This article briefly introduces production process flow and its main equipments of seamless ERW pipe of 20 steel,and analyzes cause of transverse crack occurred in production of seamless ERW pipe of 20 steel,and gives out the main measures to solve transverse crack.

A numerical iteration method with one-dimension nonlinear mechanical modeling was (created) to analyze the transverse cracking of continuously reinforced concrete pavement subjected to (temperature) and drying shrinkage with consideration of the nonlinear bond slip between steel bar and (concrete) and the (nonlinear) friction slip between concrete slab and subgrade.