SNI 4096:2007
Indonesian National Standard
Zinc-aluminum inc-alumin um Allo y-Coa y-Coated ted Steel Steel Sheets Sheets and Coils Coil s (Bj.L (Bj .L AS)
ICS 77.140.50 77.140.5 0
National Standardization Body
BSN
SNI 4096:2007 Table of content
Table of Content ...............................................................................................................................
i
Preface.............................................................................................................................................
ii
1
Scope.......................................................................................................................................
1
2
Normative reference.................................................................................................................
1
3
Terms and definitions ...............................................................................................................
1
4
Symbol, classification and applications .....................................................................................
1
5
Quality prerequisite...................................................................................................................
2
6
Sampling Method .....................................................................................................................
8
7
Testing methodology ................................................................................................................
8
8
Pass examination prerequisite.................................................................................................. 11
9
Marking .................................................................................................................................... 11
i
SNI 4096:2007 Preface
Indonesian National Standard (SNI) for “Zinc-aluminum Alloy-Coated Steel Sheets and Coils (Bj.L AS)” is the revision of SNI 07-4096-1996 for Zinc-aluminum Alloy-Coated Steel Sheets and Coils. SNI 07-4096-1996 was revised due to: 1. The improvement of technology for processing Bj. L-AS, in order to meet the demands of domestic and export market. 2. Protect the final consumers in regard to product quality assurance. 3. Control of non-standard imported products. 4. Implementing National Standardization System, in order to evaluate SNI every 5 years. This SNI was revised on the fields of: Scope Normative reference Terms and definitions Symbol, classification and applications Quality prerequisite Sampling Method Testing Methodology Pass examination prerequisite Marking
This standard had been discussed in technical m eetings, pre-agreements, and consensus meeting that th were held on December 5 , 2006 at Jakarta. Those meetings were attended by the members of Metal, Steel and Steel Derivatives Technical Committee, producer and consumer representatives, testing houses and related government instances. Later, this standard had been passed national consensus th th process through poll on 28 of August – 28 of October 2007. This Standard is produced by 77-01 Technical Committee for Metal, Steel and Steel Products.
ii
SNI 4096:2007 Zinc-aluminu m All oy-Coated Steel Sheets and Coil s (Bj.L AS)
1
Scope
This standard establish definition, classification, quality prerequisite, sampling method, testing methodology, pass examination prerequisite, and requirements for marking of zinc-aluminum alloycoated steel sheets and coils. 2
Normati ve referenc e
SNI 07-0308-1989, Testing methodology of carbonized steel chemical composition. SNI 07-0371-1998, Tensile testing gauge for m etal testing materials. SNI 07-0408-1989, Tensile testing methodology. 3
Terms and definit ions
3.1 zinc-aluminum allo y-coated steel sheets and coil s (Bj.L-AS) steel sheets and coils coated by hot-dip process, with aluminum mixture 50%-60%, zinc mixture 40%50%, and other substance mixture. 3.2 mother coil steel coils obtained from directly cold-rolled product. 3.3 nominal thickness of Bj.L AS mother coil thickness size at the center part of cold-rolled carbonized steel in the same direction with rolling direction. 3.4 nomin al thick ness toleranc e of Bj.L AS mother coil allowable nominal thickness measure deviation limit. 3.5 yield strength lower yield strength. If yielding was not visible on the graph or measuring gauge, then the value of yield strength is determined with offset 0.2% method. 4
Symbol, classification and applications
The classification of Bj.L-AS can be separated as lower yield strength (stretch limit), lower strain, and zinc-aluminum weight, as shown by Table 1 and Table 2.
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SNI 4096:2007 Table 1
Classificatio n of Bj.L-AS based on mechanic al character with 50mm measure size
Minimum yield No
Symbol
Strength 2 (N/mm )
Minimum Strain (%)
App li cat io n
Lo=50 mm
1
G1
-
-
Profile
2
G2
-
30
Commercial forming
3
G3
-
35
Drawing
4
G250
250
25
Structure and Commercial forming
5
G300
300
20
Structure and Commercial forming
6
G550
550
2
Structure
Note 1
G1, G2, and G3 Tensile testing gauge is 90º against rolling direction.
