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机车大烟管是制造蒸汽机车锅炉和修理蒸气机车锅炉用的重要管材,装在蒸汽机车锅炉的心脏部位。制造一台新的蒸汽机车需用外径133毫米、壁厚4毫米的钢管5.1吨和外径卫33毫米、壁厚4.5毫米的钢管5.7吨。在我国能源以煤炭为主而铁道部门还需要大量蒸汽机车的今天,机车大烟管的需要量是很大的。这种管材由于装在机车锅炉的心脏部位,要在较高的温度和较大的压力下工作,因此,这种管材不仅要有较好的机械、物理性能、较高的几何尺寸精度、光洁的内外表面和定尺长度,而且还要求有较好的弯管、卷边、缩径、焊接等工艺性能。为了满足这种管材性能的要求,在轧制生产过程中要求有严格的温度制度和轧制制度。钢的化学成分通常控制在下述范围:
Locomotive smoke pipe is to create steam locomotive boilers and steam locomotive boiler repair important pipe, installed in the heart of the steam locomotive boiler. A new steam locomotive is required to produce 5.1 tons of steel pipes with an outside diameter of 133 mm and a wall thickness of 4 mm and 5.7 tons of steel pipes with an outside diameter of 33 mm and a wall thickness of 4.5 mm. In our country, where coal is the main source of energy and the railway department still needs a large number of steam locomotives, the demand for locomotive smoke pipes is enormous. Because of this pipe installed in the heart of the locomotive boiler to work at higher temperatures and greater pressure, therefore, this pipe not only have better mechanical and physical properties, high geometric precision, clean Of the inner and outer surface and length of the length, but also requires a better bend, curling, diameter reduction, welding and other process performance. In order to meet the performance requirements of this pipe, the rolling process requires strict temperature and rolling system. The chemical composition of steel is usually controlled in the following range: