Hot-Dip Galvanizing Steel
The zinc tank is operated with the unleaded zinc bath to respond to the demand of environmen-
tal protection. Because it is designed with a mass volume (230 tons),the temperature and the
chemical composition of the zinc bath can be controlled steadily.With the most innovative Roll-
Coating equipment, post treatment can be done with different mixes of chemical reagents at the
customers' requests, and this can also meet the demand of environmental protection in waste
reduction.
Generally, GI is not galvannealed and is mainly used in applications such as a base metal
for making color steels, constructional materials, computer cases, furniture,slip rails, wind
tubes, etc. GA is galvannealed after the process of Zinc Pot Galvanizing is finished, and can
be made into general structural steel, or high strength steel. It can also be made to possess
the property for deep drawing use and can also be applied in making the "bake-harden" type of
products depending on the customers' working or forming demands. It is mainly used in manufa-
cturing car bodies and appliance parts, etc. The thickness of the zinc coating, which can be
made according to the customers' requests, together with the suitable chemical treatment
(e.g. chromate coating treatment, or anti-finger print treatment), enables hot-dip galvanized
and galvannealed steel coils to become truly diversified products with excellent quality.
| Hot-Dip Galvanizing Steel |
| (1) JIS G3302 |
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| Classified symbol | Tensile strength | Yield point | Elongation ％ ( min.) | Test piece and direction of tensile test |
| N/mm 2 (min.) | N/mm 2 |
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| (Min.) |
| Nominal thickness mm (t) | Nominal thickness mm (t) | Nominal thickness mm (t) |
| 0.30 ≦ | 0.30 ≦ | 0.30 ≦ | 0.40 ≦ | 0.60 ≦ | 1.00 ≦ | 1.60 ≦ |
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| t< 2.30 | t< 2.30 | t<0.40 | t<0.60 | t<1.00 | t<1.60 | t<2.30 |
| Mild steel | SGCC | 270 | － | － | － | － | － | － | JIS No.5 |
| SGCD1 | － | － | 34 | 36 | 37 | 38 |
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| SGCD2 | － | － | 36 | 38 | 39 | 40 | In rolling direction |
| SGCD3 | － | － | 38 | 40 | 41 | 42 |
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| Commercial steel | SGC340 | 340 | 245 | 20 | 20 | 20 | 20 | 20 |
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| SGC400 | 400 | 295 | 18 | 18 | 18 | 18 | 18 |
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| SGC440 | 440 | 335 | 18 | 18 | 18 | 18 | 18 |
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| (2) GW590Y |
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| Classified symbol | Tensile strength | Yield point | Elongation ％ | Test piece and direction of tensile test |
| N/mm 2 | N/mm 2 |
| Nominal thickness mm (t) | Nominal thickness mm (t) | Nominal thickness mm (t) |
| 0.40 ≦ | 0.40 ≦ | 0.80 ≦ | 1.00 ≦ | 0.40 ≦ | 0.60≦ | 0.80≦ | 1.00≦ | 1.20≦ |
| t <2.40 | t < 0.80 | t < 1.00 | t < 2.40 | t<0.60 | t < 0.80 | t<1.00 | t<1.20 | t<1.60 |
| 590~670 | 325~430 | 315~420 | 305~410 | － | 16~32 | 21~33 | 22~34 | 23~35 | JIS No.5 |
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| GW590Y | In rolling direction |
