1 , S-MAGIC, SLD, ARK1 and YSS are registered trademarks of Hitachi Metals, Ltd. Head Office Head Office Other Office N SEAVANS North Building, 1-2-1, Shibaura, Minato-ku, Tokyo , Japan High-Grade Metals Company 2 Manhattanville Road, Suite 31, Purchase, NY 1577, U.S.A. Chicago, Detroit, Pittsburgh, San Jone, Novi Michigan Tel Fax Tel Fax Tel Fax Tel Fax Tel Fax Tel Fax Tel Fax Tel Fax Tel Fax Tel Fax Tel Fax Tel Fax The characteristics listed on this catalog are representative values and they do not guarantee the quality of the product. This catalog and its contents are subject to change without notice. Do not duplicate this catalog without a permission from Hitachi Metals,Ltd. Please contact a representative of our Specialty Steel Division if there are any questions or problems. High Performance Cold Work Tool Steel The die steel seeking improvement of mold lifespan and total cost reduction. Head Office Other Office Immermannstrasse 14-16,421 Duesseldorf, Germany London, Milano, Paris Tel Fax Gul Avenue, Singapore Tel Fax Head Office Cha Shan Town, Dong Guan City, 52238, China Tel Fax Shanghai Branch No.155 jiu yuan road, Qingpu industrial zone, Tel Qingpu District, Shanghai, 21712, China Fax Tianjin Jinnan Branch No.11,Jianshe 4th Branch Road, Balitai Town, Jinnan District,Tianjin, 335,China Tel /312 Fax Dalian Branch 3 # -2, Koushin Mould Industrial Park B-1-1-1F. Tel /122 T. Z. Dalian, 1166, China Fax Xing lin Street, Suzhou Industrial Park, Jiangsu Province, 21527, China Tel Fax Tel Fax Our address and contact indicated in this catalog are those as of October 213. If you cannot put a call through, please contact our Corporate Communications Office. in Tokyo below. Hitachi Metals, Ltd. Corporate Communiations Office Tel: Fax: HL-Y48J,E-I 2131T-MT3 Hitachi Metals, Ltd.
2 is the high performance cold work die steel attaining both improved mold lifespan and easy mold fabrication. SLD - MAGIC 62HRC35% Features Wear resistance High hardness of 62HRC improves wear resistance by approximately 35%** P.4 CVD3% Surface treatment Adherence between the coating layer and steel after surface treatment (CVD and other methods) is improved by approximately 3%** P.5 Winner of The Best 1 New Product Prize of Nikkan Kogyo Shimbun for 26, Japan Minister of Economy, Trade and lndustry Award for 27, Japan 4% Heat treatment Minimal deformation during heat treatment for a reduction of approximately 4%** in dimensional changes P.6 MMaterials Magic AAdvanced GGratifying IInnovative CCold work die steel 35% Machinability Machinability improved by approximately 35%** P.9 8%Cr: SLD 8 **Hitachi Metals comparison: Comparison against 8%Cr steel (Hitachi Metals product name:sld 8), a modified steel of Concept Good Relationship Grade Comparison of Properties 8%Cr 8%Cr Steel 1%Cr 1%Cr Steel HRC Hardness Wear resistance Wear resistance SLD 8%Cr 1%Cr Machinability ARK1 Good Effect Reduces reworking man-hours through minimal heat and surface treatment deformations. Prevents scuffing of high-tensile steels during bending and drawing. Improve mold lifespan. Shortens mold processing time via enhanced machinability. Reduces direct purchasing cost by improvement lifespan of cutting tool. Surface treatment*** Toughness Machinability Dimensional change by heat treatment Weldability TDCVD ***Surface treatment properties are based on adherence between the coating layer and steel after surface treatment. 8%Cr1%Cr 8%Cr steel and 1%Cr steel offer improved machinability for better processing that reduces the volume of hard carbides within steel, but are inferior to in terms of wear resistance and galling. 2 3
