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Passivated stainless steel tubing

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What is passivated stainless steel tubing?

Passivation is a process wherein nitric acid or citric acid is used for removing free iron from the surface of the ss. Due to the treatment, the Passivated Stainless Steel Tubing comes with a protective oxide layer known as a passivation film. This layer makes it less likely for the pipes to chemically react with air, which might lead to corrosion. Thus, it can be said that the passivation process resists rust. The most widely used industry standards that represent passivated ss are ASTM A967 and AMS 2700. This is a post-fabrication practice that comes with benefits like:

  • The process helps in the formation of a chemical barrier against rust.
  • Passivating stainless steel pipe have high durability and extended service life.
  • It helps to remove various contaminants from the surface of the product.
  • It requires less maintenance.

SS 304 passivated tubes manufacturer in India

Passivated stainless steel tubing manufacturer in India

ASTM A967 and AMS 2700

The ASTM A967 SS 304 Passivated Tubes allows using a mix of nitric acid and water. However, the ASTM A2700 defaults to the nitric acid formulations. AMS 2700 comes with a maximum concentration of iron, which cannot be found in the ASTM A967 standard. Also, the ASTM 2700 exempts 440C from testing. The ASTM A967 standard is more used by general industries, whereas ASTM A2700 is a standard use by the aerospace industry.

Leading Pickling passivation stainless steel pipe supplier in Gujarat, Check its specifications

Passivated stainless steel tubing

Passivated stainless steel tubing

SS 304 passivated tubes

SS 304 passivated tubes

Pickling passivation stainless steel pipe

Pickling passivation stainless steel pipe

What is the difference between nitric and citric passivation?

Compared to the nitric acid Pickling passivation stainless steel pipe, the citric passive products are more environmentally friendly. There is no emission of nitrogen oxide vapors which contributes to smog, acid rain and ozone layer depletion. Also, citric acid is safer and does not require special handling or constant overseeing. It does not corrode other equipment.

The citric acid 316 Stainless Steel Passivated Tubes are a newer concept than passivation by nitric acid. It removes the free irons and forms a passive oxide layer on the surface which helps to resist corrosion.

Passivating stainless steel pipe as per ASTM A967/ A380, AMS 2700, FED-QQ-P-35 standards in India

Table of Contents


Passivated stainless steel tubing manufacturer

Passivated stainless steel tubing specifications

Processing Surface Treatment End
Diameter Material Wall Thickness
0.25-22mm Stainless Steel 304,316 0.02-3mm
Griding, slotting, swaging, welding, cutting, bending, flaring Polished,Bright round/ closed end
316 stainless steel passivated tubes offer with inspection & testing such as PMI Test, Micro & Macro Test

Types of Passivated SS tubing

Passivating stainless steel pipe

Passivating stainless steel pipe

316 stainless steel passivated tubes

316 stainless steel passivated tubes

Stainless steel 304 passivated tubes

Stainless steel 304 passivated tubes

Stainless steel 304 passivated tubes suitable for 1000°F (537°C) temperature

SS 304 passivated tubes equivalent

STANDARD AFNOR EN WERKSTOFF NR. JIS UNS BS GOST
SS 316 Z7CND17‐11‐02 X5CrNiMo17-12-2 / X3CrNiMo17-13-3 1.4401 / 1.4436 SUS 316 S31600 316S31 / 316S33 –
SS 316L Z3CND17‐11‐02 / Z3CND18‐14‐03 X2CrNiMo17-12-2 / X2CrNiMo18-14-3 1.4404 / 1.4435 SUS 316L S31603 316S11 / 316S13 03Ch17N14M3 / 03Ch17N14M2
SS 317L – X2CrNiMo18-15-4 1.4438 SUS 317L S31703 – –
SS 304 Z7CN18‐09 X5CrNi18-10 1.4301 SUS 304 S30400 304S31 08Х18Н10
SS 304L Z3CN18‐10 X2CrNi18-9 / X2CrNi19-11 1.4306 / 1.4307 SUS 304L S30403 3304S11 03Х18Н11
SS 310 – X15CrNi25-20 1.4841 SUS 310 S31000 310S24 20Ch25N20S2
SS 321 – X6CrNiTi18-10 1.4541 SUS 321 S32100 – –
SS 347 – X6CrNiNb18-10 1.4550 SUS 347 S34700 – 08Ch18N12B
SS 904L Z2 NCDU 25-20 X1NiCrMoCu25-20-5 1.4539 SUS 904L N08904 904S13 STS 317J5L

