Chemical Composition Element Specified / Typical Range (wt. %) C ≤0.030 Mn ≤2.00 Si ≤1.00 P ≤0.030 S ≤0.020 Cr 21.0–23.0 Ni 4.5–6.5 Mo 2.5–3.5 N 0.08–0.20 Fe Balance

Mechanical Properties Property Minimum / Requirement Tensile Strength, min. 620 MPa Yield Strength, 0.2%, min. 450 MPa Elongation, min. 25% Hardness As required by the applicable fitting specification

Pump and equipment connections Process piping size transitions Chemical and petrochemical plants Oil and gas and energy systems Water treatment and desalination Food, pharmaceutical and general industrial piping

Chemical Composition Element Specified / Typical Range (wt. %) C ≤0.030 Mn ≤2.00 Si ≤1.00 P ≤0.030 S ≤0.020 Cr 21.0–23.0 Ni 4.5–6.5 Mo 2.5–3.5 N 0.08–0.20 Fe Balance

Mechanical Properties Property Minimum / Requirement Tensile Strength, min. 620 MPa Yield Strength, 0.2%, min. 450 MPa Elongation, min. 25% Hardness As required by the applicable fitting specification

Pump and equipment connections Process piping size transitions Chemical and petrochemical plants Oil and gas and energy systems Water treatment and desalination Food, pharmaceutical and general industrial piping

2205 Duplex Stainless Steel Reducers

Grade: 2205/S32205 /S31803

Types:

Concentric Reducer, Eccentric Reducer, Straight Reducer, Seamless Reducer, Welded Reducer

Standard:

ASME B16.9, EN 10253-4:2025, JIS B2312/2313

2205 is a duplex stainless steel combining austenitic and ferritic phases. It provides significantly higher yield strength than common austenitic grades while offering strong resistance to chloride pitting, crevice corrosion and stress-corrosion cracking. 2205 fittings are frequently selected for oil and gas, offshore, chemical, desalination and other applications where both mechanical strength and corrosion resistance are important.

Chemical Composition

Element	Specified / Typical Range (wt. %)
C	≤0.030
Mn	≤2.00
Si	≤1.00
P	≤0.030
S	≤0.020
Cr	21.0–23.0
Ni	4.5–6.5
Mo	2.5–3.5
N	0.08–0.20
Fe	Balance

Mechanical Properties

Property	Minimum / Requirement
Tensile Strength, min.	620 MPa
Yield Strength, 0.2%, min.	450 MPa
Elongation, min.	25%
Hardness	As required by the applicable fitting specification

Pump and equipment connections
Process piping size transitions
Chemical and petrochemical plants
Oil and gas and energy systems
Water treatment and desalination
Food, pharmaceutical and general industrial piping

Introduction

Specification

Chemical Composition

Element	Specified / Typical Range (wt. %)
C	≤0.030
Mn	≤2.00
Si	≤1.00
P	≤0.030
S	≤0.020
Cr	21.0–23.0
Ni	4.5–6.5
Mo	2.5–3.5
N	0.08–0.20
Fe	Balance

Mechanical

Mechanical Properties

Property	Minimum / Requirement
Tensile Strength, min.	620 MPa
Yield Strength, 0.2%, min.	450 MPa
Elongation, min.	25%
Hardness	As required by the applicable fitting specification