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ASTM A268 stainless steel pipe and tubing is a standardized specification for seamless and welded ferritic and martensitic stainless steel tubes designed for high-performance service in elevated temperature and moderately corrosive environments. Commonly manufactured in grades such as TP410, TP430, and related chromium-based alloys, ASTM A268 tubing delivers a strong balance of heat resistance, mechanical strength, and oxidation resistance, making it widely used in heat exchangers, boilers, condensers, and industrial process piping systems. As a cost-efficient alternative to austenitic stainless steels, ASTM A268 pipe provides stable long-term performance in thermal cycling conditions and is extensively adopted in power generation, petrochemical, and heavy industrial engineering projects worldwide, especially where durability, reliability, and export-grade compliance are required.
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What is ASTM A268 Stainless Steel Pipe?
ASTM A268 is a standard specification for seamless and welded ferritic and martensitic stainless steel tubing, mainly used for general corrosion-resistant and high-temperature applications.
This material family is widely known for:
Good oxidation resistance at elevated temperatures
Moderate corrosion resistance
High mechanical strength
Cost-effective alternative to austenitic stainless steels
ASTM A268 Material Overview
ASTM A268 covers stainless steel grades such as:
TP410
TP430
TP439
UNS S41500
These steels are typically chromium-based ferritic or martensitic stainless steels, which are magnetic and can be heat treated (depending on grade).
Standard Size Range – ASTM A268 Stainless Steel Tube
| Item | Metric Range | Imperial Range | Tolerance / Notes |
|---|---|---|---|
| Outer Diameter (OD) | 6 mm – 323.9 mm | 0.24 in – 12.75 in | According to ASTM A268 / ASME SA268 |
| Wall Thickness (WT) | 0.5 mm – 20.0 mm | 0.020 in – 0.787 in | Custom heavy-wall available for high pressure |
| Length | 1 m – 12 m | 3.28 ft – 39.37 ft | Fixed or random length as required |
| Seam Type | Seamless / Welded | Seamless / Welded | Seamless for high-pressure service |
| Straightness | ≤ 1.0 mm/m | ≤ 0.012 in/ft | Industrial standard control |
| Ovality (OD deviation) | ≤ 1% OD | ≤ 1% OD | High precision cold drawing process |
| End Finish | Plain / Beveled / Threaded | Plain / Beveled / Threaded | According to customer requirement |
| Surface Condition | Pickled / Annealed / Polished | Pickled / Annealed / Polished | Suitable for heat exchanger applications |
Special diameters (micro tube or heavy-duty pipe)
Tight tolerance precision tubing
U-bending heat exchanger tubes
Mirror polished or industrial pickled surface
Cut-to-length service
Application Fit (Size-Based Use Guide)
Small OD (6–25 mm): instrumentation, precision heat exchange
Medium OD (25–89 mm): boilers, condensers
Large OD (89–323 mm): industrial piping, heavy heat transfer systems
ASTM A268 Chemical Composition
| Grade | C (Carbon) | Cr (Chromium) | Mn (Manganese) | Si (Silicon) | P (Phosphorus) | S (Sulfur) | Ni (Nickel) | Other Elements |
|---|---|---|---|---|---|---|---|---|
| TP410 | ≤ 0.15% | 11.5 – 13.5% | ≤ 1.00% | ≤ 1.00% | ≤ 0.04% | ≤ 0.03% | ≤ 0.75% | Fe balance |
| TP430 | ≤ 0.12% | 16.0 – 18.0% | ≤ 1.00% | ≤ 1.00% | ≤ 0.04% | ≤ 0.03% | ≤ 0.75% | Fe balance |
| TP439 | ≤ 0.03% | 17.0 – 19.0% | ≤ 1.00% | ≤ 1.00% | ≤ 0.04% | ≤ 0.03% | ≤ 0.50% | Ti stabilized |
Mechanical Properties
ASTM A268 stainless steel tubes are designed for ferritic and martensitic stainless steels, offering a balance of strength, hardness, and temperature resistance depending on grade and heat treatment condition.
