GOST 19671-91. Tungsten wire for light sources. Technical conditions.

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Application area

This standard applies to tungsten drawn wire of group A (black) of grades BA, BM, BPH, VT-7, VT-10, VT-15, manufactured by powder metallurgy and intended for the production of light sources.
Tungsten wire for light sources (hereinafter referred to as wire) shall be manufactured in accordance with the requirements of this standard for process regulations approved in accordance with the established procedure.
The wire assortment is determined by the requirements of GOST 18903;
The chemical composition of the wire must comply with the standards given in the table


Wire brand	Mass fraction of tungsten,%, not less than	Mass fraction of thorium oxide,%	Mass fraction of impurities,%, not more than				Mass fraction of additives (including potassium),%
			in total	including			aluminum	silicon
				gland	calcium	molybdenum
VA	99.95	-	-	0.005	0.005	0.03	0.001−0.004	0.001−0.006
VRN	99.90	-	-	0.01	0.02	0.04	0.001−0.01	0.001−0.01
VM	99.70	0.17−0.25	0.05	-	-	-	-	-
VT-7	98.96	0.70−0.99	0.05	-	-	-	-	-
VT-10	98.46	1.00−1.49	0.05	-	-	-	-	-
VT-15	97.95	1.50−2.00	0.05	-	-	-	-	-

The wire should be free from burrs, delaminations, cracks, kinks and local thickenings. On wire with a diameter of more than 500 μm, risks and burrs are allowed that do not lead the wire beyond the maximum diameter deviations. The color of the wire should be from black to gray. On the surface of a wire with a diameter of more than 500 μm, the colors of ripeness from violet to dark blue are allowed.
Supplier — AvekGlob Company — offers at a reasonable price from the manufacturer a wide range of wire of various diameters, which is obtained from tungsten, is intended for making filaments, and meets the requirements of GOST 19671−91. The supplier guarantees the timely delivery of products to any address specified by the consumer.

Mechanical characteristics


Diameter of wire, micron					Conditional tensile strength rc / mg / 200 mm	Temporary tensile strength, N / mm
From	17.5	before	25.5	Including	70−110	2671−4165
St.	25.5	«	50.0	«	60−105	2156−4108
«	50.0	«	77.0	«	55−100	2058−3773
«	77.0	«	128.0	«	50−95	1871−3577
«	128.0	«	250.0	«	50−90	1871−3430

A VA wire intended for spiraling onto a core of a diameter equal to or less than two wire diameters (core factor of 2 or less) should not break off and stratify when spiraling.

The wire of grades VA, BM, VT-7, VT-10, VT-15, intended for spiraling onto core with a diameter of more than two wire diameters (core factor more than 2), should not break off and separate with spiral.
A VA wire should not have a coarse-grained structure after annealing at the temperature given in the table


Diameter of wire, micron					Annealing temperature, ° С
Nominal	Limit Deviations
From	20	before	79	Including	1850	-50
St.	79	«	178	«	1800	-50
«	178	«	285	«	1750	-50
«	285	«	495	«	1650	-50
«	495	«	1100	«	1600	-50
«	1100	«	1500	«	1550	-50

A VA wire with a diameter of more than 700 μm, intended for the production of the filament body, shall be made of tungsten, which has passed a creep test at a diameter of 1250 μm. The residual elongation should not exceed 3 mm.
Supplier — AvekGlob Company — offers to purchase various profiles of wire, which is made of tungsten and tungsten alloys, is intended for making filaments, and meets the requirements of GOST 19671−91. Products can be bought at a price formed on the basis of European and world standards of production. Implementation is possible in bulk and retail, for regular customers, a flexible system of discounts operates.

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GOST 19671-91. Tungsten wire for light sources. Technical conditions.

Application area

Mechanical characteristics