Also disclosed is a discharge surface treatment method that can render the hardness of a surface higher than the inherent surface hardness of a base material.
The present invention improves the surface hardness of a polymerized-monomer-coating hard film without reducing the interior hardness thereof.
Then, the screw (10) is tempered such that the surface hardness does not exceed the core hardness by more than 3 Rockwell C points, and both the surface and core are at a Rockwell C33-C39 hardness.
A resin exemplified in the present invention can provide the resin molded product having a surface with improved mechanical properties and surface hardness.
In order to solve the problem, a sticky primer layer (12) is provided between a substrate (11) and a UV ink coating film (16) that has a surface hardness higher than the pencil hardness H.
In the devi ce the hardnes s o f the blade ( 18 ) is less than the hardness of the outer surf ace ( 44 ) .
A preferred air bearing surface (26) should have an RMS surface roughness of at least 10 Angstroms and a resistivity of less than 106 ohms-cm.
As a result, the surface roughness of a free surface of the cured resin layer (2) can be reduced to, for example, 0.1 νm or less.
After tempering, a surface hardening of 860 to 880 HV and a core hardening of 550 to 650 HV are achieved.
Disclosed is a transparent thermoplastic resin composition with excellent transparency, toughness, and surface hardness.
A thread forming screw (10) having a minimum surface hardness of HRC 56.
Provided is a resin laminate which has high surface hardness, while having high transparency.
The steel member is a steel member for machine parts with a surface hardness of at least 58 HRC.
The screw (10) can form threads in a workpiece having a surface hardness which exceeds HRC 23.