Extra-large & Extra-thick
- International Standard
- Material Grades
- Outer Diameter
-
Wall Thickness
- Tube Type
- Mill Test Certificate(MTC)
- Certificate
- ASTM A312 , ASME SA312 , ASME B36.19
- TP304/304L, TP316/316L, TP309/309S, TP310/310S, TP321/321H, TP347/347H, Duplex2205 / S31803
-
DN6 - DN2000
1/8″ – 80″
10.3mm - 2032mm - 1mm - 60mm SCH 5S - SCH XXS
- Welded , Seamless
- EN10204 3.1
- ISO 9001:2015 , PED 2014/68/EU , AD 2000-WO
ASTM A312 Stainless Steel Pipe
- International Standard
-
Grades
- Outer Diameter
-
Wall Thickness
- Tube Type
- Certificate
- ASTM A312 , ASME SA312 , ASME B36.19
- TP304/304L, TP316/316L, TP309/309S, TP310/310S, TP321/321H, TP347/347H, Duplex2205 / S31803
-
DN6 - DN2000
1/8″ – 80″
10.3mm - 2032mm - 1mm - 60mm SCH 5S - SCH XXS
- Welded , Seamless
- ISO 9001:2015 , PED 2014/68/EU , AD 2000-WO
ASTM A312 is the standard specification for seamless, welded, and heavily cold-worked austenitic stainless steel pipe used in corrosive and high-temperature service. This page explains the standard’s scope, manufacturing routes, dimensions, testing, and available grades.
For grade-specific purchasing information, see ASTM A312 TP304, TP304L, TP316, and TP316L stainless steel pipe.
ANSI/ASME B36.19 DIMENSION
ASTM A312 stainless steel pipe sizes and dimensions should conform to ANSI B36.19, nominal pipe size (NPS) ranges from NPS 1/8 [10.29 mm] to NPS 80 [2032 mm], Schedule number for wall thickness from Sch 5s to Sch xxs, more Pipe Schedule Sizes are specified for special applications, the value stated respectively for a specific size, average wall and minimum wall pipe are available.
| Nominal Size | OD | Wall Thickness, SCHEDULE | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NPS | DN | mm | 5S | 10S | 10 | 20 | 30 | 40S | STD | 40 | 80S | XS | 80 | 100 | 120 | 140 | 160 | XXS | |
| 1∕8" | 6 | 10.3 | 1.24 | 1.73 | 1.73 | 1.73 | 2.41 | 2.41 | 2.41 | ||||||||||
| 1∕4" | 8 | 13.7 | 1.65 | 2.24 | 2.24 | 2.24 | 3.02 | 3.02 | 3.02 | ||||||||||
| 3∕8" | 10 | 17.2 | 1.65 | 2.31 | 2.31 | 231 | 3.2 | 3.2 | 3.2 | ||||||||||
| 1∕2" | 15 | 21.3 | 1.65 | 2.11 | 2.77 | 2.77 | 2.77 | 3.73 | 3.73 | 3.73 | 4.78 | 7.47 | |||||||
| 3∕4" | 20 | 26.7 | 1.65 | 2.11 | 2.87 | 2.87 | 2.87 | 3.91 | 3.91 | 3.91 | 5.56 | 7.82 | |||||||
| 1" | 25 | 33.4 | 1.65 | 2.77 | 3.38 | 3.38 | 3.38 | 4.55 | 4.55 | 4.55 | 6.35 | 9.09 | |||||||
| 1-1∕4" | 32 | 42.2 | 1.65 | 2.77 | 3.56 | 3.56 | 3,56 | 4.85 | 4.85 | 4.85 | 6.35 | 9.7 | |||||||
| 1-1∕2" | 40 | 48.3 | 1.65 | 2.77 | 3.68 | 3.68 | 3.68 | 5.08 | 5.08 | 5.08 | 7.14 | 10.15 | |||||||
| 2" | 50 | 60.3 | 1.65 | 2.77 | 3.91 | 3.91 | 3.91 | 5.54 | 5.54 | 5.54 | 8.74 | 11.07 | |||||||
| 2-1∕2" | 65 | 73 | 2.11 | 3.05 | 5.16 | 5.16 | 5.16 | 7.01 | 7.01 | 7.01 | 9.53 | 14.02 | |||||||
| 3" | 80 | 88.9 | 2.11 | 3.05 | 5.49 | 5.49 | 5.49 | 7.62 | 7.62 | 7.62 | 11.13 | 15.24 | |||||||
