1. Nominal diameter is 25mm, and the corresponding outer diameter is about 33.5mm.
2. Nominal diameter is 32mm, and the corresponding outer diameter is about 42.4mm.
3. Nominal diameter is 40mm, and the corresponding outer diameter is about 50.8mm.
4. Nominal diameter is 50mm, and the corresponding outer diameter is about 61.8mm.
5. Nominal diameter is 65mm, and the corresponding outer diameter is about 76.2mm.
6. Nominal diameter is 80mm, and the corresponding outer diameter is about 88.9mm.
7. Nominal diameter is 100mm, and the corresponding outer diameter is about 114.3mm.
8. Nominal diameter is 125mm, and the corresponding outer diameter is about 139.7mm.
9. Nominal diameter is 150mm, and the corresponding outer diameter is about 168.3mm.
10. Nominal diameter is 200mm, and the corresponding outer diameter is about 219.1mm.

The nominal diameter of hot-rolled seamless steel pipe can be up to 600mm, while the maximum nominal diameter of cold-rolled seamless steel pipe is 200mm.

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