Tin Mill Black Plate (TMBP) is a low-carbon steel plate used as raw material for TFS (Tin-Free Steel) or ETP (Electrolytic Tin Plate) and some non-food applications. The material’s chemical composition imparts special corrosion resistance properties. It is coated with a special oil film applied using an electrostatic oiler on both sides, protecting it from environmental humidity and facilitating handling.
TMBP can be utilized for:
| TYPES OF STEEL | FEATURE |
|---|---|
| D | Aluminum killed steel (deoxidized). This is used for deep drawn cans (two-piece cans, aerosol, etc.) or in those processes where wrinkles –de Luders– are likely to appear during machining. |
| L | Contains small quantities of metalloids and residual elements such as: Cu, Ni, Cr, Mo. Used to improve the internal corrosion resistance of cans for certain food products. |
| MR | Contains low percentages of residual elements and has a good corrosion resistance. It is the most common in the market and is used for general purposes, including cans. |
| CHEMICAL COMPOSITION FOR STEEL USED FOR ETP | |||
|---|---|---|---|
| Elemental | Type D % max | Type L (1) % max | Type MR (1) % max |
| Carbon | 0.12 | 0.13 | 0.13 |
| Manganese | 0.60 | 0.60 | 0.60 |
| Phosphorus | 0.02 | 0.015 | 0.02 |
| Sulfur | 0.05 | 0.05 | 0.05 |
| Silicon(2) | 0.02 | 0.02 | 0.02 |
| Copper | 0.20 | 0.06 | 0.20 |
| Nickel | 0.15 | 0.04 | 0.15 |
| Chromium | 0.10 | 0.06 | 0.10 |
| Molybdenum | 0.05 | 0.05 | 0.05 |
| Others, each | 0.02 | 0.02 | 0.02 |
According to ASTM A623-2009. (1) Double reduction products are obtained in type L and MR. (2) When it is used steel obtained by continuous casting killed by silicon it is accepted until 0.08%
| ETP FINISHED | ||
|---|---|---|
| TYPE | MAIN USES | FEATURES |
| BRIGHT | General purpose cans | Finishing with melted tin, with a bright shine |
| MATE | Crown caps | Matte finish, without shine, with electrolytically deposited tin without melting on the matte finishes steel plate |
| SILVER | Cans for different applications, crown caps | Finish with melted tin produced using a special treatment on the base metal |
| STONE | General use cans | Finish with melted tin, produced on the base metal, with a slightly matte appearance. Resists scratching during lithography or can production. |
| TEMPER | Hardness, HR30T | Thickness: e, mm |
Uses |
|---|---|---|---|
| T1-BA | Max 53 | e<0,21 | Necks, nozzles, taps, toys bottoms for 5 gal. cans for oil and other uses that require deep drawing. |
| Max 52 | 0,21<=e<=0,28 | ||
| Max 51 | e>0,28 | ||
| T2-BA | 53 ± 4 | e<0,21 | Small, square cans, cans for fish (0) salted meat, rings and other uses, with moderate draw. |
| 52 ± 4 | 0,21<=e<=0,28 | ||
| 51 ± 4 | e>0,28 | ||
| T2,5 – BA, CA | 56 ± 4 | e<0,21 | Crowns, for cans and other applications that require moderate draw and hardness. |
| 55 ± 4 | 0,21<=e<=0,28 | ||
| 54 ± 4 | e>0,28 | ||
| T3 – BA, CA | 58 ± 4 | e<0,21 | Bodies for 5 gal oil cans, large cans and other applications that require an appropriate level of hardness. |
| 57 ± 4 | 0,21<=e<=0,28 | ||
| 56 ± 4 | e>0,28 | ||
| T4 – C4 (1) | 62 ± 4 | e<0,21 | Bodies and bottoms for cans that require relatively high strength, and crown caps. |
| 61 ± 4 | 0,21<=e<=0,28 | ||
| 60 ± 4 | e>0,28 | ||
| T5 – CA (1) | 65 ± 4 | e<0,21 | Bodies and bottoms for cans that require a combination of high hardness, strength, and good formability. |
| 65 ± 4 | 0,21<=e<=0,28 | ||
| 64 ± 4 | e>0,28 | ||
| DR 7,5 | 70 ± 4 | e<0,21 | Bodies and bottoms of small diameter cans require high strength. |
| 70 ± 4 | 0,21<=e<=0,28 | ||
| 70 ± 4 | e>0,28 | ||
| DR 8(2) BA – CA | 73 ± 4 | e<0,21 | |
| 73 ± 4 | 0,21<=e<=0,28 | ||
| 73 ± 4 | e>0,28 | ||
| DR 9(2) CA | 76 ± 4 | e<0,21 | |
| 76 ± 4 | 0,21<=e<=0,28 | ||
| 76 ± 4 | e>0,28 | ||
| DR 9 M (2) | 77 ± 4 | e<0,21 | |
| 77 ± 4 | 0,21<=e<=0,28 | ||
| 77 ± 4 | e>0,28 | ||
| DR 10 | 80 ± 4 | e<0,21 | |
| 80 ± 4 | 0,21<=e<=0,28 | ||
| 80 ± 4 | e>0,28 |
(1) CA means continuous annealing and BA means box annealing. (2) DR: Base metal produced using the double cold reduction process; provides greater stiffness and strength than conventional base material and, therefore, provides the same strength using smaller cross sections. These advantages make it possible to produce more cans per unit weight. Service characteristic, thickness distribution and chemical characteristics are similar to those of conventional steel.
