Ferritic SS 430 Fittings and Flange

Ferritic SS 430 Fittings and Flange

Grade 430 (UNS S43000) or SS 430 Fittings or SS 430 Flanges are the most widely used family of Ferritic alloys. It is known for its good corrosion resistance to numerous substances, excellent stress, and formability, coupled with practical mechanical properties.

Chemical Composition

GRADE   Ni Cr Si C Mn P S Mo Fe
SS 430 Min 16  
Max 0.5 18 1 0.12 1 0.04 0.03 BALANCE

SS 430 offers exceptional resistance to corrosion by sulphuric and phosphoric acids and is often the most cost effective alloy in sulphuric acid service. The additions of copper and molybdenum increase its resistance to general stress corrosion and to specific attacks such as crevice corrosion.

Mechanical Properties

Grade Tensile Strength Yield Strength Elongation Hardness, MAX  
[MPA] [MPA] (% in 50mm) min HBW HRB
SS 430 450 205 30 89 183

SS 430 Fittings and SS 430 Flanges have excellent corrosion resistance in a wide range of chemicals, especially in acidic chloride environments such as those encountered in pulp and paper mills. Increased levels of chromium, nickel and molybdenum compared to 316L stainless steel improve resistance to chloride pitting and general corrosion. 

Physical Properties

Density (g/cm3) Elastic Modulus (GPa) Mean Co-eff of Thermal Expansion (μm/m/°C) Thermal Conductivity (W/m.K) Specific Heat (J/Kg.K) Electrical Resistivity (μΩ.m)
0-100°C 0-315°C 0-538°C at 100°C at 500°C 0-100°C
SS 430 7.8 200 10.4 11 11.4 26.1 26.3 460 600

Specification of Flange 

The specified ASTM Standard Specification for Wrought Ferritic SS 430 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.

According to application and uses in pipes and tubes SS 430 Flanges are broadly grouped into different sort, for example, 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 430 Flanges 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 Ferritic SS 430 Fittings is ASTM A403, having Specific manufacturing Standards as ASME/ANSI B16.9, ASME B16.28, MSS-SP-43. 

SS 430 Fittings that 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


  • Aerospace – piston engine manifolds
  • Chemical Processing
  • Expansion Joints
  • Food Processing – equipment and storage
  • Petroleum Refining – polythionic acid service
  • Waste Treatment – thermal oxidizers