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Heavy wall stainless steel pipe is designed for demanding piping systems that require higher wall thickness, stronger pressure resistance and long-term corrosion performance. Compared with standard wall stainless steel pipe, heavy wall pipe is commonly used in high-pressure pipelines, chemical processing systems, petrochemical plants, power generation equipment, offshore platforms, marine engineering, heat exchangers and heavy mechanical structures.
Xi'an Dongmeng Group Co., Ltd. supplies ASTM A312 / ASME SA312 heavy wall stainless steel pipe in TP304, TP304L, TP316, TP316L, 321, 347, 310S and duplex stainless steel grades. Products can be supplied in seamless, welded, EFW and custom heavy wall forms, with wall thickness options including SCH 80, SCH 120, SCH 160, XS and XXS. Pipe schedules are used to define wall thickness for the same nominal pipe size, and stainless steel pipe commonly follows ASME B36.19M dimensional practice.
Heavy wall stainless steel pipe overview
Heavy wall stainless steel pipe is a high-strength stainless steel piping product with increased wall thickness for pressure, load-bearing, wear resistance and severe service environments. It is often selected when ordinary stainless steel pipe cannot meet the project requirements for pressure rating, mechanical strength, erosion resistance or long service life.
For industrial procurement, "heavy wall stainless steel pipe" may also be searched as thick wall stainless steel pipe, heavy wall stainless steel tube, SCH 160 stainless steel pipe, XXS stainless steel pipe or large diameter heavy wall stainless steel pipe. In many engineering projects, buyers select pipe based on grade, outside diameter, schedule, wall thickness, length, pipe end type, inspection standard and certificate requirement.
Our heavy wall stainless steel pipes can be supplied for both general corrosive service and high-temperature service, especially when specified under ASTM A312 / ASME SA312. ASTM A312 is a widely used standard for austenitic stainless steel pipe including seamless, welded and heavily cold worked welded pipe.
Core Advantages
Higher Wall Thickness for Pressure Service
Heavy wall stainless steel pipe provides stronger resistance to internal pressure, external load and mechanical stress compared with standard wall pipe.
Excellent Corrosion Resistance
304 / 304L grades are suitable for general industrial corrosion environments, while 316 / 316L grades provide better performance in chloride-containing, chemical and marine environments.
Suitable for High-temperature Applications
Grades such as 304H, 316H, 321, 347 and 310S can be selected for elevated temperature and thermal cycling conditions.
Seamless and Welded Options
Seamless heavy wall pipe is preferred for high-pressure and critical service. Welded or EFW heavy wall pipe can be a cost-effective solution for large diameter applications.
Custom Processing for Projects
Cut-to-length, beveling, threading, polishing, passivation, marking, packing and third-party inspection can be arranged according to project requirements.
Specification Table
| Item | Available Range |
|---|---|
| Product | Heavy Wall Stainless Steel Pipe / Thick Wall Stainless Steel Pipe |
| Standard | ASTM A312, ASME SA312, ASTM A358, ASTM A376, ASME B36.19M |
| Grades | TP304, TP304L, TP316, TP316L, 321, 347, 310S, 904L, 2205, 2507 |
| Type | Seamless, Welded, EFW, Heavily Cold Worked |
| Size Range | 1/8"–48", larger sizes customized |
| Outside Diameter | 10.3 mm–1219 mm, customized |
| Wall Thickness | SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, XS, XXS, custom heavy wall |
| Length | 5.8 m, 6 m, 11.8 m, 12 m, SRL, DRL, custom cut length |
| Surface | Pickled, annealed, polished, passivated, black surface available for some processes |
| Ends | Plain end, beveled end, threaded end, capped end |
| Inspection | PMI, UT, RT, hydrostatic test, tensile test, flattening test |
| Certificate | EN 10204 3.1 / 3.2, MTC, third-party inspection |
| Packing | Bundles, wooden cases, steel frames, waterproof wrapping, seaworthy packing |
Common Wall Thickness Options
| Pipe Schedule | Description | Typical Application |
|---|---|---|
| SCH 40S / SCH 40 | Medium wall thickness | General industrial piping |
