Fittings and Flanges

Fittings and Flanges

SS 904L Fittings and SS 904L Flanges or UNS N08904 Flanges and Fittings is a superaustenitic stainless steel that is designed for moderate to high corrosion resistance in a wide range of process environments. The combination of high chromium and nickel content, coupled with additions of molybdenum and copper, assure good to excellent corrosion resistance

CHEMICAL PROPERTIES

GRADE

 

Cr

Ni

Mo

Mn

Si

P

Cu

S

C

N

Fe

SS 904L

Min

19

23

4

1

Max

23

28

5

2

1

0.045

2

0.03

0.02

0.1

BALANCE

Physical Properties

Grade

Density (g/cm3)

Elastic Modulus (GPa)

Mean Co-eff of Thermal Expansion (μm/m/°C)

Thermal Conductivity (W/m.K)

Melting Range

Specific Heat ( J/Kg.K)

Electrical Resistivity (Ω mm2/m)

   

20-100°C

at 100°C

0-100°C

at 20°C

SS 904L

8

190

15.3

12.9

1300-1390

450

1

Grade 904L is less resistant to nitric acid than grades 304L and 310L, which are free of molybdenum. This steel grade needs to be solution treated following cold working, to achieve maximum stress corrosion cracking resistance under critical environments.

Specification of Flange 

 The specified ASTM Standard Specification for Wrought Austenitic Stainless Steel 904L 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 Flanges

Grade

Tensile Strength

Yield Strength

Elongation

[MPA]

[MPA]

(% in 50mm) min

SS 904L

490

215

35

According to  application and uses in pipes and tubes SS 904L Flanges are broadly grouped into different sort, for example, SS 321 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 904L 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 904L Fittings is ASTM A 403, having Specific manufacturing Standards as ASME/ANSI B16.9, ASME B16.28, MSS-SP-43. 

Mechanical Properties of Fittings

Grade

Tensile Strength

Yield Strength

Elongation

[MPA]

[MPA]

(% in 50mm) min

SS 904L

490

220

35

SS 904L 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.

Application

SS 904L Flanges and Fittings are utilized in multiple industrial needs, together with – Chemical Industries, Oil & Gas, Aerospace, organic compound, power station, Pulp & Paper, Environmental, Water comes & Engineering.