Chemical Composition Element Content (wt. %) C ≤0.080 Si ≤1.00 Mn ≤2.00 P ≤0.045 S ≤0.030 Cr 17.0–19.0 Ni 9.0–12.0 Mo — N ≤0.10 Other Ti: 5×C min., 0.70 max.; Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Solution annealed ≥515 ≥205 ≥35 ≤217 HB / ≤95 HRB

High-temperature piping Aerospace components Petrochemical equipment Heat exchangers Thermal processing equipment Engine and exhaust systems

Chemical Composition Element Content (wt. %) C ≤0.080 Si ≤1.00 Mn ≤2.00 P ≤0.045 S ≤0.030 Cr 17.0–19.0 Ni 9.0–12.0 Mo — N ≤0.10 Other Ti: 5×C min., 0.70 max.; Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Solution annealed ≥515 ≥205 ≥35 ≤217 HB / ≤95 HRB

High-temperature piping Aerospace components Petrochemical equipment Heat exchangers Thermal processing equipment Engine and exhaust systems

321 Stainless Steel Seamless Pipe

Grade: 321/S32100

Size:

Seamless: 6mm*1mm-720mm*50mm

Coiled: 4mm*0.5mm-32mm*3mm

Standard: ASTM A312, ASTM A213 etc.

Surface: No.1(Pickling), Bright(Polished)

321 Stainless Steel Pipe is a titanium-stabilized austenitic stainless steel designed for improved resistance to intergranular corrosion after exposure to elevated temperatures. It maintains good oxidation resistance, weldability, and mechanical strength at temperature. 321 pipe is commonly used in thermal processing, aerospace, chemical, petrochemical, exhaust, and high-temperature piping systems where conventional 304 stainless steel may experience sensitization.

Chemical Composition

Element	Content (wt. %)
C	≤0.080
Si	≤1.00
Mn	≤2.00
P	≤0.045
S	≤0.030
Cr	17.0–19.0
Ni	9.0–12.0
Mo	—
N	≤0.10
Other	Ti: 5×C min., 0.70 max.; Fe: Balance

Mechanical Properties

Condition	Tensile Strength	Yield Strength (0.2%)	Elongation	Hardness
Solution annealed	≥515	≥205	≥35	≤217 HB / ≤95 HRB

High-temperature piping
Aerospace components
Petrochemical equipment
Heat exchangers
Thermal processing equipment
Engine and exhaust systems

Introduction

Specification

Chemical Composition

Element	Content (wt. %)
C	≤0.080
Si	≤1.00
Mn	≤2.00
P	≤0.045
S	≤0.030
Cr	17.0–19.0
Ni	9.0–12.0
Mo	—
N	≤0.10
Other	Ti: 5×C min., 0.70 max.; Fe: Balance