Tata Galvano

Galvano is an offering which addresses the unfulfilled need of quality – conscious customers for an authentic product delivering superior quality consistently.

‘Galvano’, as the name suggests, is Galvanized Plain (GP) steel with zero spangles. The offering is available in sheet and coil forms for all customer segments like white goods, panels, bus bodies etc. Galvano™ offers commitment to deliver high performance to meet diverse and stringent needs of the General Engineering Segment. Unlike the ordinary spangled and crushed spangled products available in the market, Galvano is a truly ‘zero spangled’ product with unmatched surface finish and mechanical properties.

Galvano is environmentally safe and economically advantageous. Coating mass on steel and severity of environment to which it is exposed play an important role in deciding the life of Galvanized Steel. While assessing the life of galvanized steel it is important that one takes into consideration the White Rust and Red Rust Resistance aspects of the products.

Special Features

Consistent Thickness

Galvano comes in uniform and close tolerance of thickness which ensures higher yield in and applications meaning more number of parts per kg compared to ordinary Galvanised products. AGC (Automatic Gauge Control) in state-of-art Picking Line and Tandem Cold Rolling Mill helps in producing steel substrate with uniform thickness at close tolerance.

Superior Surface Finish & Absolute Flatness

Uniform texture and superior flatness in Galvano ensures better finish of the end-products. Tandem Cold Rolling Mill equipped with Universal Crown, Auto Shape Control, Electro Discharge Texturing machine, 4Hi Skinpass Mill & 6Hi Tension Leveller combined ensure best-in-class surface texture and flatness thereby offering better and product finish.

Highest Corrosion Resistance

Galvano offers superior corrosion resistance and ensures that the end products manufactured from it not only meet but exceed their life expectancy. Higher chrome passivation ensures better White Rust resistance than ordinary Galvanised Products. Zero spangles coupled with skinpassing and uniform zinc coating ensure highest corrosion resistance.

Company White rust resistance Red rust resistance
Tata Steel 100 – 120 hrs 500 – 700 hrs
Others 60 – 100 hrs 400 – 600 hrs
Based on 275 gsm coating as per ASTMB 117
Uniform & Superior Zinc Adhesion

Uniform and superior zinc adhesion in Galvano prevents zinc peel-off & crazing (pebby surface) during fabrication thereby ensuring end-product durability & finish. Uniform zinc coating is possible through Feed-Forward X-ray mechanism in Continuous Galvanising Line – a mechanism unique to Tata Steel. Superior zinc adhesion is achieved through superior Aluminum control in coating bath Chemistry and Electrolytic cleaning of steel substrate before coating as compared to conventional alkali cleaning. Bend Test for Zinc adhesion is conducted as per ASTM A653, ASTM B571, EN 10327 & JIS 3302.

Optimum Formability

Galvano is made from steel substrate passed through close control of chemical composition and best mechanical properties – the key for forming applications. Superior quality of substrate is achieved by applying close controls on process parameters right from raw material (Iron Ore & Coal) stage to steel production ensuring desired quality right from Commercial to IF grades of steel. Special oils are provided on certain grades of steel for superior stampability.

Superior Paint Adhesion

Galvano comes with true zero – spangled surface ensuring best surface finish in painting applications compared to the finish offered by ordinary spangled and crushed spangled GP. True zero-spangled surface with ‘Ra’ varying between 0.8-1.6 ensures superior paint adhesion, lower paint consumption and better end product finish.

Eco-friendly

Galvano produced through ‘Lead-Free’ coating Chemistry making it an Eco-Friendly steel. Unlike ordinary Galvanised steel, Galvano does not need additional lead in its bath Chemistry making it a safe product and ROHS compliant. Tata Steel Limited also offers Trivalent Chrome passivation on customer demand.

Grades & TDCs

Segment TDC Grade Coating Mass (gsm) Skinpassed Tension Leveled
Panel GLP 1
GLP 2
GLP 3
DQ
DQ
DQ
80
120
275
YES
YES
YES
YES
YES
YES
General Engineering GLG 1
GLG 2
GLG 3
GLG 4
GLG 5
DQ
DQ
DDQ
EDD/IF
EDD/IF
80
120
120
80
120
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Appliances GLA 1
GLA 2
GLA 3
DQ
DDQ
EDD/IF
120
120
120
YES
YES
YES
YES
YES
YES
Bus Bodies GLB 1 DQ 120 YES YES

Mechanical Properties

Segment TDC Yield Strength(MPa) Tensile Strength (MPa) Elongation(%) Harness (HRB) Ra(Microns)
    Min-Max Max Min    
Panel GLP 1
GLP 2
GLP 3
250-350
250-350
250-350
410
410
410
32
32
32
55-65
55-65
55-65
0.8-1.6
0.8-1.6
0.8-1.6
General Engineering GLG 1
GLG 2
GLG 3
GLG 4
GLG 5
250-350
250-350
270(max)
190(max)
190(max)
410
410
360
330
330
32
32
35
38
38
55-65
55-65
60(max)
45(max)
45(max)
0.8-1.6
0.8-1.6
0.8-1.6
0.8-1.6
0.8-1.6
Appliances GLA 1
GLA 2
GLA 3
250-350
270(max)
190(max)
410
360
330
32
35
38
55-65
60(max)
45(max)
0.8-1.6
0.8-1.6
0.8-1.6
Bus Bodies GLB 1 250-350 410 32 55-65 0.8-1.6

Chemical Properties

  TDC % C (max) %Mn (max) %P(max) %S(max) %Si(max) %AL(min) %Micro Alloying
Panels GLP 1
GLP 2
GLP 3
0.1
0.1
0.1
0.5
0.5
0.5
0.03
0.03
0.03
0.03
0.03
0.03
0.04
0.04
0.04
0.02
0.02
0.02
NA
NA
NA
General Engineering GLG 1
GLG 2
GLG 3
GLG 4
GLG 5
0.1
0.1
0.05
0.1
0.1
0.5
0.5
0.3
0.2
0.2
0.03
0.03
0.025
0.02
0.02
0.03
0.03
0.02
0.02
0.02
0.04
0.04
0.025
0.02
0.02
0.02
0.02
0.02
0.02
0.02
NA
NA
NA
0.15
0.15
Appliances GLA 1
GLA 2
GLA 3
0.1
0.05
0.01
0.5
0.3
0.2
0.03
0.025
0.02
0.03
0.02
0.02
0.04
0.025
0.02
0.02
0.02
0.02
NA
NA
0.15
Bus Bodies GLB 1 0.1 0.5 0.3 0.03 0.04 0.02 NA

Bend Test

TDC Coasting Mass (gsm) Angel of Bend Value
GLP1 80 180° 1 t
GLP2 120 180° 1 t
GLP3 275 180° 1 t
GLA1 120 180° 1 t
GLA2 120 180° 0 t
GLA3 120 180° 0 t
GLG1 80 180° 1 t
GLG2 120 180° 1 t
GLG3 120 180° 0 t
GLG4 80 181° 0 t
GLG5 120 182° 0 t
GLB1 120 180° 1 t