Gandhi Special Tubes Ltd.
Quality System as per ISO/TS 16949 : 2009 * ISO 9001:2008
Why Gandhi Tubes ???
Importance of Bright Annealed / Normalized Tubes for Hydraulic System
Tubes for medium/High Pressure Hydraulic application need to have high degree of reliability, ductility for forming operations like bending, flaring & ferrule biting etc. & they also need to be bright & scale-free as scale can come out under high pressure contaminating Hydraulic oil & damaging expensive Pump & Valves. 
Contamination is the direct or indirect cause of more hydraulic system failures than any other single cause. More than 90% of the Hydraulic System failures/breakdowns are on account of contamination. System efficiency is reduced to as much as 20% before it is recognized something is wrong.
Contamination affects Hydraulic System in many ways:
• Corrosion of Hydraulic equipments such as Pumps, valves, cylinder etc.
• Increased internal leakage which lowers efficiency of pumps, motors & cylinders. It decreases the ability of valves to control flow and pressure accurately. It also wastes horsepower and generates excess heat.
• Sticking of parts due to sludge or silting. Silting is a collection of fine particles in critical areas which will impair proper system operations.
• Seizure of parts or components caused by large amount of contaminants getting stuck in the clearance.
Therefore, Contamination prevention is a major concern for all who operate, service and maintain hydraulic systems. A small mistake involving injection of contaminants can result in damage to equipment that cannot have money value placed upon it. For example, if a hydraulic line that contains contaminated fluid is used to service Hydraulic equipment, it can result in damage to expensive equipment, loss of lakhs of rupees, or injury and loss of life to personnel on the jobsite.
"It is a challenge for Tube manufacturers to manufacture tubes meeting all these requirements. This has been possible for GANDHI TUBES because of German Technology. "
At Gandhi Tubes Prime quality Raw Material, excellent process control and Bright Annealing in Roller Hearth Furnace under closely controlled Reducing Atmosphere ensures Highly reliable, Bright, Scale-Free & ductile tubes meeting requirements of critical application like Hydraulics.
Salient features of Gandhi Tubes:
• Tubes are Bright Annealed above upper Critical Transformation Temperature (Above 900 deg. Centigrade) resulting in scale-free, bright, soft and ductile tubes.
• Tubes manufactured out of fully Aluminium Killed steel resistant to ageing for greater reliability.
• Tubes can be supplied with closer dimensional tolerances than allowed by various specifications & standards.
• Quality system certified as per ISO 9001:2008 for Non Auto Customers
• Quality system certified as per ISO/TS 16949:2009 for Auto Customers
• Plant & product approved by DNV for marine applications.

Gandhi Tubes Other Tubes
Raw Material
Prime Quality raw material from leading European Mill. Raw Material is out of Fully Aluminium Killed steel to ensure resistance to ageing & fine grain structure required for High Degree of reliability Cheap raw material with less reliability. Generally carbon content in raw material is very high resulting in hard tubes prone to cracking while forming operations like bending/flaring etc.
 Plant & Machinery
Project setup in Technical collaboration with M/s Benteler of Germany with state of art plant. Critical equipments imported from Germany. Improper Technology & inadequate manufacturing facility.
 Annealing / Normalizing
As per the specifications En 10305-1+N (NBK as per DIN 2391) the normalizing of he tubes should be done above upper critical transformation temperature i.e. above 880 deg. Centigrade. Tubes at Gandhi tubes are normalized / annealed above 900 deg. Centigrade). This results in uniformly soft and ductile tubes. Tubes are heat treated at 700 to 750 Deg. Centigrade temperature, which is the furnace temperature, actual material temperature is even less. Low temperature heat treatment is done to reduce scale. However tubes still have varying degree of scale & results in improper normalizing resulting in hard tubes prone to crack.
 Surface & Mechanical Properties
Tubes are Annealed / Normalized in Roller Hearth continuous Bright Annealing Furnace, so the tubes are consistently Bright, soft & ductile. Improper heat treatment may result in cracks. Tube surface has varying degree of scale.
Surface Roughness

Tubes are Normalized / Annealed in Bright Annealing furnace so no scale formation while annealing / normalizing. The Surface Finish of the tube is Bright & surface roughness of the tube well below 4 micron Ra value as required as per EN 10305-1 (as per DIN 2391 surface roughness required below 6.3 micron Ra value.)

Roughness values are not monitored & do not meet specification limits.
Pickling
Tubes are Bright Annealed under reducing atmosphere in imported state of the art German continuous Roller Hearth Furnace where there is no scale formation while annealing.

Tubes are absolutely bright & scale-free after annealing & they are subsequently oiled for rust prevention. Hence there is no need to pickle Tubes.

In Hydraulic System only Bright Annealed tubes are recommended.
Because of non-availability of proper Bright annealing technology tubes need to be pickled to remove rust/scale inside the tubes as scale inside tubes keep on coming out under high pressure, contaminating hydraulic oil.

However since pickling is done with acid, acid residue remains inside the tubes even after rinsing etc. This causes even more rust & contamination after some time.

In Hydraulic System, contamination is a major issue as contamination in Hydraulic oil can damage Hydraulic Pump & Valve. With recent technological upgrade to electronically controlled pumps & valves contamination in Hydraulic oil has become even more significant issue.
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