WIXLIB

HOT DIPGALVANIZEDSTEELAuto Body PanelsAppliancesHVACAgricultural EquipmentTransportationHOT DIP GALVANIZED STEEL, known as ZINCGRIP Steel,is continuously coated on both sides with a zinc coating.The hot dip process, pioneered by AK Steel, provides a tightmetallurgical bond between the steel and the coating. Thisprocess results in a material with the strength and formabilityof steel plus the corrosion protection of zinc. Zinc protects thebase metal by providing a barrier to corrosive elements and alsoby the sacrificial nature of the coating.ZINCGRIP Steel is available with special surface finishes,tailored for specific applications, and in a variety of base metalgrades and coating weights. ZINCGRIP Steel is widely used inmany applications in the automotive, appliance, construction,HVAC, and other industries.

HOT DIP GALVANIZED STEELProduct DescriptionPRODUCT FEATURESCORROSION RESISTANCEThe zinc coating protects the base metal by providing a barrier to corrosiveelements and also by the sacrificial nature of the coating. Ultimate service lifedepends on coating thickness and the severity of the environment.TABLE 1 – COATING WEIGHTCoating Weight Min.CoatingDesignationoz./ft.g/m22Triple Spot Designation (Total Both Sides)EXCELLENT SURFACE APPEARANCEZINCGRIP Steel is available as EXTRASMOOTH or ULTRASMOOTH for themost demanding surface critical applications.G01No Min.No Min.G300.3092G400.40122FORMABILITYZINCGRIP Steel can be used to produce parts containing simple bends to partswith deep drawing RIP Steel is readily paintable provided proper pre-treatment is P Steel can be joined using a variety of accepted welding COATING CHARACTERISTICSThe hot dip coating process assures a tightly adherent, uniform coating of zincon both sides of the product. A thin alloy layer readily permits normal fabricationpractices without incurring significant coating damage.Hot dip coatings are specified in a wide range of coating weight categories asshown in Table 1. The differences in designation are explained by the diagramin Figure 1. A schematic of the coating cross section is shown in Figure 2. Forcoating weights not listed, contact your AK Steel sales representative.SURFACE PROTECTION AND LUBRICATIONTo prevent staining in transit and storage, it is recommended that ZINCGRIPSteel be supplied with a rust-preventive oil. A chemical passivating treatmentcan also be supplied. A chemical treatment is not recommended if the productwill be painted unless proper surface preparations are taken. Specific chemicaltreatment requirements (such as RoHS) must be clearly indicated and reviewed.ZINCGRIP Steel can be supplied with a zinc-phosphate coating calledPAINTGRIP for applications that require paint pre-treatment.G235Single Spot Designation (Single 98Note: 1 oz./ft.2 coating weight 0.0017 in. coating thickness7.14 g/m2 coating mass 1 µm coating thicknessFor other coating weights, please inquire.FIGURE 1 – COATING DESIGNATIONMin TST* oz./ft.2(102)Total both sidesG90G Pure ZincA Zinc-Iron AlloyEnglish DesignationMin SST* g/m2 per sideUnexposed sideMin SST g/m2 per sideExposed side if applicable70G70GEG Pure ZincA Zinc-Iron AlloyMetric DesignationE ExposedU Unexposed*TST/SST Triple Spot Test/Single Spot Test as defined by ASTM A924.FIGURE 2 – COATING CROSS SECTIONZINC COATINGSTEEL BASE METALLayers not shown to scale.1

HOT DIP GALVANIZED STEELProduct DescriptionSURFACE/FINISHZINCGRIP Steel is available in three types of surface appearances.Minimized Spangle is ZINCGRIP Steel that, through control of the coating bathchemistry, has no visible spangle. It is available with the full range of coatingweights and base metal qualities. It is used in noncritical surface applicationsand is not guaranteed to be free from stretcher strain, luder lines, or fluting.ZINCGRIP EXTRASMOOTH Steel is a product that is produced by skin passingthe coated sheet to smooth the surface and impart resistance to stretcherstrain and fluting. It is suited for applications where appearance is important.EXTRASMOOTH is recommended for coil coated applications.ZINCGRIP ULTRASMOOTH Steel is a skin pass product with superior surfaceappearance, uniformity and consistency. Applications would include morestringent surface quality requirements.AK Steel utilizes nitrogen finishing to control coating weight and smooth thecoating. This technology, along with coating bath chemistry control, combine toproduce a superior zinc coated product.EXTRA DEEP DRAWING STEEL (EDDS)Extra Deep Drawing Steel or Extra Deep Drawing Steel Plus (EDDS ) should beordered for the most demanding forming applications. These steels, also knownas Interstitial Free (I-F) steel, are produced from vacuum degassed less than0.010%C, stabilized grades. EDDS has the lowest carbon content availableand has been specially formulated to be AK Steel’s most ductile product.For high strength applications, ZINCGRIP Steel is available asStructural Steel (SS) or High Strength Low Alloy Steel (HSLAS).Bake Hardenable (BH), Dent Resistant (DR) and Dual Phase (DP) Steels arealso available.Typical mechanical properties are shown in Tables 2 – 5.SPECIFICATIONSZINCGRIP Steels are produced in conformance to the following specifications:ASTM A653Base metal chemistry, grades, and coatingsASTM A755Hot dip coil-coated for exposed building productsRegular spangle product is not available from AK Steel.ASTM A924General requirements and tolerancesFORMABILITY AND MECHANICAL PROPERTIESThe formability of all steel products is a result of the interaction of manyvariables. These variables include: the mechanical properties of the steel, theforming system (tooling) used to manufacture parts, and the lubrication usedduring forming. Of these three, AK Steel can directly affect the mechanicalproperties of the steel. Tight control over chemical composition, hot rollingparameters, the amount of cold reduction, in-line annealing time andtemperature, and the amount of additional processing allow the production ofhigh quality ZINCGRIP Steel to meet our customers requirements.ASTM A929Corrugated steel pipeAASHTO M218Galvanized culvert sheetsSAE J2340RA 830COMMERCIAL STEEL (CS) AND FORMING STEEL (FS)Commercial Steel Type B (CS Type B) and Forming Steel Type B (FS Type B)should be used for moderate forming or bending applications. These productsare produced from aluminum-killed continuously cast slabs and unlessotherwise specified, have a carbon content of 0.02 – 0.15%C and0.02 – 0.10%C respectively. To prevent the occurrence of fluting or stretcherstrains during forming or processing, both products must be ordered asEXTRASMOOTH. These products are subject to aging and the temper rollingeffect is temporary.DEEP DRAWING STEEL (DDS)For more stringent forming applications, Deep Drawing Steel should be ordered.Deep Drawing Steel has a controlled carbon content less than 0.06%C.Interstitial Free (I-F) steel may be supplied at the manufacturer’s discretionunless low carbon (non I-F) is specifically requested at the time of purchase.For any specifications not listed here, contact your AK Steel sales representative.OUTSIDE PROCESSINGTailored blanks, tension leveling, re-squaring, slitting, cut-to-length, andcoil coating are just some of the services AK Steel can provide througharrangements with outside processors.TECHNICAL ASSISTANCEAK Steel’s technical representatives can provide you with more detailedinformation concerning this product. They also are available to assist you inreviewing any welding, forming, painting, or other material selection issues.MILL LIMITS*ZINCGRIP Steel is available in thicknesses from 0.018 – 0.134 in.(0.46 – 3.40 mm), and widths up to 80 in. (2032 mm), depending on thedimensions and product quality. For sizes outside these limits, please contactyour AK Steel sales representative.The standard inner diameter of ZINCGRIP coils is 24 in. (609 mm).*Please inquire for Hot Rolled substrate capability.2

