Chemical Composition Element Specified / Typical Range (wt. %) C ≤0.08 Mn ≤2.00 Si ≤1.00 P ≤0.045 S ≤0.030 Cr 17.0–19.0 Ni 9.0–12.0 Mo — N ≤0.10 Ti ≥5×C; ≤0.70 Fe Balance

Mechanical Properties Property Minimum / Requirement Tensile Strength, min. 515 MPa Yield Strength, 0.2%, min. 205 MPa Elongation, min. 30% Hardness As required by the applicable fitting specification

Chemical and petrochemical process piping Oil and gas transmission and production systems Power generation and utility piping Food, beverage and pharmaceutical systems Water treatment and desalination Marine and offshore piping

Chemical Composition Element Specified / Typical Range (wt. %) C ≤0.08 Mn ≤2.00 Si ≤1.00 P ≤0.045 S ≤0.030 Cr 17.0–19.0 Ni 9.0–12.0 Mo — N ≤0.10 Ti ≥5×C; ≤0.70 Fe Balance

Mechanical Properties Property Minimum / Requirement Tensile Strength, min. 515 MPa Yield Strength, 0.2%, min. 205 MPa Elongation, min. 30% Hardness As required by the applicable fitting specification

Chemical and petrochemical process piping Oil and gas transmission and production systems Power generation and utility piping Food, beverage and pharmaceutical systems Water treatment and desalination Marine and offshore piping

321 Stainless Steel Elbow

Grade: 321

Elbow types:

90° Long Radius, 90° Short Radius, 45° Elbow, 180° Return, 3D / 5D Elbow

Standards:

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

321 is a titanium-stabilized austenitic stainless steel based on the 304 family. Titanium reduces the tendency for chromium carbide precipitation during elevated-temperature exposure, making the grade useful for welded fittings subjected to heat and thermal cycling. It provides good general corrosion resistance together with good high-temperature stability and is commonly specified for thermal process piping, heat exchangers and petrochemical equipment.

Chemical Composition

Element	Specified / Typical Range (wt. %)
C	≤0.08
Mn	≤2.00
Si	≤1.00
P	≤0.045
S	≤0.030
Cr	17.0–19.0
Ni	9.0–12.0
Mo	—
N	≤0.10
Ti	≥5×C; ≤0.70
Fe	Balance

Mechanical Properties

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

Chemical and petrochemical process piping
Oil and gas transmission and production systems
Power generation and utility piping
Food, beverage and pharmaceutical systems
Water treatment and desalination
Marine and offshore piping

Introduction

Specification

Chemical Composition

Element	Specified / Typical Range (wt. %)
C	≤0.08
Mn	≤2.00
Si	≤1.00
P	≤0.045
S	≤0.030
Cr	17.0–19.0
Ni	9.0–12.0
Mo	—
N	≤0.10
Ti	≥5×C; ≤0.70
Fe	Balance

Mechanical

Mechanical Properties

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