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TU 1231-406-00187180-2018

ALLOY TAPE 40KHNM
FOR ELASTIC ELEMENTS

TU 1231−406−00187180−2018

Technical conditions


The term of introduction is 05/01/18.




Oct 2018


These specifications apply to a strip made of alloy 40KHNM, intended for the manufacture of elastic elements.

The tape is subdivided according to the manufacturing accuracy:
— normal accuracy in thickness and width;
— increased accuracy in thickness and width — «VS»;
— increased thickness accuracy — «B».

An example of a conventional designation: Tape 0.35 mm thick, 8 mm wide, increased accuracy in thickness and width from alloy 40KHNM:

Tape 40KHNM 0.35x8-VSh TU 1231−406−00187180−2018.

1. VARIETY

1.1. The dimensions of the tape and the maximum deviations for them must correspond to those indicated in table 1.

Table 1

Thickness Limit deviations depending on manufacturing accuracy Width Limit deviations depending on manufacturing accuracy
Normal Increased Normal Increased
1 2 3 4 five 6
0.13 -0.02 -0.015 ten -0.3 -0.2
0.15 -0.03 -0.02

13… 16

6.75

0.19
0.22
0.23 6.75; 9
0.24 eleven
0.25 eleven
0.26 -0.04 -0.03 7.65
0.32 8… 12
0.35 eight
0.36 7.65
0.42 15… 20
0.50 10.4
0.63 15… 25


2.1. TECHNICAL REQUIREMENTS

2.1. The tape is made of alloy grade 40KHNM in accordance with GOST 10994.

2.2. The mechanical properties of the tape (spring angle and the number of bends), determined on heat treated samples, must correspond to those indicated in Table 2.

table 2

Normal tape thickness, mm Spring angle, in degrees, not less Number of folds, not less
1 2 3
0.13 134 40
0.15 128 40
0.19 145 nineteen
0.22 136 12
0.23 133 20
0.24 130 20
0.25 170 32
0.26 168 thirty
0.32 156 thirty
0.35 150 thirty
0.36 147 17
0.42 135 fifteen
0.50 143 20
0.63 125 ten

Note: When checking the mechanical properties of the consumer, the heat treatment of the samples is carried out according to the mode specified in the supplier’s certificate.

2.3. The surface of the tape should be flat, clean and light.

2.4. There should be no sunsets, deep shells and scratches on the surface of the tape. Separate scratches, risks, shells, ripples, nicks, imprints from rolls, the depth or height of which does not exceed half of the maximum deviations in thickness, are allowed. Lamination in the tape is not allowed.

Roughness parameter Ra is no more than 0.63 microns in accordance with GOST 2789.

2.5. The tape is supplied with cut edges. There should be no burrs on the edges of the tape, the value of which exceeds half of the maximum deviations in thickness, as well as other defects with a depth of no more than half of the maximum deviations in width. Traces of abrasion are allowed.

The roughness of the edge surface is not standardized.

3. Test methods.

3.1. Determination of the spring angle is carried out according to the GOST 15146 method and according to table. 3.

Table 3

Nominal tape thickness, mm Mandrel diameter, mm
0.1… 0.15 5.0
0.16… 0.24 ten
0.25… 0.45 20
0.46… 0.65 thirty


3.2. Determination of the number of bends is made according to GOST 13813 and according to table. 4.

Table 4

Nominal tape thickness, mm The radius of the jaws of the device, mm Lever arm length of the device, mm
0.1… 0.24 2 6
0.25… 0.45 4 12
0.46… 0.70 6 18


4. Acceptance rules, other test methods, labeling, packaging, transportation and storage in accordance with GOST 14117.