ISO 10303-214:2010(E)
A Hardness is the hardness of a material on its surface. The hardness represents the resistance of a surface to deformation by external forces.
EXAMPLE Figure 43 gives examples for the specification of surface hardness on technical drawings. On the left side a surface hardness with the measuring method 'Vickers HV30' according to ISO 4516 [13], the hardness value '620', the hardness value tolerance '+160', the treatment type 'Rht' (surface layer hardening), the hardness limit '500', the hardening depth '0,8 mm', and the hardening depth tolerance '+0,8 mm' is specified. On the right side a surface hardness with the measuring method 'Rockwell HRC' according to ISO 6508 [15], the hardness value '57', the hardness value tolerance '+6', the treatment type 'Eht' (case hardening), the hardening depth '1,2 mm', and the hardening depth tolerance '+0,7 mm' is specified.
A Hardness is a type of Surface_condition.
The data associated with a Hardness are the following:
The depth specifies the depth measured from the surface into the material where the specified hardness applies.
EXAMPLE The depth of the hardened material after a high-frequency quenching process is an example for depth.
See hardness to value_with_unit for the application assertion.
The depth need not be specified for a particular Hardness.
The description specifies additional information about the Hardness.
EXAMPLE 'depth is describing the total effective case depth' is an example for description.
See hardness to multi_language_string for the application assertion.
The description need not be specified for a particular Hardness.
If present, there shall be exactly one object that defines the description for a Hardness.
The environment_condition specifies the conditions under that the specified hardness_value is valid.
There may be more than zero environment_condition for a Hardness.
The hardness_value specifies the value of the hardness.
See hardness to value_with_unit for the application assertion.
The measuring_method specifies the method for measuring hardness values.
Where applicable the following values shall be used:
The measuring_position specifies the position where the hardness is measured with respect to the part of interest.
EXAMPLE 'core' or 'surface' are examples for measuring_position where 'core' is inside the hardened part, i.e., it is measured before a quenching process, and 'surface' is on the surface of a hardened part, i.e., it is measured after a quenching process.
The measuring_position need not be specified for a particular Hardness.
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