4CrMnSiMoV Hot Work Tool Steel

4CrMnSiMoV Hot Work Tool Steel is a versatile low-alloy tool steel primarily used for hot work forging dies, especially for large sections. At Aobo Steel, with our extensive experience in tool steel forging, we recognize the value this grade brings to demanding applications.

1.  4CrMnSiMoV Tool Steel Chemical Composition

Understanding the precise chemical makeup is crucial for performance. While specific standards may have slight variations, the typical composition range for 4CrMnSiMoV Hot Work Tool Steel is:

• Carbon (C): 0.35% – 0.45%
• Siliciu (Si): 0.80% – 1.20% 
• Mangan (Mn): 0.80% – 1.10%
• Crom (Cr): 1.30% – 1.50%
• Molibden (Mo): 0.40% – 0.60%
• Vanadiu (V): 0.20% – 0.40%
• Fosfor (P): ≤0,030%
• sulf (S): ≤0,030%

2. 4CrMnSiMoV Tool Steel Properties

4CrMnSiMoV offers a solid balance of properties essential for hot-working tools:

• High Hot Strength: Maintains strength effectively at elevated operational temperatures.
• Good Wear Resistance: Alloy elements provide resistance against abrasion during forming.
• Good Impact Toughness: Withstands the impact loads common in forging. Its toughness is generally considered superior to that of 5CrMnSiMoV.
• Good Temper Resistance: Resists softening during prolonged exposure to heat within its working range.
• Good Thermal Fatigue Resistance: Handles repeated heating and cooling cycles well.
• Întărire bună: Achieves effective hardness through quenching, even in larger sections.
• Workability: Suitable for both hot forging and subsequent cold machining processes.

3. 4CrMnSiMoV Tool Steel Heat Treatment Guidelines

Correct tratament termic is critical to unlocking the full potential of 4CrMnSiMoV Hot Work Tool Steel. Our experience guides the following typical procedures:

3.1 Forjare

• Initial Temperature: 1050°C – 1150°C
• Finishing Temperature: Above 850°C
• Răcire: Slow cooling after forging is essential to prevent cracking. For large forgings, controlled cooling in a furnace at around 600°C is recommended. Preheating at 800-900°C is often necessary.

3.2 Annealing (Isothermal)

• Scop: Softening for improved machinability.
• Proces: Heat to 840-860°C (hold 2-4 hrs), furnace cool to 700-720°C (hold 3-5 hrs), furnace cool to <550°C, then air cool.
• Duritate rezultată: Typically ≤241 HBW.

3.3 stingere

1. Temperatură: Depends on the die size.
   
   • Large dies: 870-900°C
   • Medium/Small dies: 900-930°C
2. Mediu: Typically, oil quenching.

3.4 Revenirea

1. Scop: Relieve stress, achieve target hardness and toughness.
2. Temperature & Hardness: Varies by application and size:
   
   • Small Forging Dies: Temper at 470-610°C for 44-49 HRC.
   • Medium Forging Dies: Temper at 610-630°C for 41-44 HRC.
   • Large Forging Dies: Temper at 630-660°C for 38-42 HRC.
   • Nota: Specific tempering cycles (e.g., 490-540°C for working parts, 620-660°C for dovetails) are employed to relieve stress and stabilize the structure, depending on the section of the die.

4. Aplicații

This steel is a reliable choice for various hot work tooling components:

• Large and medium hammer forging dies
• Pressure die forging molds
• Calibration dies
• Flat forging dies
• Bending dies
• Connecting rod dies
• Front axle beam dies
• Gear dies
• Hot extrusion dies
• Some plastic molds require good hot strength

5. Comparison with Other Grades

• vs. 5CrMnSiMoV: Considered an improvement due to lower carbon content, leading to enhanced toughness while maintaining good strength.
• vs. 5CrNiMo: Offers better high-temperature strength, hardenability, temper resistance, and thermal fatigue resistance. Impact toughness is comparable, though potentially slightly lower. It is sometimes used as a substitute for 5CrNiMo.

6. Supply and Standards

Market names can sometimes vary. At Aobo Steel, we supply 4CrMnSiMoV according to recognized standards, such as GB/T, and provide full material certification to ensure you receive exactly what you specify. Rely on trusted suppliers like us to guarantee material quality and consistency.

Concluzie

4CrMnSiMoV is a proven hot work tool steel offering a dependable combination of strength, toughness, and resistance to heat and wear. Proper selection and heat treatment, tailored to the specific application, are crucial for maximizing performance.

With over 20 years of forging experience, Aobo Steel possesses in-depth knowledge of materials such as 4CrMnSiMoV. Contact us to discuss your requirements.