17-4 stainless steel precipitation-hardens due to its martensitic nature and contains chromium, nickel, and copper. It is a great option for a variety of industrial applications due to its high strength and strong resistance to corrosion. We’ll look more closely at the characteristics and applications of 17-4 stainless steel in this blog post.
- What forms does Piping Mart provide for 17-4 stainless steel?
- Stainless Steel Pipes, 17-4
- 17-4 Bars and Tubing Made of Stainless Steel
- Stainless Steel Bolts, 17-4
- 17-4 Screw Made of Stainless Steel
- 17-4 Pipe Fittings Made of Stainless Steel
- 17-4 Coil and Foil Made of Stainless Steel
- 17-4 Stainless Steel Types
Types 630 and 631 are available in 17-4 stainless steel. The temperature range for annealing and hardening type 630 is 900°F (482°C) to 1150°F (621°C). This kind is typically applied to high-strength, corrosion-resistant general-purpose parts. Heat treating Type 631 to temperatures ranging from 1275°F (690°C) to 1325°F (720°C) anneals and hardens it. Parts that require more strength than Type 630 but less corrosion resistance are often made of this type.
- 17-4 Composition of Stainless Steel
One kind of Inconel sheet with a distinct composition is SS 17-4. Its main constituents are nickel, chromium, and iron. It also has 17%–4% carbon, silicon, manganese, and copper. When temperatures rise, this combination of properties makes 17-4 stainless steel extraordinarily ductile, robust, and resistant to corrosion. While copper aids in its strong resistance to stress-corrosion cracking, substantial concentrations of nickel also contribute to its low-magnetic characteristics. Because of its attractive characteristics, 17-4 stainless steel Inconel sheet is set to remain a great option for a range of building projects that call for strength and durability that lasts.
| Element | Content (%) |
| Iron, Fe | 73 |
| Chromium, Cr | 15.0 – 17.5 |
| Nickel, Ni | 3.0 – 5.0 |
| Copper, Cu | 3.0 – 5.0 |
| Manganese, Mn | 1.0 |
| Silicon, Si | 1.0 |
| Tantalum, Ta | 0.45 |
| Niobium, Nb (Columbium, Cb) | 0.45 |
| Nb + Ta | 0.15 – 0.45 |
| Carbon, C | 0.070 |
| Phosphorous, P | 0.040 |
| Sulfur, S | 0.030 |
- 17-4 Physical Properties of Stainless Steel
Stainless steel 17-4 is an advanced material with an amazing array of physical characteristics. This is a widely used Inconel sheet that is well-known for its toughness, strength at high temperatures, and resistance to corrosion. This special alloy has a hardness rating of 47 on the Rockwell “C” scale and provides exceptional fatigue and corrosion resistance. Because of its exceptional hardness, 17-4 stainless steel offers long-lasting defense against abrasions and scratches under demanding conditions. It is also perfect for applications requiring prolonged operational exposure to frigid temperatures due to its cryogenic characteristics. Because of its versatility, 17-4 stainless steel is a great option for anyone who require dependable metal goods with exceptional physical qualities.
- 17-4 Mechanical Properties of Stainless Steel
With its amazing mechanical qualities, 17-4 stainless steel is a unique metal that can be used for both structural and decorative purposes. Because of its low coefficient of friction, it is easy to mold, weld, and machine, making it a good choice for parts that need to be highly repeatable. It is extremely resistant to stress-cracking corrosion from chlorides because it is an Inconel sheet. Additionally, it has good performance in cryogenic settings and provides good thermal stability at temperatures as high as 600 degrees Celsius. 17-4 stainless steel is the metal of choice for many industries needing robust construction and outstanding performance standards because of its remarkable qualities.
| Properties | Metric | Imperial |
| Shear modulus | 77.4 GPa | 11200 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Hardness, Brinell | 352 | 352 |
| Hardness, Knoop (estimated from Rockwell C) | 363 | 363 |
| Hardness, Rockwell C | 36 | 36 |
| Hardness, Vickers (estimated from Rockwell C) | 349 | 349 |
- 17-4 Stainless Steel Specifications
- AISI 630
- AMS 5604
- AMS 5622
- AMS 5643
- ASTM A564 (630)
- ASTM A693 (630)
- ASTM A705 (630)
- MIL C-24111
- MIL P-47183
- MIL S-81591
- UNS S17400
- 17-4 Stainless Steel qualities:
Because of its great strength, UNS S17400 possesses exceptional mechanical qualities. It is perfect for a wide range of industrial uses, including machine tools, medical equipment, automobile parts, food processing equipment, aerospace components, marine hardware, and more. Because of its high nickel content, which helps it resist rusting in acidic situations, it also has great corrosion resistance. Furthermore, 17-4 stainless steel’s softness—even after heat treatment—allows for easy cold-working and machining.
- Corrosion Resistance:
The excellent corrosion resistance of 17-4 stainless steel is one of its main advantages. This kind of steel is resistant to corrosion in a range of settings, including basic and acidic ones. Furthermore, 17-4 stainless steel is not easily corroded by sulfates or chlorides.
- High Strength:
The strength-to-weight ratio of S17400 is likewise high. This indicates that it is robust enough to be utilized in settings where weight is an issue, like the aircraft sector. This kind of steel also has a high yield strength, which makes it perfect for use in high-stress components.
- High Thermal Conductivity
The excellent heat conductivity of 17-4 stainless steel is an additional advantage. This characteristic makes it perfect for use in heat exchangers and other applications where rapid heat transmission is required. Furthermore, this kind of steel has a low coefficient of thermal expansion, which implies that temperature fluctuations won’t cause it to expand or contract noticeably.
- Not Magnetic
The non-magnetic nature of 17-4 stainless steel is an additional benefit. Because of this characteristic, it is perfect for usage in devices like food processing equipment and medical equipment that have unwanted magnetic qualities. Furthermore, when exposed to a magnetic field, this kind of steel is resistant to magnetostriction, which prevents it from becoming magnetized.
- Excellent weldability
There is also good weldability in SS 17-4. This means that welding techniques like arc welding and gas tungsten arc welding can be used to quickly attach it to other types of metals. This kind of steel can also be welded using filler and standard metals.
- 17-4 Equivalent of Stainless Steel
The following table lists several designations that are comparable to grade 17-4 stainless steel.
| AISI 630 | ASTM A693 (630) | AMS 5342 | MIL-S-81506 |
| AMS 5604 | ASTM A705 (630) | AMS 5343 | SAE J467 (17-4PH) |
| AMS 5622 | MIL C-24111 | AMS 5344 | ASME SA705 |
| AMS 5643 | MIL P-47183 | AMS 5355 | ASME SA564 |
| ASTM A564 (630) | MIL S-81591 | AMS 5825 |
- 17-4 Uses of Stainless Steel
Numerous automotive and aerospace industries employ 17-4 stainless steel because of its outstanding mechanical qualities and resistance to corrosion. Because medical equipment like implants need materials with high mechanical strength that can resist sterilizing procedures without rusting over time, it is frequently utilized in these kinds of devices. Additionally, because it provides good corrosion resistance when exposed to acidic chemicals like vinegar or citrus fruits, it is frequently utilized in the production of food processing machinery. Because it can tolerate high temperatures without losing its mechanical qualities or corrosion, it is also frequently used in aircraft.
- In summary,
17-4 stainless steel possesses a variety of advantageous qualities that make it a good fit for the automotive and aerospace industries. It is the perfect material for people who want something that can endure harsh environments without losing its mechanical qualities over time because of its great strength and strong resistance to corrosion.