Paper on Cold-Rolling of Steels in Pil

Topics: Rockwell scale, Vickers hardness test, Tensile strength Pages: 24 (5426 words) Published: May 8, 2010


Pennar industries limited are a multi-product, multi-location enterprise. The company manufactures six different products.

• Cold rolled steel strips
• Cold rolled form sections
• Engineering components
• Road safety systems
• Precision tubes
• Fabrication

Pennar industries has received the ISO 9001,2000 quality certification from RWTUV of Germany and committed to achieving excellence in the quality of product.

The CRSS division, with its units at Patancheru, Isnapur and Chennai has combined annual cold rolling capacity of 1,20,000 Metric Tons. Pennar manufactures Steel Strips from 600mm to 750mm width and thickness range of 0.25 to 5.00mm both in coil and sheet form. Pennar caters to a wide range of customers from various sectors like:

• Automobiles
• Wide goods
• Domestic appliances
• Bearings
• General engineering industries


• Quality control measures at every stage of the manyfacturing process, right from the selection of raw material to chemical analysis using spectrometer. • Semi-continuous push-pell type pickling lines feed the rolling mill with scale free,iled and bright HR coils. • PLC-Controlled MECON WEAN UNITED 4-HI Rolling Mill.

• Bell type annealing furnaces for heat treating of cold rolled steel strip • Skin pass mills.CR Slitting lines and Cut to length lines. • Every process is closely monitored and end products are subjected to a battery of tests to determine Hardness, Tensile strength, Yield strength,% of Elongation, cupping test and Bend test in order to meet stringent customer specification. • Finished products are carefully packed, using polythene and gunny for coils and poly craft and wooden/steel pallets for sheets to provide total protection to the products during transit and handling.

Pennar Industries group is well known for fulfilling their commitments. Many times they have been awarded and rewarded. [pic]




The raw material for production of CRSS is ‘Hot Rolled Steel coils’ and these HR coils are produced by using “primary roughing mills” which is a 2-HI reversing mill with a 0.6 to 1.4 mm diameter rolls.

The main purpose of the mill is to reduce casting ingots into blooms. The work piece has to be pass 10-20 times between the rolls, to have a desired width, the work piece is made to pass through “edge grooves”. HR colis are also produced in ‘Universal Mills’ without edge grooves.

These coils are mainly low carbon steels which are either ‘Si’ or ‘Al’ killed.

Range 1. width 1350-1800 mm

2. Thickness 5-6 mm

Ultimate Tensile strength 80 kg /mm2 Yield strength 40 kg/mm

These Hot rolled coils are exported from many places like JINDAL STEEL WORKS (Karnataka), LLOYD STEELS LTD (Maharashtra), ESSAR STEELS LTD (Gujarat), ISPAT INDUSTRIES LTD (Maharashtra), SAIL etc..There will be a sticker present on every HR coil and it will be as follows…

Heat Number : 08201137 Coil Number : 0820113706/0 Grade/Specification : WG29AC Batch Number : 0001063785 Invoice Number : 2180040447 Invoice Date : 07.05.08 Net Weight...
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