Chemical Composition Element Content (wt. %) C ≤0.040 Si ≤1.00 Mn ≤1.50 P ≤0.040 S ≤0.030 Cr 24.0–27.0 Ni 4.5–6.5 Mo 2.9–3.9 N 0.10–0.25 Other Cu: 1.5–2.5; Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Solution treated / pipe reference ≥760 ≥550 ≥15 ≤297 HB / ≤31 HRC

Offshore equipment Seawater piping Oil and gas systems Chemical processing Desalination High-strength process piping

Chemical Composition Element Content (wt. %) C ≤0.040 Si ≤1.00 Mn ≤1.50 P ≤0.040 S ≤0.030 Cr 24.0–27.0 Ni 4.5–6.5 Mo 2.9–3.9 N 0.10–0.25 Other Cu: 1.5–2.5; Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Solution treated / pipe reference ≥760 ≥550 ≥15 ≤297 HB / ≤31 HRC

Offshore equipment Seawater piping Oil and gas systems Chemical processing Desalination High-strength process piping

255 Stainless Steel Seamless Pipe

Grade: 255/S32550/1.4507

Size:

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

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

Standard: ASTM A312, ASTM A213 etc.

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

255 Stainless Steel Pipe, UNS S32550, is a super duplex stainless steel combining high strength with strong resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. Its chromium, molybdenum, copper, nickel, and nitrogen additions support performance in aggressive environments. 255 pipe is used in offshore systems, seawater equipment, chemical processing, oil and gas facilities, and high-strength corrosion-resistant piping.

Chemical Composition

Element	Content (wt. %)
C	≤0.040
Si	≤1.00
Mn	≤1.50
P	≤0.040
S	≤0.030
Cr	24.0–27.0
Ni	4.5–6.5
Mo	2.9–3.9
N	0.10–0.25
Other	Cu: 1.5–2.5; Fe: Balance

Mechanical Properties

Condition	Tensile Strength	Yield Strength (0.2%)	Elongation	Hardness
Solution treated / pipe reference	≥760	≥550	≥15	≤297 HB / ≤31 HRC

Offshore equipment
Seawater piping
Oil and gas systems
Chemical processing
Desalination
High-strength process piping

Introduction

Specification

Chemical Composition

Element	Content (wt. %)
C	≤0.040
Si	≤1.00
Mn	≤1.50
P	≤0.040
S	≤0.030
Cr	24.0–27.0
Ni	4.5–6.5
Mo	2.9–3.9
N	0.10–0.25
Other	Cu: 1.5–2.5; Fe: Balance

Mechanical

Mechanical Properties

Condition	Tensile Strength	Yield Strength (0.2%)	Elongation	Hardness
Solution treated / pipe reference	≥760	≥550	≥15	≤297 HB / ≤31 HRC