The ovality of the reducer should not exceed 1% of the corresponding end outer diameter, and the allowable deviation is ±3mm. The material of the reducer is in compliance 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.

Diameter reducing fittings (elbows) are pipe components used in areas where pipe sizes change. The commonly used forming processes include necking down, expanding, or a combination of both. For certain sizes of reducing fittings, stamping forming can also be applied.