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Special Steels

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Pre-harden

1.Dimension and tolerance of round bars

[mm size table] 

Category Diameter Tolerance Surface defect
Unground(UG) Ø1.0 to 13.3 +0.08
-0.020
0.15 or less
Ground Ø1.0 to 13.0 +0
-0.022
Decarb free
Precision Drawn Ø0.2 to 3.6 +0
-0.020
Standard length: 2000
(Maximum length of 4000mm and small-sized cutting materials are also available.)

2.Dimension and tolerance of flat bars

Category Thickness Thickness
Tolerance
Nominal width Width [mm]
Tolerance
Surface defect
Unground 1.0 to 2.5 +0.05
-0
4.0 to 12.0 +0.05
-0
0.05 or less
Standard length: 2000
(Maximum length of 4000mm and small-sized cutting materials are also acceptable.)

3.Various shapes

Various shaped materials other than round and flat steel can be manufactured.

4.Straightness

Length Straightness
20 or greater and 50 or less 0.020 or less
Greater than 20 and 75 or less 0.045 or less
Greater than 75 and 100 or less 0.080 or less
Greater than 100 and 175 or less 0.150 or less
Greater than 175 and L or less (L/200)2 x 0.02 or less

5.Hardness: Selection following each steel type and application

(Example) SKH9 for cutting tool : 65-67HRC
for parts mold : 58-65HRC