| 3-1∕2" | 90 | 101.6 | 2.11 | 3.05 | 5.74 | 5.74 | 5.74 | 8.08 | 8.08 | 8.08 | |||||||||
| 4" | 100 | 114.3 | 2.11 | 3.05 | 6.02 | 6.02 | 6.02 | 8.56 | 8.56 | 8.54 | 11.13 | 13.49 | 17.12 | ||||||
| 5" | 125 | 141.3 | 2.77 | 3.4 | 6.55 | 6.55 | 6.55 | 9.53 | 9,53 | 9.53 | 12.7 | 15.88 | 19.05 | ||||||
| 6" | 150 | 168.3 | 2.77 | 3.4 | 7.11 | 7.11 | 7.11 | 10.97 | 10.97 | 10.97 | 14.27 | 18.26 | 21.95 | ||||||
| 8" | 200 | 219.1 | 2.77 | 3.76 | 6.35 | 7.04 | 8.18 | 8.18 | 8.18 | 12.7 | 12.7 | 12.7 | 15.09 | 18.26 | 20.62 | 23.01 | 22.23 | ||
| 10" | 250 | 273.1 | 3.4 | 4.19 | 6.35 | 7.8 | 9.27 | 9.27 | 9.27 | 12.7 | 12.7 | 15.09 | 18.26 | 21.44 | 25.4 | 28.58 | 25.4 | ||
| 12" | 300 | 323.9 | 3.96 | 4.57 | 6.35 | 8.38 | 9.53 | 9.53 | 10.31 | 12.7 | 12.7 | 17.48 | 21.44 | 25.4 | 28.58 | 33.32 | 25.4 | ||
| 14" | 350 | 355.6 | 3.96 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 11.13 | 12.7 | 19.05 | 23.83 | 27.79 | 31.75 | 35.71 | ||||
| 16" | 400 | 406.4 | 4.19 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 12.7 | 12.7 | 21.44 | 26.19 | 30.95 | 36.53 | 40.49 | ||||
| 18" | 450 | 457.2 | 4.19 | 4.78 | 6.35 | 7.92 | 11.13 | 9.53 | 14.27 | 12.7 | 23.83 | 29.36 | 34.93 | 39,67 | 45.24 | ||||
| 20" | 500 | 508 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | 9.53 | 15.09 | 12.7 | 26.19 | 32.54 | 38.1 | 44.45 | 50.01 | ||||
| 22" | 550 | 558.8 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | 9.53 | 12.7 | 28.58 | 34.93 | 41.28 | 47.63 | 53.98 | |||||
| 24" | 600 | 609.6 | 5.54 | 6.35 | 6.35 | 9.53 | 14.27 | 9.53 | 17.48 | 12.7 | 30.96 | 38.89 | 46.02 | 52.37 | 59.54 | ||||
| 26" | 650 | 660.4 | 7.92 | 12.7 | 9.53 | 12.7 | |||||||||||||
| 28" | 700 | 711.2 | 7.92 | 12.7 | 15.88 | 9.53 | 12.7 | ||||||||||||
| 30" | 750 | 762 | 6.35 | 7.92 | 7.92 | 12.7 | 15.88 | 9.53 | 12.7 | ||||||||||
| 32" | 800 | 812.8 | 7.92 | 12.7 | 15.88 | 17.48 | 9.53 | 17.48 | 12.7 | ||||||||||
| 34" | 850 | 863.6 | 7.92 | 12.7 | 15.88 | 17.48 | 9.53 | 17.48 | 12.7 | ||||||||||
| 36" | 900 | 914.4 | 7.92 | 12.7 | 15.88 | 19.05 | 9.53 | 19.05 | 12.7 | ||||||||||
| 38" | 950 | 965.2 | - | 9.53 | 12.7 | ||||||||||||||
| 40" | 1000 | 1016 | - | 9.53 | 12.7 | ||||||||||||||
Mechanical Strenght
| SS Pipes Grade ASTM A312/ASME SA312 | Yield Strength N/mm2 (min) | Tensile Strength N/mm2 (min) | Elongation % (min) |
|---|---|---|---|
| TP304 | 205 | 515 | 35 |
| TP304L | 170 | 485 | 35 |
| TP316 | 205 | 515 | 35 |
| TP316L | 170 | 485 | 35 |
| TP321 | OD < 17,1 mm – 205 | OD < 17,1 mm – 515 | 35 |
| OD > 17,1 mm – 170 | OD > 17,1 mm – 485 |
Application
PRECISION ENGINEERED STAINLESS STEEL PIPE
Seamless and welded austenitic stainless steel pipe manufactured to ASTM A312 specifications. Engineered for demanding industrial, petrochemical, and architectural applications worldwide.
1/8"–30"
NPS Range
SCH 5–XXS
Schedule
TP304/316
Primary Grades
ISO 9001
Certified
Built to the Most Demanding Standards
ASTM A312 covers seamless, welded, and heavily cold-worked austenitic stainless steel pipe for high-temperature and general corrosive service.
Manufactured for Critical Infrastructure
Our ASTM A312 stainless steel pipe is produced using premium raw materials and controlled manufacturing processes that ensure consistent mechanical properties, dimensional accuracy, and superior corrosion resistance across every production lot.
Available in seamless (SMLS), welded (WLD), and heavily cold-worked (HCW) conditions, each product undergoes rigorous testing including hydrostatic, non-destructive electric, and mechanical testing per the standard requirements.
- Seamless, welded, and heavily cold-worked options
- Full range of schedules from SCH 5 through XXS
- Solution annealed or heat-treated condition
- Mill test certificates per EN 10204 3.1
- Third-party inspection available (SGS, Bureau Veritas, Lloyds)
Chemical & Mechanical Specifications
Key requirements per ASTM A312/A312M. Full test reports available upon request.
Chemical Composition (%)
- TP304
- TP304L
- TP316
- TP316L
- TP317L
- TP321
- TP347
- 0.08
- 0.03
- 0.08
- 0.03
- 0.03
- 0.08
- 0.08
- 2.00
- 2.00
- 2.00
- 2.00
- 2.00
- 2.00
- 2.00
- 0.045
- 0.045
- 0.045
- 0.045
- 0.045
- 0.045
- 0.045
- 0.03
- 0.03
- 0.03
- 0.03
- 0.03
- 0.03
- 0.03
- 0.75
- 0.75
- 0.75
- 0.75
- 0.75
- 0.75
- 0.75
- 18.0–20.0
- 18.0–20.0
- 16.0–18.0
- 16.0–18.0
- 18.0–20.0
- 17.0–19.0
- 17.0–19.0
- 8.0–11.0
- 8.0–12.0
- 10.0–14.0
- 10.0–14.0
- 11.0–15.0
- 9.0–12.0
- 9.0–13.0
- —
- —
- 2.0–3.0
- 2.0–3.0
- 3.0–4.0
- —
- —
Mechanical Properties
- TP304 / 304L
- TP316 / 316L
- TP317L
- TP321
- TP347
- 485 MPa (70 ksi)
- 485 MPa (70 ksi)
- 485 MPa (70 ksi)
- 515 MPa (75 ksi)
- 515 MPa (75 ksi)
- 170 MPa (25 ksi)
- 170 MPa (25 ksi)
- 205 MPa (30 ksi)
- 205 MPa (30 ksi)
- 205 MPa (30 ksi)
- 35%
- 35%
- 35%
- 35%
- 35%
- 201
- 217
- 217
- 217
- 201
Size Range & Tolerances
- NPS Range
- OD Tolerance
- WT Tolerance
- Length
- Schedule
- 1/8" – 40"
- ±0.008" (NPS < 1.5") / ±0.010" (NPS ≥ 1.5")
- ±12.5%
- Single random (18–22 ft) or cut to order
- SCH 5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, STD, XS, XXS
- 1/8" – 40"
- ±0.008" (NPS < 1.5") / ±0.010" (NPS ≥ 1.5")
- +20% / −0%
- Single random or cut to order
- SCH 5, 10, 40, 80, STD
| Nominal Size | OD | Wall Thickness, SCHEDULE | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NPS | DN | mm | 5S | 10S | 10 | 20 | 30 | 40S | STD | 40 | 80S | XS | 80 | 100 | 120 | 140 | 160 | XXS | |
| 1∕8" | 6 | 10.3 | 1.24 | 1.73 | 1.73 | 1.73 | 2.41 | 2.41 | 2.41 | ||||||||||
| 1∕4" | 8 | 13.7 | 1.65 | 2.24 | 2.24 | 2.24 | 3.02 | 3.02 | 3.02 | ||||||||||
| 3∕8" | 10 | 17.2 | 1.65 | 2.31 | 2.31 | 231 | 3.2 | 3.2 | 3.2 | ||||||||||
| 1∕2" | 15 | 21.3 | 1.65 | 2.11 | 2.77 | 2.77 | 2.77 | 3.73 | 3.73 | 3.73 | 4.78 | 7.47 | |||||||