🔬 ASTM A268 Mechanical Properties
| Grade | Tensile Strength (MPa / ksi) | Yield Strength (MPa / ksi) | Elongation (%) | Hardness (HB / HRB) |
|---|---|---|---|---|
| TP410 (Annealed) | ≥ 480 MPa / 70 ksi | ≥ 275 MPa / 40 ksi | ≥ 20% | ≤ 201 HB |
| TP430 (Annealed) | ≥ 450 MPa / 65 ksi | ≥ 205 MPa / 30 ksi | ≥ 22% | ≤ 183 HB |
| TP439 (Annealed) | ≥ 415 MPa / 60 ksi | ≥ 205 MPa / 30 ksi | ≥ 22% | ≤ 180 HB |
Heat Treatment
Heat treatment is a critical process in ASTM A268 tubing production, directly influencing mechanical strength, corrosion resistance, and microstructure stability.
🏭 Standard Heat Treatment Conditions
✔ TP410 (Martensitic Grade)
Annealing Temperature: 815 – 900°C
Cooling Method: Air cooling / controlled furnace cooling
Purpose: Improve machinability and ductility before hardening
✔ TP430 / TP439 (Ferritic Grades)
Annealing Temperature: 750 – 850°C
Cooling Method: Air cooling (rapid cooling recommended)
Purpose: Relieve stress, stabilize ferritic structure
⚙️ Special Heat Treatment Options (Industrial Grade)
Bright annealing (BA surface)
Solution annealing for improved corrosion resistance
Stress-relief annealing for welded tubes
Controlled atmosphere furnace treatment (no oxidation surface)
Engineering Performance Data
🔥 High-Temperature Behavior
Continuous service temperature: up to 815°C (depending on grade)
Excellent oxidation resistance in intermittent heating environments
Suitable for boiler & heat exchanger applications
🧲 Magnetic Properties
TP410 → Magnetic (martensitic structure)
TP430 / TP439 → Magnetic (ferritic structure)
⚙️ Corrosion Resistance Performance
| Environment | Performance |
|---|---|
| Atmospheric exposure | Good |
| Fresh water | Good |
| Mild acids | Moderate |
| Chloride environment | Limited resistance |
🔩 Weldability
TP430 / TP439 → Good weldability with controlled heat input
TP410 → Requires preheating + post-weld heat treatment
Microstructure Characteristics
Ferritic structure → stable, low carbon diffusion
Martensitic structure → heat-treatable, high hardness potential
Chromium-rich matrix → oxidation resistance improvement
Titanium-stabilized TP439 → prevents carbide precipitation
Industry Engineering Standards Reference
ASTM A268 is widely recognized under:
ASTM International Standards
ASME SA268 Equivalent Specification
Heat exchanger tube engineering design codes
Petrochemical and power generation piping standards
Engineering Application Summary
ASTM A268 stainless steel tubing is engineered for:
Heat exchangers
Boiler systems
Condensers
Thermal fluid pipelines
Petrochemical processing equipment
Power plant auxiliary systems
Key Features of ASTM A268 Stainless Steel Tube
✔ High Temperature Resistance
Suitable for heat exchanger and boiler environments.
✔ Corrosion Resistance
Performs well in mild corrosive environments such as:
Water systems
Steam lines
Industrial heat transfer systems
✔ Strong Mechanical Properties
Includes good:
Tensile strength
Hardness control
Structural stability
✔ Seamless & Welded Options
Seamless tubes → high pressure & critical systems
Welded tubes → cost-efficient & large-scale applications
Manufacturing Process
ASTM A268 stainless steel tubes are manufactured through:
Steel billet selection
Hot forming / cold drawing
Seamless extrusion OR welding process
Heat treatment (if required)
Surface finishing (pickling / polishing)
Hydrostatic or NDT testing
Applications of ASTM A268 Stainless Steel Pipe
ASTM A268 tubing is widely used in:
Heat exchangers
Boilers & condensers
Petrochemical equipment
Industrial piping systems
Power generation systems
High-temperature fluid transfer
ASTM A268 vs Austenitic Stainless Steel (304/316)
| Property | ASTM A268 (Ferritic/Martensitic) | 304/316 Stainless |
|---|---|---|
| Cost | Lower | Higher |
| Corrosion Resistance | Moderate | Excellent |
| Magnetic | Yes | No |
| Heat Resistance | Good | Very good |
| Weldability | Medium | Excellent |
Inspection & Quality Assurance
Each ASTM A268 stainless steel tube is tested under strict QC systems:
Chemical composition analysis
Mechanical property testing
Hydrostatic pressure test
Eddy current / NDT inspection
Surface defect inspection
Dimensional accuracy check
Third-party inspection available upon request (SGS, BV, TUV).