| DIMENSIONS AVAILABILITY | |||
|---|---|---|---|
| Variable | Units | Minimum | Maximum |
| 3.4.1. MECHANICAL PROPERTIES AND COATINGS | |||
| Thickness | mm | 0,15 | 0,6 |
| Temper | N/A | T1 | DR10 |
| Oil | mg/m2 | 0 | 25 |
| 3.4.2. PACKAGES PRESENTATION | |||
| Rectangular cutting sheets | |||
| Cutting length | mm | 457,2 | 1250 |
| Width | mm | 600 | 965,2 |
| Package weight | Kg | N/A | 2500 |
| Package height | mm | N/A | 450 |
| Pre-scroll cutting sheets | |||
| Thickness | mm | 0,13(1) | 0,50 |
| Cutting length | mm | 610 | 1016 |
| Width | mm | 610 | 1118 |
| Package weight | Kg | N/A | 2500 |
| Package height | mm | N/A | 457,2 |
| Rectangular re-squared cutting sheets | |||
| Thickness | mm | 0,13(1) | 0,40 |
| Width | mm | 600 | 1000 |
| Cutting length | mm | 500 | 1000 |
| Package weight | Kg | N/A | 2500 |
| Package height | mm | N/A | 450 |
| Lithographed sheets (Press) | |||
| Width | mm | 710 | 1130 |
| Length | mm | 510 | 960 |
| Maximum printing area | mm | 1130 (Width) | 945 (Length) |
| Package weight | Kg | N/A | 2500 |
| Package height | mm | N/A | 450 |
| Varnished sheets | |||
| Width | mm | 710 | 1130 |
| Length | mm | 510 | 960 |
| Maximum printing area | mm | 1130 (Width) | 970 (Length) |
| Package weight | Kg | N/A | 2500 |
| Package height | mm | N/A | 450 |
| 3.4.3 COILS PRESENTATION | |||
| 3.1 Coils | |||
| Coil weight | Kg | 1000 | 9000 |
| Internal diameter | mm | 419 | 505 |
| External diameter | mm | 610 | 1626 |
| Strips | |||
| Thickness | mm | 0,17 | 0,6 |
| Coil width | mm | 600 | 984 |
| Strip width | mm | 20 | 614 |
| Strips by step | Units | 2 | 15 |
| Coil weight | Kg | 1000 | 9000 |
| Internal diameter | mm | 505 | —— |
| External diameter | mm | 610 | 1624 |
RECOMMENDATIONS AND PRODUCT HANDLING.
For maximum usage of the raw material, the following recommendations should be followed:
The Tin Mill Black Plate (TMBP) should be stored in a humidity-free environment to prevent risk of oxidation.
Oxidation is the result of the interaction among the iron, exposed through imperfections in the coating, water (humidity), and oxygen in the air.
To prevent oxidation, it is necessary to take care when transporting, storing, and handling the TMBP by following these precautions:
Demand appropriate transportation, with vehicles that have floors and roofs in good condition.
Inspect one hundred percent of each production order to check the general status of the packaging.
Never leave the TMBP outdoors.
Store the TMBP in closed warehouses with low relative humidity. In coastal areas or areas with lots of rainfall, it is advisable to use equipment to reduce relative humidity to acceptable levels.
Do not store TMBP without appropriate packaging.
Do not make piles higher than 2.50 m.
Never handle TMBP without gloves. The humidity and salts in perspiration attack TMBP very quickly.
If the TMBP bales must be inspected, they should be covered again for storage. If humidity is seen during inspection, it is advisable to use that TMBP immediately to prevent the oxidation process.
Use TMBP immediately after opening it.
In production processes that use TMBP and require cuts, the resulting parts should not be stored for a long time because the edges do not contain tin and become quickly oxidized.
Special care should be taken in handling and fabrication of cans and caps to avoid scratching the TMBP. Do not store the TMBP for very long because the oil applied to protect it evaporates and breaks down until it disappears.
Material storage should be as follows:
In general, the lots with greater area or quantity should be located in the stack’s lower side.
Stock height should be necessary enough to keep visual control to avoid injuries. Moreover, stability due to the base/height and floor capacity resistance should be considered.
Do not rub the TMBP with abrasive material or use inorganic liquids to clean it. Use cotton and a solvent compatible with the lacquer or ink that is going to be used.
Note: Sheets with thickness less than 0.15 mm are provided by the customer.
1 Sheets with thickness less than 0.15 mm are provided by the customer.
| Rectangular re-squared cutting sheets | |||
|---|---|---|---|
| Thickness | mm | 0,13(1) | 0,40 |
| Width | mm | 600 | 1000 |
| Cutting length | mm | 500 | 1000 |
| Package weight | Kg | N/A | 2500 |
| Package height | mm | N/A | 450 |
| Lithographed sheets (Press) | |||
| Width | mm | 710 | 1130 |
| Length | mm | 510 | 960 |
| Maximum printing area | mm | 1130 (Width) | 945 (Length) |
| Package weight | Kg | N/A | 2500 |
| Package height | mm | N/A | 450 |
| Varnished sheets | |||
| Width | mm | 710 | 1130 |
| Length | mm | 510 | 960 |
| Maximum printing area | mm | 1130 (Width) | 970 (Length) |
| Package weight | Kg | N/A | 2500 |
| Package height | mm | N/A | 450 |
| 3.4.3 COILS PRESENTATION | |||
| 3.1 Coils | |||
| Coil weight | Kg | 1000 | 9000 |
| Internal diameter | mm | 419 | 505 |
| External diameter | mm | 610 | 1626 |
For more detailed technical information or to discuss your specific requirements, reach out to our expert team.
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