3 Wear resistance Surface treatment increases wear resistance by approx. 35% compared with 8%Cr steel due to the control of carbide morphology. Ohgoshi-method wear test 8%Cr 1%Cr 62HRC 62.5HRC 6HRC 6HRC Wear resistance is improved (mm 3 /mmmm) 2 Specific wear volume Work materialscm415 Friction distance4m Friction speed.76m/s Load67N can be treated with hard coating (CVD, TD treatment etc.) under the same conditions as Coating Layer by CVD method 8m Thickness 5m Scuffing resistance shows less scuffing on Hat Testing simulating practical mold wear phenomena. Bead Holding Pressure Scuffing Test Initiation point and direction of scuffing Punch Die Work Schematic of test conditions Toughness is superior to in toughness. It can be used as a countermeasure to chipping and cracking with low temp. tempering. 8%Cr 1%Cr Scuffing Observation Mold surface Observation direction Work Surface Scuffing Test Conditions Press: 8ton Cranck Press Velocity V: 475spm(19.236m/min) Holding Pressure Ps: 2.4ton/cm 2 Length of Stroke: 6mm Lubricant: Anti-rustoil applied and wiped away Work: High-tensile-strength steel (59MPa) Thickness 1.6mm (No plating) Surface Roughness of the mold: Polished by #1 (Ra=.4m) 1R-notched Charpy impact value Low temp. tempering High temp. tempering Toughness is higher (J/cm 2 ) 1R-notched Charpy impact value Less scuffing Scuffing Appearance of work Sample Low temp.2 C High temp C shows improved adherence between the coating layer and steel after 3-time surface treatment by approx. 3% when compared with 8%Cr steel, due to optimum alloy design. Adherence between the coating layer and steel after 3-time CVD treatment Scratch test 8%Cr 1%Cr Fatigue strength shows improved fatigue strength in comparison to due to the control of carbide morphologies. Improved adherence Physical Properties Thermal expansion coefficient 1-6 / Specific gravity Transformation temperature 21 Annealed Ac1 22 Quenched and tempered Ms 1 Index (=1) (Index) Adherence Rotating bending fatigue test N/mm (61HRC) 9 (6HRC) 8 8%Cr (62HRC) Cycles Stress Thermal conductivity W/mK Young's modulus GPa Room temperature 4 5
4 Heat Treatment Heat Treatment It is possible to heat treat under the same conditions as. It is possible to obtain maximum hardness (6~62HRC) with tempering at around 5 C where dimensional change is near to zero, achieving both high hardness and less dimensional change. Secular change of after high temp. tempering is almost equivalent to that of, and smaller than 8%Cr steel. It is possible to reduce secular change via low temp. tempering, sub-zero treatment or stabilizing*. * Heat treatment process to add middle temp. tempering after high temp. tempering for the purpose of reducing seculer distortion. Size of test pieces: 45T 9W 2L Austenitizing: 13 C Low temp. tempering: 18 C 2times High temp. tempering: 52 C 2times Measure: 2mm direction Dimensional change after 6 months posterior heat treatment Standard Heat Treatment Conditions Annealed Hardness 8%Cr 1%Cr Hardening Tempering Low temp. tempering High temp. tempering HRC Hardness Quenched and tempered hardness Hardness (HRC) Dimensional change after heat treatment Dimensional change rate (%) Quenching *A Quenching Secular change / Dimensional growth Dimensional change rate *A *A: Minor dimensional change*b: Minor dimensional change with maximum hardness *B (%) shows stable both high hardness and very little dimentional change at around hardening temperature. To add subzero treatment, can achieve high hardness (62HRC) by both high and low temp. tempering. To combine subzero and stabilizing treatment is very effective for reducing secular distortion. shows almost the same decomposition behavior of the retained austenite, as that of conventional. shows smaller in dimentional change difference in the longitudinal, width and thickness directions, compared to or 8%Cr steels. The difference of quenching temperature Hardness (HRC) As quenched Secular change / Dimensional change 8%Cr 1%Cr The subzero treatment and hardness Hardness (HRC) The retained austenite (%) 23 2 The retained austenite Quenching subzero with subzero without subzero Small difference between L and W direction Upper L (Longitudinal) Lower W (Width) Dimensional change ratio (%) 6 7
