EN10305 Standard Cold Drawn Seamless Steel Pipe For Hydraulic
Equipment
Outer Diameter:16MM-219MM
Thickness:2.5MM-40MM
Standard: EN10305
Cold drawn steel pipes are precision cold-drawn seamless pipes with
high dimensional accuracy and good surface finish for mechanical
structures and hydraulic equipment. The use of precision seamless
pipes to manufacture mechanical structures or hydraulic equipment
can greatly save machining hours, improve material utilization, and
help improve product quality.
Dimension Tolerance
| I.D tolerance (mm) | O.D tolerance (mm) | I.D Roughness (µm) | Straightness (mm/meter) |
| H7-H9 | -/+0.5% | 0.10-0.80 | 0.2-0.80 |
Size Deviation
| Deviation level | Standardized Outer Diameter Tolerance |
| D1 | ±1.5%. Minimum±0.75 mm |
| D2 | ±1.0%. Minimum±0.50 mm |
| D3 | ±0.75%. Minimum±0.30 mm |
| D4 | ±0.50%. Minimum±0.10 mm |
Product Features
1. The outer diameter is smaller.
2. High precision and small batch production
3. The cold drawn (rolled) finished product has high precision and
good surface quality.
4. The cross-sectional area of the steel pipe is more complicated.
5. The performance of the steel pipe is more superior, and the
metal is relatively dense.
Delivery Conditions
1. BK (+C) No heat treatment after last cold forming process.
2. BKW (+LC) After last heat treatment there is a light finishing
pass .
3. BKS (+SR) After the final cold forming process the tubes are
stress relieve annealed.
4. GBK (+A) After the final cold forming process the tubes are
annealed in a controlled atmosphere.
5. NBK (+N) After the final cold forming process the tubes are annealed above
the upper transformation point in a controlled atmosphere.
Production Process
Different processing methods and corresponding auxiliary procedures
are selected according to the processing performance of the metal,
the size of the pipe, the quality requirements, and the investment
and benefits. The basic processes of cold-rolled and cold-drawn
pipes are:
(1) pipe material supply, the pipe materials used are hot-rolled
finished pipes or semi-finished pipes, extruded pipes and welded
pipes;
(2) pipe material preparation, including inspection, bundling, acid
Washing, cleaning, rinsing, neutralizing, drying, lubricating,
etc.;
(3) Cold working (cold rolling or cold drawing);
(4) Finishing of finished products includes heat treatment of
finished products, straightening, sampling, cutting heads and
tails, inspection ( Manual inspection and various flaw detection),
hydraulic test, oiling, packaging, storage, etc. Different products
have different finishing contents.
Application
1. Automotive and mechanical pipes
2. Petroleum cracking pipes
3. High Pressure Boiler Pipe
4. Low and middle pressure fluid transportation pipeline
5. Chemical fertilizer equipment pipe
Our Company
16MM-219MM
