Low temperature carbon steel pipe
Low temperature carbon steel pipe is a medium carbon structural steel. It has good performance in cold and hot heating, good mechanical properties, low price and wide source, so it is widely used. Its biggest weakness is low hardenability, and workpieces with large cross-sectional dimensions and relatively high requirements should not be used. Cold steel running at low temperature can withstand a certain low temperature impact. A commonly used standard is ASTM A333. The quenching temperature of low temperature carbon steel pipe is A3+(30 ~ 50) ℃. In practice, the upper limit is generally taken. The high quenching temperature can accelerate the heating rate of the low temperature carbon steel pipe, reduce the surface oxidation, and improve the work efficiency. In order to homogenize the austenite of the workpiece, a sufficient holding time is required. If the actual furnace load is large, it is necessary to appropriately extend the holding time. Otherwise, there may be insufficient hard...