Single Reduced Tinplates

Tailor-made within the following ranges:

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Coating Grades

Single Reduced Electrolytic Tinplate is available either equally coated or differentially coated in the following grades

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Open Top Sanitary Cans (OTSC)

TCIL pioneered the introduction of OTS Tinplate years ago, and continues to be the domestic source for the entire range of OTS products be it A10, A12, A2½, No.1 Tall and many others, matching both industry and customers' specification. Certified by CFTRI, a leading research centre in food technology, TCIL has emerged to be a major supplier of Tinplates for OTS products, a differentially coated ETP, available in both Single/Double reduced forms, ideally suited for packaging processed food like mango pulp, baked beans, pineapple rings, fruits and juices, mushroom, fish, meat, prawns etc.

Special Properties

ISV = 20 micrograms max.
Tin Grain Size = ASTM 9 or less numerically.

Note: Above coating properties are guaranteed on the heavier coated side.

Tolerances in coating weights are the same as given for Single Reduced Tinplates.

As per BIS specification (IS 1993: 1993) the marking system consists of parallel lines about one mm wide, the distance between the lines indicating the coating masses. Coating-wise line spacing given on Tinplate sheets is given below:

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Tin Free Steel

Post-liberalization days have witnessed a boom especially in the soft drinks and beer markets in India. Backward integration of our TFS line with the Cold Rolling Mill and TATA STEEL's Hot Strip Mill has given us the advantage to cater to a wide spectrum of superior quality TFS requirement of the market.

Tin Free Steel is an electrolytic chrome plated steel consisting of a thin layer of chromium and a layer of chromium oxide deposited on the steel base which gives it a beautiful, lustrous metallic finish on both sides. TFS offers outstanding corrosion resistance, lacquer adhesion as well as printability. No wonder it's an economical and high quality replacement for Tinplate, especially for the screw and crown cap market. Tin Free Steel (single/double reduced) is available in the same range of dimensions/ temper/ mechanical properties and oil film.

Additional features of TFS

Filiform rust resistance - The filiform rust progressing as a filament externally beneath the enamel from scratches and similar defects under atmospheric corrosion. TFS has a better under film corrosion resistance than Electrolytic Tinplate

Sulphur Blackening Resistance - The metallic chromium in TFS has excellent sulphide resistance property when canning protein-rich foodstuff. TFS compensates for the expensive sulphur resistant lacquer, which would have been necessary for ETP

Coating - Unlike ETP, the coating in TFS is not amphoteric. Alkaline products such as detergents and dispersion colours can be packed in TFS with advantage.

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Double Reduced Tinplate Sheets

As early as in 1985, TCIL initiated a project to keep pace with global developments in consultation with some of the leading Can fabricators to evaluate the suitability of Double Reduced (DR) Tinplate as the packaging material for 15 kg Cans. TCIL has set up a 2-stand DCR mill backed up by the state-of-the-art technology obtained from SMS Germany and UEC, USA for the manufacture of DR Tinplate for the first time in the country.

What are double reduced sheets?

Double Reduced material is normally thinner but stronger than conventional Single Reduced material. After an initial cold reduction and annealing instead of temper rolling, the steel is given a second cold reduction with lubrication, which gives work hardening effect and imparts additional strength to Double Reduced material.

Today TCIL is also capable of supplying excellent quality of thin strip DR for Instant Coffee packaging and other OTS products in the range of 0.17 mm, 0.19 mm and 0.21mm respectively. In fact, DR Tinplate can be a very cost effective replacement of Single Reduced Tinplate in almost all applications.

Salient Features of DR Tinplate

The salient feature of DR Tinplate is the combination of higher strength and sufficient ductility, which enables much thinner Tinplate to be used, compared to Single Reduced Tinplate resulting in Substantial economic savings.

According to the steel chemistry and annealing process, the second reduction can be between 30% and 40%, thereby producing strengths upto 700 N/mm2, whereas single reduced material has strength less than 450 N/mm2.

Soft Double Reduced Tinplate

Soft DR ETP is Double Reduced (DR48) material with temper T65+/-3 and all other parameters same as 0.19 mm/0.20 mm Single Reduced Tinplate It is produced from 2mm HR coil unlike 0.19mm/0.20mm SR material, which is produced from 1.6mm/1.8mm HR coil. The Soft DR will be available in 0.19mm/0.20mm thickness with a brighter finish compared to 0.19mm SR. For this added advantage given by the Soft DR, there is no difference in price vis-à-vis 0.19mm/0.20mm SR.

Reason for introducing Soft DR

TCIL is currently supplying .19mmxT61/0.20mm spec. ETP to its customers. This spec. is produced from 1.6mm/1.8mm HRC which is very difficult to procure reason being, yield in making 1.6mm/1.8mm HRC is very low and does not justify realization from the customer, which invariably leads to poor compliance in all sizes including 0.19mm/0.20mm T61 made from 1.6mm/1.8mm HRC at our end. To counter this problem TCIL has developed Soft DR (DR48) produced from 2mm HRC which is easily available and can be used in place of 0.19mm /0.20mm SR, only difference being its Temper is T65 which does not have any problem at the customers end for T61 application.

Soft DR is already being used by all leading fabricators in India and has been a great success with respect to its performance and compliance at our end.
Scope of Soft DR in Future

In the coming days there is going to be major problem in supplying .19mm SR tinplate as supply of corresponding 1.6mm/1.8mm HRC raw material is going to be much more scarce than before. Then Soft DR will be looked upon as the lifeguard for 0.19mm and 0.20 mm Tinplate. Therefore in the near future the Soft DR is going to witness its increasing importance and high demand.

Sizes

Double Reduced (DR) Electrolytic Tinplates are available in the same range of thickness, width, cut lengths, finish, tin coating, passivation and oil film as Single Reduced Tinplates. DR Tinplate combines the advantages of low weight and high strength.

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Passivation Film

3.5 - 6.5 mg/sq.m of chromium per side (with 311 treatment) unless otherwise specified.

Oil Film

5 -12 mg./sq.m of DOS (total for both sides).

Mechanical Properties

Double Reduced Tinplates are available in the following grades:

Typical Applications

Baby Food, Milk Poeder, Coffee Tins, 15 kg. Oil cans, etc.

DR Tinplate for Oil cans

DR Tinplate is produced for the oil can size sector in the following sizes, thickness and tempers:

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