HOT DIP GALVANIZED STEELTablesTABLE 2 – TYPICAL MECHANICAL PROPERTIES – STANDARD GRADESQuality DesignationCommercial Steel(CS Type B)Forming Steel Type B(FS Type B)Deep Drawing Steel(DDS) Low CarbonDeep Drawing Steel (DDS)Ultra-Low CarbonDescriptionMay be moderately formed.A specimen cut in any direction canbe bent flat on itself without cracking.YSUTSksi.MPaksi.MPaMin.Elong. 231.62214843290460.241.7May be used in drawing applications.Extra Deep Drawing Steel(EDDS)Interstitial Free (I-F) steels are made byadding titanium and/or niobium to theExtra Deep Drawing Steel Plus molten steel after vacuum degassingand offer excellent drawability.(EDDS )Typical properties produced by AK Steel for these grades.Commercial Steel, Deep Drawing Steel, and Extra Deep Drawing Steel are designations described in the ASTM specifications for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) bythe Hot Dip Process A653/A653M. Each of the steel sheet designations is associated with unique requirements for chemical composition and with non-mandatory, typical mechanical properties. All properties aretested per ASTM A370.TABLE 3 – ASTM SPECIFIED PROPERTIES – HIGHER STRENGTH GRADESStructural Steel (SS)High Strength Low Alloy Steel(HSLAS)Min. YSMin. Tensile Strengthksi.MPaksi.MPaMin.Elong. %33 (230)33230453102037 (255)37255523601840 (275)40275553801650 Class 150340654501280 Class 1*8053082565–404027550340225050340604102050 (HSLAS-F)50340604102255 Class 25538065448186060420704821670* (HSLAS-F)70480805501780* (HSLAS-F)805509062014Quality DesignationDescription*AK Steel Hot Rolled substrate only.The following qualities are available to various customer or industrial requirements.Bake Hardenable (BH) grades offer goodformability with increased strength from workhardening and susequent paint/bake cycle.Dent Resistant (DR) grades offer goodformability with increased strengthfrom a high work hardening rate.BH 180BH 210BH 220BH 240BH 250BH 260DR 180DR 190DR 210Dual Phase (DP)DP 590DP 600DP 780DP 800DP 980For strength levels not listed, please inquire.3

HOT DIP GALVANIZED STEELTablesTABLE 4 – SAE SPECIFIED PROPERTIES NOT COVERED BY ASTMQuality DesignationDescriptionMin. YSMin. UTSksi.MPaksi.MPaMin.Elong. %High Strength Low Alloy Steel (HSLAS)045XLK453105538022Recovery Annealed 830SAE J2340 Type 830R–830–8602TABLE 5 – AASHTO SPECIFIED PROPERTIESQuality DesignationAASHTO M218DescriptionCSPMin. YSMin. UTSksi.MPaksi.MPaMin.Elong. %332304531020TABLE 6 – ENGINEERING PROPERTIESYoung’s Modulus of Elasticity200 x 103 MPa at 20 CDensity7.87 g/cm3 at 20 CCoefficient of Thermal ExpansionLow-Carbon/HSLAS: 12.4 μm/m/ C in 20 – 100 C rangeI-F Steel:12.9 μm/m/ C in 20 – 100 C rangeThermal ConductivityLow-Carbon/HSLAS: 89 W/m C at 20 CI-F Steel:93 W/m C at 20 CSpecific Heat481 J/kg/ C in 50 – 100 C rangeElectrical Resistivity0.142 μΩ m at 20 C4