SNI 4096-2007 (IC 1.2077.140.50) BjLAS

SNI 4096:2007

Indonesian National Standard

Zinc-aluminum Alloy-Coated Steel Sheets and Coils (Bj.L AS)

ICS 77.140.50 National Standardization Body

SNI

BSN

SNI 4096:2007

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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

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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 meetings, pre-agreements, and consensus meeting that were held on December 5th, 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 process through poll on 28th of August 28th of October 2007.

This Standard is produced by 77-01 Technical Committee for Metal, Steel and Steel Products.

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Zinc-aluminum Alloy-Coated Steel Sheets and Coils (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 alloy-coated steel sheets and coils. 2 Normative reference SNI 07-0308-1989, Testing methodology of carbonized steel chemical composition. SNI 07-0371-1998, Tensile testing gauge for metal testing materials. SNI 07-0408-1989, Tensile testing methodology. 3 Terms and definitions 3.1 zinc-aluminum alloy-coated steel sheets and coils (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 nominal thickness tolerance 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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Table 1 Classification of Bj.L-AS based on mechanical character with 50mm measure size

Table 2 Classification of Bj.L AS based on coating mass

5 Quality prerequisite 5.1 Material 5.1.1 Nominal thickness measure and tolerance of mother coil are stated on Table 3.

No Symbol Minimum yield

Strength (N/mm2)

Minimum Strain

(%) Lo=50 mm

Application

1 2 3 4 5 6

G1 G2 G3 G250 G300 G550

- - -

250 300 550

- 30 35 25 20 2

Profile Commercial forming Drawing Structure and Commercial forming Structure and Commercial forming Structure

Note 1 G1, G2, and G3 Tensile testing gauge is 90 against rolling direction. Note 2 G250, G300 and G 550 Tensile testing gauge is in the same direction with rolling direction.

No Symbol Coating mass per meter square

1

2

3

4

5

AS 50

AS 70

AS 100

AS 150

AS 200

50 g/m2

70 g/m2

100 g/m2

150 g/m2

200 g/m2

Note 1 AS 50 is only used indoor. Note 2 Based on coating mass testing on two surfaces triple spot test.

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Table 3 Nominal thickness and tolerance of mother coil

Tolerance No.

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 coils width

5.1.2 Coating material composition 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 composition 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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Table 4 Mother coil chemical composition

Chemical composition (% of mass), maximum Symbol

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

5.1.4 Mechanical character

The mechanical character on Table 5 is complying with AS 1397 2001, Steel sheet and strip hot-dip zinc-coated or aluminum/zinc-coated.

Table 5 Mechanical character

Tensile Testing Transversal bending test

Minimum strain (%) Symbol

Minimum yield strength

(N/mm2)

Minimum pull strength

(N/mm2) Lo=50 mm

Bending angle

()

Bending thorn

()

G1 G2 G3 G250 G300 G550

- - -

250 300 550

- - -

320 340 550

- 30 35 25 20 2

180 180 180 180 180

-

0t 0t 0t 0t 1t -

Note 1 G1, G2, and G3 Tensile testing gauge is 90 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 gauge Note 4 Lo is gauge length

5.2 Bonding 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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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

L < 1250 mm + 7 mm

0

L 1250 mm + 10 mm

0

5.5.2 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

P < 2000 mm + 10 mm

0

2000 mm P < 4000 mm + 15 mm

0

4000 mm P < 6000 mm + 20 mm

0

P 6000 mm +0.5 % (weigh)

0

NOTE Particularly for coil Bj.L AS with length 6000 mm, it is measured in weigh unit

5.6 Surface steepness

Bj.L AS steepness is stated in steepness ratio, calculated with determining maximum height across two waves on sheets 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 thickness 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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Table 8 Bj.L AS estimated thickness

Nominal thickness Bj.L AS (mm)

AS 200 AS 150 AS 100 AS 70 AS 50

Two surfaces equivalent thickness (mm) Notation

Nominal Thickness Mother Coil

(mm) 0.060 0.046 0.027 0.019 0.015

Bj.L AS-20 Bj.L AS-25 Bj.L AS-27 Bj.L AS-30 Bj.L AS-35 Bj.L AS-40 Bj.L AS-42 Bj.L AS-45 Bj.L AS-50 Bj.L AS-55 Bj.L AS-60 Bj.L AS-65 Bj.L AS-70 Bj.L AS-75 Bj.L AS-80 Bj.L AS-85 Bj.L AS-90 Bj.L AS-95

