Chemical Composition Element Specified / Typical Range (wt. %) C ≤0.07 / ≤0.030 Mn ≤2.00 Si ≤1.00 P ≤0.045 S ≤0.030 Cr 18.0–20.0 Ni 8.0–11.0 Mo — N ≤0.10 Fe Balance

Mechanical Properties Property Minimum / Requirement Tensile Strength, min. 515 MPa (304) / 485 MPa (304L) Yield Strength, 0.2%, min. 205 MPa (304) / 170 MPa (304L) Elongation, min. 30% 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 ≤0.07 / ≤0.030 Mn ≤2.00 Si ≤1.00 P ≤0.045 S ≤0.030 Cr 18.0–20.0 Ni 8.0–11.0 Mo — N ≤0.10 Fe Balance

Mechanical Properties Property Minimum / Requirement Tensile Strength, min. 515 MPa (304) / 485 MPa (304L) Yield Strength, 0.2%, min. 205 MPa (304) / 170 MPa (304L) Elongation, min. 30% 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

304 / 304L Stainless Steel Reducers

Grade: 304/304L

Types:

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

Standard:

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

304 and 304L are widely used austenitic stainless steels for general-purpose piping fittings. They offer good corrosion resistance, excellent weldability and formability, and reliable performance in many industrial, food, water and process services. 304 is the standard general-purpose grade, while 304L has reduced carbon content and is particularly suitable for welded fittings where reduced sensitization is desired.

Chemical Composition

Element	Specified / Typical Range (wt. %)
C	≤0.07 / ≤0.030
Mn	≤2.00
Si	≤1.00
P	≤0.045
S	≤0.030
Cr	18.0–20.0
Ni	8.0–11.0
Mo	—
N	≤0.10
Fe	Balance

Mechanical Properties

Property	Minimum / Requirement
Tensile Strength, min.	515 MPa (304) / 485 MPa (304L)
Yield Strength, 0.2%, min.	205 MPa (304) / 170 MPa (304L)
Elongation, min.	30%
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	≤0.07 / ≤0.030
Mn	≤2.00
Si	≤1.00
P	≤0.045
S	≤0.030
Cr	18.0–20.0
Ni	8.0–11.0
Mo	—
N	≤0.10
Fe	Balance

Mechanical

Mechanical Properties

Property	Minimum / Requirement
Tensile Strength, min.	515 MPa (304) / 485 MPa (304L)
Yield Strength, 0.2%, min.	205 MPa (304) / 170 MPa (304L)
Elongation, min.	30%
Hardness	As required by the applicable fitting specification