish above 850°C. After forging, cool slowly and anneal.
Machining: Annealed 90MnCrV8 material (≤229 HB) offers very good machinability. Carbide tools recommended for batch production. Hardened parts require grinding with CBN wheels.
Polishing: Suitable for polishing applications.
EDM: Suitable for wire EDM and spark erosion.
Welding: Suitable with proper procedures.
Nitriding: Can be applied for surface hardening.
Hard Chrome Plating: Suitable.
Corrosion Resistance: Corrosion resistance is better than plain carbon steels, but 90MnCrV8 material will rust unless given protective treatment.

Quality Inspection & Control of 90MnCrV8 Tool Steel

Full-process control:

Raw material and manufacturer control
Test : Chemical composition, mechanical properties, UT(ultrasonic testing), specification, surface condition, straightness, etc.
Packing: Wooden case or pallet or VCI plastic film

Why Purchase 90MnCrV8 Material from Keyspark Steel?

Fully Customizable: Dimensions, heat treatment, and hardness – all adjustable per batch order.
Certified Quality: Each batch comes with MTC certificate (EN 10204 3.1/3.2) , full chemical and mechanical test report.
ESR Option: Premium quality with Electro-Slag Remelting available for critical applications.
Stable Production: Large forging and rolling capacity ensures consistent quality across orders.
Long-Term Supply: Reserved production slots for regular customers – no interruptions.
Neutral Packaging: Oiled, wrapped, and strapped.

FAQ of 90MnCrV8 Material

Q1: What makes 90MnCrV8 Material so dimensionally stable during heat treatment?

A: One key benefit of 90MnCrV8 Material is excellent dimensional stability in heat treatment. Its volume change is only about 0.1%, with very small deformation. This comes from its manganese‑chromium‑vanadium alloy mix and low quenching temperature (790–820°C). It fits precision gauges and complex molds. Annealed hardness ≤ HB 229. Hardness after quench and temper reaches HRC 58–63.

Q2: How does 90MnCrV8 Material compare with O2 tool steel in composition and performance?

A: Material 90MnCrV8 is O2 under ISO/EN standards. It matches AISI O2 (UNS T31502) in the US ASTM system. They have nearly the same chemical composition: C 0.85–0.95%, Mn 1.80–2.20%, Cr 0.20–0.50%, V 0.05–0.20%. Its equivalent GB grade in China is 9Mn2V. They share the same performance target: good wear resistance, good hardening depth and small heat‑treatment deformation. It is oil‑hardening low‑alloy cold work tool steel.

Q3: What is the recommended heat treatment process for 90MnCrV8 Material?

A: Annealing: hold at 690–720°C, then cool inside the furnace. Annealed hardness ≤ HB 229. Quenching: heat at 790–820°C, then oil quench or salt bath quench at 180–220°C. Hardness after quenching reaches HRC 63–65. Tempering: hold at 150–250°C for at least 2 hours, cool in air. Hardness after tempering HRC 58–63. Double temper is suggested for best dimensional stability.

Q4: What hardness and wear resistance can 90MnCrV8 Material achieve after quenching and tempering?

A: Annealed hardness ≤ HB 229. Surface hardness after oil quench can reach HRC 63–65. Temper temperature vs hardness: 100°C→HRC 63, 200°C→HRC 60, 300°C→HRC 56, 400°C→HRC 50. Its wear resistance is much better than common carbon tool steel, and it has good hardening depth. Plasma nitriding can further improve mechanical and friction properties.

Q5: What are the main applications of 90MnCrV8 Material?

A: 90MnCrV8 tool steel is mainly used for stamping molds for thickness below 6 mm, paper cutting knives and plastic molds (working hardness 58–60 HRC). It is also widely used for precision gauges, blanking dies, trimming dies, rolling dies, cold shear blades, thread cutting tools, machine lead screws, cams and jaws.

Q6: What are the limitations of 90MnCrV8 Material in practical use?

A: It has three main limits. First, medium hardening depth. Core hardness may not be enough when part size is over 40 mm. Use steel with better hardening depth for large sections. Second, limited corrosion resistance. Better than plain carbon steel, but not stainless steel. Oil coating is needed in wet environments to stop rust. Third, medium toughness. Not for heavy impact loads. Choose steel with higher toughness for thick sheet heavy stamping.