| SCH 80S / SCH 80 | Heavy-duty piping | Higher pressure water, chemical and process lines |
| SCH 120 | Extra heavy wall | High-pressure and structural applications |
| SCH 160 | Very heavy wall | Severe pressure and heavy industrial service |
| XS | Extra Strong | Pressure piping and mechanical use |
| XXS | Double Extra Strong | Critical pressure, machining and heavy-duty systems |
Heavy Wall Stainless Steel Pipe Size Range
| NPS | OD mm | Common Heavy Wall Options |
|---|---|---|
| 1/2" | 21.3 | SCH 80, SCH 160, XXS |
| 3/4" | 26.7 | SCH 80, SCH 160, XXS |
| 1" | 33.4 | SCH 80, SCH 160, XXS |
| 1-1/2" | 48.3 | SCH 80, SCH 160, XXS |
| 2" | 60.3 | SCH 80, SCH 160, XXS |
| 3" | 88.9 | SCH 80, SCH 120, SCH 160, XXS |
| 4" | 114.3 | SCH 80, SCH 120, SCH 160, XXS |
| 6" | 168.3 | SCH 80, SCH 120, SCH 160 |
| 8" | 219.1 | SCH 80, SCH 120, SCH 160 |
| 10" | 273.1 | SCH 80, SCH 120, SCH 160 |
| 12" | 323.9 | SCH 80, SCH 120, SCH 160 |
| 16" | 406.4 | SCH 80, SCH 120, SCH 160, custom |
| 20" | 508.0 | SCH 80, SCH 120, custom heavy wall |
| 24" | 609.6 | SCH 80, SCH 120, custom heavy wall |
Material Grades
304 / 304L Heavy Wall Stainless Steel Pipe
304 heavy wall stainless steel pipe is widely used for general industrial piping, water treatment, mechanical structures and building systems. 304L has lower carbon content and is more suitable for welded systems where intergranular corrosion resistance is required.
316 / 316L Heavy Wall Stainless Steel Pipe
316 / 316L heavy wall stainless steel pipe contains molybdenum, offering better resistance to chloride corrosion and chemical media. It is widely used in marine, chemical processing, coastal engineering and pharmaceutical equipment.
321 Heavy Wall Stainless Steel Pipe
321 stainless steel contains titanium stabilization and is suitable for high-temperature applications where resistance to intergranular corrosion after heating is required.
347 Heavy Wall Stainless Steel Pipe
347 stainless steel is niobium-stabilized and suitable for elevated-temperature service, refinery systems, heat exchangers and high-temperature piping.
310S Heavy Wall Stainless Steel Pipe
310S stainless steel offers excellent oxidation resistance and is commonly used in furnace parts, thermal equipment, heat treatment systems and high-temperature industrial piping.
Duplex 2205 / 2507 Heavy Wall Stainless Steel Pipe
Duplex stainless steel heavy wall pipe provides high strength and excellent resistance to chloride stress corrosion cracking. It is used in offshore, desalination, chemical and high-strength piping systems.
Chemical Composition
| Grade | C max | Mn max | P max | S max | Si max | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| TP304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–11.0 | - | - |
| TP304L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–13.0 | - | - |
| TP316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0–18.0 | 11.0–14.0 | 2.0–3.0 | - |
| TP316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | - |
| TP321 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–19.0 | 9.0–12.0 | - | Ti stabilized |
| TP347 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–20.0 | 9.0–13.0 | - | Nb stabilized |
| 310S | 0.08 | 2.00 | 0.045 | 0.030 | 1.50 | 24.0–26.0 | 19.0–22.0 | - | High Cr-Ni |
Mechanical Properties
| Grade | Tensile Strength min | Yield Strength min | Elongation min |
|---|---|---|---|
| TP304 | 515 MPa | 205 MPa | 35% |
| TP304L | 485 MPa | 170 MPa | 35% |
| TP316 | 515 MPa | 205 MPa | 35% |
| TP316L | 485 MPa | 170 MPa | 35% |
| TP321 | 515 MPa | 205 MPa | 35% |
| TP347 | 515 MPa | 205 MPa | 35% |
| 310S | 515 MPa | 205 MPa | 35% |
Physical Properties
| Property | Typical Austenitic Stainless Steel Value |
|---|---|
| Density | Approx. 7.9–8.0 g/cm³ |
| Elastic Modulus | Approx. 193 GPa |
| Thermal Conductivity | Approx. 14–16 W/m·K |
| Thermal Expansion | Approx. 16–17 × 10⁻⁶ /K |
| Electrical Resistivity | Higher than carbon steel |
| Magnetic Property | Generally non-magnetic in annealed condition, may become slightly magnetic after cold working |
Processing Performance Analysis
Heavy wall stainless steel pipe has higher wall thickness and stronger section rigidity, so processing requires more controlled cutting, beveling and machining conditions than thin wall or standard wall pipe.
