What is Galvanized Steel?

Galvanized steel is steel that has gone through a chemical process to keep it from corroding. The steel gets coated in layers of zinc oxide because this protective metal does not get rusty as easily. The coating also gives the steel a more durable, hard to scratch finish that many people find attractive. For countless outdoor, marine, or industrial applications, galvanized steel is an essential fabrication component.

Benefits of Galvanization

Zinc protects steel in two ways. First, it is highly resistant to rust; iron, a major component of steel, reacts very easily with oxygen and moisture and will eventually disintegrate. The layer of zinc on the surface prevents those elements from reaching the steel so quickly. It also develops a patina — a layer of zinc oxides, salts, and other compounds — that offers further protection. Zinc is also extremely durable and scratch resistant, and has a satiny appearance that many find attractive.

The outer layer also protects the steel by acting as a "sacrificial layer." If, for some reason, rust does take hold on the surface of galvanized steel, the zinc will get corroded first. Even in areas where the surface is scratched or damaged, the surrounding zinc will still corrode before the steel does. The lifespan of galvanized steel varies, but industrial steel with a 3.9 mil (0.0039 inches or 0.09906 mm) thick coating can last more than 70 years without maintenance under average conditions.

Uses

Galvanized steel can be found almost everywhere. Many individuals live in steel frame houses, and buildings are often made with galvanized steel roofs. There are multiple steel parts in cars that help protect them from the weather, and it's used in many marine applications due to its ability to withstand the salt and the elements. Besides being inexpensive, durable and effective, this metal is also popular because it can be recycled and reused multiple times.

Please contact me if you need more information.

Nam Kim Steel Manufacturer

Mr. Triet Le

Mobile/Whatsapp: +84 965 047 865

Email: trietlm@namkimgroup.vn

Galvanized and Galvalume! What is the difference

What is the difference of Galvanized and Galvalume?

1. Galvanized: Surface of galvanized steel evenly distributed the layer of zinc materials, which plays the role of anodic protection for base material, that means corrosion of zinc material give the protection of the base material , and only when all the zinc coating is corroded ,can harm done to the base metal inside.

2.Galvalume: Galvalume coating surface is made from 55% aluminum, 43.5% zinc and a little amount of other elements. Galvalume coating is of a honeycomb structure under microscopic circumstance .The “honeycomb”, which is made of aluminum, contains all the zinc .In this case, the galvalume coating also plays the role of anodic protection, but with the decrease of the zinc amount, and the zinc material covered by aluminum, the anodic protection reduced greatly. So once the galvalume steel sheets are cut, the cutting edge without protection will soon be corroded. So should galvalume sheets be cut less, and zinc-rich paint or anti-rust paint applied to the cutting edge could be able to increase the life of the steel sheets.

3. The different
3.1 Surface:  The surface of galvalume sheet is more beautiful than galvanized sheet, while the galvalume sheet is more expensive than galvanized sheet, and now the customer like the small spangle than regular spangle

3.2 Corroision: In a rainy and humid city, once corrosion occurs at some point on galvalume sheet, it will spread increasingly on whole board if you do not take measures timely to slowly rust; while galvanized rust not spread if it occurs at a point.

Even a galvalume with greatest quality cannot overcome this shortcoming. Therefore, when we propose customers of the galvanized products, we will explain to customers the difference between them, if they require galvalume products, then we can only try to use corrosion paint immediately once it is cut.

Nam Kim Steel Manufacturer

Mr. Triet Le

Mobile/Whatsapp: +84 965 047 865

Email: trietlm@namkimgroup.vn

JIS G3321 - Galvalume Steel Coils - Nam Kim Steel

Nam Kim Steel Joint Stock Company
JIS G3321 - Galvalume Steel Coils     

Application of hot-dip Al-Zn coated steel sheet    
A.  Architecture
Roofs and outside walls of civilian and industrial buildings, garage doors, fencings and window blinds"     
B. Appliances Industry     
Outer clad sheets for washing machine, refrigerator, television, air conditioner and ventilation system, explosion-proof, strip, solar water heater and appliance parts     
C. Auto Industry
Muffler, heat shields of exhaust pipe and catalytic converter, auto parts & accessories under the frame, signboard in highway"     
D. Industrial Instruments     
Electric control cabinet, industrial refrigeration equipment, automatic vending machine     

Division		Contents
Thickness		0.20 - 1.20 MM
Width		800 - 1250 MM
Unit Coil Weight		4 - 12 Mt
Coil ID		508 / 610 MM

