Characteristics of 3S144 / S144 Stainless Steel Bar

1. Thép không gỉ martensit tự cứng khi tiếp xúc với môi trường

3S144 / S144 is a Cu + Nb precipitation-hardening martensitic stainless steel bar grade, developed within the BS S100 aerospace series to deliver very high strength through controlled solution treatment and ageing. It has the same basic chemistry as S143, but is heat treated to a higher strength level.

2. Very High Strength After Aging Treatment

After solution treatment and low-temperature ageing, the alloy provides:

• Very high tensile strength: typically about 1130–1330 MPa

• Độ bền kéo cao: typically ≥ 1030 MPa (0.2% proof)

• High hardness: approximately 352–401 HB

This strength level, combined with good toughness, makes 3S144 suitable for highly stressed structural and rotating components in aerospace and advanced mechanical systems.

3. Khả năng chống ăn mòn tốt

The corrosion resistance of 3S144 is:

• Better than standard martensitic grades such as 420 / 440 in most industrial and mildly marine environments

• Comparable to or slightly below austenitic grades like 304 in many atmospheric conditions

• Adequate for long-term use in aerospace, marine, and general engineering applications where high strength plus corrosion resistance are required

However, its corrosion resistance is somewhat lower than that of higher Cr PH grades (e.g., 17-4PH / SUS630) and it is not intended for the most aggressive chloride environments.

4. Khả năng chống mài mòn và chống mòn tuyệt vời

Due to alloying additions of Mo, Cu and Nb and its hardened martensitic + precipitate microstructure, 3S144 offers:

• Outstanding anti-galling performance

• Rất tốt wear and fretting corrosion resistance

• Stable surface behaviour under sliding or oscillating contact

These features make it ideal for shafts, bearings, fasteners, couplings and actuation components subject to repeated mechanical interaction.

5. Tính chất cơ học ổn định và khả năng chịu mỏi

The alloy exhibits:

• A stable, fine precipitation-hardened microstructure after ageing

• A well-balanced combination of high strength and useful toughness

• Reliable fatigue performance under cyclic loading

As a result, 3S144 is widely selected for high-integrity aerospace and defence hardware, including safety-critical components.

6. Bar Condition and Machinability

3S144 is typically supplied as bright drawn or ground bar and forgings for machining:

• Tốt dimensional accuracy and straightness

• Bề mặt nhẵn mịn suitable for precision turning, grinding and polishing

• Reasonable machinability for CNC operations, though generally more difficult to machine than austenitic grades such as 304 due to its higher hardness and strength

It is well suited to tight-tolerance mechanical parts that are finish-machined after heat treatment or supplied in a machinable condition followed by final ageing.

7. Vật liệu có thể từ hóa hoàn toàn

As a martensitic PH stainless steel, 3S144 is fully magnetic in all heat-treated conditions. This can be important in applications involving magnetic couplings, sensing, or assembly using magnetic tools and fixtures.

8. Độ tin cậy đạt tiêu chuẩn hàng không vũ trụ

Developed specifically for aerospace and defence applications within the BS S100 series, 3S144 provides:

• Aerospace-grade reliability and consistency

• Tight control of chemistry, cleanliness and heat treatment

• A long track record of proven performance in critical flight and defence hardware, such as shafts, fasteners, and actuation components

Tóm tắt trong một câu

3S144 is a very high-strength, Cu + Nb precipitation-hardening martensitic stainless steel bar grade with excellent galling and wear resistance, good corrosion resistance, stable fatigue performance and aerospace-grade reliability, ideal for highly loaded precision components in demanding mechanical and aerospace applications.