Good Durability Alloy Steel Seamless Pipes Round Steel Tubing Excellent Strength
Application:seamless steel tubes for oil and gas and geological drill rods application
30ХГСА 30HGSA 30CrMnSiA
Chemical composition, %
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.28 - 0.34 | 0.9 - 1.2 | 0.8 – 1.1 | Up to 0.3 | Up to 0.025 | Up to 0.025 | 0.8 - 1.1 | Up to 0.3 |
Temperature of 30HGSA material critical points.
| Ac1 = 760 , Ac3(Acm) = 830 , Ar3(Arcm) = 705 , Ar1 = 670 , Mn = 352 |
Mechanical properties, Т=20oС, 30HGSA material.
| Assortment | Size | Direction | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPа | MPа | % | % | rJ / m2 | - |
| Stick | Æ 25 | 1080 | 830 | 10 | 45 | 490 | tempering 880oC, oil, drawback 540oC, water | |
| Forged pieces | 500-750 | 14 |
| Hardness 30HGSA after annealing , | HB 10 -1 = 229 МPа |
Physical properties 30HGSA material.
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
| Degree | MPа | 1/Degree | Watt /(m*degree) | Kg /m3 | J / (kg · degree) | Ohm · м |
| 20 | 2.15 | 38 | 7850 | 210 | ||
| 100 | 2.11 | 11.7 | 38 | 7830 | 496 | |
| 200 | 2.03 | 12.3 | 37 | 7800 | 504 | |
| 300 | 1.96 | 12.9 | 37 | 7760 | 512 | |
| 400 | 1.84 | 13.4 | 36 | 7730 | 533 | |
| 500 | 1.73 | 13.7 | 34 | 7700 | 554 | |
| 600 | 1.64 | 14 | 33 | 7670 | 584 | |
| 700 | 1.43 | 14.3 | 31 | 622 | ||
| 800 | 1.25 | 12.9 | 30 | 693 | ||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Technological properties of 40X material.
| Weld ability: | limited weld ability |
| Flocsensitivity: | sensitive |
| Tendency to the temper brittleness: | There is such a tendency |
Designations:
| Mechanical properties: | |
| sв | - Short-term breaking point , [МPа] |
| sT | - Proportional limit (yield strength for residual deformation), [МPа] |
| d5 | - Elongation at the time of abruption , [ % ] |
| y | - Contraction , [ % ] |
| KCU | - Impact strength , [ кJ / m2] |
| HB | - Brinnel hardness , [МPа] |
|
Physical properties:
|
|
| T | - Temperature when given values where received , [Degree] |
| E | - Coefficient of elasticity of the first type , [МPа] |
| a | - Coefficient of temperature (linear) expansion (interval 20o - T ) , [1/Degree] |
| l | - Heat conductivity (heat capacity) , [Watt / (m · degree)] |
| r | - Material density , [kg / m3] |
| C | - Specific heat capacity (interval 20o - T ), [J / (kg · degree)] |
| R | - Resistivity, [ohm · m] |
Weld Ability:
Without limits - welding is carried without heating and further heat treatment
Limited weld ability – Welding is possible at the heating up to 100-120°C and further heat treatment
Difficult weld ability - Additional operations are necessary to get good weld joints: heating up to 200-300°C during welding, heat treatment after welding - annealing
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