For heavy wall pipe, the main processing points include:
Use stable cutting speed to avoid overheating.
Apply proper coolant during machining.
Control bevel angle and root face for welding preparation.
Avoid deep surface scratches during handling.
Maintain pipe roundness and straightness during cutting.
Use suitable tools for 316L, duplex and high-temperature grades.
For project orders, beveling and fixed-length cutting should be confirmed before shipment to reduce fabrication time at the jobsite.
Welding Performance Analysis
Austenitic stainless steel heavy wall pipe generally has good weldability, but thicker walls require better control of heat input, interpass temperature and joint preparation.
Key welding recommendations:
Use 304L or 316L for welded systems when low carbon performance is required.
Use matching filler materials according to grade.
Apply proper bevel preparation for heavy wall pipe.
Control heat input to reduce distortion and sensitization risk.
Perform pickling and passivation after welding where required.
For critical service, RT / UT / PT inspection can be arranged.
For thick wall stainless steel pipe, welding quality is especially important because incomplete penetration, lack of fusion and excessive heat input may reduce service reliability.
Corrosion Resistance Analysis
Heavy wall stainless steel pipe offers long service life in corrosive industrial environments. However, corrosion resistance depends strongly on grade selection, medium, temperature, chloride content and surface condition.
| Environment | Recommended Grade |
|---|---|
| General water and mild industrial service | 304 / 304L |
| Chloride-containing water | 316 / 316L |
| Marine and coastal systems | 316L / 2205 / 2507 |
| High-temperature oxidation | 310S / 321 / 347 |
| Chemical processing | 316L / 904L / duplex grades |
| Desalination and offshore | 2205 / 2507 |
316L is usually preferred over 304 in chloride-containing or marine environments because molybdenum improves resistance to localized corrosion.
Applications
Oil & Gas Industry
Used for process pipelines, pressure lines, utility systems, offshore equipment, refinery piping and mechanical components.
Chemical Processing
Suitable for corrosive fluid transfer, acid-resistant pipelines, reactors, pressure vessels and chemical plant systems.
Power Plant
Used in high-temperature pipelines, boiler auxiliary systems, heat exchangers, steam-related equipment and cooling water systems.
Marine Engineering
316L, duplex 2205 and 2507 heavy wall pipes are used in seawater systems, offshore platforms, shipbuilding and coastal facilities.
Heat Exchanger and Pressure Equipment
Heavy wall stainless steel pipe is used for high-strength tubular parts, pressure equipment components and thick wall machined parts.
Heavy Machinery
Used for hydraulic cylinder parts, mechanical sleeves, structural supports, rotating equipment and high-load industrial components.
Heavy Wall Stainless Steel Pipe vs Standard Wall Pipe
| Item | Standard Wall Stainless Pipe | Heavy Wall Stainless Pipe |
|---|---|---|
| Wall Thickness | Lower to medium | Higher |
| Weight | Lighter | Heavier |
| Pressure Resistance | General service | Higher pressure service |
| Machining Allowance | Limited | Better for machining |
| Cost | Lower | Higher |
| Applications | General piping | Pressure, chemical, power, offshore, heavy equipment |
| Common Schedules | SCH 10S, SCH 40S | SCH 80, SCH 120, SCH 160, XS, XXS |
Seamless vs Welded Heavy Wall Stainless Steel Pipe
| Item | Seamless Heavy Wall Pipe | Welded Heavy Wall Pipe |
|---|---|---|
| Manufacturing | Piercing, hot working, cold working | Plate / coil forming and welding |
| Pressure Suitability | Better for critical high-pressure service | Suitable for large diameter and project piping |
| Size Range | Limited by manufacturing capability | More flexible for large OD |
| Cost | Usually higher | Usually more economical for large sizes |
| Typical Use | Pressure piping, high-temperature, critical service | Large diameter piping, structural and project systems |
Inspection & Quality Assurance
Xi'an Dongmeng Group Co., Ltd. provides strict inspection for heavy wall stainless steel pipe before shipment.
