A53/A53M Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

1. Scope  

ASTM A53/A53M specifies requirements for welded and seamless steel pipe in three types:  

- Type F (Furnace-welded, continuous weld)  

- Type E (Electric-resistance welded, ERW)  

- Type S (Seamless)  

Pipes are used for mechanical and pressure applications (e.g., plumbing, steam, air, gas) and are suitable for welding.  

 2. Ordering Information  

Buyers must specify:  

- Standard designation (A53/A53M)  

- Type (F, E, or S) and Grade (A or B)  

- Size (NPS or DN) and schedule/thickness  

- Length (random or specific)  

- End finish (plain, threaded, bevelled, etc.)  

- Coating (if required, e.g., galvanized)  

- Additional testing (e.g., hydrostatic, nondestructive examination)  

 3. Steel Grades & Chemical Composition  

- Grade A: Minimum tensile strength 330 MPa (48 ksi), yield strength 205 MPa (30 ksi).  

- Grade B: Minimum tensile strength 415 MPa (60 ksi), yield strength 240 MPa (35 ksi).  

- Carbon content: ≤0.25% (Grade B), ≤0.30% (Grade A).  

 4. Mechanical Properties  

- Tensile and yield strength: As per grade requirements.  

- Bend test: Required for Type F and E pipes < NPS 4.  

- Flattening test: For seamless and ERW pipes.  

- Hydrostatic test: Mandatory for all pipes unless replaced by nondestructive testing (NDT).  

 5. Inspection & Testing Requirements  

- Hydrostatic testing: Minimum test pressure = 2.4 MPa (350 psi) for ≤ NPS 3 or higher as specified.  

- Nondestructive testing (NDT): Permitted as an alternative to hydrostatic testing for Types E and S.  

- Visual inspection: No defects affecting performance.  

- Certification: Mill test reports (MTRs) must be provided upon request.  

 6. Coating (Optional)  

- Galvanized pipes: Must comply with ASTM A53 coating weight and adhesion requirements.  

 7. Marking Requirements  

Pipes must be marked with:  

- Manufacturer’s name or trademark.  

- ASTM A53/A53M, type (F, E, S), grade (A/B), size, and heat number.  

- Coating designation (if applicable).  

 Key Notes  

- Dimensional standards: Pipes conform to ASME B36.10M (sizes and schedules).  

- Threading: If threaded, must comply with ASME B1.20.1.  

This standard is widely used in construction, oil & gas, and low-pressure systems. For critical applications, stricter standards (e.g., ASTM A106 for high-temperature service) may be preferred. 

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