Why Choose Us
Factory direct supply
Full ASTM / ASME compliance
Wide size range available
OEM & custom cutting service
Export experience to global markets
Stable quality with strict inspection system
Product Delivery Standards
Standard export seaworthy packaging
Wooden cases / steel strapped bundles
Anti-rust oil protection
Marking + heat number traceability
Fast global shipping support
ASTM A268 Stainless Steel Tube – FAQ
1. What is ASTM A268 stainless steel tubing used for?
ASTM A268 stainless steel tubing is mainly used in heat exchangers, boilers, condensers, and industrial piping systems. It is designed for applications requiring moderate corrosion resistance and high-temperature performance, especially in power generation, petrochemical, and thermal processing industries.
2. What materials are included in ASTM A268?
ASTM A268 covers ferritic and martensitic stainless steels, including common grades such as:
TP410
TP430
TP439
These materials are chromium-based stainless steels with different strength and corrosion resistance levels.
3. What is the difference between ASTM A268 and ASTM A312?
ASTM A268 → Ferritic / martensitic stainless steel tubes (magnetic, cost-effective, heat-resistant)
ASTM A312 → Austenitic stainless steel pipes (304/316, non-magnetic, higher corrosion resistance)
👉 A268 is preferred for heat exchanger and high-temperature service, while A312 is used for general corrosive fluid transport.
4. Is ASTM A268 tubing seamless or welded?
ASTM A268 includes both:
Seamless tubes → better for high pressure and critical systems
Welded tubes → more cost-effective for large-scale industrial applications
Both types are widely accepted depending on engineering requirements.
5. What is the maximum temperature resistance of ASTM A268?
ASTM A268 stainless steel tubes can typically perform in continuous service temperatures up to approximately 815°C, depending on the specific grade and operating environment.
6. Is ASTM A268 stainless steel magnetic?
Yes. Most ASTM A268 grades (such as TP410, TP430, TP439) are magnetic because they belong to ferritic or martensitic stainless steel families.
7. What industries use ASTM A268 stainless steel tubes?
It is widely used in:
Power plants
Heat exchanger manufacturing
Petrochemical plants
Boiler systems
Industrial fluid transfer systems
Thermal processing equipment
8. What surface finishes are available?
Common surface finishes include:
Pickled
Annealed
Polished
Bright annealed (BA)
Surface treatment depends on application requirements.
9. Can ASTM A268 tubes be customized?
Yes. Custom options include:
Different diameters and wall thickness
Fixed or random lengths
U-bending for heat exchangers
Special surface finishing
OEM marking and packaging
10. How is ASTM A268 quality ensured?
Quality control typically includes:
Chemical composition testing
Mechanical property testing
Hydrostatic pressure testing
Non-destructive testing (Eddy Current / UT)
Dimensional inspection
Third-party inspection (SGS, BV, TUV) available
11. What is the main advantage of ASTM A268 over 304 stainless steel?
ASTM A268 offers:
Lower cost
Better high-temperature oxidation resistance (in specific grades)
Suitable for heat exchange systems
However, 304 stainless steel provides better general corrosion resistance.
12. Can ASTM A268 tubing be exported globally?
Yes. ASTM A268 stainless steel tubes are widely exported and comply with international ASTM/ASME standards, making them suitable for global engineering and industrial projects.
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