17-4 Stainless Steel
17-4 Stainless Steel is martensitic precipitation-hardening steel that provides an outstanding combination of high strength, good corrosion resistance and good mechanical properties at temperatures up to 600 °F.

17-4 Stainless Steel
17-4 stainless steel, is a common and exceptionally durable type of steel used in a diverse variety of industries and applications.
17-4 stainless steel, is a common and exceptionally durable type of steel used in a diverse variety of industries and applications.
The 17-4 alloy gets its moniker from its composition of 17% Chromium and 4% Nickel, with a touch of 3% Copper.
Its unique blend of metals gives 17-4 the ability to offer a perfect balance of strength, hardness, and moderate corrosion resistance, making it a top choice for various applications.
From architectural paneling and molding to kitchen and food industry equipment, 17-4 finds widespread use in a number of industries, including the pulp and paper sector, and even as a material for nuclear waste casks.
This versatile alloy can be molded and shaped to fit a wide range of needs, making it a popular choice for engineers and designers alike.
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17-4 Stainless Steel Properties and Specifications
17-4 Stainless steel is a Chromium-nickel grade of Stainless Steel. It is hardened by a single low-temperature precipitation-hardening treatment which provides the stainless steel with excellent mechanical properties at a high strength level. It should not be used in the solution treated condition.
17-4 stainless steel is available in:
- Bar
- Wire
Type 17-4 is covered by the following specifications:
- AMS 5643
- ASTM A 564 Type 630
- 17-4 stainless steel has a machinability rating of 48% in the annealed condition (Condition A), with surface cutting speed of 80 feet per minute.
- In the overaged condition (H 1150-M), the machinability rating is 76% with surface cutting speed of 125 feet per minute.
- Forge the stainless steel between 2050 and 2150° F.
- Do not forge below 1850° F.
- Forgings are air-cooled to 90° F or lower.
- Large or intricate forgings should be equalized at some temperature between 1900° F and the forging temperature before air-cooling.
What is 17-4 Stainless Steel?
17-4 steel is a popular choice among engineers and designers for its unique composition of 17% Chromium, 4% Nickel, and 3% Copper. This combination gives it incredible strength, hardness, and moderate resistance to corrosion.
This superalloy is used in a variety of industries, including aerospace and defense, as well as in the manufacture of kitchen equipment and food industry machinery. It’s even used in the production of architectural paneling and as a material for nuclear waste casks.
17-4 stainless steel is useful because it can be molded into any form, making it a go-to choice for those looking for durable and high-performing steel. And with its unbeatable combination of properties, you can’t go wrong with 17-4. Whether it’s for a big project or a small one, this alloy is sure to impress.
History of 17-4 Stainless Steel
17-4 stainless steel was developed with the intention of creating steel that was highly durable and resistant to corrosion. It has established itself as a superb option throughout time for a variety of industries, including aerospace, defense, food processing, architecture, and even the nuclear waste industry.
One of the best qualities of 17-4 steel is its adaptability. It can be molded into many different shapes, making it appropriate for a variety of purposes. It makes sense why it remains a top option for engineers and designers today.
17-4 stainless steel has a long history of being a dependable and effective alloy. It is a highly sought-after material for various industries due to its mix of toughness, hardness, and corrosion resistance. Regardless of the size of your project, this alloy will undoubtedly accomplish the job well.
Applications for 17-4 Steel
Today, 17-4 steel continues to be a go-to choice for many engineers and designers due to its impressive combination of properties and versatility.
Whether you’re working on a big project or a small one, this alloy is sure to get the job done right. So, if you’re looking for durable and high-performing steel, 17-4 might just be the perfect choice for you.
Defense and Aerospace
Food processing
Architectural industries
Paper and Pulp
Nuclear waste casks
Kitchen equipment
17-4 Stainless Steel Composition & Properties
Properties
Type 17-4%
Carbon
.07 max
Manganese
1.00 max
Phosphorus
.04 max
Sulfur
.03 max
Silicon
1.00 max
Chromium
15.50 – 17.50
Nickel
3.0 – 5.0
Copper
3.0 – 5.0
Columbium Plus Tantalulm
.15 – .45
Mechanical Properties
Properties
Annealed
H900
H1150
Tensile Strength, psi
150,000
200,000
154,000
Yield Strength, psi
110,000
185,000
125,000
Elongation in 2?
10%
14%
19%
Reduction of area
40%
50%
60%
Rockwell C Hardness
34
44
33