Austenitic SS 317L Fittings and Flanges

Austenitic SS 317L Fittings and Flanges

317L stainless steel flange and 317L stainless steel fittings is a molybdenum bearing, low carbon content ” L ” grade austenitic stainless steel that provides improved corrosion resistance over 304L and 316L stainless steels. The low carbon provides resistance to sensitization during welding and other thermal processes.

Chemical Properties

SS 317L MIN % 11 18 3  
MAX % 15 20 4 0.03 2 0.045 0.03 BALANCE
SS 317 MIN %  
MAX % 13 19 3.5 0.08 2 0.045 0.03 BALANCE

SS 317L , with its stainless steel properties is used to compete with nickel and titanium based alloys for service in the most demanding conditions. It has the ability to withstand attack by highly corrosive chemicals so 317L flanges are used in chemical and petrochemical industrial sectors.


Grade Density (g/cm3) Elastic Modulus (GPa) Mean Co-eff of Thermal Expansion (μm/m/°C) Thermal Conductivity (W/m.K)
0-100°C at 100°C
SS 317/ 317L 8 193 16 16.3

Specification of Flange

The specified ASTM Standard Specification for Wrought Austenitic Stainless Steel Flanges is ASTM A182 with manufacturing standard such as ANSI/ASME B16.5, B16.48, BS4504, B 16.47 Series A & B, BS 10, EN-1092, DIN, etc.

Mechanical Properties Of Flange

Grade Tensile Strength Yield Strength Elongation Reduction of area
[MPA] [MPA] (% in 50mm) min min %
SS 317 515 205 30 50
SS 317L 485 170 30 50

According to application and uses in pipes and tubes SS 317L flanges are broadly grouped into different sort, for example, SS 316 Welding Neck Flange(WNF) & Long Welding Neck Flange(LWNF), Slip-on Flange(SOF), Lap Joint Flange(LJW), Blind Flange, Socket Welding Flange (SWF), Threaded Flange(THW), Plate Flange.

SS 317L Flange for the most part has different face type, for example, Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), blind flange, with various class rating as 50 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16,din 2.4856 , 25, 40 & ANSI B16.5.

Specification of Fittings

The Specification for Wrought Austenitic Stainless Steel Pipe Fitting is ASTM A403, having Specific manufacturing standards as ASME/ANSI B16.9, ASME B16.28, MSS-SP-43.

Mechanical Properties of Fittings

Grade Tensile Strength Yield Strength
SS 317/317L 515 205

SS 317L Fittings are categorically available are Elbow, Reducer, Tee, Coupling, Bend, Stub End, Cap, Nipple, Washer, Cross, Union etc which are available in different types such as Welded, Seamless and Fabricated having thickness range from 5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS available with NACE MR 01-75


Alloy 317/317L stainless steel flanges and fittings is a low-carbon, corrosion resistant steel used to handle sulfur, pulp liquor, acid dyestuffs, acetylating and nitrating mixtures, bleaching solutions, severe coal and oil smoke, and many chemical compounds. 317 & 317L Stainless steel, flanges and fittings are typically found in Paper and pulp handling equipment, Textile equipment, Food-processing equipment, Sea Water Equipment, Pharmaceutical Equipment.