Cold Work Tool Steels YSS Cold Work Tool Steels
Types of YSS cold work tool steels
Grade Chemical composition（％）
Color JIS equivalent AISI DIN WNr. C Si Mn Cr W Mo V Co Others
Free-cutting Original steel SLD-MAGIC High-performance cold work tool steel elements added
SLD SKD11 D2 1.2379 １ ．５ ０ ．３ ０ ．４ １ ２ ．０ ― ０ ．９ ０ ．３ ―
SLD10 8% Cr steel １ ．０ １ ．０ ０ ．４ ７ ．５ ― ２ ．８ ０ ．４ ―
ARK1 Original steel 0.7 0.3 ０ ．４ ７ ．５ ― １ ．０ ０ ．３ ― S：0.05
SGT SKS3 O1 1.2510 １ ．０ ０ ．３ １ ．０ ０ ．７ ０ ．７ ― ― ―
YCS3 SKS93 W5 １ ．０ ０ ．４ ０ ．９ ０ ．４ ― ― ― ― Cold work tool steels ACD37 Original steel A4 ０ ．９ ０ ．３ ２ ．０ １ ．１ ― １ ．３ ― ―
HMD5 Original steel ０ ．７ １ ．０ １ ．０ １ ．２ ― ０ ．２ ― ―
HI-PM MAGIC Original steel 40HRC pre-hardened steel
YXM1 SKH51 M2 1.3343 ０ ．９ ０ ．３ ０ ．４ ４ ．２ ６ ．５ ５ ．０ ２ ．０ ―
YXM4 SKH55 1.3243 ０ ．９ ０ ．３ ０ ．３ ４ ．２ ６ ．５ ５ ．3 1 ．9 5 ．０
YXR7 ０ ．８ ０ ．８ ０ ．３ ４ ．７ １ ．３ ５ ．５ １ ．３ ―
YXR3 Matrix high ０ ．６ １ ．５ ０ ．４ ４ ．３ ― ２ ．９ １ ．８ ― speed steel High speed tool steels YXR33 ０ ．５ ０ ．２ ０ ．５ ４ ．２ １ ．６ ２ ．０ １ ．２ ―
HAP5R ０ ．９ ０ ．８ ０ ．３ ４ ．３ ２ ．０ ３ ．０ ３ ．０ ― P/M high speed steel HAP10 M3：2 １ ．４ ０ ．６ ０ ．３ ５ ．０ ３ ．０ ６ ．０ ３ ．８ ―
HAP40 SKH40 1.3244 １ ．３ ０ ．３ ０ ．４ ４ ．２ ６ ．０ ５ ．０ ３ ．１ ８ ．０
P/M high HAP72 speed steel ２ ．１ ０ ．４ ０ ．３ ４ ．２ ９ ．５ ８ ．３ ５ ．０ ９ ．５ P/M High speed tool steels
Applications in cold work dies
Recommended YSS steel Standard Application hardness For mass production use (HRC) For general use For abrasion resistance For impact resistance
Blanking dies (small, progressive) 58-62 SLD, SLD-MAGIC, ARK1 HAP10, HAP40 YXM1, YXR7, HAP5R For general sheet use 55-60 HMD5 SLD, SLD-MAGIC ARK1 Blanking dies For general heavy plate use 58-62 SLD, SLD-MAGIC, ARK1 HAP10, HAP40 YXM1, YXR7, HAP5R For general sheet use 58-62 SLD SLD-MAGIC ARK1
Cold press die Cold press Bending and Swaging dies For general heavy plate use 58-62 SLD, SLD-MAGIC HAP40 YXM1 Male die 58-63 SLD, SLD-MAGIC YXM1, HAP40, YXM4 YXR7, YXR3, HAP10 Foging dies Female die 55-60 SLD, SLD-MAGIC, ARK1 YXM1, HAP10 YXR7, YXR3, HAP5R Male die 58-62 SLD, SLD-MAGIC HAP40, YXM4 YXM1, YXR7, YXR3 Heading dies Female die 55-60
Cold foging dies YSM SLD, SLD-MAGIC YXM1, YXR7, YXR3 Thread forming dies 58-64 SLD YXR7, YXM1, SLD10 Cold working rolls ≥80HS SLD, SLD-MAGIC YXM1, HAP40
Types of YSS cold work tool steels
Grade Characteristics Main Application
High-performance cold work tool steel attaining both Cold work dies for high-tensile steels, SUS, mass SLD-MAGIC extended die life and easy die fabrication. production, and general use. Cold work die steel with high abrasion resistance for general SLD use, excellent harden-ability and minimal quench stress. Cold work dies for general use, forming roll, shear blade.
