Contents. Introduction. Coating layer : Fine ternary eutectic structure of Zn, Al, and Zn2Mg. 1 Nisshin Steel Quality Products

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2 Introduction Contents Cross-sectional structure of the coating layer Al 30 Zn Plating layer Steel sheet Zn2Mg Enlarged photo of eutectic structure Coating layer : Fine ternary eutectic structure of Zn, Al, and Zn2Mg 1 Nisshin Steel Quality Products

3 Features Nisshin Steel Quality Products 2

4 Typical applications Typical applications Cable racks Cable racks Indoor baseball field Heavy shutter Cable duct Compost house Compost house Cowshed Ceiling crosspiece Wall stud(wall track) Sound barrier louver Greenhouse structural material Vineyard trellises Structural materials for residential house Structural materials for residential house (pillar) Structural materials for residential house (beam) 3 Nisshin Steel Quality Products Nisshin Steel Quality Products 4

5 Typical applications Typical applications Ventilation duct for train depot Air conditioning unit Switchboard Bicycle racks Sound barrier louver(station building) Internal material of platform door Solar power generator mount Solar power generator(installed) Deck plate for parking lot Trough bridge Cable bracket Cable duct Rock bolt Rock bolt Steel framed deck Supporting pillars for light-blocking net along highways Sound barrier members Sound barrier member (enlarged view) Wind barrier panels Wind barrier panel (enlarged view) Sound barrier 5 Nisshin Steel Quality Products Nisshin Steel Quality Products 6

6 Typical applications Typical applications Window anchor Window anchor Console box bracket Motor cover Window anchor Door supporter Windshield wiper parts Mouting strap Wall socket Bottom plate for outdoor unit of air conditioner Mouting strap Switch 7 Nisshin Steel Quality Products Nisshin Steel Quality Products 8

Manufacturing processes Cooling tower Tension leveler Cooling

Post-treatment Oiler Upright direct-fired reducing furnace Shipment

skin-pass mill 4-pot galvanizing pot To galvanizing equipment Welder

Galvanizing pot HCGL annealing furnace (upright direct-fired

7 Manufacturing processes Cooling tower Tension leveler Cooling section Horizontal radiant tube furnace Preheating furnace Post-treatment Oiler Upright direct-fired reducing furnace Shipment Exit-side looper Tension reel Payoff reel Pre-treatment 2-stand skin-pass mill 4-pot galvanizing pot To galvanizing equipment Welder Entry-side looper From pickling and cold-rolling equipment Galvanizing pot HCGL annealing furnace (upright direct-fired reducing furnace) HCGL annealing furnace (horizontal radiant tube furnace) 9 Nisshin Steel Quality Products

8 Quality characteristics Thin Zinc-Aluminum based film containing Mg. Coating layer Steel base Coating layer Corrosion of coating layer suppressed Excellent Corrosion resistance Initial exposure period (up to several weeks) Coating layer Substrate The exposed substrate of cut end is oxidized Red rust Intermediate exposure period (beyond several weeks) Substrate The thin zinc-based film containing Mg on the coating layer flows over the cut end Gradually changes to gray and eventually a gray-black color Long exposure period (after more than a year) Substrate (1) Protective effect of the thin zincbased layer containing Mg. (2) Sacrificial anticorrosive effect of the coating layer near the end face Sacrificial anticorrosive effect of the highly corrosion-resistant coating layer lasts for a long time Cross-sectional structure and distribution of C elements formed on cut end after 18 months of outdoor exposure test (Thickness: 2.3mm, coating weight : 130/130g/m 2, chromate treatment : 50mg/m 2 ) Appearance of cut end after outdoor exposure test (Thickness : 3.2mm, coating weight : 150/150g/m 2, post-treatment : chromate 50mg/m 2 ) Nisshin Steel Quality Products 10

9 Quality characteristics Lapse of time before occurrence of red rust (hours) 14,000 12,000 10,000 8,000 6,000 4,000 2,000 Red rust occurrence after salt spray test 0 ZAM (Zn-6%Al-3%Mg alloy coated steel) Galvastar (55%Al-Zn alloy coated steel) Star Galfan (Zn-5%Al alloy coated steel) Paintite B (Zn) One-side coating weight (g/m 2 ) Appearances of specimens after salt spray test (Coating weight : 90g/m 2 (one side), untreated) Appearances of cut ends after salt spray test (Thickness : 3.2mm, coating weight : 120/120g/m 2, untreated) 11 Nisshin Steel Quality Products