Note 2
G250, G300 and G 550 Tensile testing gauge is in the same direction with rolling direction.
Table 2
Classificatio n of Bj.L AS based on coating mass
No
Symbol
Coating mass per meter square
1
AS 50
50 g/m
2
AS 70
70 g/m
3
AS 100
100 g/m
4
AS 150
150 g/m
5
AS 200
200 g/m
2
2
2
2
2
Note 1 AS 50 is only used indoor. Note 2 Based on coating mass testing on two surfaces – triple spot test.
5
Quality prerequis ite
5.1
Material
5.1.1
Nominal thickness measure and tolerance of mother coil are stated on Table 3.
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SNI 4096:2007 Table 3
No.
Nominal thick ness and tolerance of mother coil Tolerance
Nominal Thickness
L
≤ 630
630 < L
≤ 1000
1000 < L
≤ 1250
630 < L
≤ 1000
1
0.20
± 0.010
± 0.010
± 0.015
-
2
0.25
± 0.025
± 0.025
± 0.025
-
3
0.27
± 0.030
± 0.030
± 0.025
-
4
0.30
± 0.030
± 0.030
± 0.030
-
5
0.35
± 0.040
± 0.040
± 0.030
-
6
0.40
± 0.040
± 0.040
± 0.040
± 0.040
7
0.42
± 0.040
± 0.040
± 0.040
± 0.040
8
0.45
± 0.050
± 0.050
± 0.040
± 0.050
9
0.50
± 0.050
± 0.050
± 0.050
± 0.060
10
0.55
± 0.050
± 0.050
± 0.050
± 0.060
11
0.60
± 0.050
± 0.050
± 0.050
± 0.060
12
0.65
± 0.050
± 0.050
± 0.050
± 0.060
13
0.70
± 0.060
± 0.060
± 0.060
± 0.070
14
0.75
± 0.060
± 0.060
± 0.060
± 0.070
15
0.80
± 0.060
± 0.060
± 0.060
± 0.070
16
0.85
± 0.060
± 0.060
± 0.060
± 0.070
17
0.90
± 0.070
± 0.070
± 0.080
± 0.080
18
0.95
± 0.070
± 0.070
± 0.080
± 0.080
19
1.00
± 0.070
± 0.070
± 0.080
± 0.080
20
1.10
± 0.070
± 0.070
± 0.080
± 0.080
21
1.20
± 0.070
± 0.070
± 0.080
± 0.080
Note L is mother coil’s width
5.1.2
Coating material composi tion
Coating material composition is made up of mixture of aluminum 50% - 60%, zinc 40% - 50% and other substances by hot-dip method/process. 5.1.3
Mother coil chemical compos ition
The chemical composition of mother coil on Table 4 is complying with AS 1397 – 2001 (Steel sheet and strip – Hot-dip zinc-coated or aluminum/zinc-coated).
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SNI 4096:2007 Table 4
Chemical composi tion (% of mass), maximum
Symbol
5.1.4
Mother coil chemical compo sition
C
Mn
P
S
G1
0.12
0.50
0.040
0.035
G2
0.10
0.45
0.030
0.030
G3
0.08
0.40
0.020
0.025
G250
0.12
0.50
0.040
0.035
G300
0.30
1.60
0.040
0.035
G550
0.20
1.20
0.040
0.030
Mechanical character
The mechanical character on Table 5 is complying with AS 1397 – 2 001, Steel sheet and strip – hot-dip zinc-coated or aluminum/zinc-coated. Tabl e 5
Mechani cal charac ter
Tensile Testin g Symbol
Minimum
Minimum
yield strength
pull strength
2
5.2
Transversal bending test
2
Minimum strain (%)
Bending
Bending
angle
thorn
(N/mm )
(N/mm )
Lo=50 mm
(º)
(º)
G1
-
-
-
180
0t
G2
-
-
30
180
0t
G3 G250
250
320
35 25
180 180
0t 0t
G300 G550
300 550
340 550
20 2
180 -
1t -
Note 1
G1, G2, and G3 Tensile testing gauge is 90º against rolling direction.
