Cold Drawn Carbon Spring Steel Wire

Carbon Steel Wire tensile testing machine, carbon Steel Wire torsion tester, carbon steel wire winding tester, carbon steel wire torsion tester, carbon steel wire test method

Reverse:

Wires with a diameter not exceeding 6.00 mm shall be subjected to torsion inspection, and the number of torsion shall be in accordance with Table 1.

Wire diameter mm	Number of twists (not less than)
	B, C level	Class D
≤2.00	20	18
>2.00-3.00	15	13
>3.00-4.00	12	8
>4.00-5.00	10	5
>5.00-6.00	8	3

Table 1

When twisting, the wire shall not have visible cracks and delamination on the surface within the specified number of twists.

Winding:

The wire is tested for winding according to Table 2. The surface of the sample after winding shall not be cracked or broken.

Wire level	Wire diameter d mm	Mandrel diameter mm	Number of windings
B, C level	≤6.00	d	≥2
Class D	≤4.00
	>4.00	2d

Table 2

bending:

Wires with a diameter greater than 6.00 mm shall be subjected to bending inspection. The surface of the specimen after bending shall not be cracked or broken.

experiment method:

The inspection method, sampling quantity and test requirements of the steel wire inspection project shall comply with the requirements of Table 3.

Pilot projects	Number of samples per batch	Testing method	Test requirements
Tensile test	Disk-by-disk, double-ended	GBT228
Torsion test	Disk-by-disk, double-ended	GBT239	The spacing between the chucks is 100 times the diameter of the steel wire. When the gap between the chucks is greater than or less than 100 times the diameter of the steel wire, the number of twists increases or decreases in proportion to the gap between the chucks. In this case, the number of twists should be converted into 100 times the diameter of the steel wire.
Bending test	One-by-one, one end	Both ends of the sample are oriented in different directions Along the circle of R = 10 mm One arc bent 90°
Winding test	10%, no less than 3, one end	GBT2976

table 3