Extreamly high hardness with excellent toughness in die SLD10 steels, 62-64HRC. Rolling dies.
Cold work die steel with high toughness and improved Dies for printed circuit board, die plates, stripper plates. ARK1 machinability. Cold work die steel with superior machinability for general use; SGT Special care is required for quenching large-size dies or wire Dies for deep drawing, gauges. electric discharge machining. Carbon tool steel for small production to be quenched in oil. YCS3 Press forming dies, jigs and tools, gauges. Improved SK105 grade for its hardenabillty. Cold work tool steels Vacuum quenched and air quenched steel. Improved SGT grade ACD37 for its hardenability and wire electric discharge machinability. Dies for deep drawing, gauges. Steel for ame hardening, resulting in high hardness and HMD5 small strain even with air quenched; good weldability. Dies for deep drawing.
HI-PM MAGIC 40HRC pre-hardened steel. Press forming dies for small production, jigs and tools.
High speed steel with high abrasion resistance and YXM1 toughness for general use. Cold forging dies, cold heading dies, slitter.
YXM4 High speed steel to prevent from abrasion, seizure and Cold forging dies, drawing dies. deformation under high pressure Matrix high speed steel, extremely highest toughness in Rolling dies, cold forging dies, roll, cold forging panches, YXR7 62-65HRC. Available for vacuum quenching. blanking panches.
YXR3 Matrix high speed steel for general use, extremely highest Dies to be used for cracking or chipping resistance. toughness in 58-61HRC. High speed tool steels YXR33 Matrix high speed steel highest toughness in high speed Cold forging dies, warm forging dies. steels. Standard hardness 54-58HRC.
HAP5R Extremely tough Powder Metallurgy process high speed steel. Cold forging dies, ne blanking dies.
HAP10 Extremely tough Powder Metallurgy process high speed steel. Cold forging dies, ne blanking dies.
HAP40 P/M high speed steel with high abrasion resistance and Press forming dies for mass production, roll. toughness for general use.
HAP72 P/M high speed steel with high hardness and highest Cold plastic working dies of long life, high performanced IC
P/M High speed tool steels abrasion resistance. molds.
Applications in cold work dies
Recommended YSS steel Standard Application hardness For mass production use (HRC) For general use For abrasion resistance For impact resistance
For sheet use 55-60 SLD, SLD-MAGIC, ARK1 YXM1, HAP40 YXR3, YXR7 Trimming dies For heavy plate use 50-55 DAC, DM Cold hobbing dies 55-60 SLD, SLD-MAGIC YXM1 Drawing dies 57-62 For plastic forming SLD, YXM1 HAP40 For sheet service 55-60 SLD, SLD-MAGIC, ARK1 YXM1, YXR7 YXR3 Shearing blade For medium plate (straight tooth) 53-58 SLD, SLD-MAGIC, ARK1, ACD8 YXR33 For heavy plate 48-53 DM, ACD8 Rotary shear slitters 54-60 SLD, SLD-MAGIC, ARK1 YXM1, HAP40 Thicknesses 50mm and under 50-55 DM, ACD8 Machine cutter Billet shear Thicknesses over 50mm 48-53 DAC, DM, ACD8 Gauges 60-64 SGT, ACD37, YCS3
Characteristics of YSS cold work tool steels Characteristics of steels
HAP72 : Standard steel (JIS equivalent)
: Original steel P/M high speed steel
