REFERENCE STANDARD AISI DIN JIS DF-2 ARNE O1 1.2510 SKS 3 DF-3 O1 1.2510 SKS 3 XW-5 SVERKER 3 D6 (D3 (1.2436 (SKD 2 XW-10 RIGOR A2 1.2363 SKD 12 XW-41 SVERKER 21 D2 1.2379 SKD 11 XW-42 D2 1.2379 SKD 11 CARMO CALMAX CALDIE ASSAB 88 CARMO CALMAX CALDIE SLEIPNER ASP 23 VANADIS 23 (M3:2 1.3344 SKH 53 ASP 30 VANADIS 30 M3:2 + Co 1.3244 SKH 40 ASP 60 VANADIS 60 1.3241 VANADIS 4 EXTRA VANADIS 4 EXTRA VANADIS 6 VANADIS 6 VANADIS 10 VANADIS 10 VACRON 40 VANCRON 40 618 P20 Mod. 1.2738 618 HH P20 Mod. 1.2738 618 T P20 Mod. 1.2738 Mod. 718 SUPREME IMPAX SUPREME P20 Mod. 1.2738 718 HH IMPAX HH P20 Mod. 1.2738 NIMAX UNIMAX CORRAX NIMAX UNIMAX CORRAX STAVAX ESR STAVAX ESR 420 Mod. 1.2083 ESR SUS 420J2 MIRRAX ESR MIRRAX ESR 420 Mod. POLMAX ELMAX POLMAX ELMAX RAMAX LH RAMAX LH 420 F Mod. RAMAX HH RAMAX HH 420 F Mod. ROYALLOY PRODAX PT18 MMXL MM40 MOLDMAX SC MOLDMAX XL MOLDMAX HH ALVAR 14 ALVAR 14 1.2714 SKT 4 8407 2M ORVAR 2M H13 1.2344 SKD 61 8407 SUPREME ORVAR SUPREME H13 Premium 1.2344 ESR SKD 61 DIEVAR HOTVAR QRO 90 SUPREME DIEVAR HOTVAR QRO 90 SUPREME 705 4340 1.6582 SNCM8 709 4140 1.7225 SCM4 760 1050 1.1730 S50C This information is based on our present state of knowledge and is intended to provide general notes on our products and their uses. It should not therefore be construed as a warranty of specific properties of the products described or a warranty for fitness for a particular purpose. Edition 081112 2
General RoyAlloy is a patented free machining stainless holder steel, which is supplied in the prehardened condition. RoyAlloy is characterised by: Excellent machinability Improved dimensional stability Readily weldable Good corrosion resistance Greater ductility Good notch toughness Uniform hardness in all dimensions Better surface finish (as-rolled surface Good indentation resistance Applications Mould bases (holders/bolsters, cavity plates, support/backing plates, ejector plates Moulds requiring extensive machining and corrosion resistance Plastic and rubber moulds with low demands on polishability Dies for plastic extrusion Constructional parts Note: RoyAlloy is ultrasonic tested according to ASSAB specification. Typical analysis % C 0.05 Si 0.4 Mn 1.2 Cr 12.6 S 0.12 Standard specification Delivery condition None (Patented Hardened and tempered to 290-330 HB RoyAlloy is available in both flats and rounds. Colour code Alternate Yellow / Blue Properties Physical PROPERTIES Prehardened to 321 HB. Temperature 20 C 100 C 200 C Density kg/m 3 7 800-7 750 Modulus of elasticity MPa 200 000 _ 190 000 Coefficient of thermal expansion per C from 20 C - - 11.0 x 10-6 Thermal conductivity W/m C - 27.5 28 Specific heat J/kg C - 500 540 3
RoyAlloy is the preferred steel of choice of many mould makers and end users. RoyAlloy provides enhanced machinability, improved dimensional stability and superior surface finishes compared with 420F and 1.2085 type of steels. Mechanical properties Impact strength The energy absorption at impact testing depends on the test material (bar size and delivered hardness, test temperature and specimen (type, location, and orientation in the bar. Charpy V-notch impact toughness at room temperature tested in the LT direction. Hardness Impact energy J 321 HB 22 Tensile strength Approximate values. Longitudinal speciments tested at room temperature. Hardness Yield strength, Rp0.2 MPa Tensile strength, Rm MPa Elongation, A 5 % Reduction of Area, Z % 321 HB 890 1069 12 34 Compressive strength Approximate values. Hardness Compressive strength MPa 302 HB 760 Corrosion Resistance RoyAlloy was developed with a chemical composition adjusted to sufficiently provide good corrosion resistance during tool operation and storage. Tooling made from RoyAlloy will have good resistance to corrosion caused by humid working and storage conditions, and when moulding corrosive plastics under normal production conditions. 4
