DataTechnical Data

Chemical composition and heat treatment temperature by each kind of special steel

Types of steel materials Chemical component(%)
JIS standard KS standard Hardness to be used C Si Mn P S Cr Mo W V Co Ni Steel bar temperature
Die steel & Tool steel Die steel S55C mod. HP1A 28~33 0.50 ~0.55 0.15 ~0.35 0.70 ~0.90 - - MAX 0.50
SCM440 mod.
(HRC)
HP4A 39~45 0.36 ~0.40 0.15 ~0.35 0.85 ~0.95 0.90 ~1.10 0.25 ~0.35 MAX 0.50
SNCM mod.
(HRC)
HP4MA 41~47 0.33 ~0.37 0.15 ~0.35 0.80 ~1.00 1.65 ~1.75 0.40 ~0.50 0.40 ~0.50
NAK55 37~43 0.15 0.30 적량 0.30 3.00
NAK80 HP70 40~45 Comparing to NAK55, 'S' not included improving agent such as specular grindability etc.
Alloy steel SKD-11 STD11 56~62 1.40 ~1.60 0.40> 0.60> <0.03 <0.03 11.0 ~13.0 0.80 ~1.20 - 0.20 ~0.50 1050 Annealing
SKD-61 STD61 45~55 0.32 ~0.42 0.32 ~0.42 0.50 <0.03 <0.03 4.50 ~5.50 1.00 ~1.50 - 0.80 ~1.20 - 1000~1100 Annealing
SKD-5 STD-5 0.25 ~0.35 0.40> 0.60 <0.03 <0.03 2.0 ~3.0 - 9.0 ~10.0 0.30 ~0.50 - 1000~1100 Annealing
SKT-4 STF-4 0.50 ~0.60 0.35> 0.60 ~1.00 <0.03 <0.03 0.70 ~1.0 0.20 ~0.50 - - 1.30 ~2.0 1050 Annealing
SKS-2 STS-2 1.00 ~1.10 0.35> 0.80 <0.03 <0.03 0.50 ~1.00 - 1.00 ~1.50 - - - 1050 Annealing
SKS-3 STS-3 60+ 0.90 ~1.00 0.35> 0.90~1.20 <0.03 <0.03 0.50 ~1.00 - 0.50 ~1.00 - - - 1000 Annealing
High carbon steel SK-3 STC-3 63+ 1.00 ~1.10 0.35> 0.50> <0.03 <0.03 1000~1050 Annealing
SK-4 STC-4 1.90 ~1.00 0.35> 0.50> <0.03 <0.03 1050~1100 Annealing
SK-5 STC-5 0.80 ~0.90 0.35> 0.50> <0.03 <0.03 1050~1100 Annealing
High speed tool steel SKH-9 SKH-9 0.80 ~0.90 0.40> 0.40> <0.03 <0.03 3.80 ~4.50 4.50 ~5.50 5.50 ~6.70 1.60 ~2.20 900~1150 Annealing
SKD55 SKD-55 0.80 ~0.90 0.40> 0.40> <0.03 <0.03 3.80 ~4.50 4.80 ~6.20 5.50 ~6.70 1.70 ~2.30 4.50 ~5.50 900~1150 Annealing
Mechanical structural steel Carbon steel
S45C SM-45C 0.42 ~0.48 0.15 ~0.35 0.60 ~0.90 <0.03 <0.03 - 1050~1150 Annealing
S55C SM-55C 9~25 0.52 ~0.58 0.15 ~0.35 0.60 ~0.90 <0.03 <0.03 - 1050~1150 Annealing
Alloy steel SCM-435 SCM-3 0.33 ~0.38 0.15 ~0.35 0.60 ~0.85 <0.03 <0.03 0.90 ~1.20 0.15 ~0.30 <0.25 1050~1150 Annealing
SCM-440 SCM-4 0.38 ~0.43 0.15 ~0.35 0.60 ~0.85 <0.03 <0.03 0.90 ~1.20 0.15 ~0.30 <0.25 1050~1150 Annealing
SCM-415 SCM-21 0.13 ~0.18 0.15 ~0.35 0.60 ~0.85 <0.03 <0.03 0.90 ~1.20 0.15 ~0.30 <0.25 1050~1150 Annealing
SNCM-439 SNMC-8 0.36 ~0.43 0.15 ~0.35 0.60 ~0.9 <0.03 <0.03 0.60 ~1.00 0.15 ~0.30 1.60 ~2.00
SNCM-220 SNCM-21 0.17 ~0.23 0.15 ~0.35 0.60 ~0.90 <0.03 <0.03 0.10 ~0.65 0.15 ~0.30 0.40 ~0.70 1050~1100 Annealing
SNCM-420 SNCM-23 0.17 ~0.23 0.15 ~0.35 0.40 ~0.70 <0.03 <0.03 0.40 ~0.65 0.15 ~0.30 1.60 ~2.00 1050~1150 Annealing
SNCM-630 SNCM-5 0.25 ~0.35 0.15 ~0.35 0.35 ~0.60 <0.03 <0.03 2.50 ~3.50 0.50 ~0.70 2.50 ~3.50 1050~850 Annealing
SNCM-616 SNCM-26 0.13 ~0.20 0.15 ~0.35 0.80 ~1.20 <0.03 <0.03 1.40 ~1.80 0.40 ~0.60 2.80 ~3.20 1100~850 Annealing
SNCM-631 SNC-2 0.27 ~0.35 0.15 ~0.35 0.35 ~0.65 <0.03 <0.03 0.60 ~1.00 2.50 ~3.00 1050~1150 Annealing
SACM-645 SACM-1 0.40 ~0.50 0.15 ~0.35 <0.06 <0.03 <0.03 1.30 ~1.70 0.15 ~0.30 0.70 1.20
SUP-9 SPS-5 0.50 ~0.60 0.15 ~0.35 0.65 ~0.95 <0.03 <0.03 0.65 ~0.95
SUJ-2 STB-2 0.95 ~1.10 0.15 ~0.35 0.20 ~0.50 <0.03 <0.03 1.30 ~1.60 850~1100 Annealing
Heat treatment temperature (̊C) and hardness Purpose Etc
Yield Point Elongation Reduction of Area Impact Abso.En. HS Tensile strength SPECIAL ALLOYS
30~45 >15 >35 >15 28~33 70~85 added Templates for general miscellaneous goods,
Base materials for section member precision component
Deformation is reduced as the inside residual
stress is removed by the suitable heat treatment.
