Leading ASTM A269 TP304L, TP316L Stainless Steel Tubes Supplier in China
ASTM A269 specifies seamless and welded stainless steel tubing intended for general corrosion resistance, as well as low or high-temperature service. This standard covers various nominal wall thicknesses and grades commonly used in industrial applications.
- Standard Name: ASTM A269
- Applicable Grades: TP304, TP304L, TP316, TP316L, TP321, TP347, TP410, TP430
- Size: 1/4 inch (6.4 mm) inside diameter and larger
- Schedule: Schedule 5, 10, 40, or other custom schedules as applicable
- Wall Thickness: 0.020 inch (0.51 mm) and heavier
- Shape: Round, square, or rectangular
- Length: Random lengths, fixed lengths, or custom lengths as required
Chemical composition
| Grade | UNS Design | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | Ni (%) | Mo (%) | N (%) | Other Elements (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TP304 | S30400 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 18.0–20.0 | 8.0–11.0 | - | - | - |
| TP304L | S30403 | ≤0.035 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 18.0–20.0 | 8.0–13.0 | - | - | - |
| TP304LN | S30453 | ≤0.035 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 18.0–20.0 | 8.0–11.0 | - | 0.10–0.16 | - |
| TP316 | S31600 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 16.0–18.0 | 10.0–14.0 | 2.00–3.00 | - | - |
| TP316L | S31603 | ≤0.035 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 16.0–18.0 | 10.0–15.0 | 2.00–3.00 | - | - |
| TP316LN | S31653 | ≤0.035 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 16.0–18.0 | 10.0–13.0 | - | 0.10–0.16 | - |
| TP317 | S31700 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 18.0–20.0 | 11.0–15.0 | 3.00–4.00 | - | - |
| TP321 | S32100 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 17.0–19.0 | 9.0–12.0 | - | - | - |
| TP347 | S34700 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 17.0–19.0 | 9.0–13.0 | - | - | - |
| TP348 | S34800 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 17.0–19.0 | 9.0–12.0 | - | 0.10 | C: 0.20 max |
| S31254 | S31254 | ≤0.020 | ≤2.00 | ≤0.045 | ≤0.035 | ≤0.30 | 19.5–20.5 | 17.5–18.5 | 6.00–6.50 | 0.18–0.22 | Cu: 0.50–1.50 |
Heat Treatment Requirements
- Heat treatment is required for all ASTM A269 stainless steel tubing to ensure compliance with specifications.
- Tubing must be heat treated in a non-contaminating environment to maintain material integrity.
- Solution annealing is the primary heat treatment process for stainless steel tubing under ASTM A269.
- Recommended annealing temperature ranges from 1,900°F to 2,100°F (1,040°C to 1,150°C) depending on the grade.
- Cooling must be conducted at a sufficient rate to avoid carbide precipitation and maintain corrosion resistance.
- Controlled atmospheres or protective environments are used during heat treatment to prevent oxidation or surface contamination.
- Specific time and temperature cycles must be followed to achieve optimal mechanical properties and microstructure.
- Verification of heat treatment is required through physical and/or metallurgical tests outlined in the standard.
- Tubing that has been cold-worked may require additional heat treatment to relieve residual stresses or homogenize hardness.
- Traceability of the heat treatment process must be documented and certified to ensure compliance with ASTM A269 requirements.
Tensile Requirements
| Grade | UNS Designation | Tensile Strength (Min.) (Ksi) | Tensile Strength (Min.) (MPa) | Yield Strength (Min.) (Ksi) | Yield Strength (Min.) (MPa) | Notes |
|---|---|---|---|---|---|---|
| TP304 | S30400 | 75 | 515 | 30 | 205 | - |
| TP304L | S30403 | 70 | 485 | 25 | 170 | - |
| TP316 | S31600 | 75 | 515 | 30 | 205 | - |
| TP316L | S31603 | 70 | 485 | 25 | 170 | - |
| TP317 | S31700 | 75 | 515 | 30 | 205 | - |
| TP321 | S32100 | 75 | 515 | 30 | 205 | - |
| TP347 | S34700 | 75 | 515 | 30 | 205 | Welded & seamless |
| TP347H | S34709 | 75 | 515 | 30 | 205 | - |
Pipe Testing Requirements
Flaring Test (Seamless Tubes)
- Each seamless tube must undergo a general flare test.
- The pipe is opened to a specified angle during the test to ensure quality and compliance.
Flange Test (Welded Tubes)
- Each welded tube must be subjected to a general flange test.
- The pipe is opened to a specified angle to verify structural integrity.
Hardness Test
- Rockwell hardness testing is conducted to confirm the pipe meets specified hardness requirements.
- Two readings are taken on the pipe, ensuring the difference between readings does not exceed 20%.
- If readings vary by more than 20%, a third test is performed at another point, and the average of the three readings is used for compliance.
- Testing results are typically verified by a quality control supervisor in a controlled lab environment.
Reverse Flattening Test (Welded Tubes)
- This test ensures the integrity of the weld in welded tubes.
- The test involves flattening the tube to a specified degree to confirm weld strength without causing any cracking.
Hydrostatic or Nondestructive Testing
- Each pipe must undergo either a hydrostatic pressure test or an approved alternative nondestructive test.
- These tests ensure the pipe can handle required pressure levels and detect any defects without damaging the material.
Markings
- Each tube must be marked with clear and legible information, including:
- Manufacturer name
- Material designation
- Heat number
- For bundled pipes, each bundle should carry these markings.
- Each tube must be marked with clear and legible information, including:
Compliance Certification
- A signed certificate must be issued to confirm that the pipes meet the specified API or ASTM standards.
- All testing results are verified for compliance with the relevant specifications.
References
- ASTM A269 – Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service.
- ASTM A370 – Standard Test Methods and Definitions for Mechanical Testing of Steel Products.
- ASTM E18 – Standard Test Methods for Rockwell Hardness of Metallic Materials.
- ASTM E213 – Standard Practice for Ultrasonic Testing of Metal Pipe and Tubing.
- ASTM E309 – Standard Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation.
- API 5L – Specification for Line Pipe, covering seamless and welded steel pipes for conveying gas, water, and oil.
- API 1104 – Welding of Pipeline and Related Facilities, addressing welding quality and inspection for pipeline systems.
- NACE MR0175/ISO 15156 – Materials for use in H2S-containing environments in oil and gas production to ensure corrosion resistance.
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