puddling


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Related to puddling: Puddling furnace

puddling:

see Henry CortCort, Henry,
1740–1800, English inventor. He revolutionized the British iron industry with his use of grooved rollers to finish iron, replacing the process of hammering, and through his invention of the puddling process.
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Puddling

 

a metallurgical process for the conversion of pig iron into mild, low-carbon iron, produced in a pastelike state on the hearth of an internally fired reverberatory (puddling) furnace. Puddling, which replaced bloomery conversion, was characterized by higher productivity, and it also permitted the replacement of expensive and scarce wood charcoal with coal and other types of fuel. A reverberatory furnace was used for the first time to produce wrought iron in England in 1766 by the brothers T. and D. Cranedge, who used coal as a fuel. The process was perfected in 1784 by H. Cort, who played a major role in the widespread adoption of the process.

In essence, the process requires that pigs of iron be loaded onto the hearth of a puddling furnace. The molten metal and slag found in the furnace are stirred (puddled) with metallic rods in order to increase the contact surface. The small lumps of iron formed on the furnace hearth are rolled onto a rod to form a bloom, usually 40–60 kg in weight. The bloom is then removed from the furnace, hammered, and conveyed to rolling. Puddling iron is readily welded or worked into shapes and contains little phosphorus or sulfur and few nonmetallic inclusions.

Having come into widespread use at the beginning of the 19th century, puddling was the basic method of producing large quantities of iron and steel. During the second half of the 19th century, the more advanced converter process (seeBESSEMER PROCESS) and open-hearth process of converting pig iron into steel began replacing puddling. Puddling has not been used in the USSR since the 1930’s.

REFERENCES

Metallurgiia stali. Moscow, 1961.
Ocherki istorii tekhniki v Rossii (1861–1917). Moscow, 1973.
Mezenin, N. A. Povest’ o masterakh zheleznogo dela. Moscow, 1973.

IA. D. ROZENTSVEIG

puddling

[′pəd·liŋ]
(metallurgy)
A process for the production of wrought iron by agitation of a bath of molten pig iron with iron oxide in order to reduce the carbon, silicon, phosphorus, and manganese content.

puddle, clay puddle, puddling

Clay to which a little water has been added and which then has been tempered, to make it homogeneous and to increase its plasticity; used to prevent the passage of water.

puddling

1. Inducing compaction in mortar or concrete by the use of a tamping rod.
2.See puddle.
References in periodicals archive ?
Kirchhof G, Priyono S, Utomo WH, Adisarwanto T, Dacannay EV, So HB (2000) The effect of soil puddling on the soil physical properties and the growth of rice and post-rice crops.
Mohanty M, Painuli DK, Mandai KG (2004) Effect of puddling intensity on temporal variation in soil physical conditions and yield of rice (Oryza sativa L.
Mohanty M, Painuli DK, Mandai KG, Pachlaniya NK, Misra AK (2006) Cracking of a vertisol as influenced by puddling and residue management under rice wheat cropping system.
Mousavi SF, Yousefi-Moghadam S, Mostafazadeh-Fard B, Hemmat A, Yazdani R (2009) Effect of puddling intensity on physical properties of a silty clay soil under laboratory and field conditions.
Dispersible clay and clay plus silt of the puddled layer was measured 1 week and 2 months and 4 months after puddling.
The changes in soil texture within the puddle layer as a consequence of redistribution of soil particles during settling after soil puddling was evaluated.
The effect of puddling ratio on the soil physical properties on the 3 different-textured soils was assessed using linear and multi-variable regression procedures.
Table 1 shows that the puddling ratio was significantly related to dispersible clay, clay plus silt, saturated hydraulic conductivity, and bulk density.
The effect of soil type and puddling intensity on light interception 29 days after sowing (Fig.
Puddling intensity increased yields on the loam but decreased yields on the silty loam.
Figure 6 shows the results of the regression analysis for the 3 different soils in the puddling experiment.
Soil puddling can potentially be reduced without affecting rice yields, except on loam soils.