| .D（mm） |
70 |
89 |
102 |
108 |
114 |
121 |
123 |
127 |
140(139.7) |
|
| W.T（mm） |
4.5－7.0 |
4.5－8.0 |
4.5－10.0 |
4.5－10.0 |
4.5－10.0 |
4.5－10.0 |
4.5－12.0 |
4.5－12.0 |
4.5－12.0 |
|
| O.D（mm） |
146 |
152(152.4) |
165 |
168 |
178 |
180 |
182 |
194 |
204 |
|
| W.T（mm） |
4.5－12.0 |
4.5－12.0 |
5.0－12.0 |
5.0－14.0 |
5.5－15.0 |
5.5－15.0 |
5.5－15.0 |
5.5－15.0 |
5.5－15.0 |
|
| O.D（mm） |
229 |
232 |
245 |
255 |
262 |
267 |
273 |
279 |
356 |
|
| W.T（mm） |
5.5－14.0 |
6.0-18.0 |
8.0－20.0 |
7.5－30.0 |
7.5－30.0 |
7.5－30.0 |
7.5－30.0 |
7.5－30.0 |
8.5-36 |
|
| O.D（mm） |
406 |
559 |
610 |
630 |
711 |
|
|
|
|
|
| W.T（mm） |
8.5-38.0 |
16-27.0 |
18-30.0 |
18-30.0 |
18-45 |
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
| Grade |
Chemical Analsis（％） |
| C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
Mo |
V |
| 30CrMo |
0.26-0.34 |
0.17-0.37 |
0.40-0.70 |
≤0.025 |
≤0.025 |
0.80～1.10 |
|
≤0.20 |
0.15～0.25 |
— |
| 34CrMo4 |
0.32～0.39 |
0.17-0.37 |
0.40-0.70 |
≤0.025 |
≤0.035 |
0.80～1.10 |
|
≤0.20 |
0.15～0.25 |
— |
| 37Mn/1 |
0.36～0.40 |
0.17-0.37 |
1.50-1.70 |
≤0.025 |
≤0.025 |
≤0.30 |
|
≤0.20 |
— |
— |
| 37Mn/2 |
0.34～0.38 |
0.17-0.37 |
1.45-1.70 |
≤0.025 |
≤0.025 |
≤0.30 |
|
≤0.20 |
— |
— |
| 37Mn/3 |
0.30-0.37 |
0.17-0.37 |
1.40-1.75 |
≤0.025 |
≤0.025 |
≤0.30 |
≤0.30 |
≤0.20 |
≤0.10 |
0.07-0.12 |
| |
|
|
|
|
|
|
|
|
|
|
| Heat Treatment |
|
| Grade |
Kind |
Normalizing ℃ |
Cooling |
Tempering ℃ |
Cooling |
T.S.（MPa） |
Y.S.（MPa） |
Elongation（％） |
Impact Test Akv（J） |
|
| 30CrMo |
Q |
890±10 |
Water Cooling |
650±10 |
Air Cooling |
780 |
660 |
16 |
55 |
|
| 34CrMo4 |
Q |
880±10 |
Water Cooling |
635±10 |
Air Cooling |
890 |
755 |
16 |
55 |
|
| 37Mn/1 |
N |
840±10 |
Water Cooling |
|
|
730 |
520 |
16 |
30 |
|
| 37Mn/2 |
N& Q |
840±10 |
Water Cooling |
600±10 |
Air Cooling |
730 |
610 |
16 |
55 |
|
| 37Mn/3 |
N |
870±10 |
Water Cooling |
|
|
730 |
520 |
16 |
30 |
|
Standard
GB 18248, JIS G3429, EN 10083, DIN17200+Technical Agreement
Grade
37Mn, 34Mn2V, 30CrMo, 35CrMo, 34CrMo4, STH11, STH12, STH21, STH22, etc.
Application
For high pressure container and gas cylinder
Mechanical Properties
Standard Steel Grade Tensile Strength(MPa) Yield Point(MPa) Elongation(%)
GB18248
37Mn ≥750 ≥630 ≥16
34Mn2V ≥745 ≥530 ≥16
30CrMo ≥930 ≥785 ≥12
35CrMo ≥980 ≥835 ≥12
ASTM A519 —Seamless Carbon and Alloy Steel Mechanical Tubing 37Mn, 34CrMo4
Cylinder tubes conforming to DIN 10305-1 seamless
Cylinder tubes DOM conforming to DIN 10305-2 welded
Cylinder tubes DOM conforming to ASTM A 513 welded
Cylinder tubes made of stainless steel Cylinder tubes conforming to DIN 2448
EN 10297
EN 10083
Hydraulic support pipes are seamless pipes, chiefly in making hydraulic supports for coal mines, hydraulic cylinders and pistons for truck cranes and other purposes, among which hydraulic supports account for the maximum proportion. Supports are the supporting and protective facilities to prevent the ceiling from falling and to ensure the safety of those who work in the mine. Their cylinder and piston must be made with seamless steel tubes. These hydraulic pipes are required to have adequate safety in operation, high reliability, strength and tenacity so that even the pipe body cracks, it will not break into pieces. Such requirements are necessary because these pipes are used in damp environment underground, have to sustain very high pressure and load and tolerate constant corrosion and rusting. Usually they are made of alloy structural steel of 30CrMo or 27 SiMn under tempered and quenched condition (more hydraulic cylinders use #45 steel). Pipe today must be machined and welded when making supports. Therefore pipes are also required to have good performances in cutting, grinding, welding and chromium plating. the pipes produced have small fluctuation in chemical composition, low content of hazardous elements, high quality purity, excellent inside and outside surface quality, high accuracy geometric dimensions and stables performance.
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