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Carbon Steel

Carbon Steel Overview

Classification Type Chemical composition
C SI Mn P S Cu Ni Cr Ni+Cr
Carbon tool
steel 		SK2M 1.10~1.3 0.35MAX 0.5MAX 0.03MAX 0.03MAX 0.25MAX 0.25MAX 0.3MAX
SK3M 1.00~1.1 0.35MAX 0.5MAX 0.03MAX 0.03MAX 0.25MAX 0.25MAX 0.3MAX
SK4M 0.9~1.0 0.35MAX 0.5MAX 0.03MAX 0.03MAX 0.25MAX 0.25MAX 0.3MAX
SK5M 0.8~0.9 0.35MAX 0.5MAX 0.03MAX 0.03MAX 0.25MAX 0.25MAX 0.3MAX
SK6M 0.70~0.8 0.35MAX 0.5MAX 0.03MAX 0.03MAX 0.25MAX 0.25MAX 0.3MAX
SK7M 0.60~0.7 0.35MAX 0.5MAX 0.03MAX 0.03MAX 0.25MAX 0.25MAX 0.3MAX
Carbon steel S30CM 0.27~0.35 0.15~0.35 0.60~0.9 0.03MAX 0.035MAX 0.3MAX 0.2MAX 0.2MAX 0.35MAX
S35CM 0.32~0.38 0.15~0.35 0.60~0.9 0.03MAX 0.035MAX 0.3MAX 0.2MAX 0.2MAX 0.35MAX
S45CM 0.42~0.48 0.15~0.35 0.60~0.9 0.03MAX 0.035MAX 0.3MAX 0.2MAX 0.2MAX 0.35MAX
S50CM 0.47~0.53 0.15~0.35 0.60~0.9 0.03MAX 0.035MAX 0.3MAX 0.2MAX 0.2MAX 0.35MAX
S55CM 0.52~0.58 0.15~0.35 0.60~0.9 0.03MAX 0.035MAX 0.3MAX 0.2MAX 0.2MAX 0.35MAX
S60CM 0.55~0.65 0.15~0.35 0.60~0.9 0.03MAX 0.035MAX 0.3MAX 0.2MAX 0.2MAX -
S65CM 0.60~0.70 0.15~0.35 0.60~0.9 0.03MAX 0.035MAX 0.3MAX 0.2MAX 0.2MAX -
S70CM 0.65~0.75 0.15~0.35 0.60~0.9 0.03MAX 0.035MAX 0.3MAX 0.2MAX 0.2MAX -

APPLICATION

S45CM Clutch part, Machine part Clutch parts, chain parts
S50CM Spring Spring
S55CM Machine part Machine part
S60CM Chain part, woodwork supplies, Blind Chain part, woodwork supplies, Blind
S65CM Spring, Clutch part Spring, Clutch part
S70CM Washer, Saw , Spring Washer, Saw , Spring
SK2M Saw, Spring, Camera shutter Saw, Spring, Camera shutter
SK3M Saw, Spring, knife Saw, Spring, knife
SK4M Spring, Gage, Saw, Needle Fan stand, Spring, Gage, Saw, Needle
SK5M Spring, Saw, Needle Spring, Saw, Needle
SK6M Spring, Saw, Clutch part, Washer 2. Carbon steel Spring, Saw, Clutch part, Washer 2. Carbon steel

MECHANICAL PROPERTY

Symbol of temper A S R QT
Classification Annealed Skin passed Roiled Quenching & Tempered
Type Hardness (Hv) Tensile Strength (kgf/mm2) Tensile Strength (kgf/mm2) Hardness (Hv) Hardness (Hv) Hardness (Hv) Tensile Strength (kgf/mm2)
SK2M 180-220 60-70 15Max 220Max 220-280 350-850 112-∞
SK3M 180-220 60-70 15Max 220Max 220-280 350-850 112-∞
SK4M 180-200 50-70 20Max 210Max 210-270 350-700 112-∞
SK5M 170-200 50-70 20Max 210Max 210-270 350-700 112-∞
SK6M 170-190 50-65 25Max 200Max 200-260 350-700 112-∞
SK7M 150-190 50-60 25Max 200Max 220-260 350-700 112-∞

SURFACE FINISH

Surface Finish Remarks
Standard Color(Dark-Blue) Heat Treatment
White Color Grinding After Heat Treatment
Blue or Yellow Color Coloring AfterGrinding