4Cr3Mo3SiV Hot Work Tool Steel | Properties, Applications & Supply Insights

4Cr3Mo3SiV tool steel is a GB-standard hot work tool steel renowned for demanding applications such as forging dies, die casting, and hot extrusion. Engineers value this grade for its excellent thermal fatigue resistance and ability to maintain stable hardness at high temperatures.

While H13 is a global benchmark, 4Cr3Mo3SiV tool steel offers a distinct combination of properties. Its higher molybdenum content enhances resistance to softening and thermal fatigue, making it a cost-effective alternative for projects where sourcing from reliable Chinese steel manufacturers ensures supply chain stability and cost efficiency.

In this article, we explore the key data that matters for your project: chemical composition, mechanical properties, and optimal heat treatment processes for 4Cr3Mo3SiV steel plates. We also provide guidance for global buyers on connecting with trusted 4Cr3Mo3SiV steel suppliers.

Performance and Applications of 4Cr3Mo3SiV Hot Work Tool Steel Plates

The exceptional performance of 4Cr3Mo3SiV tool steel is derived from its well-designed chemical composition. Key alloying elements include chromium, molybdenum, and vanadium. These alloying elements promote the formation of fine carbides during heat treatment.

• Chromium increases hardenability and enhances oxidation resistance.
• Molybdenum improves high-temperature strength and reduces softening during tempering.
• Vanadium refines the grain size and forms stable carbides, contributing to secondary hardening.

Thanks to these mechanisms, 4Cr3Mo3SiV tool steel demonstrates superior resistance to thermal fatigue and maintains hardness even under repeated heating and cooling cycles. Many 4Cr3Mo3SiV steel suppliers provide plates and bars for forging dies and die casting molds, ensuring stable quality and availability for global buyers.

4Cr3Mo3SiV Chemical Composition

Element	Content (%)
C	0.32–0.42
Cr	2.80–3.30
Mo	2.80–3.30
Si	0.80–1.20
V	0.40–0.60
Mn	≤0.50
P, S	≤0.030

This balanced composition provides a mix of high-temperature strength, wear resistance, and thermal stability, making it ideal for tool steel for hot forging dies.

Mechanical Properties of 4Cr3Mo3SiV Steel Plate

Property	Value (Typical)
Hardness (after tempering)	44–48 HRC
Working temperature range	Up to 600–650°C
Impact toughness (Charpy)	≥25 J
Modulus of elasticity	Approx. 210 GPa

The tool steel hardness at elevated temperature is especially notable, maintaining stability even in high-pressure, high-heat cycles.

Key Properties

• High thermal fatigue resistance
• Excellent tempering stability
• Good toughness and wear resistance
• Suitable for large and complex hot working dies

It belongs to the category of hot work tool steel grades, which are specifically designed to perform under cyclic heating and cooling conditions.

Applications of 4Cr3Mo3SiV Hot Work Tool Steel Plates

4Cr3Mo3SiV steel plates are widely used for manufacturing:

• Hot forging dies for steel and non-ferrous metals
• Aluminum and magnesium alloy die casting molds
• Hot extrusion dies
• Die holders and support blocks
• High-pressure plastic molds with thermal cycling

Its excellent resistance to cracking and thermal fatigue makes it suitable for large dies that undergo repeated thermal cycling.

Buyers can source 4Cr3Mo3SiV steel plates and mold steel bars directly from GB 4Cr3Mo3SiV suppliers for forging, extrusion, and die casting applications.

Heat Treatment and Processing

Recommended heat treatment procedures for 4Cr3Mo3SiV steel plates:

• Annealing: Heat to 850–880°C, followed by controlled cooling in the furnace. 
• Quenching: Oil or air quench from 1020–1050°C. 
• Tempering: 550–650°C, multiple tempering cycles recommended for stability. 

