EN P690QH EN 10028-6
Boiler and Pressure Vessel Steel Product Introduction
The EN P690QH EN 10028-6 steel grade is a special type of high-strength steel grade used in structural and pressure vessel applications in Europe. It is one of the most commonly used structural steel grades due to its excellent combination of strength, weldability and toughness. This article will examine the specific characteristics of this steel grade, its advantages, and some of its key applications.
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Application: Pressure flat steel products - Part 6: Weldable fine grain steel, quenched and tempered.
Heat treated: 1211°C - 1125°C.
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EN P690QH EN 10028-6 Chemical element
EN P690QH EN 10028-6 in addition to carbon, steel also contains a small amount of manganese (Mn), silicon (Si), sulfur (S), phosphorus (P), oxygen (O), nitrogen (N) and hydrogen (H). These elements are not intentionally added to improve the quality of steel, but are brought in by ore and smelting process, so they are called impurity elements. These impurities have a certain impact on the properties of steel. In order to ensure the quality of steel, the chemical composition of all kinds of steel is strictly stipulated in technical standards.
The main elements proportion is as below:
| Element | Min | Max | Similar |
|---|---|---|---|
| N | - | 0.0150 | - |
| Cu | - | 0.3000 | - |
| B | - | 0.0050 | - |
| Ti | - | 0.0500 | - |
| Nb | - | 0.0600 | - |
| V | - | 0.1200 | - |
| Mo | - | 0.7000 | - |
| Ni | - | 2.5000 | - |
| Cr | - | 1.5000 | - |
| P | - | 0.0250 | - |
| S | - | 0.0150 | - |
| Mn | - | 1.7000 | - |
| Si | - | 0.8000 | - |
| C | - | 0.2000 | - |
| Zr | - | 0.1500 | - |
| Nb | - | 0.0600 | - |
| Cu | - | 0.3000 | - |
EN P690QH EN 10028-6 Mechanical properties
More detailed information about EN P690QH EN 10028-6 steel Mechanical Properties, please refer to the following table:
| Yield Rp0.2 (MPa) |
Tensile Rm (MPa) |
Impact KV/Ku (J) |
Elongation A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 997 (≥) | 377 (≥) | 41 | 42 | 12 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 133 |
EN P690QH EN 10028-6 Physical properties
Physical properties of EN P690QH EN 10028-6 are mainly indicated by modulus of elasticity, thermal conductivity, specific thermal capacity, electrical resistance value, coefficient of thermal expansion, density, poisson's ratio, etc.
| Temperature (°C) |
Modulus of elasticity (GPa) |
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) |
Specific thermal capacity (J/kg·°C) |
Specific electrical resistivity (Ω mm²/m) |
Density (kg/dm³) |
Poisson's coefficient, ν |
|---|---|---|---|---|---|---|---|
| 41 | - | - | 0.14 | - | |||
| 585 | 753 | - | 14.3 | 122 | - | ||
| 727 | - | 21 | 43.2 | 422 | 234 |
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