MARTENSITIC STAINLESS STEEL RWL-34

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1 MARTENSITIC STAINLESS STEEL RWL-34 RWL 34 is a Rapid Solidified Powder (RSP) Martensitic Stainless Steel, which is variation of the 420 martensitic stainless steel family with minimum 13 percent chromium with the addition of Molybdenum and Vanadium for improved corrosion resistance, hardness and strength. This alloy may be considered for a wide variety of applications where one or more of the following properties are important: High hardness after hardening and tempering Resistance to corrosion Ease of grinding and polishing The alloy represents an excellent combination of both corrosion resistance and hardenability. This combination of properties is the reason for its use in the cutlery industry. Some examples of its uses are in knifes, flatware cutlery, and other applications where corrosion resistance and hardness are important. For more information and general information see reference 1. Chemical Composition of Damasteel RWL-34 (% by weight) C Si Mn Cr Mo V RWL Mechanical Properties Annealed Damasteel RWL-34 (bar and plate), minimum values at 20 C of in the soft annealed condition Steel Grade Proof strength Rp0.2 MPa Tensile strength Rm MPa Elongation A5 % Impact Value KV J 93x,x 270 Max

2 Physical Properties The physical properties for Damasteel RWL-34 are as follows. Data according to EN Density Kg/dm to 7.8 Modulus Of Elasticity GPa 200 Poisson s Ratio 0.3 Thermal Conductivity W/m C 15 Heat Capacity J/kg C 460 Electrical Resistivity µωm 0.73 Corrosion Resistance This martensitic stainless steel has a moderate to good corrosion resistance and is therefore suitable for a wide range of applications. The inclusion of Molybdenum gives a RWL-34 with higher corrosion resistance. For a more detailed description of their corrosion resistance properties please refer to Sandvik Steel Corrosion Handbook, see ref 1. Fabrication Hot working The hot working temperature range is between 1,150 to 1,160 C (1,920 2,120 F) when compared to normal low alloy carbon steels, stainless steel has higher, almost doubled deformation stresses. Hand forging must therefore be performed on relatively small dimensions. Melting starts at 1,220 C which means that the material is sensitive to overheating. A good control of the heating temperature is needed. An electric or gas fired furnace is recommended. Long soaking times at temperatures above 850 C (1580 F) leads to scale formation. Slow cooling after the hot working prevents crack formation at the martensitic formation temperature of 200 C (400 F). Slow cooling using vermiculite or other heat insulating materials is recommended. Heat treatment Because of the risk of cracking, no grinding, cutting or machining should be done after hot working until the material is annealed. The material should be annealed for 5 hours at 750 -

3 780 C ( F). All martensitic material supplied from Damasteel is soft annealed to HV. Hardening For knife applications the following heat treatments can be recommended: Process Hardening Temperature (A) Tempering Temperature (T) Tempering Time Hardness (HRC) RWL ,050 C (1,920 F) 220 C (430 F) 2 h ,050 C (1,920 F) 175 C (345 F) 2 h ,080 C (1,980 F) 220 C (430 F) 2 h ,050 C (1,920 F) 175 C (345 F) 2 h ,100 C (2,010 F) 175 C (345 F) 2 h 64 The recommended heat treatment processes 4 and 5 include deep freezing (DF) at -80 C (-140 F). To ensure that best corrosion properties are achieved we recommend a low temperature tempering. The following time temperature curve can act as a guide, see figure 1. Figure1: Piece Hardening of Damasteel RWL 34 Stainless Steel 3.2 mm Thick

4 Cold Working Martensitic stainless steel does not cold work as well as the conventional austenitic stainless steels but can be formed and fabricated by a full range of cold working operation. The cold working ductility is good and any cold working operations will increase the strength and the hardness of the material. Blanking and punching can be done but other cold working operation should be avoided. Welding Martensitic stainless steel has the possibility of metallurgical change during cooling, which can lead to cracking. This can be avoided either by preheating or post-weld heat treatment. The grade can be welded by a full range of conventional welding methods. For best result use welding filler metals and several different companies that can supply them from stock. Machining As with the conventional austenitic stainless steels, the martensitic steels have some specific machinability properties, but are generally easier to machine Low tensile strength but a strong work hardening Tendencies for buildup of material on the tool edge Tough and stringy chips can be prevented by using chip curler tools Heavier feeds and slower speeds are used for machining the austenitic materials than are used for carbon steels. This reduces the work hardening and the tool edge build-up. For general guideline, see ref 2. Grinding and Polishing Normal grinding and polishing procedures for austenitic stainless can be used also for the martensitic stainless steel. Grinding wheel recommendation: Silicon Carbide, 46 grit, soft, open density, ceramic bonded. (C46J6V) Speed: 35 m/sec Feed: mm/stroke Speed of the work piece may be 1/60 of the grinding speed.

5 Abrasive Belt Grinding Application Belt type Grit Speed (m/s) Lubrication Plate, Strip, Bar or Wire Rough grinding Al 2 O Grease Fine grinding Polishing Cutlery and Jewelry Fine grinding Polishing Products Damasteel has a standard program and the latest information can be found at. The following products can be supplied. Reference Hot rolled plate Bar Rod Billet 1. Design guidelines for the selection and use of stainless steel, NiDi, Sandvik Steel Corrosion Handbook Stainless Steel, 1999 ISBN: Sandvik Coromant, Knowledge base, Information given in this datasheet may be subject to alterations without notice. Care has been taken to ensure that the contents of this publication are accurate but Damasteel and its affiliated companies to not accept responsibility for errors or for information which is found to be misleading. Suggestions for or descriptions of the end use or application of products or methods of working are for information only and Damasteel and its affiliated companies accept no liability in respect thereof. Before using products supplied or manufactured by the company the customer should satisfy themselves of their suitability.

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