Note 2
G250, G300 and G 550 Tensile testing gauge is in the same direction with rolling direction.
Note 3
t is testing g auge
Note 4
Lo is gauge length
Bondin g strength of zinc-aluminum coating
Bonding strength of zinc-aluminum coating requires that there is no peeling of steel sheets and rolls after bending test is done. 5.3
Bending ability
Bending ability of Bj.L AS requires that there is no cracking on the outer part of mother coil after bending ability testing is done. 5.4
Visible nature
On Bj.L AS surface, there must be no hole, rip, spots without zinc-aluminum coating and surface defects that may affect performance.
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SNI 4096:2007 5.5
Measurement
5.5.1
Width and tolerance measure of coil Bj.L AS is consistent with Table 6. Table 6
Width and tolerance of Bj,L AS
Width
Tolerance + 7 mm
L < 1250 mm
0 + 10 mm
L ≥ 1250 mm
5.5.2
0
Length and tolerance measure of flat sheet Bj.L AS is consistent with Table 7. Table 7
Length and tolerance measure of sheet Bj.L AS
Length ( P )
Tolerance + 10 mm
P < 2000 mm
0 + 15 mm
2000 mm ≤ P < 4000 mm
0 + 20 mm
4000 mm ≤ P < 6000 mm
0 +0.5 % (weigh)
P ≥ 6000 mm
0
NOTE Particularly for coil Bj.L AS with length ≥ 6000 mm, it is measured in weigh unit
5.6
Surfac e steepn ess
Bj.L AS steepness is stated in steepness ratio, calculated with determining maximum height across two waves on sheet’s surface divided by the distance between those waves. Maximum steepness ratio for class A Bj.L AS with ≤ 1.7 mm thickness is 1.2%, please see Figure 5. 5.7
Camber
Maximum value for Bj.L AS camber is 0.20% of actual size, please see Figure 5. 5.8
Bj.L AS estimated thickn ess
Bj.L AS estimated thickness is stated in Table 8, where those thicknesses are the nominal thickness of mother coil added with equivalent thickness of zinc-aluminum coating (confirmed with material nominal thickness).
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SNI 4096:2007 Table 8
Bj.L AS estimated thickn ess
Nominal thic kness Bj.L AS (mm) Nominal Thickness Notation
Mother Coil
AS 200
AS 150
AS 100
AS 70
AS 50
Two surfaces equivalent thickness (mm)
(mm)
0.060
0.046
0.027
0.019
0.015
Bj.L AS-20
0.20
0.260
0.246
0.227
0.219
0.215
Bj.L AS-25
0.25
0.310
0.296
0.277
0.269
0.265
Bj.L AS-27
0.27
0.330
0.316
0.297
0.289
0.285
Bj.L AS-30
0.30
0.360
0.346
0.327
0.319
0.315
Bj.L AS-35
0.35
0.410
0.396
0.377
0.369
0.365
Bj.L AS-40
0.40
0.460
0.446
0.427
0.419
0.415
Bj.L AS-42 Bj.L AS-45
0.42 0.45
0.480 0.510
0.466 0.496
0.447 0.477
0.439 0.469
0.435 0.465
Bj.L AS-50
0.50
0.560
0.546
0.527
0.519
0.515
Bj.L AS-55
0.55
0.610
0.596
0.577
0.569
0.565
Bj.L AS-60
0.60
0.660
0.646
0.627
0.619
0.615
Bj.L AS-65 Bj.L AS-70
0.65 0.70
0.710 0.760
0.696 0.746
0.677 0.727
0.669 0.719
0.665 0.715
Bj.L AS-75 Bj.L AS-80
0.75 0.80
0.810 0.860
0.796 0.846
0.777 0.827
0.769 0.819
0.765 0.815
Bj.L AS-85
0.85
0.910
0.896
0.877
0.869
0.815
Bj.L AS-90 Bj.L AS-95
0.90 0.95
0.960 1.010
0.946 0.996
0.927 0.977
0.919 0.969
0.915 0.965
Bj.L AS-100 Bj.L AS-110
1.00 1.10
1.060 1.160
1.046 1.146
1.027 1.127
1.019 1.119
1.015 1.115
Bj.L AS-120
1.20
1.260
1.246
1.227
1.219
1.215
NOTE 1 Notation indicates mother coil’s nominal thickness, NOTE 2 Equivalent thickness of zinc-aluminum mixture of two surf aces Bj.L AS, which is calculated empirically.