YXM4 HAP40
Wear resistance HAP10 YXM1 Toughness HAP5R YXR7 SLD-MAGIC Matrix high speed steel SLD Excellent machinability YXR3 Toughness Air hardening steel ARK1 ACD37 Wear resistance, Strength YXR33 SGT HMD5
Flame hardening steel YCS3 For small production 40HRC pre-hardened steel HI-PM MAGIC
Toughness
Comparison of characteristics
Distortion by Standard Grade Wear Pressure Toughness Hardenability heat Machinability Weldability hardness resistance resistance treatment (HRC) SLD-MAGIC A A A－ A＋ A＋ A－ B 58 - 62 SLD A A B A＋ A＋ B C 57 - 63 SLD10 A－ A A－ A＋ A B－ C 59 - 65 ARK1 B＋ A A A＋ A A－ B 58 - 60 SGT C B＋ B C D A B 57 - 63 YCS3 D C C D D A＋ B 57 - 63 ACD37 B A－ B A＋ A A B 55 - 60 HMD5 C B B ─ ─ A A 55 - 60 HI-PM MAGIC D－ D A＋＋ ─ ─ A－ A＋ 40 YXM1 A A＋ A－ B B B C 58 - 64 YXM4 A＋＋ A＋ B B B B－ C 62 - 66 YXR7 A A＋ A A B B C 61 - 65 YXR3 A－ A A＋ B B B＋ C＋ 58 - 61 YXR33 B B＋ A＋＋ A B B＋ C＋ 54 - 58 HAP5R A A A＋ A A B C 58 - 62 HAP10 A＋ A＋ A A A B－ C 62 - 65 HAP40 A＋＋ A＋＋ A－ B A C＋ C 64 - 67 HAP72 A＋＋＋ A＋＋＋ C A－ A C－ D 68 - 71 (A is the uppermost level and + indicates higher performance)
Characteristics of YSS cold work tool steels Wear resistance
3 2 -7 Hardness Speci c abrasion volume（mm /mm ・mm）×10 Grade (HRC) 0.5 1.0 1.5 2.0 SLD-MAGIC 62.0 SLD 60.0 ARK1 59.0 SGT 60.0 YCS3 60.0 ACD37 60.0 YXM1 65.5 YXM4 66.0 YXR7 65.0 YXR3 59.0 YXR33 58.0 HAP5R 60.0 HAP10 64.0 Ohgoshi-method wear test Work material : SCM415 HAP40 67.0 Friction distance : 400m Friction speed : 0.76m/s HAP72 70.0 Load : 67N
Toughness
2 2 Bending strength (N/mm ) (kgf/mm ) 6,000 YXR3 600
ARK1 YXR7 HAP10 5,000 500 YXM1 HAP5R 4,000 HAP40 YXM4 400 SLD-MAGIC SLD 3,000 HAP72 SGT V60 300
Bending Strength V50 V40 2,000 Cemented carbide 200
1,000 100 56 58 60 62 64 66 68 70 72 Hardness（HRC）
2 2 Charpy impact value (J/cm ) (kgf-m/cm ) 200 20 YXR33
150 15
YXR3 HAP5R 100 10
ARK1 60 6
HAP10 SLD-MAGIC 40 HAP40 YXR7 4
10mm R-notch Charpy impact value SLD YXM1 YXM4 2 20 HAP72
0 0 54 56 58 60 62 64 66 68 70 Hardness（HRC）
（N/mm2） （kgf/mm2） （N/mm2） （kgf/mm2） 2,600 5,000 260 500 2,400 240
2,200 YXM1 220 SLD 2,000 SLD 200 4,000 Compressive Tensile strength 400 strength 1,800 180
SLD 1,600 160
1,400 0.2％Proof 140 3,000 0.2％Proof stress stress 300 XVC5 1,200 HAP40 120 YXM4 Tensile strength 1,000 100 Compressive strength SLD SLDSLD520○） YXM1 0.02％Proof 800 80 stress 2,000 YXR7 0.02％Proof 200 600 stress 60
YXR3 400 40
200 20
1,000 100 0 0 56 58 60 62 64 66 68 70 20 25 30 35 40 45 50 55 60 Hardness（HRC） Hardness（HRC）
Fatigue strength
（N/mm2） 1,400
HAP5R（62HRC）
1,200
HAP10（65HRC） YXR33（58HRC）
1,000 Stress
YXR7（62HRC） 800
SLD（58HRC） SLD-MAGIC （61HRC） YXM1（65HRC） Rotating bending fatigue test 600 104 105 106 107 Number of test cycle
Physical properties
Thermal expansion coefficient Thermal conductivity Young’s modulus Grade ×10−6/℃ 20 - 200℃ W/（m・K） 20℃ GPa
SLD-MAGIC 12.2 16.5 209 SLD 11.2 20.6 211 SGT 13.6 23.3 201 YCS3 14.3 25.9 207 YXM1 11.2 21.0 216 YXR3 11.3 18.7 212 HAP40 10.3 19.3 227
Heat treatment of YSS cold work tool steels
Hardening * Please refer to the standard heat-treatment condition of each grade for hardening and quenching condition.
