GOST 14918 sheet ots

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Galvanized sheet GOST 14918-80 (technical conditions and requirements)

Standard 14918-80 applies to cold-rolled carbon steel 0.5 to 2.5 mm thick that has been continuously hot-dip galvanized (which results in the formation of a corrosion-resistant Zn-Fe alloy on the metal surface). For galvanizing low-carbon steels, technical conditions are determined separately, by standard R 52246-2004.

№	Classification of galvanized steel GOST 14918-80	Groups, categories, classes	Abbreviation (used for symbolic designation)
1	Assignment Groups	General purpose	HE
		For cold stamping	XSh
		For cold profiling	HP
		For painting	PC
2	Hood categories	Very deep draw	VG
		Deep	G
		Normal	N
3	Tread quality	Reduced thickness variation	UR
3	Tread quality	Normal thickness variation	HP
4	Galvanization layer thickness, class	I class	1
		II class	2
		Elevated	P
5	Appearance of galvanization/type of crystallization pattern (by agreement with the customer)	With crystallization pattern	KR
5		Without crystallization pattern	MT

Why do you need to know the mass of a leaf?

The following points need to be highlighted here:

To determine the dimensions of the profile of supports and floors. Based on the weight of the sheets, the load on the load-bearing elements of the metal structure is determined. Neglect of this point leads to premature destruction of the structure;
The weight of the sheet steel gives an idea of the thickness of the galvanized surface. If the sheet weight exceeds its nominal value, while the total thickness corresponds to the declared value, this indicates that the sheet is galvanized of poor quality. The amount of zinc on the metal surface is underestimated, which will negatively affect its service life.

Galvanized sheet, dimensions according to GOST 19904-90 (assortment)

Dimensions, maximum deviations and requirements for manufacturing accuracy for galvanized steel are established by the GOCT 19904-90 assortment in the same way as for non-galvanized cold-rolled sheet steel.

Galvanized steel according to specifications in accordance with GOCT 14918-80 is manufactured in widths from 700 to 1800 mm (size increments depending on the range of 50, 100 and 150 mm), lengths from 1000 to 6000 mm (size increments 20, 80, 100, 150, 200, 300, 500 mm), however, by agreement with the consumer, if necessary, other sizes can be installed.

The thickness of the galvanized sheet is regulated in the range from 0.5 to 2.55 mm, and the assortment determines the following dimensional step:

thickness range 0.5-0.8 mm - step is 0.05 mm;
range 0.8-1.8 mm - step 0.1 mm;
range 1.8-2.5 - step 0.2, last - 0.3 mm.

Sheet according to GOST No. 14918-80

The standard conditions apply to steel in the form of sheets and coils that are hot-dip galvanized in permanent galvanizing units.

The technical degree coefficients, which are established by standard norms, must be in accordance with the requirements of the first two quality categories.

Galvanized sheet steel is divided into:

1. By purpose:

for types for cold stamping - X W,
for cold profiling - X P,
for painting - P K,
general use - OH;

2. According to the ability to draw (steel category X W):

conventional hood - H,
deep drawing - G,
very deep drawing - V G;

3. According to the uniform thickness of the special zinc coating:

with normal thickness variation - HP,
with reduced thickness variation - U P;

4. By mutual agreement of the customer and the manufacturer, steel can be manufactured:

with zinc stains on the surface - KP,
without zinc stain on the surface - MT;

5. Depending on the thickness of the special coating, galvanized steel is divided into three classes:

elevated,
first,
second.

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Weight of galvanized sheet

The weight of a galvanized sheet (one square meter) can theoretically be calculated using the formula:

M=M1×t1+M2×t2

(1)

Where:

M - weight of 1 m² of galvanized sheet, kg;
M1 - weight of 1 m² of steel sheet without a cladding layer 1 mm thick;
t1 is the thickness of the steel sheet without coating;
M2 - weight of 1 m² of zinc cladding layer 1 mm thick;
t2 is the thickness of the zinc layer on both sides of the sheet.

The specific gravity of carbon steel is 7.85 g/cm³, or, for convenience of calculations, it is generally accepted that 1 m² of sheet steel with a thickness of 1 mm weighs 7.85 kg. The specific gravity of zinc is slightly less - 7.13 g/cm³, that is, 1 m² of zinc with a thickness of 1 mm weighs 7.13 kg. Taking into account these quantities, formula (1) can be rewritten:

M=7.85×t1+7.13×t2

The thickness of the zinc layer depends on the coating class (GOCT 14918-80) and is indicated in the symbol:

Class	Limit values for layer thickness, mm	Weight of tread layer on both sides, kg
I	From 0.018 to 0.04 Average value 0.029	0.258-0.570 Average 0.414
II	From 0.01 to 0.018 Average value 0.014	0.1425-0.258 Average 0.200
P (increased)	From 0.04 to 0.06	0.57-0.855 Average 0.712

To calculate the weight of a galvanized sheet, you can also use a formula that takes into account the weight of the coating depending on the class of layer thickness:

M=7.85×t1+Mp.s., where:

M - galvanized sheet weight 1 m², kg
t1 is the thickness of the steel sheet without coating;
Mp.s. - the average weight of the tread layer depending on the thickness class, the value is standardized by GOCT 14918-80.

To calculate how much a galvanized sheet weighs (the weight of one sheet of the required size), use the formula:

Msheet=M×S, where:

Msheet - weight of one galvanized sheet, kg;
M – weight of 1 m², kg;
S—sheet area, m².

