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317L Stainless Steel Pipe
317L a large type part of low-carbon austenitic stainless-steel pipe along with iron, chromium and molybdenum is their essential factor. It has been specifically formulated to offer improved corrosion resistance against a wide range of chlorides found in industrial service.
Key Characteristics:
317L contains low levels of Carbon and has a maximum carbon content of 0.03%, which means it is less susceptible to sensitisation during welding, helps in retaining the structure’s integrity.
Good Corrosion Resistance: The molybdenum content enhances the resistance to pitting and crevice corrosion in both a neutral/chloride environment.
Properties: Good mechanical properties can resist high temperature.
Common Applications:
The applications of 317L stainless steel pipe are widespread and used in the chemical processing, oil & gas, pharmaceuticals among other heavy duty industries that require a corrosion resistant/ durable hot rolled product.
Ultimately, 317L stainless steel pipe is a go-to solution or applications after high performance where corrosion resistance on the element of key properties.
Chemical composition
| Ni | Cr | Mo | Mn | Si | C | N | S | P | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 11.0 – 15.0 | 18.0 – 20.0 | 3.0 – 4.0 | 2.0 Max | .75 Max | 0.03 Max | 0.1 Max | 0.03 Max | 0.045 Max | Balance |
Machinability Rating and Comparison 317L Stainless Steel
Machinability Rating and Comparison
Compared to free machining grades such as 303, 317L stainless steel has a machinability of ~40-45%.
This rating means that 317L is machine able but at lower speeds, with proper tooling and process management in contrast to other more easily machined alloys.
Where Machining of 317L Stainless Steel Is Required.
When custom 317L stainless steel pipes must be made, it also often requires some machining in order to:
Fittings and connectors for the chemical processing equipment.
Marine and Desalination Flanges and Pipe Threads.
Precision components in power generation systems, wherever corrosion resistance is required.
Hot Rolling 317L Stainless Steel
317L stainless steel hot rolled product is shaped by the steel. In addition to conditioning the material, this also serves to enhance the material’s mechanical properties and microstructure to aid in more robust applications. Below is an overview of the hot rolling process and how it influences 317L stainless steel:
Hot Rolling of 317L Stainless Steel
Heating: The 317L stainless steel is initially heated into the 1700°F (927°C) range, above its recrystallization temperature. At this temperature the steel becomes malleable & can be shaped by using less force.
Rolling – The heated steel passes through a set of huge rollers that successively decrease its thickness and form it into its required shape, as a sheet, plate, or pipe. This temperature was used for rolling to ensure uniformity in structure and dimensions.
Maximized cooling after hot rolling, the hot-rolled steel is kept in the controlled cooling process, which can be made in the environment or with water if the requested properties require it. Start welding Operation of welding cooling is controlled a bit hard / fast quenching, the structure refinement of alloy grain, to determinate toughness and impact resistance.
Cold Rolling 317L Stainless Steel
317L stainless steel cold rolling is a precision process to shape the steel at room temperature to provide a high level of smooth surface finish, improved dimensional accuracy and better mechanical properties. Cold rolling works by strain hardening, refining the microstructure, and unlike hot rolling, occurs at low temperatures. Here is a breakdown of the process and advantages:
317L stainless steel cold rolling process
Step 1: Pre-treatment: The hot-rolled 317L stainless steel is washed for surface scales. Afterwards, the dough is divided into small pieces which will be used to create rolls.
Room – Temperature Rolling: The steel is subjected to a series of rollers at room temperature that compress it to a smaller thickness while improving the surface quality. This process of reduction ambles the strength and hardness of steel.
Annealing – if going the rolling route, the steel can be cold rolled, which acquires strain hardening to make it harder, yes, but also make it more brittle. Depending on its thickness, cold rolling may be followed by an annealing process to (i) restore ductility (ii) enhance softness (iii) refine microstructure. This comes in handy, especially when additional shaping or bending is necessary.
Surface Finish: The last cold rolled 317L stainless steel has smooth and shiny surface and limit dimension tolerance so it can be used in applications where high quality finish is required.
Application of 317L Stainless Steel
The 317L stainless steel is having the features like high strength capabilities and due to it, it has become good for widespread applications in industries. Check out the some essential uses of it:
317L Stainless Steel Applications
Chemical Processing: For use in the synthesis and storage of caustics, mineral acids and metal chlorides.
Oil and Gas: The pipeline, valves and fitting when used to be in contact with harsh environment as it can withstand the heavy corrosion medium.
Pharmaceuticals: Used in machinery and duct systems where cleanliness is top priority.
Food and Beverage Processing: Ensured tanks, piping and other equipment met UDWI health regulations.
Marine Applications: For applications in seawater and other saline environments, such as boat fittings, offshore constructions etc.
Power Generation: Employed in aggressive gas and high temperatures conditions (process parts of power plants).
Pollution Control: Utilized in scorchers and different gear intended for acidic or ignitable gases.
Textile Industry: Used in equipment for dyeing and other corrosive chemicals disinfection.