1.4034

Steel PK4EX (Mat.No. 1.4034, DIN X46Cr13, AISI 420)
	Designation by Standards Brand Name Ravne No. Mat. No. DIN EN AISI PK4EX 902 1.4034 X46Cr13 X45Cr13 420 Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.47 max. 1.0 max. 1.0 13.50 - - - - - Description Steel 420 displays the best corrosion resistance in hardened condition with a surface polished to give a mirror finisih. Applications All kinds of cutting tools - knives, shears, surgical instruments, moulds for plastics production, as well as for surgical instruments and measuring gauges. Physical properties (avarage values) at ambient temperature Modulus of elasticity [103 x N/mm2]: 220 Density [g/cm3]: 7.73 Thermal conductivity [W/m.K]: 30.0 Electric resistivity [Ohm mm2/m]: 0.65 Specific heat capacity[J/g.K]: 0.46 Coefficient of Linear Thermal Expansion 10-6 oC-1 20-100oC 20-200oC 20-300oC 20-400oC 20-500oC 10.5 11.0 11.0 11.5 12.0 Modulus of Elasticity [103 N/mm2] 20oC 200oC 400oC 220 205 190 Continuous Cooling Transformation (CCT) Diagram Click the image to enlarge the diagram. Soft Annealing Heat to 730-780oC, cool slowly in furnace or air. Structure is ferrite with spherical carbides. Hardening Harden from a temperature of 980-1030oC followed by oilor air quenching. Hardness after quenching is 56 HRC. Tempering Tempering temperature: 100-200oC. Tempering Temperature (oC) vs. Hardness (HRC) 20oC 100oC 200oC 300oC 400oC 500oC 600oC 56 56 55 52 51 52 42 Tempering Diagram Click the image to enlarge the diagram. Forging Hot forming temperature: 1100-800oC. Machinability Similar to machining some of the high carbon tool steel, this alloy has tough, stringy chip build-up. Corrosion Resistance 420 is resistant to the atmosphere, fresh water, dilute acids and alkalis and fruit and vegetable juices. Welding Not commonly welded due to its air hardening characteristics. Welding may be performed after preheating to 149-204oC with post weld tempering at temperature for 2 hours . Filler metal should be AWS E/ER420. Note: The hot forming temperature stated should not be exceeed, as harmful grain coarsening and simultaneous formation of a carbide network along the grain boundaries will otherwise occur. This results in poor developmnet of hardness and a decline in toughness and elasticity in hardened condition. Forms manufactured: Please see the Dimensional Sales Program. Disclaimer The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available. Unless otherwise specified, registered trademarks are property of Metal Ravne company. Copyright 2011 by Metal Ravne. All rights reserved. Contact our Sales Office for more information.