Alloy tool steels, Carbon tool steels High speed tool steels
Quenching temperature Quenching temperature
750 - 800℃ 850℃
Holding time Holding time 500 - 600℃ T 500 - 600℃ T 450 - 550℃ Slow cooling Refer to Refer to (Y×R: rapid cooling) T×2 T×1 the table 30min/25mm T×2 the table 30min/25mm Tempering
About 80˚C First Second Austenitization First Second Austenitization pre-heating pre-heating pre-heating pre-heating
Holding time at austenitizing temperature Holding time at austenitizing temperature Thickness Thickness ≦15 25 50 75 100 125 150 200 300 Heating (mm) 5 10 20 30 40 50 60 70 80 90 (mm) furnace Time
Holding time (sec) 60 90 160 240 280 350 390 420 440 495 Holding time 15 25 40 50 60 65 70 80 100 Salt bath (min) Magni cation (Holding time/Thickness) ×12 ×9 ×8 ×8 ×7 ×7 ×6.5 ×6 ×5.5 ×5.5
Note: If you take preheating time, dipping time can be regarded as holding time.
Tempering
Tempering temperature Note1: This standard is applicable to tempering at 500ºC or more. When tempering at 250-500ºC, holding time must be increased to 1.5 times longer and at lower than 250ºC, 2 times longer than the standard. Note2: Tempering is required no less than two times for grades containing no cobalt and at least three times for grades containing cobalt to improve toughness when high temperature tempering is done. T Note3: Because toughness deteriorates, tempering higher than 600ºC must avoid for high-speed tool steels.
Refer to the table
Thickness (mm) ≦25 26 - 35 36 - 64 65 - 84 85 - 124 125 - 174 175 - 249 250 - 349 350 - 499
Holding time for tempering (h) 1 1.5 2 3 4 5 6 7 8
Annealing
1. All material is delivered as spheroidized annealed condition. 2. After reforging, spheroidizing is to be done before hardening. Please refer to the standard heat treatment conditions. 3. Stress relief annealing is to be done to remove stress caused by cold working such as drawing and rolling and to soften or reduce distortion caused by subsequent hardening. • Heating temperature : 650-700℃ • Holding time : 1h/25mm thickness
Heat treatment of YSS cold work tool steels Standard heat treatment conditions
Heating temperature Grade Hardness as Tempered hardness delivering (HRC) Annealing Hardening Tempering
SLD-MAGIC ≦255 1,010 -1,040 Air cool 480 - 530 or 150 - 250 Air cool ≧60 830 - 880 Slow cooling
SLD ≦248 1,000 -1,050 Air cool 480 - 530 or 150 - 200 Air cool ≧58 830 - 880 Slow cooling
SLD10 ≦248 1,020 -1,070 Air cool 520 - 550 Air cool ≧62 830 - 880 Slow cooling
ARK1 ≦248 1,010 -1,040 Air cool 480 - 530 or 150 - 250 Air cool ≧58 830 - 880 Slow cooling
SGT ≦217 800 - 850 Oil quench 150 - 200 Air cool ≧60 750 - 780 Slow cooling
YCS3 ≦212 790 - 850 Oil quench 150 - 200 Air cool ≧63 750 - 780 Slow cooling Cold work tool steels ACD37 ≦235 830 - 870 Air cool 150 - 200 Air cool ≧58 750 - 800 Slow cooling
HMD5 ≦235 Flame hardening 940 - 1100℃ ─ 825 - 875 Slow cooling （1）1,200 -1,240 Oil quench 550 - 570 Air cool ≧63 800 - 880 Slow cooling YXM1 ≦255 （2）1,160 -1,200 （1）1,230 -1,250 YXM4 Oil quench 560 - 580 Air cool ≧64 800 - 880 Slow cooling ≦277 （2）1,210 -1,230 （1）1,160 -1,180 YXR7 Oil quench 540 - 580 Air cool ≧62 800 - 880 Slow cooling ≦241 （2）1,120 -1,160 （1）1,150 -1,170 Oil quench 560 - 590 Air cool ≧57 800 - 880 Slow cooling YXR3 ≦241 （2）1,130 -1,150
