Overview of Material 4140 Alloy Steel
Material 4140 alloy steel is a chromium-molybdenum medium carbon alloy steel. Steel alloy 4140 is famous for its outstanding toughness and strength. It is a popular choice in the manufacturing industries. Material 4140 steel’s versatility allows it to be widely used in lots of different industrial applications.
Chemical Composition and Characteristics
The material 4140 alloy steel comprises about 1% chromium and 0.2% molybdenum, enhancing its strength and toughness. The carbon content, around 0.4%, contributes to its hardness and resistance to wear.
The AISI / ASTM standard checmical composition is as below:
- Carbon: 0.38-0.43%
- Manganese: 0.75-1.00%
- Chromium: 0.80-1.10%
- Molybdenum: 0.15-0.25%
- Silicon: 0.15-0.30%
- Phosphorus: Max 0.035%
- Sulfur: Max 0.04%
Heat Treatment and Enhanced Properties
Heat treatments like annealing and tempering is key to enhance the properties of AISI 4140 steel alloy. These processes increase its strength and make it suitable for demanding industrial uses. Typical heat treatment for material 4140 steel as below:
| Heat Treatment | Temperatures |
| Normalize | 1600 – 1700°F (871 – 927°C), Forced air cool prior to harden/temper |
| Quench and Temper | Austenitize 1600 – 1650°F (871 – 899°C), Liquid quench, Temper to desired strength |
Machining and Welding Capabilities
Despite its hardness, steel alloy 4140 maintains good machinability. It also has decent weldability, provided appropriate preheating and post-welding procedures are followed to prevent cracking.
Varied Applications
Steel Material 4140 is extensively used in industries such as automotive, aerospace, and oil & gas. Its strength and toughness make it ideal for gears, bolts, and other high-stress parts.
You could see more details at here 15 Common Applications for Versatile 4140 Steel.
Comparison with Other Steels
When compared to alloy steel with low hardness and strength, steel alloy 4140 offers superior strength and hardenability. It outperforms many alloys in high-stress applications, though it may require more careful handling during welding.
Cost and Availability
Material 4140 alloy steel is generally more expensive than less durable steels such as 1045 steel. However, its long lifespan and strength can make it a cost-effective choice for many industrial applications.
Here at Otai, we supply both steel alloy 4140 round bar and steel plate. Both 4140 rod and plate / flat / sheet are available in stock. Especially 4140 steel plate, we keep 4140 plate for around 10000 tons. You could check the stock list of 4140 alloy steel plate here.
- 4140 round bar / rod: from Φ16mm to 300mm, available in stock. While for Φ300 above, it needs new production with lead time of 30 days around.
- 4140 steel plate / flat / sheet: from thickness 4mm to 300mm available in stock. While for thickness above 300mm up to 1000mm, it needs new production of around 30 days.
Conclusion
Material 4140 alloy steel is a robust and versatile steel material for applications which requires high strength and durability. Its unique properties make it an essential material in various industrial industries.
FAQs on Material 4140 Alloy Steel
- What sets steel alloy 4140 apart from other alloys? Its combination of strength, toughness, and hardenability makes it superior for many different applications.
- Is material 4140 alloy steel weldable? Yes, with proper preheating and post-welding treatments to prevent stress cracks.
- How does steel alloy 4140 perform in corrosive environments? It has some corrosion resistance but may require protective coatings in highly corrosive environments.
- Which industries frequently use steel alloy 4140? It’s widely used in automotive, aerospace, and oil & gas industries for high-stress components.
- How does the cost of material 4140 alloy steel compare to other steels? It is more costly than many mild steels but offers greater strength and durability, justifying its price in many applications.
For further inquiries about material 4140 alloy steel or order for 4140 steel alloy steel, feel free to contact us at jeremy@otaisteel.com or via WhatsApp at +8613610149979. Otai is your better choice for 4140 alloy steel materials with good price and prime top quality.
