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一般中压电站锅炉因为工作压力小(在60大气压以下),工作温度低(不大于450℃),所以锅炉中的各种联箱全用20号钢无缝钢管制成,壁厚在35公厘以下。而高压电站锅炉因工作压力大(≤140大气压),工作温度高(≤550℃),所以锅炉中的各种联箱不能完全用20号钢制造,还需用12ХМ、12ХМФ和15ХМ等合金钢管。我厂现在生产的工作压力为100大气压,工作温度为510℃,每小时蒸发量为230吨的高压锅炉中的过热器联箱,就是用厚度为40公厘的15ХМ无缝钢管作联箱筒身的。用这种钢作联箱筒身,不能用一般碳素钢焊条和 CB-08、CB-08A 自动焊丝来完成筒身对接缝和筒身与端盖的焊接工作。如果采用自动焊焊接,必须用 CB-12XM焊丝。因为我厂现在还没有这种牌号的合金钢焊丝,还不能采用自动焊焊接,只好采用手工焊。为了使联箱接头质量达到予期结果,在未正式生产以前,进行了15ХМ
In general, because of the small working pressure (below 60 atmospheres) and the low working temperature (not more than 450 ° C), the medium-pressure boiler is made of 20 # seamless steel tubes with a wall thickness of 35 Below the millimeter. The high-pressure boiler due to work pressure (≤140 atmospheric pressure), high temperature (≤550 ℃), so the boiler in a variety of header can not be completely made of steel 20, but also with 12ХМ, 12ХМФ and 15ХМ and other alloy steel pipe . Our factory now produces the working pressure of 100 atm, the operating temperature is 510 ℃, the evaporation of 230 tons per hour high-pressure boiler superheater header, is the thickness of 40 mm 15ХМ seamless steel tube for the joint tube Body With this steel for the joint barrel, you can not use the general carbon steel electrode and CB-08, CB-08A automatic welding wire to complete the body butt joint and barrel body and the end cover of the welding work. If using automatic welding, you must use CB-12XM wire. Because I plant now does not have this grade of alloy steel wire, can not use automatic welding, had to use manual welding. In order to achieve the expected joint header quality results, before the formal production, carried out 15ХМ