| 3∕4" | 20 | 26.7 | 1.65 | 2.11 | 2.87 | 2.87 | 2.87 | 3.91 | 3.91 | 3.91 | 5.56 | 7.82 | |||||||
| 1" | 25 | 33.4 | 1.65 | 2.77 | 3.38 | 3.38 | 3.38 | 4.55 | 4.55 | 4.55 | 6.35 | 9.09 | |||||||
| 1-1∕4" | 32 | 42.2 | 1.65 | 2.77 | 3.56 | 3.56 | 3,56 | 4.85 | 4.85 | 4.85 | 6.35 | 9.7 | |||||||
| 1-1∕2" | 40 | 48.3 | 1.65 | 2.77 | 3.68 | 3.68 | 3.68 | 5.08 | 5.08 | 5.08 | 7.14 | 10.15 | |||||||
| 2" | 50 | 60.3 | 1.65 | 2.77 | 3.91 | 3.91 | 3.91 | 5.54 | 5.54 | 5.54 | 8.74 | 11.07 | |||||||
| 2-1∕2" | 65 | 73 | 2.11 | 3.05 | 5.16 | 5.16 | 5.16 | 7.01 | 7.01 | 7.01 | 9.53 | 14.02 | |||||||
| 3" | 80 | 88.9 | 2.11 | 3.05 | 5.49 | 5.49 | 5.49 | 7.62 | 7.62 | 7.62 | 11.13 | 15.24 | |||||||
| 3-1∕2" | 90 | 101.6 | 2.11 | 3.05 | 5.74 | 5.74 | 5.74 | 8.08 | 8.08 | 8.08 | |||||||||
| 4" | 100 | 114.3 | 2.11 | 3.05 | 6.02 | 6.02 | 6.02 | 8.56 | 8.56 | 8.54 | 11.13 | 13.49 | 17.12 | ||||||
| 5" | 125 | 141.3 | 2.77 | 3.4 | 6.55 | 6.55 | 6.55 | 9.53 | 9,53 | 9.53 | 12.7 | 15.88 | 19.05 | ||||||
| 6" | 150 | 168.3 | 2.77 | 3.4 | 7.11 | 7.11 | 7.11 | 10.97 | 10.97 | 10.97 | 14.27 | 18.26 | 21.95 | ||||||
| 8" | 200 | 219.1 | 2.77 | 3.76 | 6.35 | 7.04 | 8.18 | 8.18 | 8.18 | 12.7 | 12.7 | 12.7 | 15.09 | 18.26 | 20.62 | 23.01 | 22.23 | ||
| 10" | 250 | 273.1 | 3.4 | 4.19 | 6.35 | 7.8 | 9.27 | 9.27 | 9.27 | 12.7 | 12.7 | 15.09 | 18.26 | 21.44 | 25.4 | 28.58 | 25.4 | ||
| 12" | 300 | 323.9 | 3.96 | 4.57 | 6.35 | 8.38 | 9.53 | 9.53 | 10.31 | 12.7 | 12.7 | 17.48 | 21.44 | 25.4 | 28.58 | 33.32 | 25.4 | ||
| 14" | 350 | 355.6 | 3.96 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 11.13 | 12.7 | 19.05 | 23.83 | 27.79 | 31.75 | 35.71 | ||||
| 16" | 400 | 406.4 | 4.19 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 12.7 | 12.7 | 21.44 | 26.19 | 30.95 | 36.53 | 40.49 | ||||
| 18" | 450 | 457.2 | 4.19 | 4.78 | 6.35 | 7.92 | 11.13 | 9.53 | 14.27 | 12.7 | 23.83 | 29.36 | 34.93 | 39,67 | 45.24 | ||||
| 20" | 500 | 508 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | 9.53 | 15.09 | 12.7 | 26.19 | 32.54 | 38.1 | 44.45 | 50.01 | ||||
| 22" | 550 | 558.8 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | 9.53 | 12.7 | 28.58 | 34.93 | 41.28 | 47.63 | 53.98 | |||||
| 24" | 600 | 609.6 | 5.54 | 6.35 | 6.35 | 9.53 | 14.27 | 9.53 | 17.48 | 12.7 | 30.96 | 38.89 | 46.02 | 52.37 | 59.54 | ||||
| 26" | 650 | 660.4 | 7.92 | 12.7 | 9.53 | 12.7 | |||||||||||||
| 28" | 700 | 711.2 | 7.92 | 12.7 | 15.88 | 9.53 | 12.7 | ||||||||||||
| 30" | 750 | 762 | 6.35 | 7.92 | 7.92 | 12.7 | 15.88 | 9.53 | 12.7 | ||||||||||
| 32" | 800 | 812.8 | 7.92 | 12.7 | 15.88 | 17.48 | 9.53 | 17.48 | 12.7 | ||||||||||
| 34" | 850 | 863.6 | 7.92 | 12.7 | 15.88 | 17.48 | 9.53 | 17.48 | 12.7 | ||||||||||
| 36" | 900 | 914.4 | 7.92 | 12.7 | 15.88 | 19.05 | 9.53 | 19.05 | 12.7 | ||||||||||
| 38" | 950 | 965.2 | - | 9.53 | 12.7 | ||||||||||||||
| 40" | 1000 | 1016 | - | 9.53 | 12.7 | ||||||||||||||
Available Grades for Every Application
Select from our comprehensive range of austenitic stainless steel grades, each optimized for specific service conditions.