5 Heat Treatment Machinability shows narrow deviation of dimensional changes by heat treatment, as a result, the better dimensional tolerance can be attained. For example, in case of separation type molds, mold set up time was largely decreased because of narrow dimensional deviation. Dimensional chauge by Heat Treatment (%) Deviation comparison of dimensional changes of actual mold after heat treatment..21 Standard deviation: Standard deviation:.42 7 Number of measurement: 7 7 Number of measurement: Narrow deviation Wide deviation frequency Example of dimensional change for insert type mold. Grade mm mm % Direction Original dimension Dimensional Dimensional change change ratio W L W L frequency W Width Mold set up time 46 (Index) L Longitudinal 54% reduction of mold ajusting time after heat treatment improves machinability on face mill by over twice that of and by approx. 35% compared to 8%Cr steel. It also demonstrates superior machinability using other tools. Mold processing time is expected shorten due to good machinability. The direct purchasing cost of tools is expected reduce by improvement lifespan of cutting tools. 8%Cr 1%Cr 8%Cr 1%Cr 8%Cr 1%Cr 125 Face Mill Machinability is improved Tool Wear (mm) End Mill Tool Wear (mm) Drill (mm) Tool Wear WorkAnnealed condition ToolCoated carbide chip1chip only Cutting speed12m/mindry Feed.13mm/blade Depth of cut2 Z 9 W mm Cutting distance4m WorkAnnealed condition ToolEnd mill8co-hss Cutting speed3m/mindown-cutwet Feed.5mm/tooth Depth of cut15 Z.5 W mm Cutting distance5m WorkAnnealed condition ToolDrill5Co-HSS Cutting speed2m/min, Wet Feed.5mm/rev Depth of hole25mm, 2Holes Weldability shows lower susceptibility of cracking by welding compared with and others. Grindability Grindability of is better than those of and 1%Cr steel, and almost equivalleut to 8%Cr steel. Pre-heating temperture 8%Cr 1%Cr ranking of anti-cracking Grindability comparison as a function of diffenent grinding wheels 8%Cr 1%Cr A C B C Welding rodskd61 4.mm Welding current13aac 3 Cracking occured at 3rd layer 3 No cracking at 3rd layer a b c Grinding Wheel a: Alumina Single Crystal b: Alumina c: Alumina + Other ceramics Grindability 592L 33m/s.33m/s 5m/pass 5mm/ 1.1mm Grinding test conditions Work 592L (Heat treated condition) Machine: Reciprocal Type Grinding Wheel Grinding Conditions Wet Traverse Grinding Velocity of Wheel 33m/sec Table velocity.33m/sec Undercut 5m/pass Cross Field 5mm/lap Spark out 1lap Total undercut.1mm Grinding ratio Ground off amount/wear of wheel Grinding ratio is higher the better can enhance tool lives because of lower cutting tool temperatures. Color of chips Gold Blue (Temperd color) 8%Cr 1%Cr Cutting tool temperature comparison Temperature at tool surface High feed cutter (mm) Tool Wear CEPR6886NT TiAIN (ultrafine particle WC) 8%Cr 1%Cr n=3981min -1 (V=1m/min) Ap=12mm Ae=.4mm OH=25mm Dry with Air Blow WorkAnnealed condition ToolCoated carbide chip Cutting speed15m/mindry Feed1.3mm/tooth Depth of cut1mm Cutting distance6m KITAMURA M/C 11kw Cutting Length m 8 9
6 Application Examples By achieving both improved mold lifespan and easy mold fabrication, will contribute to reducing total cost and shortening delivery times of the automobile and mold industries. Application Examples 1 Bending die for automotive parts 6 Die for hydroforming 2 automotive parts 7 3 electrical appliances 8 4 electrical appliances 9 5 electrical appliances