The diameter variation of the reducer should not exceed 1% of the corresponding end outer diameter, with allowable deviation of ±3mm. The material of the reducer complies with SY/T5037, GB/T9711, GB/T8163, ASTM A106/A53 GRB, API 5L, APT5CT, ASTM A105, ASTM A234, ASTM A106, DIN German standards, and customer-specified standards.

Reduced Bends (elbows) are pipe fittings used at the transition points where pipe diameters change. The commonly used forming processes include reducing and expanding, or a combination of both, and for certain sizes, stamping can also be employed.