10 Quality characteristics Appearances of cut end sections after atmospheric exposure test (Industrial area : Sakai-city, Osaka-prefecture, Japan, Coating mass : 90/90g/m 2, chromate treatment 50mg/m 2 ) Evaluation position Appearances of surface after outdoor exposure test lasting 2 years and 8 months Exposure location : Sakai coastal industrial region Projection welding Nisshin Steel Quality Products 12

11 Quality characteristics Appearances of 1-mm-thick processed part after outdoor exposure test for 90 days (Thickness 1mm, 180bending, thickness : 3.2mm, 120/120g/m 2, untreated) Appearances of 1-mm-thick processed part after salt spray test (Thickness 1mm, 180bending, thickness : 3.2mm, 120/120g/m 2, untreated) 13 Nisshin Steel Quality Products

12 Quality characteristics Corrosion loss (g/m 2 /day) Corrosion loss of three types of coated steel sheets in ammonia water ZAM Zn 55Al-Zn Discolaration (No red rust) Steel base dorrosion (red rust) Test piece Test solution Nisshin Steel Quality Products 14

13 Quality characteristics Corrosion loss (g/m 2 /day) Corrosion loss of four coated steel sheets in acidic and alkaline aqueous solutions ZAM (Zn-6%Al-3%Mg alloy coated steel) Galvastar (55%Al-Zn alloy coated steel) Star Galfan (Zn-5%Al alloy coated steel) Paintite B (Zn) ph Estimated number of years the material will last outdoors in a salt-damage region Number of years the material will last (years) ZAM Pre-coating Coating weight standard : 190C After-coating One-side plating coating weight (g/m 2 ) Type of coating ZAM Zn HDZ55 15 Nisshin Steel Quality Products

14 Quality characteristics Surface appearances (flat part) of two types of coated steel sheets in salt spray test Surface appearances (cut end) of two types of coated steel sheets in salt spray test Nisshin Steel Quality Products 16

Quality characteristics Corrosion loss of ZAM and post hot dip galvanized products in sulfur dioxide tests 700 Corrosion loss (g/m 2 ) 600 500 400 300 200 ZAM (Zn-6%Al-3%Mg alloy coated steel)

3mm, 560g/m 2 (one side)) Occurrence of red rust 100 0 100 200 300 400 500 Test duration (hr) Photo of appearances after 450 hours of sulfur dioxide test Corrosion loss (g/m 2 ) Corrosion loss of ZAM

15 Quality characteristics Corrosion loss of ZAM and post hot dip galvanized products in sulfur dioxide tests 700 Corrosion loss (g/m 2 ) ZAM (Zn-6%Al-3%Mg alloy coated steel) (Thickness 2.3mm, 90g/m 2 (one side)) Post hot dip galvanized product (HDZ55) (Thickness 2.3mm, 560g/m 2 (one side)) Occurrence of red rust Test duration (hr) Photo of appearances after 450 hours of sulfur dioxide test Corrosion loss (g/m 2 ) Corrosion loss of ZAM and post hot dip galvanized products in acid rain simulated combined-cycle corrosion test ZAM (Zn-6%Al-3%Mg alloy coated steel) (Thickness 2.3mm, 90g/m 2 (one side)) Post hot dip galvanized product (HDZ55) (Thickness 2.3mm, 560g/m 2 (one side)) cycle 17 Nisshin Steel Quality Products

16 Quality characteristics Appearances of surface of coated steel sheets after salt-spray test After combined-cycle corrosion test Nisshin Steel Quality Products 18

17 Quality characteristics Scratch resistance of various types of coated steel sheets (scratch test) 18 Radius of tip of test needle : 0.05mm Scratch load (gf) ZAM Galvastar (55%Al-Zn) Star Galfan (Zn-5%Al) Paintite B (Zn) 19 Nisshin Steel Quality Products

18 Quality characteristics Type Hot dip aluminum coated steel sheet 30/30 55%aluminum-zinc alloy coated steel sheet50/50 zinc-5%aluminum alloy coated steel sheet75/75 ZAM60/60 Hot dip galvanized steel sheet 40/40 Hot dip galvannealed steel sheet 40/40 Cold-rolled steel sheet Welding current ka Expulsion and Shear rupture surface flash Welding nugget diameter4sqrttt : thickness, pressure applied : 200kgf, electrification time :12cycles, thickness : 0.8mm, electrode shape : CF type, 6mm in diameter Example of proper welding conditions for various steel sheet (Figures in parentheses are the coating weight in g/m 2 ) Nisshin Steel Quality Products 20