Pickling passivation stainless steel pipe chemical composition

Grade Mn C Cr N Mo Ni Si P S Fe Ti
SS 316L min. 16.0 2.03.0 10.0
max. 2.0 0.035 18.0 14.0 0.75 0.045 0.030
SS 317L 2.0 max 0.035 max 18.00 20.00 3.00 4.00 11.00 15.00 1.0 max 0.045 max 0.030 max 57.89 min
SS 321 2.0 max 0.08 max 17.00 19.00 0.10 max 9.00 12.00 1.0 max 0.045 max 0.030 max 5(C+N) 0.70 max
SS 304 min. 18.0 8.0
max. 2.0 0.08 20.0 0.10 10.5 0.75 0.045 0.030
SS 304L min. 18.0 8.0
max. 2.0 0.030 20.0 0.10 12.0 0.75 0.045 0.030
SS 310 2 max 0.015 max 24.00 26.00 54.7 min 0.10 max 19.00 21.00 0.015 max 0.020 max 0.015 max
SS 316 min. 16.0 2.03.0 10.0
max. 2.0 0.035 18.0 14.0 0.75 0.045 0.030
SS 347 2.0 max 0.08 max 17.00 20.00 9.0013.00 1.0 max 0.045 max 0.030 max
SS 904L min. 19.0 0.10 4.00 23.00
max. 2.00 0.20 23.0 0.25 5.00 28.00 1.00 0.045 0.035

Passivating stainless steel pipe mechanical properties

Grade Melting Point Density Yield Strength (0.2%Offset) Tensile Strength Elongation
SS 304/ 304L 1400 °C (2550 °F) 8.0 g/cm3 Psi 30000 , MPa 205 Psi 75000 , MPa 515 35 %
SS 316L 1399 °C (2550 °F) 8.0 g/cm3 Psi 30000 , MPa 205 Psi 75000 , MPa 515 35 %
SS 321 1457 °C (2650 °F) 8.0 g/cm3 Psi 30000 , MPa 205 Psi 75000 , MPa 515 35 %
SS 310 1402 °C (2555 °F) 7.9 g/cm3 Psi 30000 , MPa 205 Psi 75000 , MPa 515 40 %
SS 306 1400 °C (2550 °F) 8.0 g/cm3 Psi 30000 , MPa 205 Psi 75000 , MPa 515 35 %
SS 347 1454 °C (2650 °F) 8.0 g/cm3 Psi 30000 , MPa 205 Psi 75000 , MPa 515 35 %
SS 904L 1350 °C (2460 °F) 7.95 g/cm3 Psi 32000 , MPa 220 Psi 71000 , MPa 490 35 %

Applications of 316 stainless steel passivated tubes

  • Refining
  • Refrigeration
  • Petrochemical
  • Gas transmission
  • Pulp and paper
  • Heating and Air Conditioning
  • Chemical & Electric Power

316 SS passivated tubes tolerance

NOM1
inch		 NOM3
milimeter		 NOM2
milimeter
0.750 20 19.05
0.875 22 22.22
1.000 25 25.40
1.250 30 31.75
0.250 6 6.35
0.312 8 7.94
0.375 10 9.52
0.500 12 12.70
0.625 16 15.88
1.500 38 38.10
2.000 50 50.8

Stainless steel 304 passivated tubes dimensions

Dimensions Wall Weight per Dimensions Wall Weight per
(milimeter) (milimeter) metre (kg) (milimeter) (milimeter) metre (kg)
20 x 20 1.50 0.88 50 x50 2.00 3.08
20 x 20 2.00 1.19 50 x50 3.00 4.65
25 x 25 1.20 0.92 60 x60 2.00 3.71
25 x 25 1.50 1.14 60 x60 3.00 5.49
12.7 x 12.7 1.20 0.44 40 x40 1.20 1.49
12.7 x 12.7 1.50 0.55 40 x40 1.50 1.85
15 x 15 1.20 0.53 40 x40 2.00 2.45
15 x 15 1.50 0.65 40 x40 3.00 3.75
20 x 20 1.20 0.71 50 x50 1.50 2.32
25 x 25 2.00 1.49 70 x70 3.00 6.53
25 x 25 3.00 2.20 80 x80 2.00 4.98
30 x 30 1.20 1.10 80 x80 3.00 7.53
30 x 30 1.50 1.37 100 x 100 2.00 6.40
30 x 30 2.00 1.84 100 x 100 3.00 9.53
30 x 30 3.00 2.72

Passivating SS pipe pressure rating

Pipes O.D.
(in.)		 Wall Thickness of Pipes/Tube (inches)
.028 .035 .049 .065 .083 .095 .109 .120
Working Pressure (psig)
3/8 3100 4400 6100
1/2 2300 3200 4400
1/8 7900 10100
1/4 3700 4800 7000 9500
5/16 3700 5400 7300
3/4 2200 3000 4000 4600
1 2200 2900 3400 3900 4300