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Tinplate (ETP)

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Tinplate is applied mainly as a canned storage for food and beverages, artistic products, paints, electronic parts etc., featuring beautiful silvery gloss from tin, great corrosion resistance and eco-friendly characteristics. Tinplate is used in various applications because it is excellent in weldability, paintability, printability, and preservability and it is harmless to human body.

Application

F&B Storage / Aerosol / General Cans / Paint Cans 14L, 18L / Electronic Components

Schematic Image

Product Specification

Product Standard Code

Standard KS ASTM JIS EN
Code D 3516 ET A 624 G 3303 SPTE 10202

Coating Weight (unit : g/m²)

Symbol Nominal Coating weight Minimum Average Coating Weight Minimum Coating Weight of 1point
1.0 (#10) 1.0 0.85 0.75
1.5 (#15) 1.5 1.35 1.20
2.0 (#20) 2.0 1.80 1.70
2.8 (#25) 2.8 2.45 2.25
5.6 (#50) 5.6 5.25 4.99
8.4 (#75) 8.4 7.85 7.46
11.2 (#100) 11.2 10.10 9.60

Oil Weight (unit : mg/m²)

Symbol Aim Application
D - 1 4.5 Printing, Lacquering
D - 2 8.0 For Plain
D - 3 12.5 For Plain
D - 4 Max 20 Special Usage

Chemical Treatment (unit : mg/m²)

Symbol Treatment Aim Application
None None None 2-Piece Can
300 Sodium Dichromate Dip 1.6 Food Can(Mushroom)
311 Cathodic Sodium Dichromate Low Coulombs 4.0 General Can, Food/Beverage Can
314 Cathodic Sodium Dichromate High Coulombs 10.0 Special Usage

Raw Material Information

BP Standard Code

Code KS ASTM JIS EN
Code D 3516 SPB A 625 SPB 10202

Classification

① Classification by Type of Steel

Type of Steel Remark
MR (Medium Residual) It contains few residual minor constituents and it is widely used for applications such as containers.
L (Low Metalloid Steel) It contains particularly few residual minor constituents such as Cu, Ni, Cr, Mo, so that it is suitable for the materials of containers required improved corrosion resistance.
D (Drawing) It is aluminum killed steel, so that it is suitable for the applications, which bear deep drawing, or other working that is liable to produce Luder’s lines pattern.

② Classification by Temper

The temper grade of SR(Single Reduced) BP(Black Plate) shall be expressed by the Rockwell superficial hardness values(HR30Tm)

Symbol t ≤ 0.21mm 0.21mm < t ≤ 0.28mm t > 0.28mm Remark
T50 T1 ≤53 ≤52 ≤51 Deep Drawing, Aerosol
T52 T2 53 ± 4 52 ± 4 51 ± 4 Battery Case
T55 T2.5 56 ± 4 55 ± 4 54 ± 4 18L Liquid
T57 T3 58 ± 4 57 ± 4 56 ± 4 General Can
T61 T4 62 ± 4 61 ± 4 60 ± 4 General Can, Crown
T65 T5 65 ± 4 65 ± 4 64 ± 4 Food Can Top/End

The hardness of less than 0.21mm in nominal thickness is normally tested using Rockwell 15T scale and results converted to Rockwell 30T scale.

- The temper grade of DR(Double Reduced) BP(Black Plate) shall be expressed by the Rockwell superficial hardness values(HR30Tm) or 0.2% average Yield Strength.

Symbol Average Rockwell superficial hardness 0.2% average Yield Strength Remark
DR450 68 ± 4 450 ± 70 Aerosol, Food Beverage Can
DR520 72 ± 4 520 ± 70 Aerosol, Food Beverage Can
DR550 73 ± 4 550 ± 70 Aerosol, Food Beverage Can
DR580 74 ± 4 580 ± 70 DRD, Food Beverage Can
DR620 76 ± 4 620 ± 70 DRD, Food Beverage Can

③ Classification by Surface Finish

Product Designation Symbol Remark Aim
(Ra/㎛)
KS/JIS TCC
SR Bright Finish B BF Blackplate finished to have a smooth surface with the use of temper-mill work rolls that have been ground to a low roughness 0.20~0.40
Stone Finish R Rx Blackplate finished to have a directional pattern with the use of final-mill work rolls that have been ground to a higher level of roughness than those used for the bright finish 0.38~0.58
Silver Finish S D7 Blackplate finished to have a dull surface with the use of temper-mill work rolls with dull surface texture(Tinplage with a luster finish provided by a flow-melted tin coating) 0.70~1.30
Matt finish M D7 Blackplate finished to have a dull surface with the use of temper-mill work rolls with dull surface texture(Tinplage with a luster finish provided by a flow-unmelted tin coating) 0.70~1.30
DR Stone Finish R Rd Blackplate finished to have a directional pattern with the use of final-mill work rolls that have been ground to a higher level of roughness than those used for the bright finish 0.25~0.45