Lead For Free Machining Steels Minex Metallurgical Co. Ltd.

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1 Minex Metallurgical Co. Ltd.

2 LEADED STEEL Lead is added to steels for improving machinability. Lead is only slightly soluble in liquid or solid steel and, when added, some will be present as a dispersion of discrete but preferably submicroscopic metallic lead inclusions. In the cut, lead acts as a lubricant between the cutting tool and the workpiece, resulting in longer tool life. This lubricity reduces friction in the secondary shear zone as the chip slides over the face of the cutter. It also helps create more manageable chip configurations by helping the chip to curl and break rather than string out into birds' nests. Lead has a melting point around 621º F well below steel. As heat builds in the cut, the lead is able to leech out of the steel and lubricate the cutter/part interface. This reduces the heat generated in all three shear zones and leads to longer tool life and the possibility of increased speeds and feeds. The concentration of lead, sufficient to produce the desired free machining properties, is in the range of %. Lead is used alone or in combination with bismuth, tellurium or selenium depending upon the application requirement. Lead can be used in the form of round shots or cored wire. The recovery of lead with shots addition ranges between 60-75% whereas in case of cored wire the recovery is higher i.e. between 75-90%. Although lead s boiling point is above normal temperature the metal does have a high vapor pressure and addition will be accomplished by considerable fuming. These vapors are toxic and sufficient venting should be provided. Lead Alloy Specification Alloy Chemical Composition (%) Pb Cu Sn As Sb Zn Bi Fe Physical Properties Specific Gravity (gm/cc) Melting Range (0C) B.P (0C) 99.9 % Shape & Size Std. Size Ingot Granules Powder Shots 0 1.5, Cored Wire See the Cored wire specification section Std. Weight (Kg) Wooden Box Steel Drum HDPE Jumbo Bag *50 Kg * *50 Kg* *1 MT* *Standard, #Optional Storage Use Dry & Cool Place to store the material to avoid contamination and reaction with moisture. Addition agents should be kept dry in sealed containers.

3 Safety Lead addition will be accompanied by considerable fuming. These vapors are toxic and must be vented to keep atmospheric concentrations below the permissible TLV-TWA limit of 50µg/m3 of air. Residual blood lead levels of workers should be checked periodically to keep them within the OSHA recommended maximum value of 40µg/100 g. Material Safety Data Sheet can be supplied on demand. Lead Cored Wire Specification Pb(Min) Oths. Pb Powder Specification Density (gm/cc) Melting Point ( C) Boiling Point ( C) Size Pb Wire Characteristics (, mm) Shape Powder Fill (gms/mt) Pb 99 9±0.5 Round 460 ± 30 13±0.2 Round 1000 ± 50 16±0.2 Round 1400 ± 50 Strip Specification EDD IS-513 9± ± ± ± ± ± 0.03 Coil Specification (Flipping Coil- Horizontal & Vertical) Details Powder Weight Strip Weight Net Weight Length (mtrs.) Internal External Height 9 mm 13 mm 16 mm F1-05 F1-10 F2-05 F2-10 F Coil Identification All coils are colour coded, and affixed with a detailed sticker clearly displaying details such as coil number, 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 I.D 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 not to be removed till the coil is consumed. Shelf Life Follow the shelf life period specified by Minex. 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. Storage & Safety To be stored in dry & covered area away from heat and moisture. Material Safety data sheet can be Supplied on demand.

4 Lead Calcium Carbonate Alloy Specification Pb CaCO3 Oths. PbCaCO PbCaCO Physical Properties Density (gm/cc) Melting Point ( C) Boiling Point ( C) Size Pb CaCO3 Pb CaCO (Decomposition Point) Shape & Size Std. Size Powder Pb: , CaCO3: Cored Wire See the Cored wire specification section Std. Weight (Kg) Wooden Box Steel Drum HDPE Jumbo Bag *50 Kg * *50 Kg* *1 MT* Storage Use Dry & Cool Place to store the material to avoid contamination and reaction with moisture. Addition agents should be kept dry in sealed containers. Safety Lead addition will be accompanied by considerable fuming. These vapors are toxic and must be vented to keep atmospheric concentrations below the permissible TLV-TWA limit of 50µg/m3 of air. Residual blood lead levels of workers should be checked periodically to keep them within the OSHA recommended maximum value of 40µg/100 g. Material Safety Data Sheet can be supplied on demand. Lead Calcium Carbonate Cored Wire Pb CaCO3 Oths. PbCaCO PbCaCO Powder Specification Density (gm/cc) Melting Point (0C) Boiling Point (0C) Size Pb CaCO3 Pb CaCO (Decomposition Point) Strip Specification EDD IS-513 9± ± ± ± 0.03 Wire Characteristics (, mm) Shape Powder Fill (gms/mt) Pb CaCO3 9±0.5 Round 440 ± 30 13±0.2 Round 970 ± 50

5 Coil Specification (Flipping Coil- Horizontal & Vertical) Details Powder Weight Strip Weight Net Weight Length (mtrs.) Internal External Height 9 mm 13 mm F1-05 F1-10 F1-05 F Coil Identification All coils are colour coded, and affixed with a detailed sticker clearly displaying details such as coil number, 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 I.D 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 not to be removed till the coil is consumed. Shelf Life Follow the shelf life period specified by Minex. 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. Storage & Safety To be stored in dry & covered area away from heat and moisture. Material Safety data sheet can be Supplied on demand.