《天工开物·下篇·五金》
炼钢的方法是：先将熟铁打成约有寸半长像指头一般宽的薄片，然后把薄片包扎尖紧，将生铁放在扎紧的熟铁片上面。再盖上破草鞋，在熟铁片底下还要涂上泥浆。
凡钢铁炼法，用熟铁打成薄片如指头阔，长寸半许，以铁片束尖紧，生铁安置其上，又用破草履盖其上，泥涂其底下。
The method of steelmaking is: first beat the wrought iron into thin sheets about one and a half inches long and as wide as a finger, then wrap the sheets tightly, and place the pig iron on top of the tightly packed wrought iron sheets. Then cover it with broken straw shoes and apply mud under the wrought iron sheets.