Steel wire rods price from Sha Steel Plant
Date: July 11, 2022

Steel wire rods price from Sha Steel Plant
Date: July 1, 2022

Steel wire rods price from Sha Steel Plant
Date: June 21, 2022

Steel wire rods price from Sha Steel Plant
Date: June 11, 2022

Steel wire rods price from Sha Steel Plant
Date: June 1, 2022

Steel wire rods price from Sha Steel Plant
Date: May 21, 2022

Steel wire rods price from Sha Steel Plant
Date: May 11, 2022

Lead adhesion on steel wire surface is a serious problem in annealing and patenting, because the following pickling treatment can hardly remove the lead residue and phosphating film can either hardly be closely compact on steel wire, which could lead to die block and steel wire breakage in subsequent drawing as well as lead excessive consumption.

In order to avoid above accident and ensure steel wires always in perfect state for followed production, we summarized a fewer of key points as below.
1) Confirm the steel wires should be in good surface without any scratch before annealing and patenting.
2) We should adjust the furnace temperature between 900 and 1000 degrees in centigrade against various steel wire sizes and finally to settle the wire temperature should be 900-910 centigrade.
3) Set the temperature of lead liquid in tank be at 550 centigrade and turn up to 560 centigrade only if lead adhesion still available and which should be effective.
4) Lead tank should be covered tightly without any parts open in the air, just in order to avoid steel wire oxidized and excessive viscosity of lead under oxidization.
5) Enlarge the exit end angle of lead tank, for instance from 30 up to 45 degrees, in order to help the lead residue on steel wire surface fall off easily.
6) We should insist on clearing up the furnace and checking the wire conveyor roller in good state without any crack once a month, in order to prevent steel wires from unexpected scratch.

1) To calculate the weight of wire rope (KG/100m)
Formula: M=K X D X D
M=Reference weight of wire rope (KG/100m)
K = certain coefficient of weight (different coefficient for different rope construction)
D = diameter of wire rope
For instance
Wire rope: 6X7-FC -10mm (Nature fiber core), as we know its K=0.351, and the reference weight = 0.351X10X10 = 35.1 (KG/100m)

2) To calculate the wire rope minimum breaking load(KN)
Formula: F = (K X D X D X R) / 1000
F = wire rope minimum breaking load by actual test (KN)
K = certain coefficient of weight (different coefficient for different rope construction)
D = diameter of wire rope
R = tensile strength of wire rope (MPA)
For instance
Wire rope: 7X7-10mm, as we know K=0.359, R=1770, and the minimum breaking load F = (0.359X10X10X1770)/1000=63.5 KN

There are certain differences in some respects for steel wire processed between lead patenting and water quenching.
1. Pollutant
(a) Lead patenting
The main pollutant from lead patenting is lead steam and lead oxide. Annealing one ton of steel wire needs to consume 3-5kg of lead and among which 0.05-0.20kg of lead is steamed into atmosphere while the remains changed into lead oxide. The residue of lead oxide and lead steam are both inevitably coming even though covering agent is applied. It is necessarily required to clear away the covering agent on every two months and that may cause recycling pollution.
(b) Water quenching
The main pollutant is just the quenching bath with ferric oxide involved. However, the quenching additive is of food grade and needs eliminated on every half year which can be easily treated without any pollution.

2. Technical
(a) Lead patenting
In the lead bath, the constant temperature is controlled at 500-550 degree centigade and the sorbite conversion rate for steel wire can reach 90-98%, which ensure the wires in good quality and stability.
(b) Water quenching
In the steaming film, the temperature is controlled at 500-600 degree centigrade and the sorbite conversion rate for steel wire can reach 90-95% but with more serious technical demand.

3. Operation
(a) Lead patenting
Lead temperature is the only parameter need control.
(b) Water quenching
The temperature, concentration, impurity and more other parameters in quenching bath need strictly control.

4. Others
Steel wires through lead patenting can achieve higher tensile strength of 60-100mpa and finally enjoy more flexibility and toughness than those through water quenching. In addition, lead patenting is a little bit costly than water quenching on investment.