Stainless Steel 347 and 347H round bars are used in many industries. They are strong, heat-resistant, and long-lasting. These bars are made from austenitic stainless steel and are mainly used where high temperature and pressure are common.
Knowing how to choose the right stainless steel round bar for your job is important. Each project has different needs. The right material ensures safety, performance, and long-term use.
What Are SS 347 and 347H Round Bars?
SS 347 is a stainless steel that contains chromium and nickel with columbium (niobium). The columbium helps resist corrosion and makes the steel stable at high temperatures. It does not crack under heat stress environments.
SS 347H is a high-carbon version of 347. It has better strength at high temperatures. It is used in areas where the metal faces heat for a long time, like boilers and heat exchangers.
Both types are used in the form of round bars for structural support, fittings, and machined parts.
Key Features of Stainless Steel 347 / 347H Round Bars
Heat Resistance
These round bars can handle high heat. SS 347H performs better than 347 when temperatures stay high for long hours.
Corrosion Resistance
Both 347 and 347H bars are resistant to rust, and chemical attack. They are utilized in industries like chemical processing and oil refineries.
Strength and Stability
These bars stay strong after long use. They do not bend or crack under pressure or heat conditions.
Weldability
Stainless steel 347 and 347H are easy to weld. They do not form carbide precipitation during welding, so they remain strong and rust-free.
Formability
The ss 347H round bars are easy to cut, shape, and install. This makes them ideal for custom components.
Common Applications
Stainless steel 347 / 347H round bars are used in different industries. Here are some common uses:
- Heat exchangers
- Furnace parts
- Exhaust systems
- Aircraft parts
- Oil and gas equipment
- Power plant boilers
- Petrochemical plants
They are also used in food processing and pharmaceutical units where hygiene and corrosion resistance matter.
How to Choose the Right One for Your Project
Check Temperature Requirements
Choose SS 347H bars if the project involves high temperatures above 550°C. It can handle more heat due to higher carbon content. SS 347 round bar is ideal for lower or fluctuating temperatures.
Consider the Working Environment
If the environment has chemicals, moisture, or gases, stainless steel round bars are a good choice. SS 347 and 347H both perform well in harsh conditions.
Know the Load and Pressure Needs
For heavy loads and pressure, SS 347H bars offers more strength. It is utilized in pressure vessels and reactor equipment.
Think About Fabrication
Both SS 347 and 347H bars are easy to fabricate. SS 347 is better for fine machining or shaping. It has lower carbon, making it easier to work with.
Standards and Grades
Always choose bars that meet ASTM or ASME standards. This ensures quality and consistency. Stainless steel 347 / 347H round bars meet ASTM A276, A479, and A182 standards.
Finishes and Sizes Available
SS 347/347H round bars are available in different finishes and sizes. The finish affects both look and performance.
- Bright finish is smooth and used for visible parts.
- Black finish is common in heavy industry work.
- Rough turned or peeled finish is best for machining.
Sizes range from 5mm to 500mm in diameter. Custom sizes are also made as per project needs.
Storage and Handling Tips
- Store in dry, clean areas
- Keep away from carbon steel to avoid contamination
- Use proper lifting tools to avoid scratches or damage
- Handle carefully during transport
- Proper handling keeps the stainless steel round bars in good shape and prevents rusting or surface marks.
Final Thoughts
Choosing the right stainless steel 347 / 347H round bars is about knowing your project needs. These round bars offer strength, heat resistance, and corrosion protection. They are a reliable option for tough and high temperature areas.
Use SS 347 round bars for general use where heat and corrosion are present. Pick SS 347H bars when the heat stays high for long periods. Check the size, finish, and strength before placing an order.
With the right material, your project becomes safer and lasts longer. Stainless steel round bars like SS 347/347H ensure durability under pressure.
