**1. What is the difference between ASTM and ASME pipe?**
- **ASTM** (American Society for Testing and Materials) specifies the **material standards** for pipes, including composition, mechanical properties, and testing methods (e.g., ASTM A106 for seamless carbon steel pipes).
- **ASME** (American Society of Mechanical Engineers) defines **design, fabrication, and application standards** for pipes used in pressure systems (e.g., ASME B36.10M for dimensions). ASME codes (like B31.3 for process piping) often reference ASTM materials but focus on engineering and safety requirements.
**2. Is ASTM a code or standard?**
ASTM develops **standards**, not codes. These standards define material properties, testing methods, and manufacturing processes. Codes (e.g., ASME Boiler and Pressure Vessel Code) are legal or regulatory documents that incorporate standards for compliance.
**3. What is the ASME standard for pipe?**
Key ASME pipe standards include:
- **ASME B36.10M**: Covers dimensions for welded and seamless wrought steel pipes (e.g., NPS sizes, schedules).
- **ASME B36.19M**: Addresses stainless steel pipe dimensions.
- **ASME B31 Series**: Codes for piping systems (e.g., B31.1 for power plants, B31.3 for process piping).
**4. How many types of ASTM are there?**
ASTM has **over 12,000 standards** across industries. For pipes and steel, common categories include:
- **Carbon steel**: ASTM A53, A106, A333.
- **Stainless steel**: ASTM A312, A358.
- **Alloy steel**: ASTM A335.
These are grouped by material type, application (e.g., high-temperature, low-temperature), and manufacturing method (seamless vs. welded).
**5. What is the most common ASTM steel?**
- **Structural steel**: ASTM A36 (general construction).
- **Piping**:
- **ASTM A53**: Welded/seamless carbon steel pipe for low-pressure applications.
- **ASTM A106**: Seamless carbon steel pipe for high-temperature service.
- **Stainless steel**: ASTM A312 (common in corrosive environments).
