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What is EN 10203?
EN 10203 is European Standard specifies reguirements for single and double cold reduced low carbon mild steel electrolytic tinplate in the form of sheets or coils for subsequent cutting into sheets.
In case of any conflict in requirements, the requirements of the purchase order, the individual material specification, and this general specification shall prevail in the sequence named.
EN 10203 Equivalent of Electrolytic Tinplate Sheet and Electrolytic Chromium-Coated Steel
Chinese standard: GBT 2520
American standard: ASTM A623M
Japanese Industrial Standard standard: JIS G3303
Definitions Of EN 10203
electrolytic tinplate low carbon mild steel sheet or coil coated on both surfaces with tin that is applied in continuous electrolytic operation
differentialy coated electrolytic tinplate
cold reduced electrolytic tinplate, one surface of which carries a heavier tin coating than the other.
single cold reduced
a term used to describe those products where the steel substrate has been reduced to the desired thickness in a cold reduction mill and subsequently annealed and temper rolled
double cold reduced
a term used to describe those products in which the steel base has had a second major reduction after annealing
batch(box)annealed(BA)
annealed by the process in which the cold reduced strip is annealed in tight coil form, within a protectiveatmosphere,for a predetermined time-temperature cycle
continuously annealeo(CA)
annealed by the process in which cold reduced coils are unwound and annealed in strip form within a protective atmosphere
Surface finish
the surface appearance of tinplate is determined by the surface characteristics of the steel base together with the condition of the tin coating which can be either flow-melted or unflow-melted.
EN 10203 Surface Treatment
Classification of surface finishes for electrolytic tinplate
| Commodity | Letter Symbol | Classification | Specific Feature |
| Single cold-reduced products | B | Bright finish | A luster surface provided by a flow-brightened tin coating on a smoothly grindstone-finished steel base. |
| R | Stone finish | A luster surface provided by a flow-brightened tin coating on a steel base characterized by a directional grindstone-pattern. | |
| S | Silver finish | A luster surface provided by a flow-brightened tin coating on a coarse dull finished steel base. |
Surface Finish Classification Of Blackplate
| Single cold-reduced products | B | Bright finish | A smooth surface finish with a fine grindstone-pattern |
| R | Stone finish | A surface finish with a directional grindstone-pattern | |
| M | Matte finish | A dull surface finish | |
| Double cold-reduced products | R | Stone finish | A surface finish with a directional grindstone-pattern |
EN 10203 Steel Grade
| Type of steel | Remark |
| MR | It contains few residual minor constituents and has a good corrosion resistance so that it is widely used for such applications as containers. |
| L | 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 | It is aluminium 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. |
Tin coating Mass of EN 10203
The coating mass, on each surface, shall be expressed in grams per square meter (g/m”). The lowest values specified in this standard shall be 1 g/m2 on each surface, no upper limit is specified. Values of preferred coating masses are 1,0,1,5,2,0,2,8,4,0,5,0,5,6, 8,4 and 11,2 g/m2.
Designation of standard tin coating mass and its minimum average coating mass
| Electrolytic Tinplate Sheet | ||
| Type of coating | Equally coated | Differentially coated |
| Designation of coating weight (g/m2) | 2.8/2.8 | 5.6/2.8 |
| 5.6/5.6 | 8.4/2.8 | |
| 8.4/8.4 | 8.4/5.6 | |
| 11.2/11.2 | 11.2/2.8 | |
| 11.2/5.6 | ||
| 11.2/8.4 | ||
| Nominal coating weight (g/m2) | 2.8/2.8 | 5.6/2.8 |
| 5.6/5.6 | 8.4/2.8 | |
| 8.4/8.4 | 8.4/5.6 | |
| 11.2/11.2 | 11.2/2.8 | |
| 11.2/5.6 | ||
| 11.2/8.4 | ||
| Minimum average coating weight (g/m2) | 2.45/2.45 | 5.05/2.45 |
| 5.05/5.05 | 7.55/2.45 | |
| 7.55/7.55 | 7.55/5.05 | |
| 10.1/10.1 | 10.1/2.45 | |
| 10.1/5.05 | ||
| 10.1/7.55 | ||
Temper Grade of EN10203
For the purposes of this standard single reduced tinplate is classified into temper grades based on the Rockwell 30 Tm hardness values and double reduced tinplate classification is based on the 0,2 % proofstress properties and Rockwell 30 ‘Tm hardness values.Other mechanical properties will significantly influence the performance of tinplate in processing andsubsequent intended end use and will vary depending on the steel type and the methods of casting, annealing and temper rolling employed.
Temper Designation Of Single Cold-Reduced Product
| Temper Designation | Traget, Rockwell hardness HR30T |
| T-1 | 49+3 |
| T-2 | 53+3 |
| T-2.5 | 55+3 |
| T-3 | 57+3 |
| T-4 | 61+3 |
| T-5 | 65+3 |
| T-6 | 70+3 |
Temper grades for double cold-reduced tinplate and black plate shall be expressed in Rockwell superficial hardness (HR30T).
en 10203 Temper Designation Of Double Cold-Reduced Product
| Temper Designation | Target, Rockwell Hardness | Target, proof stress (information only) parallel to rolling direction |
| HR30T | N/mm2 | |
| DR-8 | 72 | 550 |
| DR-9 | 75 | 620 |
| DR-9M | 76 | 660 |
| DR-10 | 79 | 690 |
The above is a display of the main parameters in the EN 10203 production standard. I hope it can help you better understand Tinplate. If you are looking for a Tinplate supplier, we hope you can contact us to give you a quote. If you need to find other suppliers, we are happy to help you.
