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. Specify the grade, manufacturing route, dimensions, schedule, length, heat treatment, testing, quantity, and documentation required by the project. Compare ASTM A358 pipe and ASTM A778 welded pipe, or review the industrial pipe range.
Manufactured for Critical Infrastructure
ASTM A312 includes seamless (SMLS), welded (WLD), and heavily cold-worked (HCW) manufacturing routes. The applicable requirements depend on the selected grade, pipe size, manufacturing route, heat treatment, and project specification.
The purchase order should clearly state the required tests, examination method, acceptance criteria, certification, and any supplementary requirements. Include the operating conditions and applicable piping code when requesting technical review or quotation.
- 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
Mechanical minima shown for TP304L and TP316L must not be used for TP304 or TP316; select the grade-specific requirements in the ASTM A312/A312M edition stated in the purchase specification. Confirm the required material test report and any supplementary inspection or documentation when ordering.
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
- TP304L
- TP316L
- 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
Stainless steel piping for dairy, brewing, juice and other food-processing systems. Grade, surface finish, cleaning procedure and food-contact suitability must be verified for the intended service and applicable requirements.
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
Quality requirements should be defined by the applicable ASTM A312 edition, the manufacturing route, the project piping code, and the agreed inspection and documentation plan.
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
Dimensional checks during forming and welding. ASTM A312 requires each pipe to receive a nondestructive electric test or a hydrostatic test, as specified by the applicable standard edition and purchase order.
Final Testing & Documentation
Final inspection includes the test method required by the applicable ASTM A312 edition and purchase order: nondestructive electric testing or hydrostatic testing for each pipe. Mechanical and supplementary tests, plus EN 10204 3.1 documentation, are supplied when specified and confirmed for the order.
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.