About Us
Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Size: 4mm to 130mm outer diameter
Material:E355 (ST52.4),E235 (ST37.4)
Standard:DIN 2391/C (DIN EN 10305-1),DIN 2445/2 (DIN EN 10305-4)
Finishing:NBK (Phosphate and Normalized)
|
Chemical Composition (%)
|
Carbon (C)
|
Silicon (Si)
|
Manganese (Mn)
|
Phosphorus (P)
|
Sulfur (S)
|
|
E355 (ST52.4)
|
⩽ 0.22
|
⩽ 0.55
|
⩽ 1.6
|
⩽ 0.045
|
⩽ 0.045
|
|
E235 (ST37.4)
|
⩽ 0.17
|
⩽ 0.35
|
⩽ 1.2
|
⩽ 0.045
|
⩽ 0.045
|
Hydraulic tube is made according to DIN 2391/C (DIN EN 10305-1) or DIN 2445/2 (DIN EN 10305-4) standards and it is available in millimeters, inches outer diameter, and inches nominal bore size.
How to make hydraulic tube
The tubes surface finishing is NBK, where the tubes are phosphate and normalized which provides corrosion resistance. It is oiled inside and outside. Normalize process creates tougher metal product. During normalizing, metals will be heated at a high temperature, and it allowed to naturally cool back down to room temperature by exposure after heating. Metals that have been through this process are more formable, harder and ductile.
Pressure ratings of hydraulic tube
Allowable working pressures are calculated using as per DIN 2413 at normal temperature. The yield and tensile stress values utilize to determine the maximum allowable running pressure and wall thickness required. The tubes and pipes are delivered the actual yield and tensile stress values are verified from the true copy material certificates. Pressure reduction factors at various temperatures show below:
|
° C
|
-40
|
120
|
150
|
175
|
200
|
250
|
|
° F
|
-40
|
248
|
302
|
347
|
392
|
482
|
|
Rating Factor
|
0.90
|
1.0
|
0.89
|
0.89
|
0.83
|
NA
|
