Welding Of Hardox - Australian Steel

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Welding of Hardox

Welding of HardoxThe unique performance of Hardox wear plate is combined withexceptional weldability. Any conventional welding methods canbe used for welding these steels to any type of weldable steel.This brochure aims to simplify, improve and boost the efficiencyof welding processes. It offers advice on i.e. preheat and interpasstemperatures, heat input, welding consumable, etc. It enables everyuser to gain full benefit of the unique properties of Hardox.CONTENTSImportant parameters affecting the welding result6Welding consumables6Requirements on hydrogen content of welding consumables7Stainless steel welding consumables8Shielding gas9Heat input10Cooling time t8/511Welding sequence and root opening size12Preheat and interpass temperatures12Hydrogen cracking13Preheat and interpass temperatures for Hardox13Interpass temperature15Attaining and measure the preheat temperature15Hard facing16Recommendations in order to minimize distortion17Welding on Hardox primer18Post weld heat treatment18

HardoxHardox is the brand name for wear resistant steels from SSAB. Hardox wear plates are widelyused in every climate, terrain and environment. Users all over the world put their trust inHardox when fighting wear. Hardox boosts performance and maximizes the uptime of applications like excavators, front wheel loaders, tipper bodies, mining trucks, conveyors, chutes,containers, crushers, fragmentizers, mixers, sieves, demolition tools, and barges. For workshops, it shortens lead times and cuts production costs.Table 1. Mechanical properties HardoxMechanical PropertiesSteel gradeHardness[HBW]Min - maxYieldstrength1(MPa)ElongationA5 1(%)ImpacttoughnessCVL1t 20 mmThickness(mm)Hardox HiTuf310 - 3708501495J -40 ºC40 - 160Hardox 400370 - 43010001045J -40 ºCHardox 450425 - 475130032Hardox 450425 - 4751100 - 130010Hardox 500450 - 5401250Hardox 550Hardox 600Hardox Extreme3 - 1300.7 – 2.1050J -40 ºC3 – 13035J -40 ºC4 - 80525 - 57530J -40 ºC10 - 50570 - 64020J -40 ºC8 - 5157 - 63 15J -40 ºC8 - 2031. Typical values2. A803. HRCTable 2. Chemical CompositionChemical Composition (ladle analysis)Steel gradeCMax %SiMax %MnMax %PMax %SMax %Hardox HiTuf0.20Hardox 40010.150.601.600.0200.0200.701.600.0250.010Hardox 45020.180.251.300.0150.004Hardox 4500.260.701.600.0250.010Hardox 5000.300.701.600.0200.010Hardox 5500.370.501.300.0200.010Hardox 6000.470.701.000.0150.010Hardox Extreme0.470.501.00.0150.0201. Max. for 20 mm plate thickness2. 0.7 – 2.10 mm plate thickness4CrMax %NiMax %MoMax %BMax 041.202.500.700.0051.202.500.800.005

Important parameters affecting thewelding resultClean the weld area to remove moisture, oil, corrosion or any impurities prior to welding. Inaddition to good welding hygiene, the following aspects are important:4 Choice of welding consumables4 Preheat and interpass temperatures4 Heat input4 Weld sequence and size of root gap in the jointWelding consumablesStrength of unalloyed and low-alloyed welding consumablesUnallaoyen and low alloyed consumables with maximum yield strength of 500 MPa is generally recommended for Hardox. Consumables of higher strength (Re max. 900 MPa) maybe used for Hardox 400 and 450 in the thickness range 0.7 – 6.0 mm. Low alloyed consumables result in higher hardness of the weld metal and thus reduced wear rate of the weldmetal. If the wear properties of the weld metal are essential, the top cap of the joint could bewelded with consumables used for hardfacing, see chapter “hard facing”. In addition, recommended consumables for Hardox steels and their designations according to AWS and

TIG AWS A5.18 ER70X AWS A5.28 ER80X EN ISO 636-A- W 42xx EN ISO 636-A- W 46xx Note: X stands for one or more characters 6. 7 Table 4: Recommended stainless steel consumables for Hardox steels Welding method AWS classification

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