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Welded Stainless Steel Mechanical Tubing - ASTM A554 Specification | China Suppliers & Factory
Ordering Information
Orders should specify:
- 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 and more
- 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, 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)
Q1: What is ASTM A554 and what products does it cover?
ASTM A554 is a standard specification that covers welded stainless steel mechanical tubing. It applies to both round and shaped (square, rectangular, oval, etc.) tubes used in structural and mechanical applications, manufactured from austenitic and ferritic stainless steel grades.
Q2: Which stainless steel grades are available under ASTM A554?
ASTM A554 includes a wide range of grades such as TP 304, TP 304L, TP 316, TP 316L, TP 430, and others. Austenitic (300-series) grades offer excellent corrosion resistance, while ferritic (400-series) grades provide good oxidation resistance at elevated temperatures.
Q3: What testing is required for ASTM A554 mechanical tubing?
Each tube must pass either a hydrostatic test or a nondestructive electric test (NDET) unless waived by the purchaser. Additional tests including chemical analysis, mechanical tests (tensile, hardness, bend), and visual inspection may also be required depending on the order specifications.
Q4: What information is needed when placing an order for ASTM A554 tubing?
A complete order should include the quantity, material grade, dimensions (OD, wall thickness, shape), tolerance level, surface finish, test requirements, and any certification or special packaging needs. Providing all details upfront ensures accurate and timely fulfillment.
Q5: What surface finishes are available for ASTM A554 stainless steel tubes?
Available finishes include annealed, pickled, polished (various grit levels), and bright annealed. The appropriate finish depends on the application — polished finishes are commonly specified for decorative or hygienic uses, while pickled finishes suit industrial applications.
Q6: Are mill test reports and certifications provided with ASTM A554 tubing?
Yes. Mill certification confirming compliance with ASTM A554 is available upon request. Each tube or bundle is marked with the manufacturer's name, material grade, size, heat number, and the applicable standard designation (A554) for full traceability.