316 Stainless Steel Seamless Pipes & Tubes

 

The grade 316 stainless steel material consists of molybdenum added chromium in the nickel alloy steel. The Stainless Steel 316 Pipe and Tube has a high resistance to wear and tear and various other mechanical properties. They have high strength and are pretty resistant to corrosion. Compared to the ordinary 304 grade, the Stainless Steel 316 Pipe has higher physical properties, making it the second most popular stainless steel grade in the world. The SS 316 Seamless Pipe is widely used in industries like food processing, marine, seawater processing plant, nuclear power plant, heat exchangers, etc. Different types of boilers use Stainless Steel 316 Tube due to its high resistance to chloride-ion stress cracking. It means that the 316-grade stainless steel is capable of surviving in chloride ion-rich environments.

Stainless Steel 316 is the standard molybdenum-bearing grade, second in importance to SS 304 amongst the austenitic stainless steels. The molybdenum gives SS 316 better overall corrosion resistant properties than Stainless Steel 304, particularly higher resistance to pitting and crevice corrosion in chloride environments. Stainless Steel 316 has excellent forming and welding characteristics. It is readily brake or roll formed into a variety of parts for applications in the industrial, architectural, and transportation fields. SS 316 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections. SS 316L, the low carbon version of SS 316 and is immune from sensitisation (grain boundary carbide precipitation).SS 316H, with its higher carbon content has application at elevated temperatures, same as SS 316Ti which is a Titanium stabilised grade .SS 316N is nitrogen enhanced with greater strength than SS 316.

316 Stainless Steel Pipes and Tubes Product Range
316 Stainless Steel Pipes and Tubes Specifications: ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790
316 Stainless Steel Pipes and Tubes Sizes (Seamless): 1/2” NB - 16” NB
316 Stainless Steel Pipes and Tubes Sizes (ERW): 1/2” NB - 24” NB
316 Stainless Steel Pipes and Tubes Sizes (EFW): 6” NB - 100” NB

316 Stainless Steel Pipes and Tubes Wall Thickness available:
Schedule 5S - Schedule XXS (heavier on request)

316 Stainless Steel Pipes and Tubes Other Materials Testing:

NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc.

316 Stainless Steel Pipes and Tubes Dimensions:
All Pipes is manufactured and inspected/tested to the relevant standards including ASTM, ASME and API etc.


Type 316 Stainless Steel has excellent welding and deep drawing characteristics - it is easy to fabricate, easy to clean and aesthetically pleasing to the eye.
Applications of Grade 316 Stainless Steel


The steel is common throughout industry particularly in food processing as the material is not susceptible to corrosion from acids found in common foodstuffs. As a consequence, such steel is ideal for items such as sinks, work surfaces, preparation areas and refrigerators. It is also a perfect material for use in the pharmaceutical industry for environments such as clean rooms.

Grade 316 can also be found in heat exchangers, chemical containers, pipelines and throughout the brewing industry. It can be used as a fabricated material where high temperature petroleum gases or steam production gases are stored such as pressure vessels. It can even be found extensively in the construction industry where the material is used for cosmetic purposes such as building fascias.

316 plate and pipes have similar properties and in certain cases are stocked with Dual Certification, where it is concluded that each item has properties and a composition which comply with both steel types. Grade 316H cannot be included in this equation due to the steel's higher carbon content which is intended for use in elevated temperature applications.


316 Stainless Steel Pipes and Tubes Composition

Typical compositional ranges for grade 316 stainless steels are given in table 1.

Table 1. Composition ranges for 316 grade stainless steel


Grade C Mn Si P S Cr Mo Ni N
316 min. - - - - - 18.0 - 8.0 -
max. 0.08 2.0 0.75 0.045 0.030 20.0 10.5 0.10
316 min. - - - - - 18.0 - 8.0 -
max. 0.030 2.0 0.75 0.045 0.030 20.0 12.0 0.10
316H min. 0.04 - - - - 18.0 - 8.0 -
max. 0.10 2.0 0.75 0.045 0.030 20.0 10.5


316 Stainless Steel Pipes and Tubes Mechanical Properties

Typical mechanical properties for grade 316 stainless steels are given in table 2.

Table 2. Mechanical properties of 316 grade stainless steel

Grade Tensile Strength
(MPa) min
YieldStrength
0.2% Proof (MPa) min
Elongation
(%in 50mm) min
Hardness
Rockwell B (HR B) max Brinell (HB) max
316 515 205 40 92 201
316 485 170 40 92 201
316H 515 205 40 92 201
316H also has a requirement for a grain size of ASTM No 7 or coarser.


316 Stainless Steel Pipes and Tubes Physical Properties

Typical physical properties for annealed grade 316 stainless steels are given in table 3.

Table 3.
Physical properties of 316 grade stainless steel in the annealed condition

Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (m/m/0C) Thermal Conductivity (W/m.K) Specific Heat 0-1000C (J/kg.K) Electrical Resistivity (n.m)
0-1000C 0-3150C 0-5380C at 1000C at 5000C
316/L/H 8000 193 17.2 17.8 18.4 16.2 21.5 500 720


316 Stainless Steel Pipes and Tubes Grade Specification Comparison

Approximate grade comparisons for 316 stainless steels are given in table 4.

Table 4. Grade specifications for 316 grade stainless steel

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
316 S31600 316S31 58E 1.4301 X5CrNi18-10 2332 SUS 316
316 S31603 316S11 - 1.4306 X2CrNi19-11 2352 SUS 316
316H S31609 316S51 - 1.4948 X6CrNi18-11 - -
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.


316 Stainless Steel Pipes and Tubes Corrosion Resistance

Excellent in a wide range of atmospheric environments and many corrosive media. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 600C. Considered resistant to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 600C.


316 Stainless Steel Pipes and Tubes Heat Resistance

Good oxidation resistance in intermittent service to 8700C and in continuous service to 9250C. Continuous use of 316 in the 425-8600C range is not recommended if subsequent aqueous corrosion resistance is important. Grade 316 is more resistant to carbide precipitation and can be heated into the above temperature range.

Grade 316H has higher strength at elevated temperatures so is often used for structural and pressure-containing applications at temperatures above about 5000C and up to about 8000C. 316H will become sensitised in the temperature range of 425-8600C; this is not a problem for high temperature applications, but will result in reduced aqueous corrosion resistance.

316 Stainless Steel Pipes and Tubes Heat Treatment

Solution Treatment (Annealing) - Heat to 1010-11200C and cool rapidly. These grades cannot be hardened by thermaltreatment.