65~80 >15 >40 >60 37~43(40) 75~90 added Bumpers and radiator grills of the vehicles,
BOX AS machines, cabinets, home appliances, templates
Excellent durability with uniform
inside and outside hardness
75~90 >15 >40 >90 41~47(44) 90~105 added Bumpers and radiator grills of the vehicles,
BOX AS machines, cabinets, home appliances, templates
Excellent corrosion processing due to
low level of tissue/chemistry bias in tissue
High performance / precise plastic mold,
rubber mold, press mold, industrial machines etc.
Excellent machinability and weldability of machined
surface, Excellent corrosion machinability, Easy to grind
Products such as transparent goods that specular characteristic
is important, Products that electric discharge machining surface is important
Superexcellent specular grindability, Elaborate
and beautiful electric discharge machined surface
Loose Dip Tempering Annealing H.B Annealing H.R.C Tensile strength Steel type classification
830~880 Annealing 1000~1050 Air-cooling 150~200 Air-cooling 225> 61< Cooling alloy tool steel Cosmetic furnace, sripping knife, katta. Round, Flat, Angle
820~870 Annealing 1000~1050 Air-cooling 550~650 Air-cooling 230> 53> Fever pitch Alloy tool steel Srip, Dice of Danzopres Round, Flat
820~850 Annealing 1050~1100 Air-cooling 600~650 Air-cooling 235> 50> Dice for hot-pressure extraction, Digesting type Round Pole
740~800 Annealing 820~880 Air-cooling Air-cooled to zero intensity 241> - Dybrok
750~800 Annealing 830~880 Quenching 150~200 Air-cooling 217> 61< Tap, drill, katta, hacksaw blade, die. Drill Rod
750~800 Normalizing 800~850 Quenching 150~200 Air-cooling 217> 60< Alloyed tool steel Gauge die, tap Round, Flat, Angle
750~780 Annealing 760~820 Quenching 150~200 Air-cooling 212> 63< Carbon tool steel Dabu, woodworking tools, gauges, spring. Round, AngleBoard, Flat
740~760 Annealing 760~820 Quenching 150~200 Air-cooling 207> 61< Woodworking drill, gauge, pen touch, scrap bar 4Drill Rod
730~760 Annealing 760~820 Quenching 150~200 Air-cooling 207> 59< Saw, process type, punch Steel plate
800~880 Quenching 1200~1250 Quenching 540~570 Air-cooling 255> 62< Cutting tools, drill, milling katta.
800~880 Annealing 1220~1260 Quenching 530~570 Air-cooling 277> 63< high speed cutting tool
Normal Loose Dip Tempering HB Tensile strength
810~860 Air-cooling 810 Ro Nin 810~860 Quenching 550~650 Sudden chill 167~229 <58 Boltnat, Crankshocky, Finn. Made of a Round plate.
800~850 Air-cooling 790 Ro Nin 800~850 Quenching 550~650 Sudden chill 183~255 <66 Structural carbon steel Boltnat, Crankshocky, Finn.
- 810~850 Annealing 830~880 Quenching 530~630 Sudden chill 269~331 <95 Axillary flow, seizure, steel pipe, dental car
- 810~850 Annealing 830~880 Quenching Sudden chill 285~352 <100 Axial flow, seizure, steel pipe, bolt Made of a Round plate.
900~930 Air-cooling - 850~900 150~200 Air-cooling 235-321 <25 Axial flow, seizure, steel pipe, bolt
- 820~870 Quenching 580-680 Sudden chill 293-352 <100 Axial flow, dimensions, bolts
880~920 Air-cooling 850-900 Quenching 150-200 Air-cooling 248-341 <65 Axial flow, dimensions, bolts
850-900 Quenching 150-200 Air-cooling 293-375 <100 Axial flow, chicha, powerful bolt
850-870 Quenching 550-650 Sudden chill 302-352 <110 Large gear, propeller shaft
1st 850-900 Second 770-830 Air-Conditioning 100-200 Air-cooling 341-415 <120 Piston current
820-880 Annealing 820-880 550-650 Air-cooling 248-302 <85 Axial flow, gear, crank, postte
HRC<70 For surface nitrification
830-860 Quenching 460-510 363-429 <125 Superimposed spring, coil spring
780-810 Annealing 800-850 Quenching 140-180 HRC<60 Ball-bailing, roller-baring, pin