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- SS SMLS PIPE TP304 ASTM A312
ASTM A269/A270/A213 TP304 Stainless Steel Seamless Tubes from China Suppliers | ZONSUN Steel Factory
Introduction
A standard austenitic stainless steel under ASTM A269, widely used for seamless and welded tubing in general corrosion-resistant applications. It contains 18–20% Cr and 8–11% Ni, offering balanced mechanical properties and formability.
Key Features
Corrosion Resistance
Resists oxidation and organic acids but may suffer from intergranular corrosion in welded areas due to carbide precipitation.
High-Temperature Stability
Maintains strength up to 870°C, suitable for moderate heat environments.
Applications
Fluid/gas transfer, heat exchangers, and industrial piping systems.
Why Choose TP304 Stainless Steel Tube?
Superior Corrosion Resistance: TP304 resists oxidation, organic acids, and mild corrosive environments, making it ideal for applications exposed to moisture, chemicals, or saline atmospheres. Its chromium content forms a passive oxide layer that self-repairs when damaged.
High-Temperature Stability: Withstanding temperatures up to 870°C (1600°F) intermittently, TP304 is suitable for heat exchangers, exhaust systems, and industrial furnaces.
Mechanical Strength and Ductility: The alloy maintains excellent tensile strength and elongation even at cryogenic temperatures, ensuring reliability under mechanical stress or thermal cycling.
Ease of Fabrication: TP304’s outstanding formability and weldability (via TIG, MIG, or laser welding) allow for seamless integration into complex designs without sacrificing performance.
Hygienic and Aesthetic Appeal: Its smooth surface inhibits bacterial growth, critical for food, pharmaceutical, and medical industries. Additionally, its polished finish is visually appealing for architectural uses.
Cost-Effectiveness: Compared to higher-grade alloys like TP316, TP304 offers a budget-friendly solution for applications where extreme chloride resistance is not required.
Compliance with Standards: TP304 tube meets international specifications (e.g., ASTM A269, A213) and is NSF-certified for potable water systems, ensuring quality and safety.
Material Specification
Standard
ASTM A269 & A270 & A213
O.D
1/8" NB TO 32" NB, (10.29MM-812.80MM), (Customization Available)
W.T
SCH 10S, SCH 40S, SCH 80S, SCH160, SCH XXS (Customization Available)
Application
- Heat Exchangers and Boilers
- Food and Beverage Processing
- Petrochemical and Energy Sectors
- Architectural and Decorative Uses
- Food & Dairy Plants
- Pharmaceutical Plant
End
Plain End, Beveled End, Threaded
Processing
Cut-to-length; Polishing.
Inspection
- 100% PMI TESTED
- EN10204.3.1B MILL TEST CERTIFICATE
- THIRD PARTY INSPECTION ACCEPTED
Delivery Condition
Cold Drawn, Annealed and Pickled / Polished / Bright Annealed / Sand blasting / Shot Blasting.
Marking
All SS SMLS Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or as per the customer’s request)
Packing
Packed in Wooden Boxes, plywood cases, Steel Strips Bundled, or as per Customers Requests
Specials
Sizes and Specifications other than above can be customized on request.
Specification Parameters
A269/270/213 TP304 Chemical Composition
| HEAT NO. | CHEMICAL COMPOSITION (%) | |||||||
|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Ni | Cr | ||
| STAND. | MIN. | - | - | - | - | - | 8.00 | 18.00 |
| MAX. | 0.080 | 2.00 | 0.045 | 0.030 | 1.00 | 11.00 | 20.00 | |
A269/270/213 TP304 Mechanical Properties
| Mechanical Properties | |||||
|---|---|---|---|---|---|
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness MAX | |
| Rockwell (HRB) | Brinell (HBW) | ||||
| ASTM A269 TP304 | - | - | - | 90 | 192 |
| ASTM A213 TP304 | 515 | 205 | 35 | 90 | 192 |
| ASTM A270 TP304 | 515 | 205 | 35 | B90 | - |
Equivalent Grades - (ASTM A269&A270&A213 TP304 Equivalent Grades)
| ASTM A269/270/213 TP304 Equivalent Grades | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| USA (ASTM / AISI) | Germany (DIN, WNr) | Japan (JIS) | France (AFNOR) | England (BS) | Euronorms (EN) | Italy (UNI) | Spain (UNE) | China (GB) | Sweden (SS) | Poland (PN) | Czech Republic (CSN) | Austria (ONORM) |