International Standards Overview

To support global buyers, here is a comparison of 4Cr3Mo3SiV with other common international hot work tool steel:

Standard	Grade Name	Country / System	Remarks
GB/T 1299	4Cr3Mo3SiV	China	Domestic GB standard hot work tool steel.
AISI	H13	USA	Most similar in application and performance to 4Cr3Mo3SiV; the primary international reference grade for hot forging and die casting.
DIN EN ISO	1.2344 / X40CrMoV5-1	Germany / EU	Comparable to H13; a common European grade for hot work tools. Not a direct equivalent to 4Cr3Mo3SiV.
JIS	SKD61	Japan	Comparable to H13; the primary Japanese standard grade for such applications. Use as reference only.
BIS IS	HDS H13	India	Based on H13; suitable as a reference grade for hot work tooling in the Indian market.
JIS	SKD7	Japan	A higher alloyed hot work steel; sometimes considered for applications demanding superior performance. Not directly equivalent.

4Cr3Mo3SiV vs. H13: How Do They Compare?

Feature	4Cr3Mo3SiV	H13 (4Cr5MoSiV1)
Cr Content	3.0%	5.0%
Mo Content	3.0%	1.2%
Tempering Stability	High	Very High
Thermal Fatigue Resistance	High	Excellent
Cost*	Lower	Higher
Availability	China-specific	Global standard

*Cost advantage is primarily derived from localized production and supply chain efficiency.

Although H13 has broader recognition, 4Cr3Mo3SiV hot work mold steel offers a competitive alternative from Chinese steel suppliers and manufacturers, especially for cost-sensitive projects.

FAQs on 4Cr3Mo3SiV Hot Work Tool Steel

• Q1: Is 4Cr3Mo3SiV suitable for aluminum die casting?
  Yes. Its high-temperature strength and thermal fatigue resistance make it ideal for Al/Mg alloy cast dies.
• Q2: Can 4Cr3Mo3SiV replace H13 in tooling applications?
  In many cases, yes. It’s a cost-effective alternative with slightly lower alloy content but good performance.
• Q3: Is this steel available in pre-machined condition?
  Most suppliers offer annealed or rough-machined hot work tool steel plates; some also provide PVD coating or pre-hardening.
• Q4: What is the difference between H13 and M2 steel?
  H13 is a hot work tool steel used for die casting and forging, while M2 is a high-speed steel used in cutting tools. H13 has superior toughness and thermal fatigue resistance, while M2 offers extreme hardness and wear resistance at high speeds.
• Q5: What is the difference between H13 and S7 steel?
  H13 offers better thermal fatigue resistance and is optimized for hot work, while S7 is an air-hardening shock-resistant tool steel preferred in cold work applications. S7 has better impact resistance, but H13 performs better in sustained high-temperature environments.
• Q6: Can 4Cr3Mo3SiV also be used as cold work die steel?
  Yes. While mainly categorized as hot work tool steel, certain grades of 4Cr3Mo3SiV steel plates and bars are adapted in cold work die steel applications where toughness and stability are required.

👉 Global customers looking for GB 4Cr3Mo3SiV suppliers can find mold steel bars and hot work plates in stock, with customization for different die casting and forging projects. If you’re also considering steels for cold working applications, check out our detailed guide on cold work tool steel grades and their uses.

Conclusion

Partnering with experienced 4Cr3Mo3SiV steel supplier in China allows buyers to secure competitive pricing and consistent supply, especially compared to imported H13.

As one of the reliable GB 4Cr3Mo3SiV suppliers, we provide high-quality steel plates and bars with guaranteed homogeneity and strict adherence to GB/T standards. Contact Us to learn more about specifications, delivery, and technical support.

Email: info@cjmstainlesssteel.com

WhatsApp: +86 181 9190 6640

Why Choose Our 4Cr3Mo3SiV Steel

As a dedicated 4Cr3Mo3SiV hot work mold steel and cold work die steel exporter, we offer tailored sizes, technical support, and fast delivery from our warehouses.

• High Purity: ESR (Electro-Slag Remelting) process for fewer inclusions and longer die life.
• Uniform Properties: Stable hardness and toughness across thick sections.
• Customized Supply: Plates and bars cut to size, fast delivery from stock.
• Technical Support: Heat treatment and machining guidance for toolmakers.
• Certification: Full mill test certificates (EN10204 3.1/3.2) for global projects.