The ST45.8 high-pressure alloy tube for boilers is a specialized pipe material in the chemical engineering field, primarily used in high-pressure boiler heating surface components and petrochemical equipment with operating pressures ≥9.8 MPa and temperatures between 450°C and 650°C, covering key components such as economizers and superheaters.
ST45.8 Carbon Steel Pipe Chemical Composition
| Grade | Chemical Components (%) | ||||||
| C | Si | Mn | P | S | Mo | Cr | |
| St 45.8 | ≤0.17 | 0.10-0.35 | 0.40-0.80 | ≤0.040 | ≤0.040 | / | / |
Mechanical Properties of P265GH ST45.8 Seamless Hydraulic Tubes
| Grade | Mechanical properties | ||
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) | |
| St 45.8 | 410-530 | ≥255 | ≥21 |
DIN17175 ST45.8 Specification
|
18*3 |
42*6 |
89*8 |
159*9.5 |
|
18*4 |
42*8 |
89*9 |
159*10 |
|
18*5 |
45*3 |
89*10 |
159*12 |
|
19*2 |
45*4 |
89*11 |
159*14 |
|
21*4 |
45*5 |
89*12 |
159*16 |
|
22*2.5 |
45*6 |
108*4.5 |
159*18 |
|
22*3 |
45*7 |
108*5 |
159*20 |
|
22*4 |
48*4 |
108*6 |
159*28 |
|
22*5 |
48*4.5 |
108*7 |
168*6 |
|
25*2.5 |
48*5 |
108*8 |
168*7 |
|
25*3 |
48*6 |
108*9 |
168*8 |
|
25*4 |
48*7 |
108*10 |
168*9.5 |
|
25*5 |
48.3*12.5 |
108*12 |
168*10 |
|
25*5.5 |
51*3 |
108*14 |
168*11 |
|
27*3.5 |
51*3.5 |
108*15 |
168*12 |
|
27*4 |
51*4 |
108*16 |
168*14 |
|
27*5 |
51*5 |
108*20 |
168*15 |
|
27*5.5 |
51*6 |
114*5 |
168*16 |
|
28*2.5 |
57*4 |
114*6 |
168*18 |
|
28*3 |
57*5 |
114*7 |
168*20 |
|
28*3.5 |
57*5.5 |
114*8 |
168*22 |
|
28*4 |
57*6 |
114*8.5 |
168*25 |
|
30*2.5 |
60*4 |
114*9 |
168*28 |
Test and inspction of ST45.8 heat-resistant steels Pipe
Tensile test
Leakage test
Notch impact/bending test
Grade identification test
Ring test
Visual inspection of tube surface
Gauging
Hot tensile test
Non-destructive test
DIN17175 ST45.8 Seamless Carbon Steel Boiler Tube and Heat Exchanger Tubes Factory