High speed tool steels YXR33 ≦241 1,080 -1,140 Oil quench 550 - 600 Air cool ≧54 800 - 880 Slow cooling
HAP5R ≦269 1,120 -1,160 Oil quench 530 - 580 Air cool ≧58 820 - 870 Slow cooling （1）1,170 -1,190 Oil quench 550 - 580 Air cool ≧63 820 - 870 Slow cooling HAP10 ≦269 （2）1,120 -1,170 （1）1,190 -1,210 Oil quench 560 - 580 Air cool ≧66 820 - 870 Slow cooling HAP40 ≦277 （2）1,120 -1,190 HAP72 ≦352 1,180 -1,210 Oil quench 560 - 580 Air cool ≧68 820 - 870 Slow cooling P/M High speed tool steels
(1) Simple shape tools (2) Tools of complicated shape, requiring toughness in particular * Specimen size is 15mm squire or round by 20 mm long in accordance with JIS standard hardness test.
Hardenability
The maximum diameter of a round bar stock that obtains 60 HRC hardness at Half temperature time : Time required for cooling from quenching temperature to its center by quenching. {(quenching temperature + room temperature) / 2} 70
Cooling Air cool Oil quench 60 Grade YXR7（1,180℃） SGT（850℃） SLD-MAGIC φ170 φ550 50 YXM1（1,180℃） SLD φ170 φ550 SLD（1,025℃） ACD37 φ120 ─ 40 SGT φ８ φ7 0
YXM1 φ２０ φ180 （HRC） Hardness 30 YXR7 φ１７０ φ550 HAP10 ─ φ180 20 8φ※ 2 0φ※ 170φ※ 7 0φ☆ 180φ☆ 550φ☆ 10 1.0 2.0 3.0 4.0 6.0 8.0 10 20 30 40 60 80 100 200 400 600 800 1,000
Half temperature time (min) 〔※：Air cool, ☆：Oil quench〕
Heat treatment of YSS cold work tool steels
Quenched and tempered hardness curves SLD-MAGIC SLD SGT YCS3
70 70 70 70
1,050℃ Oil quench 820℃ Oil quench 65 65 1,050℃
1,030℃ 850℃ 1,025℃ 60 60 60 60
1,000℃ 800℃ 55 55
825℃ 1,010℃ Hardness （HRC） Hardness Hardness （HRC） Hardness （HRC） Hardness （HRC） Hardness 50 50 50 50
45 45
40 40 40 40 0 100 200 300 400 500 600 0 100 200 300 400 500 600 0 100 200 300 400 500 0 100 200 300 400 500 600 Tempering temperature（℃） Tempering temperature（℃） Tempering temperature（℃） Tempering temperature（℃）
YXM1 YXR7 YXR3 YXR33
68 68 66 62 1,240℃ 1,180℃ 1,220℃ 64 60 66 66 1,160℃ 62 58 1,140℃ 1,140℃ 1,200℃ 64 64 60 1,175℃ 56 1,150℃ 1,125℃ 1,120℃ 58 54 62 62 1,080℃ 56 52 1,180℃ 1,120℃ Hardness （HRC） Hardness （HRC） Hardness （HRC） Hardness （HRC） Hardness 60 60 54 50
1,160℃ 52 48 58 58 50 46
56 56 48 44 500 520 540 560 580 600 620 500 520 540 560 580 600 500 550 600 700 500 550 600 650
Tempering temperature（℃） Tempering temperature（℃） Tempering temperature（℃） Tempering temperature（℃）
HAP5R HAP10 HAP40 HAP72 68 70 70 72 1,200℃ 1,180℃ 66 68 1,180℃ 68 1,160℃ 1,140℃ 70 1,160℃ 1,120℃ 1,160℃ 1,140℃ 66 1,180℃ 64 1,160℃ 1,120℃ 66 68 1,200℃ 1,140℃ 62 64 64 1,220℃ 66 60 62 62 Hardness （HRC） Hardness （HRC） Hardness （HRC） Hardness Hardness （HRC） Hardness 64 58 1,120℃ 60 60
62 56 58 58
54 56 56 60 500 520 540 560 580 600 520 540 560 580 600 520 540 560 580 600 500 520 540 560 580 600 Tempering temperature（℃） Tempering temperature（℃） Tempering temperature（℃） Tempering temperature（℃）
Heat treatment of YSS cold work tool steels Dimensional change after heat treatment Dimensional changes after heat treatment of cold dies steel
