EN 1.4568 Precipitation-hardening stainless steel composition
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What is EN 1.4568?
EN 1.4568, also known as 17-7 PH stainless steel (UNS S17700), is a high-strength precipitation-hardening stainless steel designed for applications requiring demanding fatigue strength, elastic properties, and dimensional stability. It can be processed into various practical product forms, including plates, coils, tubes, bars, and wires.
What is the ASTM equivalent of 1.4568 stainless steel?
The DIN 1.4568 stainless steel is equivalent to the American UNS S17700, commonly known as 17-7PH (Precipitation Hardening) stainless steel, with primary ASTM standards including ASTM A693 (for plates, bars, and shapes) and ASTM A705 (for forged products), as well as references in ASTM A313, ASTM A564, and ASTM A579, all typically identifying it as Grade 631.
Is EN 1.4568 the same as 17-4PH stainless steel?
EN 1.4568 is closely related to 17-4PH, but minor differences in composition and European standard requirements may exist. Always verify specifications for critical applications.
EN 1.4568 Chemical Composition
| Element | Symbol | Content (%) |
|---|---|---|
| Chromium | Cr | 16.0 – 18.0 |
| Nickel | Ni | 6.5 – 7.75 |
| Aluminum | Al | 0.75 – 1.50 |
| Carbon | C | ≤ 0.09 |
| Manganese | Mn | ≤ 1.00 |
| Silicon | Si | ≤ 1.00 |
| Phosphorus | P | ≤ 0.040 |
| Sulfur | S | ≤ 0.030 |
| Iron | Fe | Balance |
Mechanical Properties of EN 1.4568
| Property | Condition | Value |
|---|---|---|
| Tensile Strength | Aged | 1100 – 1400 MPa |
| Yield Strength | Aged | ≥ 1000 MPa |
| Elongation | Aged | 10 – 15% |
| Hardness | Aged | 36 – 44 HRC |
What heat treatment is required for EN 1.4568?
EN 1.4568 (17-7PH) requires a multi-step precipitation hardening heat treatment (age hardening) after forming in its soft, solution-treated state (Condition A) to achieve high strength, involving austenite conditioning, cooling to form martensite, and aging at specific temperatures like 510°C (RH950) or 565°C (TH1050) for different property profiles, with final properties depending on the chosen condition.
How corrosion-resistant is EN 1.4568 stainless steel?
EN 1.4568 (17-7PH) stainless steel offers good corrosion resistance, comparable to Type 301 or 304, excelling in strength, fatigue, and high-temperature applications, making it great for springs, aerospace parts, and chemical equipment where balanced properties are key, though its aluminum content requires clean processing for optimal performance.
Is EN 1.4568 easy to machine?
No, EN 1.4568 (17-7PH) is not considered easy to machine; it's a precipitation-hardening stainless steel known for excellent strength and hardness, especially when heat-treated, but this also makes it challenging to machine, requiring high cutting forces and specific strategies to manage its tendency to work harden and avoid tool wear, unlike free-machining grades like 303.
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