5.9
Zinc-aluminum coating’ s mass and its tolerance
Minimum required mass of zinc-aluminum coating of Bj.L AS is consistent with Table 9.
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SNI 4096:2007 Table 9
Minimum mass of zinc-aluminum coating 2
Minimum mass of zinc-aluminum coating (g/m ) Two surf aces
Symbol
One surf ace
Triple spot test (average)
Single spot test (individual)
Single spot test (individual)
AS 200
200
180
80
AS 150
150
135
60
AS 100
100
90
40
AS70
70
63
28
AS 50
50
45
20
Calcu lation for Bj .L-AS sheets and coils mass Calculation for Bj.L-AS sheets and coils mass, theoretically stated with M with kg mass unit : 2
Mother coil mass/m calculation is: M= ρd 1000 with: 2
M is mother coil’s mass per m ; 3
Ρ is steel’s density (7850 kg/m ); d is steel’s thickness (mm). 2
Calculation of Bj.L-AS mass per m is: m (Bj.L-AS) = M + coating’s mass constant. Example: 1) For a mother coil with thickness 1.20 mm AS 200; 2
M = 7850 x 1.2 = 9,420 kg/m 1000
2
2) Coating’s mass constant for AS 200 = 0.2000 kg/m ; 2
2
3) 1 m Bj.L-AS’ mass = 9.4200 + 0.2000 = 9.6200 kg/m ; 4) Decimal place for this calculation is 4 (four) digits behind comma.
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SNI 4096:2007 Table 10
Coating’s mass and class const ant for mass calculatio n (total two surfaces) 2
Symbol
Coating’s mass con stant (g/m )
AS 200
200
AS150
150
AS 100
100
AS 70 AS 50
70 50
6
Sampling
6.1
Sampling is conducted only by authorized officer, according to regulations.
6.2
Rolled Bj.L-AS with the same specification weighing up to 50 tons is represented by 1 (one) sample sheet with 1 (one) meter length, subsequently every 50 tons fold will be taken 1 (one) sample sheet, and at most 10 samples.
6.3
Bj.L-AS sheets amounting up to 3000 sheets with the same specification is represented by 1 (one) sample sheet. Subsequently, in every 3000 sheets will be taken 1 (one) sample sheet, and at most 10 samples.
6.4
Sampling is conducted randomly.
7
Testing methodolog y
7.1
Visible nature testing
Conducted without using magnifying glass / microscope. 7.2
Chemical compos ition testing of carbon ized steel
Mother coil carbonized steel chemical composition testing is conducted by using spectrometer or by following SNI 07-0308-1989, Testing methodology of carbonized steel chemical composition. 7.3
Thick ness testing of mother coil
The measurement of mother coil thickness Bj.L-AS is conducted after the zinc-aluminum coating is removed. It is measured at least by three in-line spots, 90º against rolling direction, one spot in the middle part of sample, two spots at the outer sides, not less than 15 mm from both sample’s tips, using tolerance as stated in Table 3 (Nominal thickness and tolerance of mother coil). 7.4
Dimension measurement
Dimension measurement uses measurement gauge with 0.5 mm accuracy degree.
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SNI 4096:2007 7.5
Bondin g and bend ability testing
7.5.1
Tested sample measure is 75 mm x 125 mm, taken transversally against rolling direction.
