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某高压锅炉汽包,材料采用 Mn—Ni—Mo—V 型的低合金高强度钢,其化学成分(%)及机械性能如下:C≤0.20 Si≤0.40Mn1.0～1.65 V0.1～0.22Mo0.2～0.6 Ni0.4～0.8S≤0.025 P≤0.025δ_b60～70公斤/毫米~2δ_s43公斤/毫米~2 δ≥16%a_k≥5公斤·米/厘米~2180°冷弯(D=3T)δ_s350℃≥37公斤/毫米~2该汽包内径为1600毫米,壁厚为75毫米,总长约14米左右,汽包的工作压力为156公斤/厘米~2,工作温度为350℃。整个汽包由两只球形封头及五节筒身所组成。筒体上装有四只或五只大口径下降管、其直径约500毫米,管壁厚度50毫米。下降管同汽包筒体的连接结构为“内伸式”。即下降管插入筒身,焊缝坡口为“K”型,下降
A high-pressure boiler drum, the material used Mn-Ni-Mo-V low alloy high strength steel, its chemical composition (%) and mechanical properties are as follows: C ≤ 0.20 Si ≤ 0.40Mn1.0 ~ 1.65 V0.1 ~ 0.22 Mo0.2 ~ 0.6 Ni0.4 ~ 0.8S≤0.025 P≤0.025δ_b60 ~ 70kg / mm ~ 2δ_s43kg / mm ~ 2δ≥16% a_k≥5kg · m / cm ~ 2180 ° Cold bend (D = 3T ) δ_s350 ℃ ≥37 kg / mm ~ 2 The drum diameter of 1600 mm, wall thickness of 75 mm, a total length of about 14 meters, the drum of the working pressure of 156 kg / cm ~ 2, the working temperature is 350 ℃. The entire drum consists of two spherical heads and five cylinder body. The cylinder is equipped with four or five large diameter drop pipe, the diameter of about 500 mm, the wall thickness of 50 mm. The connecting structure of the descending pipe and the steam drum body is “in extension type”. That is, down tube inserted into the barrel, the weld groove is “K” type, down