Machining recommendations The cutting data below are to be considered as guiding values and starting point for evaluation your own best practice. Milling Face and square shoulder milling Condition: Prehardened condition ~321 HB Turning Cutting data parameters Cutting speed (v c Feed (f mm/r Turning with carbide Rough turning Fine turning Turning with HSS Fine turning 130-190 190-250 25-28 0.2-0.4 0.05-0.2 0.05-0.3 Cutting data parameters Cutting speed (v c Feed (f z mm/tooth Depth of cut (a p mm Carbide designation ISO Rough milling Milling with carbide Fine milling 130-190 190-250 0.2-0.4 0.1-0.2 2-5 2 P20 - P40 Coated carbide P10 - P20 Coated carbide or cermet Depth of cut (a p mm 2-4 0.5-2 0.5-3 Carbide designation ISO P20 - P30 Coated carbide P10 - P20 Coated carbide or cerment - End milling High speed steel DRILLING High speed steel twist drill Drill diameter mm Cutting speed (v c Feed (f mm/r 5 17-19 * 0.05-0.10 5-10 17-19 * 0.10-0.20 10-15 17-19 * 0.20-0.25 15-20 17-19 * 0.25-0.30 Cutting data parameters Cutting speed (v c Feed (f z mm/tooth Carbide designation ISO Solid carbide Type of milling Carbide indexable insert High speed steel 80-120 120-170 35-40 1 0.006-0.20 2 0.06-0.20 2 0.01-0.35 2 - P15 - P40-1 For coated HSS end mill, v c ~ 60 66 2 Depending on radial depth of cut and cutter diameter * For coated HSS drill, v c = 29 31 Carbide drill GRINDING Wheel recommendation Cutting data parameters Indexable insert Type of drill Solid carbide Brazed carbide 1 Type of grinding Face grinding straight wheel Wheel recommendation A 46 HV Cutting speed (v c 215-240 110-130 70-110 Face grinding segments Cylindrical grinding A 36 GV A 60 KV Feed (f mm/r 0.05-0.15 2 0.10-0.25 2 0.15-0.25 2 Internal grinding Profile grinding A 60 JV A 120 JV 1 Drill with interntal cooling channels and brazed carbide tip 2 Depending on drill diameter 5
Heat treatment RoyAlloy is supplied in the prehardened condition with through-hardness of 290-330 HB. Each plate is carefully hardness-tested to ensure consistency. RoyAlloy is intended for use in prehardened condition (i.e., delivery condition, no further heat treatment is generally required. Further information For further information, i.e., steel selection, heat treatment, application and availability, please contact our ASSAB office* nearest to you. *See back cover page Welding RoyAlloy is readily weldable with RoyAlloy filler metal or several standard stainless filler metals, using TIG (GTAW and MMA (SMAW processes. Neither preheating nor postheating is necessary. Test had shown that RoyAlloy does not develop an overhardened heat-affected zone (HAZ around the weld deposit. This eliminates the concern of weldinduced cracking during repair or, subsequently, during service. For best results, use RoyAlloy welding electrodes. RoyAlloy electrodes provide an optimal match with the base metal in terms of chemical composition and mechanical properties. RoyAlloy remains dimensionally stable even after extensive machining of 152 x 711 x 813 mm. 0.15 mm distortion, corner to corner. 6
Relative comparison of ASSAB plastic mould steels RESISTANCE TO FAILURE MECHANISMS AND CRITICAL MOULD STEEL PROPERTIES ASSAB grade Plastic deformation Cracking Wear Corrosion Polishability Thermal conductivity Machinability 618 ROYALLOY 718 HH NIMAX CORRAX POLMAX MIRRAX ESR STAVAX ESR 8407 SUPREME UNIMAX ELMAX XW-10 7
ASSAB TOOL STEELS have been in Asia since 1945. Our customers associate ASSAB brand with tooling materials that are high in quality and consistency. The ASSAB sales companies and distributors offer you well assorted stocks in a number of places covering the Asia Pacific region. To further shorten the lead time, ASSAB will mill, grind, drill and even wire-cut the tool steel to meet your requirements. ASSAB also provides state-of-the-art vacuum heat treatment services to enhance the steel properties. Our engineers and metallurgists are always ready to assist you in your choice of the optimum steel grade and the best treament for each application. We always carry out material examinations at our local mini laboratories and at the central laboratory in Sweden. Our steel mill in Sweden, Uddeholm Tooling, is one of the few steelworks in the world that is dedicated to the manufacture of tool steels only. Uddeholm Tooling is certified to ISO 9001 and ISO 14001. Qingdao ASSAB Tooling (Qingdao Co., Ltd. Our forging press is one of the most modern of its kind in the world. Besides tool steels, the ASSAB services for tool makers include: Welding electrodes for repair welding of tools High strength aluminium for tooling purposes Copper alloys (e.g., beryllium copper for inserts in moulds Alloy machinery steels Cold rolled strip steels for saws, compressor valves, coater blades, etc High Performance Steels (HPS Sales office only Granshot