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Thép hợp kim AISI 8740 | Thanh thép UNS G87400
- John
When selecting the ideal material for high-stress applications, AISI 8740 steel is a top contender. This alloy steel is specifically engineered to withstand the toughest conditions.
So, what makes AISI 8740 so reliable? In this article, we will examine the properties and products of AISI 8740 steel.
SteelPro Group, with its commitment to high-quality materials and expert support, is here to ensure you get the best AISI 8740 steel for your specific needs.
What Is 8740 Steel?
AISI 8740 steel is a high-strength, low-alloy steel. The combination of Cr and Ni improves its corrosion resistance, while Mo enhances its performance at high temperatures. This steel resists wear, fatigue, and impact. It is commonly used in critical applications such as gears, shafts, and fasteners. Its machinability allows it to be shaped into precise, complex components.
8740 Steel Chemical Composition
| Các yếu tố | Content(wt%) |
| Cacbon (C) | 0.38~0.43 |
| Silic (Si) | 0.15~0.35 |
| Mangan (Mn) | 0.75~1.00 |
| Phốt pho (P) | ≤0,035 |
| Lưu huỳnh (S) | ≤0,04 |
| Crom (Cr) | 0.4~0.6 |
| Niken (Ni) | 0.4~0.7 |
| Molipđen (Mo) | 0.2~0.3 |
8740 Steel Mechanical Properties
| Tài sản | Giá trị số liệu | Giá trị Đế quốc |
| Độ cứng, Brinell | 269 HB | 269 HB |
| Độ cứng, Knoop | 294 HK | 294 HK |
| Độ cứng, Rockwell B | 99 HRB | 99 HRB |
| Độ cứng, Rockwell C | 27HRC | 27HRC |
| Độ cứng, Vickers | 284 HV | 287 HV |
| Độ bền kéo, Tối đa | 938 MPa | 136,000 psi |
| Độ bền kéo, Độ bền kéo | 620MPa | 89.900 psi |
| Độ giãn dài khi đứt | 0.16 | 0.16 |
| Mô đun đàn hồi | 205 GPa | 29.700 kilôgam |
| Mô đun khối | 160 GPa | 23.200 kilôgam |
| Tỷ số Poisson | 0.29 | 0.29 |
| Khả năng gia công | 0.65 | 0.65 |
| Mô đun cắt | 80,0 GPa | 11.600 kilôgam |
| Izod Impact | 18,0 J | 13,3 ft-lb |
8740 Steel Physical Properties
| Tài sản | Giá trị số liệu | Giá trị Đế quốc |
| Tỉ trọng | 7,85g/cm³ | 0,284 lb/in³ |
| Điểm nóng chảy | 1425-1510°C | 2597-2750°F |
| Độ dẫn nhiệt | 40 W/m·K | 23.2 BTU·ft/hr·°F/in |
| Nhiệt dung riêng | 0,475 J/g·°C | 0,114 BTU/lb·°F |
| Độ dẫn nhiệt | 46,6 W/m·K | 323 BTU·in/giờ·ft²·°F |
8740 Steel Applications
- Bánh răng
- Trục
- Chốt
- Trục khuỷu
- Trục
- Vòng bi lăn
We collaborate with leading manufacturers to supply high-quality AISI 8740 steel for aerospace, automotive, and industrial applications. Our materials meet rigorous industry standards for performance and durability.
8740 Steel Product Forms and Size
Selecting the right steel for your project is crucial, and 8740 steel offers a range of product forms and sizes to suit your needs. SteelPro Group also offers tailored sizing solutions, guaranteeing that you receive the precise measurements needed for your project.
Thanh tròn
- Diameter: 6.35 mm ~ 254 mm (0.25 in ~ 10 in)
Thanh vuông
- Size: 6.35 mm ~ 152 mm (0.25 in ~ 6 in)
Thanh phẳng
- Width: 12.7 mm ~ 305 mm (0.5 in ~ 12 in)
- Thickness: 6.35 mm ~ 50.8 mm (0.25 in ~ 2 in)
Đĩa
- Thickness: 6.35 mm ~ 101.6 mm (0.25 in ~ 4 in)
- Width: 305 mm ~ 3048 mm (12 in ~ 120 in)
- Length: 3048 mm ~ 12192 mm (120 in ~ 480 in)
AISI 8740 Steel Specifications
| Loại | Thông số kỹ thuật |
| AMS | AMS 6322, AMS 6322F, AMS 6323, AMS 6323D, AMS 6325, AMS 6325D, AMS 6327D, AMS 6358, AMS 6358B, AMS 6327, AMS 7496 |
| Tiêu chuẩn ASTM | ASTM A322, ASTM A331, ASTM A505, ASTM A519, ASTM A29, ASTM A752, ASTM A320 (L7C, L73) |
| SAE | SAE J770, SAE J412, SAE J1397, SAE J404 |
AISI 8740 Steel Key Characteristic
Thuận lợi
- Superior Strength and Durability: AISI 8740 provides outstanding robustness and resilience for demanding applications.
- Wear and Fatigue Resistance: It is highly durable and maintains its strength under continuous pressure and repetitive use.
- Chống ăn mòn: Chromium and nickel improve its ability to resist corrosion.
- Khả năng gia công tốt: AISI 8740 can be machined with the right tools.
Nhược điểm
- Welding Issues: Welding demands proper preheating and post-weld heat treatment to prevent fractures and ensure the weld’s integrity.
- Trị giá: The alloying elements make it more expensive than simpler steel.
- Brittleness with Incorrect Heat Treatment: Improper heat treatment can cause brittleness.
- Limited High-Temperature Use: It may not perform well in extremely high-temperature environments without additional treatments.
Partner with SteelPro Group for Top-Quality 8740 Steel
SteelPro Group is proud to offer the highest quality AISI 8740, meeting rigorous industry standards. We also provide other materials like hot rolled 4140 plate. Our experienced team is prepared to provide tailored solutions and support for all your steel needs. We provide:
- Custom Cutting: Tailored to your specifications for precise sizes and shapes.
- Xử lý bề mặt: Including carburizing, nitriding, and protective coating.
- Xử lý nhiệt: Quenching, tempering, and stress-relieving to achieve the desired mechanical properties.
- Gia công: Precision machining for complex components, including turning, milling, and grinding for parts like shafts, gears, and axles.
Contact us today to discuss how AISI 8740 can power your next project with strength and durability.
