fangkuuaih 写了： 2024年 5月 12日 08:16
嘎嘎响，又尼玛在胡搅蛮缠。
氧化铅1470 ℃才蒸发。
最重要的是，锻打铁锅的温度只要700-1000度，铁锅有一点软即可，远远不用铁的熔化温度。
尼玛打造铁锅家加硫，加卤素？
你就是纯煞笔玩意。
唐人街脑残二逼，连生铁中含铅量极其微小这等基本常识都不懂，对世界的认知不是靠学习，而是充分自己发挥“主观能动性”
把烧开水脑补到炼铁上来，还鸡巴恬不知耻的和人争
看好了
Lead in cast iron
Solubility of lead in cast iron is very low; however, some types of pig iron may contain up to 0.003 % Pb. Due to lead-containing raw materials in the furnace charge, the lead content may be increased to 0.02 %.
Lead contents of more than 0.003 % in nodular graphite cast iron cause formation of Widmanstätten graphite and drastically reduce resistance against formation of cracks. Lead contents of this extent stabilize the pearlite phase (see also Pearlite stabilization).
If only magnesium is added to cast iron to promote the formation of nodular graphite (s. Nodular graphite cast iron), lead contents of more than 0.003 % have a rather negative effect. However, this effect is reversed if low Cer quantities are added together with the magnesium.
如果要铁中含铅也可以，要特意添加，这个可不叫“杂质”，而是为了提高工艺。但添加铅显然不算是铸铁了
目的是：
Lead is insoluble in molten iron and usually does not bond with the accompanying and alloy elements present in steel, either. In the solid materials, lead is present in the form of metal particles of sub-microscopic size and finest distribution. The most types of iron ore only contain very low quantities of lead. Usually, the contents in steel are less than 0.01 %.
However, lead is frequently used for steel production to achieve improvement of the material’s machinability at high cutting speeds. The element is added in metal form in quantities of around 0.25% during casting of the steel into ingots. The addition of lead improves the workability of unalloyed or low-alloyed steels even if the machinability of such types of steel is already very good due to relatively high sulfur and phosphorous contents. The improved machinability properties are attributed to the fact that the finely distributed lead particles have a chip-breaking effect. This prevents excessive generation of heat, which would otherwise develop due to friction between the cutting tool and the long, spiral-shaped chips.
Steels treated with lead can be processed at cutting speeds that are around 30% higher than for lead-free steels. These types of free-cutting steels can be soldered and welded without problems and are perfectly suitable for heat treatment and surface finishing
By the addition of lead, hardenability is slightly decreased, while it has hardly any influence on mechanical properties, for example. The latter is in contrast with sulfur- and phosphorous-containing free-cutting steels, with which improved machinability entails embrittlement.