All tinplate originates in the steel making furnace, where the proper chemistry for steel is obtained to meet the specific needs for the end user. All tin mill products start their production process in a basic oxygen furnace. This highly productive process uses a mixture of recycled steel scrap (25 to 30 percent) and liquid iron (70 to 75 percent) to make high quality, new steels, including tinplate.
Continuous Casting
Once steel is produced, the continuous process transforms molten steel into slabs in one continuous operation. Continuous casting is a highly energy- and cost-efficient process that produces a slab of excellent quality and consistency.
Blackplate
Blackplate is not actually black, but the surface qualities of blackplate steels are the same as cold-rolled steels that have not been coated. Blackplate is easily painted or plated for corrosion protection and appearance and can be easily bonded and welded. Blackplate is most commonly used for items such as toys, serving trays, building materials, household goods, closures and caps.
Electrolytic Tin Coating
The unique properties of tin provide a coating on the steel that protects the contents, while providing the steel with an attractive appearance, corrosion resistance and ease in bonding, welding and painting. Tin is applied to both sides of the blackplate coil through an electrolytic process at speeds up to 2,000 feet per minute. The thickness of the tin coating (called coating weight) is dependent upon the end use application. Typical applications for electrolytic tinplate include food and beverage containers, paint trays, battery tops and paint, varnish and aerosol cans.
APPLICATION :
Tinplate is used worldwide in the manufacture of cans for food, beverage and general line (chemical or technical) products.
o Cans for human food, pet food, beverage
o Specialty and promotional packaging
o Paint cans
o Aerosol cans
o MORE
Standard
|
JP |
US |
TW |
|
|
JIS G3303 |
ASTM 624/626 |
CNS G3097 |
DIMENSION :
|
ITEM |
Thickness mm |
Width mm |
Length mm |
Weight MT |
Inside Dia. mm |
|
SHEETS |
0.15 ~ 0.60 |
700 ~ 970 |
508 ~ 1050 |
|
|
|
COILS |
0.15 ~ 0.60 |
700 ~ 970 |
|
5 ~ 12 |
406 / 508 |
STEEL TYPE :
|
|
Characteristics |
|
MR |
it contains few residual minor constituents and has a good corrosion resistance so that it is widely used for each application as containers. |
|
L |
it contains particularly few residual minor constituents such as Cu, Ni, Cr, Mo, so that it is suitable for the material of containers required improved corrosion resistance. |
|
R |
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 Lude's lines. |
TEMPER DESIGNATION :
The temper designation gives a guide to the hardness (and stiffness) of products.
For Single Reduced products, the softer tempers are normally produced from Batch Annealed (BA) feed, while the harder tempers are offered only from Continuous Annealed (CA) feed.
Continuous Annealed (CA) products normally have more consistent mechanical properties throughout the length of coil than Batch Annealed (BA), due to the nature of the process involed.
|
Designation |
HR-30T Aim |
Example of Usage |
|
|
Single Reduced |
T1BA |
49 ± 3 |
soft for deep drawing |
|
T2BA |
53 ± 3 |
moderate drawing |
|
|
T2.5BA |
55 ± 3 |
pressings and general cans, available on enquiry |
|
|
T3BA |
57 ± 3 |
general purpose |
|
|
T4CA |
61 ± 3 |
moderate forming, fair degree of stiffness |
|
|
T5CA |
65 ± 3 |
increased stiffness to resist bucking |
|
|
Double Reduced |
DR-8 |
73 ± 3 |
small diameter round can bodies and ends |
|
DR-9 |
76 ± 3 |
large diameter round can bodies and ends |
|
|
DR-9M |
77 ± 3 |
beer and carbonated beverage ends |
|
|
DR-10 |
80 ± 3 |
beer and carbonated beverage ends |
|
Notice :
1. the suffix CA means Continuous Anneal. The CA tinplate has superior features due to the greater rigidity, high corrosion resistance and uniformity of mechanical properties and is idea for speedy can making.
2. DR : base metal produced by the double cold reduction process -- the base metal has received a second major cold reduction following annealing. Consequently, it offers greater rigidity and strength than conventional base metal.
3. Both CA and DR tinplate has the property of mechanical direction. It is necessary to have the rolling direction of tinplate parallel with the can circle.