American Standard Seamless Steel Pipe

1. **ASTM A106**: This standard covers seamless carbon steel pipe for high-temperature service in the oil, gas, and petrochemical industries. It is commonly used for applications requiring elevated temperatures, like power plants and refineries.

2. **ASTM A53**: This specification covers seamless and welded black and hot-dipped galvanized steel pipe in NPS (nominal pipe size) from 1/8 to 26. It is widely used for plumbing, fire sprinkler systems, and other applications where steel pipe is required.

3. **ASTM A312**: This standard is for seamless and welded austenitic stainless steel pipes intended for high-temperature and general corrosion service. These pipes are commonly used in the food, beverage, and pharmaceutical industries due to their corrosion resistance.

4. **API 5L**: This standard specifies requirements for seamless and welded pipes suitable for use in transportation and distribution of petroleum, natural gas, and other liquids. API 5L grades are typically used in the oil and gas industry for conveying gas, water, and oil.

Seamless steel pipes have several advantages over welded pipes, including better mechanical properties, greater pressure-bearing capacity, and higher durability, making them suitable for critical applications where reliability and safety are paramount.