17-4 PH Polished Round Bar – Features & Application

Stainless steels offer many unique advantages to wide industries. There are also numerous grades available, from which each stainless steel grade has its own set of advantages.  

Today we are going to talk about one of the popular and highly efficient  17-4 PH stainless steel round bars. This hard metal has many unique features and properties that make it the best choice for many industrial applications.

 17-4 PH stainless steel is the most used type of PH stainless steel, whether it is aerospace or the oil and gas industry; 17-4 PH polished round bars are chosen by wide industries. 

So let’s learn everything about the 17-4 PH polished round bar, its features, applications, properties, and a lot more. 

17-4 PH Polished Round Bar

17-4 PH polished stainless steel round bar is a precipitation hardened stainless steel alloy. It combines features of good corrosion resistance, high strength, and toughness.

Due to its toughness, the 17-4 PH polished stainless steel bar is highly preferred in industries like aerospace, nuclear energy, marine, and chemical processing industries.

Another growing application of the 17-4 PH polished round bar is the manufacturing of injection molds due to their high strength and wear resistance.  

The unique properties and features of the 17-4 PH polished round bar make it widely useful for manufacturing aircraft engines, gears, fittings, fasteners, valves, nuclear reactor components, paper mill equipment, and oil field parts.

17-4 PH Stainless Steel Properties  

17-4 PH Stainless Steel Physical Properties:

●    Melting Range: 2560-2625°F (1404-1440°C)

●    Density: 0.2820 lb/in³

17-4 PH Stainless Steel Mechanical Properties:

UTS (Tensile) Ksi(Mpa) .02% Yield Strength Ksi(Mpa) Elongation % in 2″ (51mm) Hardness Rockwell
160                        (1103) 145                       (1000) 5 35

17 4 PH Chemical Composition  

Composition(wt %)
Carbon (C)0.07 max.
Manganese (Mn)1.00 max.
Phosphorus (P)0.04 max.
Sulfur (S)0.03 max.
Silicon (Si)1.00 max.
Chromium (Cr) 15.00 – 17.50
Nickel (Ni)3.00 – 5.00
Copper (Cu)3.00 – 5.00
Niobium*plus0.03 max.
Tantalum (Nb)

17 4 PH Technical Specifications 

ASTMA564, A705 TYPE 630
ASMESA564, SA705 TYPE 630
DINEB 10088-3 W. Nr 1.4542

17-4 PH Polished Round Bar Features 

➱ High Strength

➱ High Strength

➱ High Corrosion Resistance

➱ Ease Of Fabrication

➱ Durable

➱ Improved Reliability

➱ Great Toughness

➱ High Yield Strength

➱ Good Heat Conductivity

➱ Weldability

Benefits Of Using 17-4 PH Polished Round Bar

17-4 PH stainless steel grade is a great combination of carbon, manganese, sulfur, silicon, phosphorus, copper, chromium, nickel, and niobium. As mentioned above, it has multiple benefitting features that are helpful for successful usage in a variety of applications.

But how do these features benefit industries? Let’s find out below.

Never Degrades: 

17-4 PH polished stainless steel round bar is used in applications where such material is required, which doesn’t degrade easily and stops working. In other words, where resistance and durability of machinery are needed.

For example, aerospace and refining machines need to last long without frequent maintenance or repair requirements. That’s why 17-4 PH polished stainless steel round bar is widely used in aerospace and chemical refining industries, as it can resist abrasive chemicals, provides excellent toughness and durability, and has a long service life. 


17-4 PH polished stainless steel round bar provides great strength, which is extremely important in refining equipment, processing equipment, and food preparation equipment. These machines have to go through demanding processes where higher strength is required to easily perform the same task repeatedly without any performance errors. 

Corrosion Resistance: 

Equipment in chemical processing and marine industries needs to be highly corrosion resistant as it can be exposed to salt water or acid-like substances. And 17-4 PH polished stainless steel round bar provides incredible corrosion resistance due to its high mechanical strength.

17-4 PH Polished Round Bar Applications 

Aerospace Industries 

Aerospace equipment has to work in a variety of environments and temperatures; hence, it is important to manufacture them using the strongest materials that have corrosion resistance ability and high strength. 

17-4 PH stainless steel bars are the best option for the aerospace industry. It provides excellent stress corrosion resistance and tensile strength that are crucial for airplane parts and components. 

Paper And Pulp Industries 

Equipment in the paper and pulp industry needs to be highly durable and corrosion-resistant in order to effectively perform under the most challenging conditions.

Since they need to operate with water and chemicals, these industries need a good stainless steel grade with strong corrosion resistance and durability to work in the toughest environment. 17-4 stainless steel bars are commonly used in the paper and pulp industry due to their adaptability to numerous positive features.

Food Processing Industry 

Hygiene is an integral part of the food industry, and the high chromium content of 17-4 PH grade makes it less prone to corrosion and makes it easy to clean.   

17-4 PH stainless steel is the first choice for manufacturing equipment for food processing applications. This is due to the good corrosion resistance ability and surface condition with great toughness and finish of 17-4 PH polished stainless steel bars. 

Nuclear Industry 

For the production of electricity, nuclear power plants need to use fuel, water, and chemicals. Hence, they need to use strong materials to manufacture their equipment which offers great toughness and corrosion resistance. Hence, the nuclear industry highly prefers to use stainless-steel grade 17-4 PH.

Marine Industry 

To survive exposure to salty seawater, the marine industry chooses 17-4 PH stainless steel polished bars as they provide superior resistance to corrosion and have high mechanical strength. 

Oil And Gas Industry

Usually, oil is obtained at great depths, and such depths are reached with high pressure. Secondly, equipment needs to handle a variety of corrosive media such as hydrogen sulfide gas and carbon dioxide. 

17-4 PH stainless steel polished bars are great construction materials that can withstand corrosive media and provide optimum piping performance at great depths.

To Conclude  

17-4 PH polished round bars are widely used due to their ideal combination of corrosion resistance, excellent mechanical properties at high temperatures, and high yield strength. This combination makes it ideal for many industrial applications. 

Lastly, if you are looking for a reliable manufacturer of 17-4 PH Stainless Steel Polished Round Bars to start your order, then get in touch with Vishwa Stainless Pvt. Ltd. today.

We are India’s most trusted manufacturer of stainless steel bright bars offering a wide range of stainless steel bars in different shapes or grades for different industrial applications. 

For any product requirements, feel free to contact us at sales@vishwastainless.com or call us today at +91-72111 24478

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