Sulphur Cored Wires

SULPHUR ADDITION IN STEEL:

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Many steel specifications require significant alloying quantities of sulphur, primarily for it ability to improve machinability of the final product. Indeed, in some applications such as forging dies, the product may be ordered to any one of a number of machina bility ratings as well as hardenability and other factors. Sulphur is used as an alloying addition to improve machinability. Increasing the sulphur content from nominal say 0.008% to 0.060% lowers the sharpy upper shelf level, thereby raising the transition temperature as fixed by a given impact energy.

ADDITION PRACTICE:

The addition of sulphur, and close control over the degree of addition, is an important step in the steelmaking process. There is various ways to add sulphur into steel melt. Usually the sulphur is added in steel melt (temperature 1500 - 1600°C) the form of stick sulphur which is, essentially, elemental sulphur. From experience it has been determined that recovery of about 40 - 50% can be expected from stick sulphur. The non-recovered sulphur easily ignites in air to form sulphur dioxide, a noxious gas with a strong, pungent objectionable odor. Since the density of the stick sulphur (2.08 gm/cc) is low and the boiling point (444.72°C) is also low. this sulphur vapor generation, and subsequent sulphur dioxide fume generation, occurs before molten steel reactions involving sulphur can reach completion. As those skilled in the art will appreciate. the steel reactions are essentially the formation of Mn S in the steel which is non-odorous coupled with the vaporization of uncombined sulphur, which vaporization causes environmental conditions to become very objectionable.

Whereas in cored wire Injection system the recovery of sulphur is 60 - 70% with precise control of composition. In sulphur cored wire, sulphur is encapsulated in steel sheath, when injected into steel it can go in depth of steel melt as shown in figure, where due to sufficient ferrostatic pressure. sulphur bubbles slowly raise to surface and react efficiently in steel melt and also control of wire feeding with help of wire feeder at desired speed ensures high recovery, precise composition control and less fumes generation. Thus the cored wire injection into the steel is environmental friendly due to less fumes generation and economical due to high recovery and less heat rejection.

 

Selenium Cored Wire Specification:

 

Chemical composition of Sulphur Cored Wire
Grade S (Min) Si (Max) Moist (Max)
S 98 98 0.2 0.3

 

Powder specification
Grade density (g/cm3) Melting
Point
(°C)
Boiling
Point
(°C)
Size (mm)
S 2.08 115 -­ 120 444.7 0.106 – 0.2
Strip Specification
Grade Diameter
(0, mm)
Thickness (mm)
EDD IS 513 9±0.5
13±0.2
0.40
±0.03
0.40±0.03
Wire Characteristics
Grade Diameter ( 0, mm) Shape Powder Fill (gm/mt)
S

9 ± 0.5

13±0.2

Round

Round

100 ± 10

200±20

Coil Specification (Flipping Coil – Horizontal & Vertical)
Details

9 mm 0

13 mm 0
Coil Identification

 

F1-­02 F1-­05  F1-­02 F1-­05
Powder Weight
(MT)
0.250 0.500 0.500 1.000

All coils are color coded and fixed with a detailed sticker clearly displaying details such as coil no., powder content, strip weight, gross weight density & length. A fluorescent sticker displays the name of the product in bold letters on the outer diameter of the coil.

Handling

No metal sling, chain or rod is to be used across the ID of the coil for handling as it may damage the coil. Use only polyester, synthetic slings, fork lift/tractor to handle the coil. The pallet is an integral part of the coil and it is to be removed till the coil is consumed.

Shelf Life

Follow the shelf life period specified by MINEX








Strip Weight
(MT)
0.300 0.600  0.435 0.870
Net Weight
(MT)
0.550 1.100  0.935 1.870
Length (Mtrs) 2500 5000  2500 5000
Internal
Diameter (mm)
650 650  650 650
External
Diameter (mm)
800 1000 1100 1170
Height (mm) 630 630  630 630
Packing Storage & Safety

Packed in flipping cage and mounted on wooden / mild steel pallet and Strapped with pallet horizontally or vertically. All coils are wrapped in stretch film & palletized.

To be stored in dry & covered area away from heat and moisture. Material Safety data sheet can be Supplied on demand.