Tipo di tubo in acciaio |
Dimensioni tubo in acciaio mm | Deviazione ammessa | |||
Grado normale | senior | ||||
Tubo laminato a caldo | D | ≤ 159 | ± 1.0% ( valore minimo per ± 0,5 mm ) | ± 0.75% ( valore minimo per ± 0,3 mm ) | |
> 159 | ± 1.0% | ± 0.90% | |||
S | < 3.5 | + 15% ( Il valore minimo per + 0,48mm - 10% - 0,32mm ) | ± 10% ( valore minimo per ± 0,2 mm ) | ||
3.5~20 | +15%-10% | ±10% | |||
> 20 | D < 219 | ± 10% | ±7.5% | ||
D ≥ 219 | +12.5%-10.0% | ±10% | |||
Tubo trafilato a freddo | D | ≤ 30 | ± 0,20 mm | ± 0,15 mm | |
> 30~50 | ± 0,30 mm | ± 0,25 mm | |||
> 50 | ±0.8% | ±0.6% | |||
S | 2~3 | +12%-10% | ±10% | ||
> 3 | ±10% | ±7.5% |
Grado |
Composizione chimica, % | ||||||||||
C | Si | Mn | CR | MO | V | W | N.B. | Ni | P | S | |
10 |
0.07
~0.14 |
0.17
~0.37 |
0.35
~0.65 |
- | - | - | - | - | - | ≤0.030 | ≤0.030 |
20 |
0.17
~0.24 |
0.17
~0.37 |
0.35
~0.65 |
- | - | - | - | - | - | ≤0.030 | ≤0.030 |
16 Mn |
0.12
~0.20 |
0.20
~0.60 |
1.20
~1.60 |
- | - | - | - | - | - | ≤0.030 | ≤0.030 |
15 MnV |
0.12
~0.18 |
0.20
~0.60 |
1.20
~1.60 |
- | - |
0.04
~0.12 |
- | - | - | ≤0.030 | ≤0.030 |
10MoWVNb |
0.07
~0.13 |
0.50
~0.80 |
0.50
~0.80 |
- |
0.60
~0.90 |
0.30
~0.50 |
0.50
~0.90 |
0.06
~0.12 |
- | ≤0.030 | ≤0.030 |
12 CrMo |
0.08
~0.15 |
0.17
~0.37 |
0.40
~0.70 |
0.40
~0.70 |
0.40
~0.55 |
≤0.030 | ≤0.030 | ||||
15 CrMo |
0.12
~0.18 |
0.17
~0.37 |
0.40
~0.70 |
0.80
~1.10 |
0.40
~0.55 |
- | - | - | - | ≤0.030 | ≤0.030 |
1Cr5Mo | ≤ 0.15 | ≤ 0.50 | ≤ 0.60 |
4.00
~6.00 |
0.40
~0.60 |
- | - | - | ≤ 0.60 | ≤0.030 | ≤0.030 |
12Cr2Mo |
0.08
~0.15 |
≤ 0.50 |
0.40
~0.70 |
2.0
~2.50 |
0.90
~1.20 |
- | - | - | - | ≤0.030 | ≤0.030 |
12SiMoVNb |
0.08
~0.14 |
0.50
~0.80 |
0.60
~0.90 |
- |
0.90
~1.10 |
0.30
~0.50 |
- |
0.04
~0.08 |
- | ≤0.030 | ≤0.030 |
Grado |
Resistenza alla trazione, MPa |
Limite di snervamento, MPa |
Allungamento min, % |
10 | 335~490 | 205 | 24 |
20 | 410~550 | 245 | 24 |
16 Mn | 490~670 | 320 | 21 |
15 MnV | 510~690 | 350 | 19 |
12 CrMo | 410~560 | 205 | 21 |
15 CrMo | 440~640 | 235 | 21 |