DIN 17175 ST45.8 Seamless steel Tubes
Standard:DIN 17175 Seamless Steel Tubes For Elevated Temperatures
As far as DIN 17175 is concerned, steels that have a good mechanical properties at a higher temperature, up to 6 00 °C, and even under long-term load, are called heat-strength steels.
DIN 17175 St45.8 Seamless Steel Tubes can be used to manufacture steam boilers, pipes, pressure vessels and instruments operating at temperatures up to 600 ° C and at high temperatures.
DIN 17175 St45.8 Seamless Steel Tubes Quick Details
Manufacture:Seamless process
Out Dimensions: 14mm-711mm
Wall Thickness: 2mm-60mm
Length: Fixed(6m,9m,12,24m) or normal length(5-12m)
Ends: Plain End, Beveled End, Treaded
Manufacturing method
DIN 17175 St45.8 Seamless Steel Tubes may be produced by hot rolling, cold rolling, hot pressing, hot drawing or cold drawing.
The tube steel can be smelted in a flat furnace or an electric furnace according to the oxygen blowing method, and all steels should be cast in a static manner.
Supply status
The 17175 St45.8 Seamless Steel Tubes Will be delivered through a suitable heat treatment. heat treatment includes:
– Normalizing
– Annealing
– Tempering; from the quenching temperature, it is not cold, but then tempered
– Adjust the mass by the isothermal transformation method.
Heat treatment temperature of DIN 17175 St45.8 Seamless Steel Tubes
|
Steel Grade
|
Thermal processing ℃ |
Normalizing℃ |
Tempering |
|
Grade
|
Material number
|
Quenching temperature ℃
|
Tempering temperature ℃
|
| St45.8 |
1.0405 |
1100 to 850°C |
870-900 |
– |
–
|
Chemical composition of DIN 17175 St45.8 Seamless Steel Tubes
|
Standard:DIN 17175
|
grade |
Chemical composition |
|
C
|
Si |
Mn |
P、S |
Cr |
Mo
|
| St45.8 |
≤0.21 |
0.10-0.35 |
0.40-1.20 |
≤0.030 |
/ |
/
|
Mechanical property of DIN 17175 St45.8 Seamless Steel Tubes
|
Standard
|
grade |
Tensile Strength(MPa) |
Yield Strength(MPa) |
Elongation(%) |
| DIN 17175 |
St45.8 |
410-530 |
≥255 |
≥21
|
Dimensions Tolerance of DIN 17175 St45.8 Seamless Steel Tubes
|
Project
|
Standard |
Size range |
Tolerance |
|
Outer diameter
|
DIN17175
|
Hot rolled steel pipe
|
OD ≤ 100mm |
± 0.75%( Min ± 0.5mm ) |
| OD＞ 100~ 320mm |
± 0.9%
|
| Cold drawn steel pipe OD ≤ 120mm |
± 0.6%( Min ± 0.25mm ) |
|
Wall thickness
|
DIN17175
|
OD ≤ 130mm
|
WT ≤ 2Sn
|
+15%~-10% |
|
WT ＞ 2Sn~4Sn
|
+12.5%~-10%
|
| WT ＞ 4Sn |
± 9%
|
| 130 ＜ OD ≤ 320mm |
WT ≤ 0.05OD |
+17.5%~-12.5%
|
|
0.05OD ＜ WT ≤ 0.11OD
|
± 12.5% |
| WT ＞ 0.11OD |
± 10%
|
Test of DIN 17175 St45.8 Seamless Steel Tubes
Chemical composition verification test
hydrostatictest
Tensile test
Notched impact test
Yield strength test
Ring test
Nondestructive testing