Mechanical properties

Classified Symbol	Yield point (N/mm2)	Tensile Strength (N/mm2)	Elongation					Test piece and direction of tensile test
			Norminal thickness (mm)
			0.25 - 0.4	0.4-0.6	0.6-1.0	1.0-1.6	1.6-2.5
SGLCC	205 Min	270 Min	20	21	24	24	24	No. in rolling direction
SGLCD	/	270 Min	/	27	31	31	32
SGLCDD	/	270 Min	/	32	34	34	34
SGLC400	295	400 Min	16	17	18	18	18
SGLC440	335	440 Min	14	15	16	16	18
SGLC490	365	490 Min	12	13	14	14	16
SGLC570	560	570 Min	/	/	/	/	/

Tolerance of thickness

Norminal Thickness (t)		Width
		630≤w<1000	1000≤w<1250
t<0.25		(+/-) 0.04	(+/-) 0.04
0.25≤t<0.40		(+/-) 0.05	(+/-) 0.05
0.40≤t<0.60		(+/-) 0.06	(+/-) 0.06
0.60≤t<0.80		(+/-) 0.07	(+/-) 0.07
0.80≤t<1.00		(+/-) 0.07	(+/-) 0.08
1.00≤t<1.25		(+/-) 0.08	(+/-) 0.09
1.25≤t<1.60		(+/-) 0.10	(+/-) 0.11

Tolerance of width

Width (w)		Tolerance
800 <w≤1250mm		(0,+7mm)

Coating

Unit: g/m2

Coating weight symbol		AZ70	AZ90	AZ120	AZ150	AZ170	AZ185	AZ200
Average coating mass in triple-spot test		70	90	120	150	170	185	200
Minimum coating mass at a single spot		60	76	102	130	145	160	175

			Chemical Treatment Type of chamical treatment Symbol Chromate treatment C Non-chromate treatment NC Un-treated M

If you have plan to import coated steel (GI, PPGI, GL, PPGL steel coil), kindly do not hesitate to contact us at:

Mr. Triet Le

Mobile: +84 965 047 865

Email: trietlm@namkimgroup.vn

http://namkimvn.blogspot.com/2015/12/nam-kim-steel-vietnam-offer-coated.html

JIS 3302 Hot Dip Galvanized Steel Coil

Nam Kim Steel Manufacture in Vietnam

JIS 3302 HOT DIP GALVANIZED STEEL COIL (GI)

JIS G3302		Yield Point Minimum N/mm 2	Tensile Strength Minimum	Elongation Minimum %JỊ						Application
Classified symbol			N/mm 2	Nominal Thickness mm (t)
cold-rolled base metal	hot-rolled base metal			0.25≤	0.4≤	0.6≤	1.0≤	1.6≤	t≥2.5
				t<0.4	t<0.6	t<1.0	t<1.6	t<2.5
SGCC	SGHC	205	270	---	---	---	---	---	---	Commercial
SGCH	---	---	---	---	---	---	---	---	---	Commercial Hard
SGCD1	---	---	270	---	34	36	37	38	---	Drawing
SGC340	SGH340	245	340	20	20	20	20	20	20	Structural
SGC400	SGH400	295	400	18	18	18	18	18	18	Structural
SGC440	SGH440	335	440	18	18	18	18	18	18	Structural
SGC490	SGH490	365	490	16	16	16	16	16	16	Structural
---	SGH540	400	540				16	16	16	Structural
SGC570		560	570	---	---	---	---	---	---	Structural

Standard: AISI,ASTM,GB,JIS 
Grade: SS grade 33-80,SGCC, SGCH, SGCD1-SGCD3, SGC340-SGC570, SGCC, DX51D 
Thickness: 0.2-2.0mm
Place of Origin: Vietnam
Brand Name: Nam Kim Steel Group
Model Number: SGCC,SGCH,SGCD1-SGCD3,DX51D
Type: Steel Coil Technique: Cold Rolled 
Surface Treatment: Galvanized

Application: wide construction range,household appliance Special Use: High-strength Steel Plate Width: 600-1250mm

Length: as per customer's requirement 
Coil weight : 3-8MT - Coil ID: 508/610mm

Zinc Coating: Z50-Z275 
surface of the galvanized steel coil: normal spangle,
spangle Steel grade: SS grade 33-80,SGCC, SGCH, SGCD1-SGCD3, SGC340-SGC570, SGCC, DX51D
Certificate: ISO9001
Payment terms: T/T or L/C 
Delivery time: within 25 days after received the deposit
Packaging & Shipping
Packaging Detail: Standard seaworthy export package
Delivery Detail: According to the quantity or as per customer's request .

If you have plan to import coated steel (GI, PPGI, GL, PPGL steel coil), kindly do not hesitate to contact us at: 

Mr. Triet Le

Mobile: +84 965 047 865

Email: trietlm@namkimgroup.vn

http://namkimvn.blogspot.com/2015/12/nam-kim-steel-vietnam-offer-coated.html