Products - Inner threaded steel tube for high pressure boiler
GB/T 20409-2006
Size: OD28.6-76.2mm
WT5.1-18.33mm
Length12000mm Max.
Description:
1. Tubes are made by a seamless process and are cold finished.
| Chemical composition |
| |
20G |
20MnG |
25MnG |
12CrMoG |
15CrMoG |
| Carbon |
0.17-0.23 |
0.17-0.23 |
0.22-0.29 |
0.08-0.15 |
0.12-0.18 |
| Manganese |
0.35-0.65 |
0.70-1.00 |
0.70-1.00 |
0.40-0.70 |
0.40-0.70 |
| Silicon |
0.17-0.37 |
0.17-0.37 |
0.17-0.37 |
0.17-0.37 |
0.17-0.37 |
| Chrome |
|
|
|
0.40-0.70 |
0.80-1.10 |
| Molybdenum |
|
|
|
0.40-0.55 |
0.40-0.55 |
| Sulfur |
≤0.020 |
≤0.020 |
≤0.020 |
≤0.020 |
≤0.020 |
| Phosphorus |
≤0.025 |
≤0.025 |
≤0.025 |
≤0.025 |
≤0.025 |
| Mechanical properties |
| |
20G |
20MnG |
25MnG |
12CrMoG |
15CrMoG |
| Tensile strength (MPa) |
410-550 |
≥415 |
≥485 |
410-560 |
440-640 |
| Yield strength (MPa) |
≥245 |
≥240 |
≥275 |
≥205 |
≥235 |
| Elongation (A/%) |
≥24 |
≥22 |
≥20 |
≥21 |
≥21 |
| Impact (J) |
≥35 |
≥35 |
≥35 |
≥35 |
≥35 |
| Recommended steel grade |
| Chemical composition |
| |
SA-210 A1 |
SA-210 C |
SA-213 T2 |
SA-213 T12 |
| Carbon |
≤0.27 |
≤0.35 |
0.10-0.20 |
0.05-0.15 |
| Manganese |
≤0.93 |
0.29-1.06 |
0.30-0.61 |
0.30-0.61 |
| Silicon |
≥0.10 |
≥0.10 |
0.10-0.30 |
≤0.50 |
| Chrome |
|
|
0.50-0.81 |
0.80-1.25 |
| Molybdenum |
|
|
0.44-0.65 |
0.44-0.65 |
| Sulfur |
≤0.035 |
≤0.035 |
≤0.025 |
≤0.025 |
| Phosphorus |
≤0.035 |
≤0.035 |
≤0.025 |
≤0.025 |
| Mechanical properties |
| |
SA-210 A1 |
SA-210 C |
SA-213 T2 |
SA-213 T12 |
| Tensile strength (MPa) |
≥415 |
≥485 |
≥415 |
≥415 |
| Yield strength (MPa) |
≥255 |
≥275 |
≥205 |
≥220 |
| Elongation (A50mm/%) |
≥30 |
≥30 |
≥30 |
≥30 |
| HRB |
≤79 |
≤89 |
≤85 |
≤85 |
| HBW |
≤143 |
≤179 |
≤163 |
≤163 |
|
A type size