7.5.2
Tested sample is bended 180º and then the point of bend is observed. If there was no peeling/cracking, then its bend ability is zero t (0t).
7.5.3
Tested sample is bended 180º and then the point of bend coating is peeled and then the surface is observed. If t here was no crack seen, then its bend ability is zero t (0t).
7.5.4
The first bend is called as zero t, then the second bend is one t (1t) and so on.
7.5.5
Testing results must consistent with Table 11. Table 11 Maximu m bending thor n (t) for coating bondin g testing
Symbol
Maximum bend AS 200
AS 150
AS 100
AS 70
AS 50
Bj.L-AS-G1
0t
0t
0t
0t
0t
Bj.L-AS-G2
0t
0t
0t
0t
0t
Bj.L-AS-G3
0t
0t
0t
0t
0t
Bj.L-AS-G250
0t
0t
0t
0t
0t
Bj.L-AS-G300 Bj.L-AS-G550
1t 2t
1t 2t
1t 2t
1t 2t
1t 2t
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SNI 4096:2007 7.6
Weight testing of zinc-aluminum coating
Coating weight testing is conducted on testing sample with three criteria: 7.6.1 Triple spot test – two surfaces; conducted on three testing samples that derived from one testing sample plate source (generally measure 300 mm x full width); one piece is cut from the center part and the other are from both sides of the plate, yet not closer than 25 mm from each tip. 7.6.2 Single spot test – two surfaces; conducted on one testing sample that derived from one of whichever three testing samples from triple spot test. 7.6.2
Single spot test – one surf ace; conducted on one of whichever side from triple spot test.
Figure 3 Determini ng spots for weigh t testing sample for zinc-aluminum c oating
7.7 Tensil e testing The methodology of tensile testing is conducted in comply with SNI 07-0408-1989, Methodology of metal tensile testing and SNI 07-0371-1998, Tensile testing gauge for metal . 7.8
Steepness testing
Steepness measurement is conducted based on below formula:
Figure 4 Surface steepnes Legend: P is wave’s length (mm) T is wave’s height (mm)
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SNI 4096:2007 Steepness ratio is calculated with the following formula: Steepness ratio = T x 100% P Specification of steepness ratio refers to Table 8. 7.9
Camber testi ng
Camber testing is conducted based on the following formula:
Figure 5 Camber Legend: P is the length (mm) L is the width (mm) K is the camber (mm) Camber value (Kc) is measured using the following formula: Kc = T x 100% P Maximum camber value is stipulated at pointer 5.7. 8
Pass examination prerequisi te
8.1
Product lot is declared passing the examination if it meets all of quality prerequisites.
8.2
Should part of quality prerequisites can not be fulfilled, then re-examination can be conducted with twice of testing sample amount from t he same group.
8.3
If re-examination produced fully fulfilled quality prerequisite, then product lot is declared pass.
9
Marking
9.1
Bj.L -AS sheets
The marking is applied towards every packaging and product sheet at least with the following tags: -
The name or identity or symbol of producer and of trade mark.
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SNI 4096:2007 -
Complete specification of Bj.L-AS, for example: Bj.L-AS.20- G300;
-
The size of length x width x thickness of mother coil, in mm; The symbol of Zinc-Aluminum Mixture coating’s mass, for example: AS 150;
-
Production code
Product marking must use the clear and permanent letters, and must also state manufacturer’s name and registered trade mark. 9.2
Bj.L-AS coils
The marking is applied towards every product at the beginning and at ending points of roll, at least with the following tags: -
The name or identity or symbol of producer and of trade mark.
-
Complete specification of Bj.L-AS, for example: Bj.L-AS-G300;
-
The nominal size of width x thickness of mother coil, in mm;
-
Coil’s weight measure, in metric tons;
-
The symbol of Zinc-Aluminum Mixture coating’s mass, for example: AS 150;
-
Production code
Product marking must use the clear and permanent letters, and must also state manufacturer’s name and registered trade mark.
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SNI 4096:2007 Bibliography
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