TP304
General Purpose
The most widely used austenitic stainless steel. Excellent corrosion resistance in atmospheric and general chemical environments. Suitable for food processing, architectural, and industrial applications.
- 18Cr-8Ni
- Good Weldability
- Corrosion Resistant
TP304L
Low Carbon
Low carbon variant of 304 for enhanced resistance to intergranular corrosion after welding. Ideal for heavy-gauge welded components where post-weld heat treatment is not feasible.
- 18Cr-8Ni
- Max C: 0.030%
- Weld-Ready
TP316
Marine / Chemical Grade
Molybdenum addition provides superior pitting and crevice corrosion resistance in chloride environments. The standard for marine, chemical processing, and pharmaceutical applications.
- 16Cr-10Ni-2Mo
- Chloride Resistant
- High Strength
TP316L
Low Carbon / Marine
Combines the corrosion resistance of 316 with the weldability benefits of low carbon content. Preferred for welded structures in aggressive chloride and acidic environments.
- 16Cr-10Ni-2Mo
- Max C: 0.030%
- Anti-Sensitization
TP321
Stabilized Grade
Titanium-stabilized to prevent chromium carbide precipitation at grain boundaries. Designed for prolonged service in the 800–1500°F (427–816°C) temperature range.
- Ti-Stabilized
- High Temp
- Anti-Sensitization
TP347
Niobium Stabilized
Columbium/niobium-stabilized for high-temperature applications. Excellent resistance to intergranular corrosion. Used in high-temperature chemical and aerospace applications.
- Cb-Stabilized
- High Temp
- Creep Resistant
Proven Performance Across Critical Industries
From deep-sea subsea systems to high-temperature process lines, our ASTM A312 pipe delivers reliable service in the most demanding environments.
Oil & Gas
Process piping, flowlines, and transmission systems for upstream, midstream, and downstream operations. Resistant to H2S, CO2, and chloride environments.
Chemical & Petrochemical
Reactor feed lines, heat exchanger tubing, and transfer piping for aggressive acid, alkali, and solvent service conditions.
Food & Beverage
FDA-compliant sanitary piping systems for dairy, brewing, juice processing, and pharmaceutical manufacturing. Easy to clean and sterilize.
Architecture & Structural
Handrails, cladding supports, curtain wall systems, and decorative piping. Superior aesthetic finish with lasting corrosion protection.
Power Generation
Superheater tubes, reheater elements, and feedwater systems. High-temperature creep resistance for fossil fuel and nuclear applications.
- Pulp & Paper
- Marine
- Pharmaceutical
- Water Treatment
Uncompromising Quality at Every Stage
From raw material sourcing to final delivery, our integrated quality management system ensures every pipe meets or exceeds ASTM A312 requirements.
Raw Material Verification
Positive Material Identification (PMI) testing on every heat of steel. Full chemical analysis by optical emission spectrometry before production begins.
In-Process Control
Continuous dimensional monitoring during forming and welding. 100% non-destructive electric testing (eddy current or ultrasonic) per ASTM A312 requirements.
Final Testing & Documentation
Hydrostatic testing of every pipe. Mechanical testing including tensile, flattening, flaring, and intergranular corrosion tests. Full EN 10204 3.1 certificates with every shipment.
Certifications & Approvals
ISO 9001:2015, ISO 14001:2015, PED 2014/68/EU, AD 2000-W0, and ASME certified. Third-party inspections by SGS, Bureau Veritas, and Lloyds Register.
