◆

Establishing traceability to the National Standards is effective for

improving efficiency and technology.

◆

The hardness standard block has outstanding uniformity.

◆

The accuracy of the hardness value is indicated for each of the

hardness standard block.

Standardized  Blocks  For  Hardness

Standardized  Blocks  For  Hardness

Number of Hardness

Force（�s）

Size

Number of Hardness

Force（�s）

Size

HRC  20,25,30,35,40,45,50,55,60,62,64,67,70

φ65

HV  100,200,300,400

10

φ65

HRB  30,40,50,60,70,80,90,95,100

φ65

HV  500,600,700,800,900,1000

30

φ65

HRA  55,60,65,70,75,80,85

φ65

HMV  100

0.05

φ32

HR15N  70,75,80,85,90

φ65

HMV  200

0.1

φ32

HR30N  40,45,50,55,60,65,70,75,80,85

φ65

HMV  300,400,500,600,700

0.2

φ32

HR45N  20,30,40,50,60,70

φ65

HMV  800,900,1000

0.3

φ32

HR15T  70,75,80,85,90

φ65

HK  100.200,300,400,500,600,700,800

φ32

HR30T  30,35,40,45,50,55,60,65,70,75,80

φ65

HV  Standardized Indentation

φ65

HR45T  20,30,40,50,60,70

φ65

HMV  Standardized Indentation

φ32

HRE  70,80,90,92,100,112

φ65

CERTIFICATE (Japanese)

HRF,HRL,HRM,HRR,HRS,HR15Y, 他

φ65

CERTIFICATE (English)

*Please ask for details

HS  30,40,50,60,70,80,90,95,100

φ65

Standardized  Blocks  For  Charpy  Impact  Test

HB  100

10/500

φ115

30J          (１set＝Five pieces）

JIS4号

HB  200,229,250,300,350,400,450,500,550,600

10/3000

φ115

100Ｊ         （１set＝Five pieces）

1) Because blocks having nominal hardness other than those shown above will also be manufactured, please consult us for further details.

2) Because measurements for blocks of HV, HMV, and HB will be made at the test load you want, please give us details.

Q & A

Q1:

Why do you use the term  "Hardness Standard Block"

clearly stated in the definition of hardness are realized

instead of commonly used term  "Hardness Reference

in a tester and a indentor (or hammer).

Block" ?

Thus,  in accordance with the original concept at the

A1:

The traceability of hardness in Japan to the National

time when the test method was first developed,  test

Standards of National Research Laboratory of Metrology

conditions such as indenting speed and load retention

(NRLM)  has been established.  However,  in the past,

time are determined within a range where the balance

various conventional values were used in the market.

between load and intending amount is not disrupted

They were not unified and inconsistent.  In such cases

and rapid measurements can be performed.  In addition,

they were referred to as hardness reference blocks.

comparisons are also made with International Standards.

To distinguish the national standards from the

conventional values,  in particular,  the block which is

Q3:

What is the Standard Indentation?

traceable to NRLM national standards referred  to as

A3:

In the case of Vickers or Micro-vickers hardness test,

the Hardness Standard Block.

the error caused by the operator in the indentation

measuring is generally greater than error of the tester

Q2:

How are the Hardness Standard Values determined?

itself.  The differences among individuals carrying out

A2:

The hardness standard should have a definite value

the measurements and differences in repeated mea-

that will serve as a standard for calibration of tester.

surements in days cannot be avoided.  To conduct an

Thus,  it is necessary for it to be universal in principle.

accurate Vickers hardness test,  it is necessary to

NRLM adopted a method in which the hardness standard

calibrate the indentation measurements by the wellcha-

value is determined by an ideal tester and the correction

racterized indentation.  The indentation for the calibration

of deformation an indentor (or hammer) under specified

is valued in the diagonal dimension of it by using the

measuring conditions (deformation mechanism).

Standard Indentation Measuring System developed by

To achieve this,  after the effects of error factors of the

NRLM.  It is referred as the Standard Indentation to dis-

various elements composing the tester and the indentor

tinguish it from the indentation valued by other system.

(or hammer) are evaluated sufficiently,  the conditions

◆We comply with requests to manufacture various test specimens.

( including New Materials )

Applications for Special Sales Agents are Invited.