321 seamless stainless steel pipe

The 304 steel grade is modified by adding titanium (Ti) as a carbide-stabilizing element to suppress intergranular sensitization. This steel was developed for use within the sensitization temperature range (450°C–850°C). However, the addition of Ti results in a steel grade prone to defects such as inclusion lines and Ti-segregation streaks.

product details

PRODUCT INTRODUCTION

CHARACTERISTICS AND PRACTICAL USES

Differentiation

321

Attributes

Intended for use within the sensitization temperature range (450°C–850°C).

Applications

Components/equipment such as boiler heat exchangers, piping, and expansion joints that cannot

undergo post-weld heat treatment (PWHT) following welding and assembly processes.

CHEMICAL COMPOSITION(wt%)

Specifications

other

TYPE

321

≤0.080

≤1.00

≤2.00

≤0.045

≤0.030

≤17.0-9.00

≤9.00-13.00

Ti:≥5×C%

MECHANICAL PROPERTIES

Specifications

YS(Mpa)

TS(Mpa)

EL(%)

TYPE 321

≥205

≥520

≥40

≤200

APPLICATION AREA

Mechanical manufacturing, household appliances, pressure vessels, structural pipe fabrication, architectural decoration, chemical equipment, nuclear power, home appliances, catering kitchenware, elevators, solar energy, metal products, containers, automotive applications, precision electronics, rail transit, sanitary ware, food machinery.