Bj.L AS-100 Bj.L AS-110 Bj.L AS-120

0.20 0.25 0.27 0.30 0.35 0.40 0.42 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.10 1.20

0.260 0.310 0.330 0.360 0.410 0.460 0.480 0.510 0.560 0.610 0.660 0.710 0.760 0.810 0.860 0.910 0.960

1.010 1.060 1.160 1.260

0.246 0.296 0.316 0.346 0.396 0.446 0.466 0.496 0.546 0.596 0.646 0.696 0.746 0.796 0.846 0.896 0.946 0.996 1.046 1.146 1.246

0.227 0.277 0.297 0.327 0.377 0.427 0.447 0.477 0.527 0.577 0.627 0.677 0.727 0.777 0.827 0.877 0.927 0.977 1.027 1.127 1.227

0.219 0.269 0.289 0.319 0.369 0.419 0.439 0.469 0.519 0.569 0.619 0.669 0.719 0.769 0.819 0.869 0.919 0.969 1.019 1.119 1.219

0.215 0.265 0.285 0.315 0.365 0.415 0.435 0.465 0.515 0.565 0.615 0.665 0.715 0.765 0.815 0.815 0.915 0.965 1.015 1.115 1.215

NOTE 1 Notation indicates mother coils nominal thickness, NOTE 2 Equivalent thickness of zinc-aluminum mixture of two surfaces Bj.L AS, which

is calculated empirically.

5.9 Zinc-aluminum coatings mass and its tolerance Minimum required mass of zinc-aluminum coating of Bj.L AS is consistent with Table 9.

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Table 9 Minimum mass of zinc-aluminum coating

Minimum mass of zinc-aluminum coating (g/m2)

Two surfaces One surface Symbol 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

Calculation 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 : Mother coil mass/m2 calculation is: M = d 1000

with: M is mother coils mass per m2; is steels density (7850 kg/m3); d is steels thickness (mm). Calculation of Bj.L-AS mass per m2 is: m (Bj.L-AS) = M + coatings mass constant. Example: 1) For a mother coil with thickness 1.20 mm AS 200; M = 7850 x 1.2 = 9,420 kg/m2 1000 2) Coatings mass constant for AS 200 = 0.2000 kg/m2; 3) 1 m2 Bj.L-AS mass = 9.4200 + 0.2000 = 9.6200 kg/m2; 4) Decimal place for this calculation is 4 (four) digits behind comma.

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Table 10 Coatings mass and class constant for mass calculation (total two surfaces)

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 methodology 7.1 Visible nature testing Conducted without using magnifying glass / microscope. 7.2 Chemical composition testing of carbonized 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 Thickness 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, 90 against rolling direction, one spot in the middle part of sample, two spots at the outer sides, not less than 15 mm from both samples 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.

Symbol Coatings mass constant (g/m2)

AS 200 AS150 AS 100 AS 70 AS 50

200 150 100 70 50

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7.5 Bonding 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 180 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 180 and then the point of bend coating is peeled and then the

surface is observed. If there 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 Maximum bending thorn (t) for coating bonding testing

Maximum bend Symbol

AS 200 AS 150 AS 100 AS 70 AS 50

Bj.L-AS-G1 Bj.L-AS-G2 Bj.L-AS-G3

Bj.L-AS-G250 Bj.L-AS-G300 Bj.L-AS-G550

0t 0t 0t 0t 1t 2t

0t 0t 0t 0t 1t 2t

0t 0t 0t 0t 1t 2t

0t 0t 0t 0t 1t 2t

0t 0t 0t 0t 1t 2t

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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 surface; conducted on one of whichever side from triple spot test. Figure 3 Determining spots for weight testing sample for zinc-aluminum coating 7.7 Tensile 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 waves length (mm) T is waves height (mm)

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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 testing 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 prerequisite 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 the 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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- 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 coatings mass, for example: AS 150; - Production code Product marking must use the clear and permanent letters, and must also state manufacturers 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; - Coils weight measure, in metric tons; - The symbol of Zinc-Aluminum Mixture coatings mass, for example: AS 150; - Production code Product marking must use the clear and permanent letters, and must also state manufacturers name and registered trade mark.

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Bibliography

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SNI 4096-2007 (IC 1.2077.140.50) BjLAS