0.10 SLD longitudinal direction Radial direction 0.25 SLD-MAGIC longitudinal 0.05 direction Longitudinal direction 0.20
0.00 SLD-MAGIC width direction 0.15
－ 0.05 0.10 SLD width direction
Dimensional changes rate (%) － 0.10 0.05 Dimensional changes rate (%)
－ 0.15 0 0 100 200 300 400 500 600 SLD-MAGIC SLD SGT YCS3 YXM1 YXR3 HAP40 Tempering temperature 2hr, twice (℃). Specimen： 50T×100W×200L Quenching temperature 1,030℃ 1,030℃ 825℃ 800℃ 1,200℃ 1,150℃ 1,130℃ Rolling direction 200L Tempening 500℃ 510℃ 200℃ 200℃ 575℃ 570℃ 570℃ temperature Quenching ： 1030℃ Tempering ： 2hr., twice
The retained austenite
30 YXM1 1260℃ quenching
25 SLD-MAGIC 1030℃ quenching 20 SLD 1030℃ quenching
15
10 SGT 825℃ oil quenching 5
0
Volume ratio of retained austenite (%) 0 100 200 300 400 500 600 Tempering temperature, twice（℃）
Secular change and stabilizing treatment Secular change and sub-zero treatment on cold work tool steel
0.10 0.10 Stabilizing： 400℃×2hr. Stabilizing： 400℃×2hr.
0.08 0.08 SLD Tempering only Tempering only 0.06 0.06 Sub-zero treatment (−75ºC) -tempering SLD-MAGIC 0.04 0.04 Tempering only
0.02 0.02
0.00 0.00
SLD-MAGIC SLD Sub-zero treatment(−75ºC) -tempering+stabilizing Tempering + stabilizing Tempering + stabilizing －0.02 －0.02 Dimentional change ratio after 2 months from heat treatment (%) 460 480 500 520 540 Dimentional change ratio after 2 months from heat treatment (%) 460 480 500 520 540
Tempering temperature 2hr, twice（℃） Tempering temperature 2hr, twice（℃）
Improvement processes of YSS cold work tool steels in terms of hardness and dies for various applications Flowchart to improve die life of cold work tool steels
Countermeasure SLD-MAGIC YXM1 HAP40 HAP72 for wear （61～62） （62） （64） （68）
YXR7 （62） HAP10 Countermeasure for SLD-MAGIC （64） HAP40 HAP72 plastic deformation （ ） （ ） （61～62） YXR7 66 68 YXM1 （64） （62） SLD （60） In case sinking and wear YXR3 resitance is not at issue YXR3 YXR33 （60） in mold life （58） （58） Countermeasure for crack YXR7 In case sinking and wear （60） resistance is critical HAP5R in mold life SLD-MAGIC （60） （60）
SLD-MAGIC YXR3 YXR33 HAP5R Low cycle （60） （60） （57） （60） Countermeasure for fatigue failure
High cycle SLD-MAGIC YXR7 HAP40 （60） （62～64） （64）
Remark : (HRC: rough standard hardness)
Flowchart to reduce die cost of cold work tool steels
Reduction of SLD-MAGIC ARK1 machining cost （60） （59） SLD （60）
Reduction of heat SLD-MAGIC HMD5 HI-PM MAGIC treatment cost （60） （60） （40）
Decrease of dimensional Flame hardening Pre-hardened changes after heat treatment
Isotropy tool steels are so named becase the difference in mechanical properties between its longitudinal (forging or rolling direction) and transverse directions is reduced, thus overcoming a weak point of ordinarily processed steels. This technological concept, which is highly evaluated by users of tool steels, is applied for the production of all our steels and contributes signi cantly to stabilizing their characteristics and enhance their service life.
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