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Tin Free Steel (TFS)

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TFS electrolyzes cold-rolled steel to chromic acid to form a double film of metal chrome and chrome oxide. TFS features outstanding adhesion, printability and processability, and is durable against extreme external changes such as heat and sulfur. It is mainly used for tuna cans and bottle caps.

Application

F&B Storage / Lug Caps / Bottle Caps / Paint Cans 14L, 18L

Schematic Image

Product Specification

Product Standard Code

Standard KS ASTM JIS EN
Code D 3614 SPTFS A657 G 3315 SPTFS 10202

Coating Weight (unit : mg/m²)

Symbol Metal Chrome Oxide Chrome Remark
Coating Range(m²) ≥30 ≥5

Oil Weight (unit : mg/m²)

Symbol Aim Remark
D - 1 4.5 Printing, Lacquering

Raw Material Information

BP Standard Code

Standard 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(Electrolytic tinplate 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(Electrolytic tinplate 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