Considering that the GOST 19904-90 assortment allows deviations from the design weight of up to 3% (due to regulated maximum deviations in thickness, length and width), as well as taking into account the small thickness of the cladding layer and the small difference between the specific gravity of steel and zinc alloy ( which may contain lead and aluminum), the theoretically calculated mass may differ slightly from the actual weight.

№	Sheet thickness, mm	Weight of 1 m² of steel without zinc coating , kg	Weight of 1 m² of galvanized steel, 1 class of coating thickness , kg	Weight of 1 m² of galvanized steel, class 2 coating thickness , kg	Weight of 1 m² of galvanized steel, coating thickness class P , kg	Number of m² per ton of galvanized steel class 2
1	0,50	3,925	4,339	4,125	4,637	242,42
2	0,55	4,317	4,731	4,517	5,029	221,36
3	0,60	4,710	5,124	4,910	5,422	203,67
4	0,65	5,103	5,517	5,303	5,815	188,60
5	0,70	5,495	5,909	5,695	6,207	175,59
6	0,75	5,888	6,302	6,088	6,600	164,2
7	0,80	6,280	6,694	6,480	6,992	154,32
8	0,90	7,065	7,479	7,265	7,777	137,65
9	1,00	7,850	8,264	8,050	8,562	124,22
10	1,10	8,635	9,049	8,835	9,347	114,09
11	1,20	9,420	9,834	9,620	10,132	103,95
12	1,50	11,775	12,189	11,975	12,487	83,51
13	2,00	15,700	16,114	15,900	16,412	62,89
14	2,50	19,625	20,039	19,825	20,337	50,45

According to GOCT 14918-80, galvanized steel can be manufactured with a differentiated coating: on one side thickness class No. 2, and on the other - No. 1 or P, which is taken into account when calculating weight.

Calculation of the mass of galvanized sheet

To determine the mass of a galvanized sheet, depending on its area and thickness, you can use one of three methods.

Online calculator

This is the simplest option, allowing you to determine by the size of the sheet its mass, area, and number of sheets per ton.

Determining the weight of galvanized steel sheet using the formula

Formula M = A * B * h * ρ , in which:

M – mass, kg;

A – length, m;

B – width, m;

h – thickness, mm;

ρ – average steel density equal to 7.85 kg/dm3.

Determination of the mass of galvanized steel according to the table

Table of weights of galvanized sheets in kg, having the most common sizes

Thickness, mm	Weight 1 m2, kg	Sheet weight, kg
Thickness, mm	Weight 1 m2, kg	1.0x2.0 m	1.25x2.5 m
0,5	3,9	7,8	12,2
0,55	4,3	8,58	13,4
0,6	4,7	9,36	14,6
0,7	5,45	10,9	17,1
0,8	6,25	12,5	19,5
0,9	7,0	14,0	21,9
1,0	7,8	15,6	24,4
1,1	8,6	17,2	27,0
1,2	9,35	18,7	29,4
1,3	10,15	20,3	31,7
1,4	10,9	21,8	34,1
1,5	11,7	23,4	36,6
1,6	12,5	25,0	39,0
1,7	13,25	26,5	41,4
1,8	14,05	28,1	43,9
2,0	15,6	31,2	48,8

All of the above options allow you to determine the theoretical weight of the galvanized sheet, which may differ slightly from the actual one.

Range and technical requirements for galvanizing

Technical conditions for galvanized sheet metal produced on continuous production lines are regulated by GOST 14918-80. In particular, they stipulate that the weight of galvanized iron depends on the quality of the coating:

High quality coating: weight of 1 m2 of double-sided galvanized layer 570...855 g, with a coating thickness of 40...60 microns;
Coating of the first quality class: weight of 1 m2 of double-sided galvanized layer 258...570 g, with a coating thickness of 18...40 microns;
Coating of the second quality class: weight of 1 m2 of double-sided galvanized layer 142.5...258 g, with a coating thickness of 10...18 microns.

The standard allows for coatings differentiated by thickness. In this case, the difference in thickness and weight should not exceed the values specified for related galvanization classes. In subsequent calculations, it is necessary to convert the coating thickness values from microns to mm (in 1 mm - 1000 microns).

Weight

Not a single state standard strictly stipulates the weight of one galvanized sheet. However, this indicator is often very important, especially when you need to find out whether the vehicle can withstand the load. To calculate the mass of one sheet, you can use an indicator such as the specific gravity of the material, which is approximately 7.8 g per cubic centimeter.

Approximate weights in kilograms are given in the following table:

Size, mm	Thickness, mm
Size, mm	0,5	0,55	0,6	0,7	0,8	0,9	1	1,1	1,2	1,3
1000x2000	7,8	8,58	9,36	10,9	12,5	14	15,6	17,2	18,7	20,3
1250x2500	12,2	13,4	14,6	17,1	19,5	21,9	24,4	26,8	29,3	31,7
Size, mm	Thickness, mm
Size, mm	1,4	1,5	1,6	1,7	1,8	2
1000x2000	20,3	21,8	23,4	25	26,5	28,1
1250x2500	31,7	34,1	36,6	39,0	41,4	43,9

It is worth noting that the cost of one galvanized sheet will directly depend on its thickness, size and, accordingly, weight. The heavier the sheet, the more money you will have to pay for it.

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