| Inspection Item | Description |
|---|---|
| Raw Material Inspection | Heat number, grade, standard and chemical composition verification |
| Dimension Inspection | OD, wall thickness, length, ovality and straightness |
| Wall Thickness Check | Ultrasonic or manual thickness measurement |
| Surface Inspection | Cracks, scratches, dents, pits and pickling quality |
| PMI Test | Grade confirmation for 304, 316L, 321, 347, duplex grades |
| Mechanical Test | Tensile strength, yield strength and elongation |
| Hydrostatic Test | Pressure test according to order requirement |
| Ultrasonic Test | Internal defect detection for critical service |
| Radiographic Test | Available for welded heavy wall pipe |
| MTC | EN 10204 3.1 / 3.2 available |
| Third-party Inspection | SGS, BV, TUV, Lloyd's or customer-appointed inspection accepted |
ASTM A312 pipe tolerance pages commonly emphasize OD, wall thickness and length control, and heavy wall pipe buyers will pay special attention to wall thickness tolerance, ovality and fixed-length accuracy.
Packaging & Shipping
Plastic caps on both ends
Pipe bundled with steel strips
Waterproof wrapping
Wooden cases for small OD or precision pipe
Steel frames for heavy wall and large diameter pipe
Anti-collision protection for beveled ends
Clear label with grade, size, heat number and standard
Export seaworthy packing
Container loading photos available
Shipping by sea, railway or air freight according to order volume
Why Choose Xi'an Dongmeng Group Co., Ltd.
Heavy Wall Pipe Supply Capability
SCH 80, SCH 120, SCH 160, XS, XXS and customized wall thickness available.
Multiple Stainless Steel Grades
304, 304L, 316, 316L, 321, 347, 310S, 904L, duplex 2205 and 2507 can be supplied.
Seamless and Welded Options
Suitable solutions can be recommended according to pressure level, diameter, wall thickness and project budget.
Project Processing Service
Cutting, beveling, threading, polishing, passivation and marking can be arranged.
Strict Quality Control
PMI, UT, RT, hydrostatic test, MTC 3.1 and third-party inspection are available.
Export Experience
Seaworthy packing, container loading support and global delivery for industrial projects.
FAQ
1. What is heavy wall stainless steel pipe?
Heavy wall stainless steel pipe is stainless steel pipe with increased wall thickness for higher pressure, stronger mechanical strength and severe industrial service.
2. What is the difference between heavy wall pipe and thick wall pipe?
They are often used as similar terms. "Heavy wall" is more common in industrial pipe procurement, while "thick wall" is also widely used by buyers searching for high wall thickness pipe.
3. Which stainless steel grades are available?
Common grades include TP304, TP304L, TP316, TP316L, 321, 347 and 310S. Duplex 2205, 2507 and other special grades can also be supplied.
4. Can you supply SCH 160 stainless steel pipe?
Yes. SCH 160 stainless steel pipe and other heavy wall schedules such as SCH 80, SCH 120, XS and XXS can be supplied according to size and grade.
5. Is heavy wall stainless steel pipe available in seamless type?
Yes. Seamless heavy wall stainless steel pipe is available for many sizes and is suitable for high-pressure and critical service applications.
6. Can you supply large diameter heavy wall stainless steel pipe?
Yes. Large diameter welded or EFW heavy wall stainless steel pipe can be supplied according to project requirements.
7. Which is better for heavy wall pipe, 304 or 316L?
304 is suitable for general industrial environments. 316L is better for marine, chloride-containing and chemical environments.
8. Can you provide beveled ends?
Yes. Plain ends, beveled ends and threaded ends can be supplied according to welding and installation requirements.
9. Can you provide MTC 3.1?
Yes. EN 10204 3.1 material test certificate can be supplied with shipment. Third-party inspection is also available.
10. What information should I provide for quotation?
Please provide grade, standard, outside diameter, wall thickness or schedule, length, quantity, pipe type, end type, destination port and inspection requirements.
Contact Us
Xi'an Dongmeng Group Co., Ltd.
Phone / WhatsApp / WeChat: +8615769214734
Email: office@dongmjd.com
Looking for heavy wall stainless steel pipe price, wall thickness chart or MTC sample? Contact us today for a fast quotation.
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