General mechanical equipment is lossy, and the production of seamless steel pipes also has a certain loss. The standard and loss rate of seamless steel pipe loss are still relatively large. The specific loss situation can be calculated, and what is the calculation method? Let's find out together with the seamless steel pipe manufacturers.
What is loss rate?
The loss rate refers to a certain rate of loss determined by the production enterprise after checking the consumption of the unit product and the total material consumption according to the normal defect and loss in the process of producing products. The attrition rate is most commonly used in the cost calculation of factories and merchants. The higher the attrition rate, the more unfavorable it is for factories and merchants.
The formula for calculating loss rate:
There are two calculation formulas for the wastage rate, which are used for the calculation of material quotas and the procurement of materials by enterprises.
1. Loss rate=(loss/net consumption)×100%
Expressed in terms of consumption: consumption = net consumption × (1 + loss rate)
The formula used to determine material consumption quotas. The net consumption refers to the materials directly used in construction and installation projects, and the loss refers to unavoidable construction waste and material loss. It is mainly used for various project budgets and final accounts, which is common throughout the country and has industry standards and legal significance.
2. Loss rate=(loss/consumption)×100%
Expressed as consumption: consumption = net consumption ÷ (1-loss rate)
Not a formula for determining material consumption quotas. Generally, it is the formula used by the construction unit to calculate the purchase quantity of materials. The value is determined by itself according to the construction technology level of the unit, construction conditions, source and method of material procurement, and the processing characteristics of the material itself. It is a self-use formula.
Manufacturing loss rate of seamless pipe:
1) For example: What is the cutting loss, rolling waste and burning loss of an annual output of 150,000 tons of seamless steel pipes?
The proportion of seamless steel pipe cutting loss, rolling waste and burning loss mainly depends on the size, quality, specification, coating, etc. of the raw material, so you need to analyze specific issues. But in general, the rolling loss rate can reach about 11%, the burning loss rate can reach about 4%, and the cutting loss is generally controlled below 5%. In addition, heat treatment processing will bring a certain amount of burning loss, and the specific ratio will vary. In addition, when producing all kinds of seamless steel pipes, product quality testing must also be considered, and large losses may also occur during quality testing. It is generally required that steel pipes that are not subject to such testing should account for about 10% of the total products.
2) What is the loss rate when the seamless pipe is perforated?
When the seamless steel pipe is perforated, the general loss rate is about 2%. It depends on the wall thickness, the loss of the thick wall is smaller, and the loss of the thin wall is larger.
3) In the production of seamless steel pipes, what is the loss of general heat treatment?
There are many heat treatment methods for heat treatment, and the loss will vary. If it is the most common annealing heat treatment, the loss is about 1%. If it is oxygen-free annealing, there is basically no loss, because the surface of the tube is not oxidized, does not grow oxide scales, and does not peel off, so there is no loss. Other heat treatments, such as quenching and tempering, also depend on the specific process and method.
Usually, the straight pipe loss is generally about 3%, the bend pipe is about 6%, and the gradient pipe is generally about 10%. For example: when the iron rod is processed into a round shaft, the loss is small because of the simple process; but when it is processed into a square shaft, the loss rate may be large due to the complicated process.
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