34CrMo4 Seamless High Pressure Gas Cylinder Pipe
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What kind of seamless steel pipe is the grade 34CrMo4?
34CrMo4 is a chromium-molybdenum steel alloy material, which is mainly used to produce seamless steel pipe materials for rolling high-pressure gas cylinders/cylinders and high-pressure vessels.
Chemical composition of 34CrMo4 material: C: 0.30~0.37 Si: ≤0.40 Mn: 0.60~0.90 P, S: ≤0.020 P+S: ≤0.030 Cr: 0.90~1.20 Mo: 0.15~0.30 Ni: ≤0.30 Cu: ≤0.20
General implementation standards for seamless steel pipes for 34CrMo4 gas cylinders: national standard GB/T 18248-2021, Japanese standard JIS G 3429, international standard ISO 11120, European standard EN 10297-1, American standard ASTM A372/A372M-3
Mechanical properties of 34CrMo4 gas cylinder tube: tensile strength after heat treatment ≥980Mpa, yield strength ≥835Mpa, elongation after break ≥12%, -50° low temperature impact energy ≥27J.
34CrMo4 steel pipes are generally delivered in a rolled or cold-drawn state. They are cut and processed into gas cylinders or steel cylinders and then heat treated and tempered.
| Chemical composition in % by mass | |||||||||||||||
| Steel grade | C | Si | Mn | P | S | Cr | Mo | Ni | |||||||
| 34CrMo4 | 1.722 | 0,30 | 0,37 | – | 0,40 | 0,60 | 0,90 | 0,035 | 0,035 | 0,90 | 1,20 | 0,15 | 0,30 | – | – |
| Mechanical properties for tubes made of steels in accordance with the delivery condition +QT | |||||||||||||||||
| Steel grade | Minimum tensile properties | ||||||||||||||||
| Steel name | Steel number | Yield strength (ReH) | Tensile strength ( Rm) | A% | |||||||||||||
| MPa | MPa | ||||||||||||||||
| For T in mm | For T in mm | For T in mm | |||||||||||||||
| ≤ 8 | > 8 | > 20 | > 50 | ≤ 8 | > 8 | > 20 | > 50 | ≤ 8 | > 8 | > 20 | > 50 | ||||||
| ≤ 20 | ≤ 50 | ≤ 80 | ≤ 20 | ≤ 50 | ≤ 80 | ≤ 20 | ≤ 50 | ≤ 80 | |||||||||
| l | t | l | t | l | t | l | t | ||||||||||
| 34CrMo4 | 1.722 | 800 | 650 | 550 | 500 | 1000 | 900 | 800 | 750 | 11 | 9 | 12 | 10 | 14 | 12 | 15 | 13 |
34CrMo4 Seamless Steel Tube
The main conventional sizes of seamless steel pipes for 34CrMo4 gas cylinders are: 108*4, 114*4, 139.7*4, 139.7*4.5, 139.7*5, 140*4, 140*4.5, 140*5, 203*5.3, 203* 5.4, 229*5.3, 229*5.8, 232*5.3, 232*5.4, 267*5.7, 279*6.5, 279*6.8, 279*6, 316*7, 325*7.1, 325*7, 340*16.8, 355.6*7.2, 355.6*7.4, 355.6*7.5, 356*7.2, 356*7.4, 356*7.5, other sizes can also be customized.
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