We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
The yield of seamless tube production is calculated as:
Yield (%) = Qualified Tube Weight ÷ Total Billet Input Weight × 100%
It measures how efficiently raw materials are converted into finished seamless steel tubes. Higher yield = lower loss + better cost control.
Seamless tube yield refers to the ratio of finished, qualified pipe weight to total raw material input during production.
It reflects:
Production efficiency
Process control level
Cost performance
Engineering Insight:
Yield is one of the most critical KPIs in seamless pipe manufacturing.
Yield Calculation Formula
Yield is calculated using the following standard formula:
Yield Rate = Qualified Product Weight ÷ Total Raw Material Weight × 100%
Parameter Definition:
Total Raw Material Weight: Total billet or tube blank input (actual or theoretical weight)
Qualified Product Weight: Finished seamless pipes that pass inspection and are ready for delivery
Example Calculation
Raw material input: 100 tons
Qualified output: 91 tons
Yield = 91 ÷ 100 × 100% = 91%
|
Production Type |
Typical Yield |
|
Hot-rolled seamless pipe |
85% – 92% |
|
Cold-drawn / cold-rolled precision pipe |
75% – 85% |
|
Advanced continuous rolling mill |
92% – 95% |
Key Insight: More processing steps = higher loss = lower yield.
|
Stage |
Cause of Loss |
Typical Loss Rate |
|
Piercing & Cutting |
End trimming after piercing |
3% – 5% |
|
Heating Oxidation |
Scale formation during heating |
1% – 2% |
|
Pickling |
Surface corrosion during scale removal |
0.5% – 1% |
|
End Cutting |
Removal of defective ends |
2% – 4% |
|
Scrap |
Defects (cracks, folds, uneven wall) |
2% – 5% |
|
Sampling & Testing |
Destructive testing loss |
0.1% – 0.3% |
Total losses accumulate across the entire process chain.
Use high-quality billets (no cracks, low segregation)
Perform surface inspection and defect removal
Optimize billet cutting length
Use walking beam furnaces for uniform heating
Control temperature and holding time precisely
Reduce oxidation (scale loss)
Use high-precision piercing and rolling mills
Optimize tooling (dies, rolls)
Apply online OD and wall thickness monitoring
Use ultrasonic testing to locate defects
Optimize cutting length dynamically
Reuse short-length pipes where possible
Implement full-process traceability
Repair recoverable defects instead of scrapping
Analyze scrap causes regularly
Maintain rolling mills, furnaces, and sizing equipment
Calibrate roll gaps regularly
Reduce downtime-related losses
Train operators on process control
Link yield to performance metrics
Encourage cost-reduction initiatives
Q1: What is a good yield for seamless pipe production?
Typically 85%–92% for hot rolling and up to 95% for advanced lines.
Q2: What is the biggest source of loss?
Piercing, cutting, and scrap due to defects.
Q3: Why is cold-drawn pipe yield lower?
Because it involves multiple processing steps and higher dimensional requirements.
Q4: How to quickly improve yield?
Focus on billet quality, heating control, and reducing scrap.
Seamless tube production yield is a key indicator of efficiency, quality, and cost control. By understanding the calculation method, identifying loss points, and optimizing production processes, manufacturers can significantly improve yield, reduce waste, and enhance overall competitiveness.
English
Español
Français
بالعربية