19 Quality characteristics Appearances of surface of touch-up painted part after combined-cycle corrosion test (Thickness : 2.3mm, coating weight : 85g/m 2 (one side)) Surface appearances (cut end) of touch-up painted part after combined-cycle corrosion test (Thickness : 2.3mm, coating weight : 85g/m 2 (one side)) 21 Nisshin Steel Quality Products

20 Quality characteristics / / / Appearances of surface after test of painted material Material tested : untreated material for each coated steel sheets Painting pre-treatment : zinc phosphate treatment Paint : Acrylic resin, 1coat (No.1), Super Lac F-50 made by Nippon Paint Nisshin Steel Quality Products 22

21 Quality characteristics Appearances of processed part after 24 hours of humidity cabinet test (BBT) (90bend, bending radius : 1mm) Appearances after 72 hours of salt spray test (SST) 23 Nisshin Steel Quality Products

22 Quality characteristics Surface appearance of part Surface appearance of part Salt spray test (JIS Z2371) Surface appearance in salt spray test of flat part Top surface Bent section Side Nisshin Steel Quality Products 24

Certificates We have obtained an Architecture execution technology and technology examination certificate (examination certification No.

certificate No.0122) at the Civil Engineering Research Center.

23 Certificates We have obtained an Architecture execution technology and technology examination certificate (examination certification No.0004)at the Japan Architecture Center, which is a certification body of the Minister of Construction and aconstruction technology examination certificate (construction technology examination certificate No.0122) at the Civil Engineering Research Center. These awards attest that ZAMcan replace post hot dip galvanized products by having at least the equivalent corrosion resistance with only about one-sixth of the coating weight of post hot dip galvanized products,andcan be used in fields that heretofore have not been able to be handled with steel sheet made corrosionresistant by conventional post hot dip galvanized products. 25 Nisshin Steel Quality Products

Certification by the Minister of Land and Transportation has been obtained proclaiming compliance with the provisions of the Architecture Standards Law,

Under the provisions of thequality Assurance Law,certification by the Minister of Land and Transportation has been obtained for special evaluation methods

24 Certification by the Minister of Land and Transportation has been obtained proclaiming compliance with the provisions of the Architecture Standards Law, article 37, number 2. Under the provisions of thequality Assurance Law,certification by the Minister of Land and Transportation has been obtained for special evaluation methods for degradation measures classes (structures, etc.) to be displayed in accordance with the Japan housing performance labeling standards. With acquisition of this certification, this material can be performance-labeled under the housing performance labeling standards. Nisshin Steel Quality Products 26

25 Standards 27 Nisshin Steel Quality Products

26 Standards Nisshin Steel Quality Products 28

27 Standards MSM - ZAM product symbol Base sheet classification (H : hot, C : cold) Type and application Skin Post-treatment Coating weight labeling symbol MSM - HK400 - DA K27 MSM - CC - DZC Nisshin Steel Quality Products

28 Product availability Cold-rolled base metal 1,350 1,250 Hot-rolled base metal 1,350 Width (mm) 1,050 Width (mm) Thickness (mm) Thickness (mm) Examples of processed products Round pipes Lightweight H-shaped steel Corrugated sheet General structural material lightweight shaped steel Light grooved shaped steel Lip shaped steel Light mountain shaped steel Punching metal Special shaped steel Angular pipes Processing example at the customer Light Z-shaped steel Hat-shaped steel Special shaped steel Non-slip metal Pre-notch shaped steel Nisshin Steel Quality Products 30

29 Quality and quantity tables 31 Nisshin Steel Quality Products

30 Quality and quantity tables Nisshin Steel Quality Products 32

31 Precautions in use 33 Nisshin Steel Quality Products

32 Precautions in use An oxide film grows The structure and thickness of the oxide film change The changed of state of causes a change in the optical absorption coefficient The surface takes on a black appearance Nisshin Steel Quality Products 34

33 SPCC SPHC Processing Forming Hot dip galvanizing Surface finish Inspection Delivery Transport Transport Transport ZAM Processing Forming Inspection Delivery ZAM eliminates manufacturing steps Transport Cost reduction

Contents. Introduction. Coating layer : Fine ternary eutectic structure of Zn, Al, and Zn2Mg. 1 Nisshin Steel Quality Products

Contents. Introduction. Coating layer : Fine ternary eutectic structure of Zn, Al, and Zn2Mg. 1 Nisshin Steel Quality Products Introduction Contents 1 2 3 11 12 29 31 Cross-sectional structure of the coating layer Al 34 Zn 34 35 Coating layer Steel sheet Zn2Mg 37 Enlarged photo of eutectic structure Coating layer : Fine ternary