Pig Iron วัสดุสำหรับเป็นส่วนผสมการหลอมเหล็กจากประเทศบราซิล

PIG IRON DESCRIPTION	Grey	grey
Weight average: 6 to 8 Kg Base length : 177 mm Superior length: 75 mm Base width: 110 mm Superior width: 31 mm Height: 102 mm	Nodular	Nodular

PIG IRON TYPES & APPLICATIONS

There are two types of pig iron: basic or steel making and foundry

1 – basic

Used as raw material (input) to produce steel as a scrap’ alternative.This is the cheapest and easiest type to produce since it requires a not very special iron ore.

Average specifications are:

 Low Si = 1,50 % max. / meaning a higher productivity

“high” P  =   0,15 % max. / meaning a cheaper iron ore and a non specified charcoal

“high” S  = 0,05 % max. / ditto

Free Mn = 1,00 % max / no worry about this element and no cost as well

 2 – Foundry

 Used as input to produce parts since the most sophisticated to the simplest as the so-called municipals (manholes, culverts etc) and counterweights.

This type is divided in two sub types, grey and nodular.

 2.1 – Grey pig iron

 Usually has high silicon (1,50 – 2,00 % , 1,75 – 2,00 % , 2,00 – 2,25 % etc up to 3,25 – 3,50 %)

The higher the Si the lower the productivity and as a consequence the most expensive to produce.

It has also an specified interval of manganese (0,50 – 1,00 %, 0,30 – 0,90 % etc) meaning you have to add this element (higher cost) and to control its content during production.

 2.2 – Nodular pig iron

 Used as input to produce very special parts requirind a very special iron ore and sharcoal  and a chemical treatment as well.

It has usually  low silicon but eventually it can be higt. The lower phosphorus, manganese and sulphur you reach the best nodular you produce.

The biggest nodular volume worldwide is the so called triple five:

Si         0,50 % max.

P          0,05 % max.

Mn      0,05 % max.

C         3,50 – 4,50 %

S          0,015 % max. or 0,02 % max.

Depending on the market they can demand lower Mn e P as 0,02 % max., 0,025 % max., 0,03 % max. etc.

It is also usual foundries to use a semi nodular.

Exemple:         Si         0,50 – 1,00 %

P           0,08 % max. or 0,10 % max. 

Mn       0,08 % max. or  0,10 % max.

C          3,50 – 4,50 %

S          0,02 % max.

Pig iron types composition

(typical)

	Si	P	Mn	C	S
Basic	1,50 % max.	0,15 % max.	1,00 % max.	3,50 – 4,50 %	0,05 % max.
Grey	2,50 – 3,00 %	0,12 % max. 0,15 % max. 0,10 % max.	0,50 – 1,00 % 0,30 – 0,90 %	3,50 – 4,50 %	0,03 % max.
Nodular	0,50 % max.	0,05 % max. 0,035 % max. 0,02 % max.	0,05 % max. 0,02 % max.	3,50 – 4,50 %	0,015 % max. 0,020 % max.
Semi-nodualar	0,50 – 1,00 %	0,10 % max. 0,08 % max.	0,10 % max. 0,08 % max.	3,50 – 4,50 %	0,020 % max.

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