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Welded Stainless Steel Mechanical Tubing - ASTM A554 Specification from China Suppliers & Factory
Ordering Information
Orders should specify the following details to ensure accurate processing and delivery:
- Quantity (length or number of pieces)
- Material (stainless steel grade) – See Section 5
- Dimensions (OD, wall thickness, shape)
- Tolerance level (Table 1 for standard tolerances)
- Finish (annealed, pickled, polished, etc.)
- Test requirements (hydrostatic, nondestructive electric test, etc.)
- Certification & special packaging (if required)
Steel Grades & Chemical Composition
The standard includes austenitic (300-series) and ferritic (400-series) stainless steels, such as:
- TP 304, TP 304L, TP 316, TP 316L, TP 430, etc.
- Chemical composition must conform to ASTM A959 or other specified standards.
Mechanical Properties
- Tensile Strength, Yield Strength, Elongation: Varies by grade (Table 2)
- Hardness Requirements (if specified)
- Bend Test (for certain applications)
Manufacturing & Workmanship
- Tubes shall be welded and cold-worked (if applicable)
- Seamless equivalent properties can be achieved via additional processing
- Surface finish must be free of cracks, scale, or defects affecting performance
Inspection & Testing Requirements
- Hydrostatic or Nondestructive Electric Test (NDET) – Mandatory unless waived
- Chemical Analysis – Per heat/lot
- Mechanical Tests – Tensile, hardness, or bend tests as required
- Visual Inspection – For surface defects
- Certification – Mill test reports available upon request
Dimensions & Tolerances
OD, Wall Thickness, Length, Straightness, and Out-of-Roundness tolerances are specified (Table 1).
Certification & Marking
- Mill certification confirming compliance
- Marking includes manufacturer's name, grade, size, heat number, and standard (A554)
Supplementary Requirements (Optional)
- S1: Heat Treatment
- S2: Corrosion Testing
- S3: Special Tolerances
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❓ Frequently Asked Questions (FAQ)
Q
What is ASTM A554 and what does it cover?
ASTM A554 is a standard specification for welded stainless steel mechanical tubing. It covers the requirements for dimensions, chemical composition, mechanical properties, testing, and certification of stainless steel tubes used in mechanical and structural applications.
Q
Which stainless steel grades are available under ASTM A554?
ASTM A554 includes both austenitic (300-series) and ferritic (400-series) stainless steel grades, such as TP 304, TP 304L, TP 316, TP 316L, and TP 430. Chemical compositions must conform to ASTM A959 or other applicable standards.
Q
What testing is required for ASTM A554 tubing?
Mandatory testing includes a Hydrostatic Test or Nondestructive Electric Test (NDET), chemical analysis per heat/lot, mechanical tests (tensile, hardness, or bend), and visual inspection for surface defects. Mill test reports (certifications) are available upon request.
Q
What information is required when placing an order?
When ordering ASTM A554 tubing, you should specify the quantity, material grade, dimensions (OD, wall thickness, shape), tolerance level, surface finish, test requirements, and any certification or special packaging needs.
Q
Are supplementary requirements available for ASTM A554 tubing?
Yes. Optional supplementary requirements include S1 (Heat Treatment), S2 (Corrosion Testing), and S3 (Special Tolerances). These can be specified at the time of ordering based on your application needs.
Q
How is ASTM A554 tubing marked and certified?
Each tube is marked with the manufacturer's name, steel grade, size, heat number, and the applicable standard (A554). A mill certification confirming compliance with all specified requirements is also provided to ensure full traceability.