Galvanized wire and all other wire mesh are manufactured by wire
rod. chengtong buy this material from SHANXI ZHONGYANG IRON and
STEEL CO., LTD, which is the biggest steel factory in China.The
type of wire rod is Q195, element composition is as follows:C≤0.07;
S≤0.023; Si≤0.09; Mn≤0.32; P≤0.025.Because This type of wire rod
has less Impurities, Q195 is fit for drawing. The diameter is
6.5mm. Generally, Daily output of chengtong is 120 tons。
1.Galvanized wire's first stage is drawing.
there are two kinds of drawing machine: powder drawing and water
drawing. powder drawing is fit for junior drawing(6.5mm~4.0mm). One
powder drawing machine has 4 tanks and 4 molds. One tank is matched
with a mold. Each of them are offered energy by a electromotor.
0.9mm(max)can be "eat" when the wire cross a mold. There are no
loss of weight during drawing.
Powder is used as lubricant, which is made of soap and butter. Mold
is hidden behind the powder.
Water draw is used for senior draw.(≤4.0mm)The container is filled
with water, soap and 8 molds. Compared with powder draw, water draw
can save lots of room and the wire cannot be broken.
After drawing, the wire is thinner, but also very hard. The tensile
strength is about 700N. These wire can be used to produce nail and
mesh panel. For galvanized wire, it still need annealing
2.Galvanized wire's second stage is anneal.
Anneal is to low the tensile strength of wire. The stove is solid
and built with red bricks. The architecture of anneal stove is
cuboid. Different thickness of wire require different temperature.
Range is from 700°C to 900°C. Output of the anneal stove, the
tensile strength is 400N~600N
3.Galvanized wire's third stage is chlorhydric acid washing.
After the draw and anneal, the wire is thinner, softer but also
much more dirty. It needs chlorhydric acid washing to remove the
impurities. Chlorhydric acid washing requires water pool and
chlorhydric acid pool. The density of chlorhydric acid is 17%. In
the Chlorhydric acid pool, there is a caldron used for the emission
4.Galvanized wire's fourth stage: Zinc coating
After the chlorhydric acid pool, water pool is also necessary. In
the zinc pool, displacement reaction is chemical and uniformly
distributed. The surface of wire is smooth. Because wire cross the
zinc pool fast, abundant zinc coating requires 4 zinc pools