Stainless Steel 316-316L
GENERAL PROPERTIES:
Stainless Steel 316 and 316L are high-performance austenitic stainless steels known for their superior corrosion resistance, especially in chloride-rich and marine environments. Thanks to their molybdenum (Mo) content, they provide excellent resistance to pitting, crevice corrosion, and chemical attack—much higher than Grade 304.
CHEMICAL COMPOSITION
|
Element
|
316L (%) | |
| 0.03 max | ||
| Balance Fe |
MECHANICAL PROPERTIES
| Property | 316 | 316L |
| Tensile Strength | 515–690 MPa | 485–620 MPa |
| Yield Strength | 205 MPa | 170 MPa |
| Elongation | 40% min | 40% min |
| Hardness | 217 HB max | 217 HB max |
PHYSICAL PROPERTIES
| Property | Value |
| Thermal Conductivity | 16.3 W/m·K |
| Electrical Resistivity | 0.74 µΩ·m |
| Modulus of Elasticity | 193 GPa |
| Magnetic | Non-magnetic (slight after cold work) |
EQUIVALENT GRADE
| Standard | 316 | 316L |
| AISI / ASTM | 316 | 316L |
| EN | 1.4401 | 1.4404 |
| JIS | SUS 316 | SUS 316L |
| DIN | X5CrNiMo17-12-2 | X2CrNiMo17-12-2 |
KEY PROPERTIES
- WELDING CHARACTERISTICS: This alloy is suitable for welding. All the standard fusion methods can be used, for its welding, and there is no heat treatment required later. However, the oxyacetylene process does not apply to this alloy.
The welding can be done, with filler metals with molybdenum content higher than the base metal or even without any filler metals. 316 L does not require post-weld annealing. However, some of the heavy weld sections of Grade 316 require post-weld annealing. It is, usually done to maximise corrosion resistance. - STAINLESS STEEL 316 HEAT TREATMENT: The internal stresses in the alloy are removed, in the process of annealing. Stainless steel 316 should be heated, at a temperature of 1900°F. It is then cooled rapidly with the water being, quenched. However, type 316/316L cannot be hardened through heat treatment.
- STAINLESS STEEL 316 PROCESSING – HOT FORMING: The hot working processes take place under the extreme temperatures of 1700- 2200°F. The forgings can be further, annealed at the required temperature of 1900°F. With this, the alloy can be, physically deformed, allowing it to recrystallise.
- STAINLESS STEEL 316 PROCESSING- COLD FORMING: In the cold working processes, the alloy can be completely fabricated and formed conveniently. The method includes various steps like squeezing, bending, shearing, drawing, upsetting and heading. All these steps ensure that the material has increased strength and hardness. However, in this process, the material can gain some magnetic properties, although originally it is non-magnetic.
- STAINLESS STEEL 316 MACHINABILITY: This alloy is put, under work hardening during the deformation, for efficient operation, slow speed, outstanding lubrication, heavier feeds, acute tooling and robust and firm equipment.
STAINLESS STEEL 316 CORROSION RESISTANCE:
Stainless steel 316 shows resistance to corrosion in many corrosive media and atmospheric environments. For mediums containing halides and chlorides, the constituent molybdenum ensures resistance to corrosion. The addition of molybdenum provides improved resistance to pitting and crevice corrosion in environments containing chlorides and other halides.
However, it sometimes shows surface corrosion. It can be seen in the faint brown stains and is usually, caused because of cracks and rough surface finishing. At ambient temperatures, it is also resistant to drinking water with up to about 1000 mg/L chlorides.
It is commonly used by many process industries to handle many chemicals. Even though it is referred, to as “marine grade stainless steel”, it is not resistant to warm seawater. In the as-welded condition, it also shows resistance to intergranular corrosion.
STAINLESS STEEL 316 HEAT RESISTANCE:
Stainless steel 316 has good creep resistance and has high strength at increased temperatures which makes it suitable for using it for structural and pressure-containing applications. The creation of an oxide layer usually provides the scaling resistance.
The other two features that provide the alloy with good heat resistance are its stable microstructure and its high mechanical load. If the alloy is subjugated to 870°C intermittently and 925 °C continuously, the alloy will show good oxidation resistance. For water corrosion resistance, it is, advised that the continuous application of the temperature range 425-860 °C is avoided. It also shows resistance to carbide precipitation.
DUAL CERTIFICATION:
The Grade Stainless steel 316 is classified under the “Dual Certified type” as it is stocked and found mainly in the form of plate and pipe. The items under this certification have specifications that consist of the mechanical and chemical properties of both 316 and 316L types.
With this certification, both the lower carbon limit of 316L and the upper limit of 316 are, met. However, due to discrepancy within the high-temperature application, the certification is not extended to type 31. It also meets all the AMS, ASTM, ASME, QQS, and MIL-S specifications.
STAINLESS STEEL 316 APPLICATIONS:
Benches and equipment for the laboratories: Being very easy to clean and multipurpose, this alloy is very suitable for the laboratory equipment and benches.
- Food and Beverage industry: The intrinsic property of STAINLESS STEEL 316 to be resistant to corrosion makes its way to the food and beverage industry. From storage to transportation and from easy cleaning to sterilisation, this type is very beneficial to the industry.
- Heat exchangers: Being resistant to corrosion and having high durability, Grade 316/316L is a highly reliable choice for being used in heat exchangers.
- Textile industry: This type of stainless steel endures deterioration with its inherent properties of strength and high-resistance, making it the most suitable for the textile industry.
- Petrol industry: Stainless steel 316 is known for the formation of oxide layers that inhibit the process of oxidation. This property is useful for the petrol industry. Moreover, the high heat resistance of the alloy makes it very suitable for the petrol industry.
- Nuclear reactors: Grade 316/316 L is known to be of big use to the nuclear industry. The nuclear reactors have to be made out of the best material to ensure safe chemical reactions.
This alloy is very resistant to corrosion, can handle extreme temperatures, is durable and holds immense strength, making it a safe choice for nuclear reactors. The high mechanical formability is very advantageous to nuclear power plants.
To know more about our Stainless Steel Bright Round Bars product and other stainless steel products, please enquire now.
316/316L Round Bars 316 Fine Wire
316/316L Hex Bars 316 Core Wire
316/316L Flat Bars 316 Cold Heading Wire
316/316L Square Bars 316 General Application Wire
316/316L Angle Bars 316 TIG Wire
316 MIG Wire
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