Elbow are shorter than bend. There are many types of elbows, such as seamless elbows and carbon steel elbows, which are two typical elbows. In addition, elbows and bend are different in some aspects.

1. Appearance. The elbow is relatively short compared to the bend. R=1 times to 2 times are elbows, and R>2 times are bend. The radius of curvature of the elbow is small, usually are 6D, while the bend is 40D.

2. Manufacturing process. The bend can be made of straight pipe with one-time molding, which not need to do anti-corrosion. The elbow should be customized, and it needs to do anti-corrosion, which makes it has long lead time.

3. Price. The elbow needs to be customized and need to do anti-corrosion, so that its price is higher than the bend. But it has high cost performance. The bend is easy to be damaged since it isn't do anti-corrosion treatment, but it is widely used in some projects that are not very demanding because of its low price.