| 304 304H S30400 |
1.4301 1.5301 X5CrNi18-10 X5CrNi18-9 X6CrNi18-9 |
SUS304 | 304F00 X5CN18-10 Z4CN19-10FF Z5CN17-08 Z6CN18-09 Z7CN18-09 |
304S11 304S15 304S16 304S16 304S17 304S18 304S25 304S31 |
1.4301 1.4948 X5CrNi18-10 X6CrNi18-10 |
X3CrNi18-10 X5CrNi18-10 |
F.3504 F3551 X5CrNi18-10 |
0Cr19Ni9 0Cr18Ni9 |
2332 2333 |
0H18N9 | 17240 | X5CrNi18-10OS |
ASTM A269/A269M & ASTM A270/A270M Standard Cold Machining Size Deviation Permitted
| ASTM A269/A269M Standard cold machining size deviation permitted | ||||||
|---|---|---|---|---|---|---|
| Group | Size, Outside Diameter, in. [mm] | Permissible Variations in Outside Diameter, in. [mm] | Permissible Variations in Wall Thickness, % | Permissible Variations in Cut Length, in. [mm] | Thin Walled Tubes | |
| Over | Under | |||||
| 1 | Up to 1/2 [13] | ±0.005 [0.13] | ±15 | 1/8 [3.2] | 0 | ... |
| 2 | 1/2 to 1 1/2 [13 to 38], excl | ±0.005 [0.13] | ±10 | 1/8 [3.2] | 0 | less than 0.065 in. [1.65 mm] nominal |
| 3 | 1 1/2 to 3 1/2 [38 to 89], excl | ±0.010 [0.25] | ±10 | 3/16 [4.8] | 0 | less than 0.095 in. [2.41 mm] nominal |
| 4 | 3 1/2 to 5 1/2 [89 to 140], excl | ±0.015 [0.38] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 5 | 5 1/2 to 8 [140 to 203], excl | ±0.030 [0.76] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 6 | 8 to 12 [203 to 305], excl | ±0.040 [1.01] | ±10 | 3/16 [4.8] | 0 | less than 0.200 in. [5.08 mm] nominal |
| 7 | 12 to 14 [305 to 356], excl | ±0.050 [1.26] | ±10 | 3/16 [4.8] | 0 | less than 0.220 in. [5.59 mm] nominal |
| ASTM A270/A270M Standard cold machining size deviation permitted | ||||
|---|---|---|---|---|
| Size, Outside Diameter, in. [mm] | Permissible Variations in Outside Diameter, in. [mm] | Permissible Variations in Cut Length, in. [mm] | ||
| Over | Under | Over | Under | |
| 1.000 [25] and under | 0.005 [0.13] | 0.005 [0.13] | 1/8 [3] | 0 |
| Over 1 [25] to 2 [50] | 0.008 [0.20] | 0.008 [0.20] | 1/8 [3] | 0 |
| Over 2 [50] to 3 [75] | 0.010 [0.25] | 0.010 [0.25] | 1/8 [3] | 0 |
| Over 3 [75] to 4 [100] | 0.015 [0.38] | 0.015 [0.38] | 1/8 [3] | 0 |
| Over 4 [100] to 5 1/2 [140], excl | 0.015 [0.38] | 0.015 [0.38] | 3/16 [5] | 0 |
| 5 1/2 [140] to 8 [200], excl | 0.030 [0.75] | 0.030 [0.75] | 3/16 [5] | 0 |
| 8 [200] to 12 [300] | 0.050 [1.25] | 0.050 [1.25] | 3/16 [5] | 0 |
Frequently Asked Questions (FAQ)
What are the standard specifications for TP304 stainless steel tubes?
TP304 stainless steel tubes are manufactured in compliance with international standards including ASTM A269, ASTM A270, and ASTM A213, which cover seamless and welded tubing for general service, sanitary, and boiler/heat-exchanger applications.
What is the chemical composition of TP304 stainless steel?
TP304 is an austenitic stainless steel containing 18% to 20% Chromium (Cr) and 8% to 11% Nickel (Ni). It has a maximum carbon content of 0.080%, offering a balanced combination of corrosion resistance and formability.
What is the maximum temperature stability of TP304 tubes?
TP304 stainless steel tubes maintain their mechanical strength and resist oxidation at temperatures up to 870°C (1600°F) under intermittent service, making them highly suitable for heat exchangers and moderate-heat environments.
In which industries are TP304 stainless steel tubes commonly used?
Due to their hygienic surface and corrosion resistance, they are widely used in food and beverage processing, dairy plants, pharmaceutical plants, petrochemical sectors, energy systems, and architectural decorations.
What delivery conditions and finishes are available for these tubes?
Tubes can be supplied in various delivery conditions, including Cold Drawn, Annealed and Pickled, Polished, Bright Annealed, Sand Blasting, or Shot Blasting, depending on the specific application requirements.
How are TP304 tubes inspected to ensure quality?
Every tube undergoes rigorous quality control, including 100% PMI (Positive Material Identification) testing. They are delivered with an EN10204.3.1B Mill Test Certificate, and third-party inspections are fully accepted.