1.7262 15CrMo 1.7709 12Cr1MoV alloy steel sheet is martensitic precipitation hardening / aging hardening of stainless steel, with high strength and hardness, but also has a very good corrosion resistance. The material has a good processing performance, while a lower temperature to do a heat treatment can be aging hardening.
chemical component%
| Ni |
Cu |
Al |
Co |
Mn |
Si |
Co |
| 63 |
27~33 |
2.5~3.15 |
0.25 |
1.5 |
0.5 |
0.25 |
Heat treatment
Annealing can be used to soften the metal matrix after processing, or it can be used to dissolve the aging hardened phase. Although the softening effect is achieved at a low temperature range of 760 ° C to 871 ° C, it is recommended that the annealing temperature of the hot-worked product be 982 ° C and the annealing temperature of the cold drawn product for the purpose of subsequent aging hardening. Using 1038 ° C. When the temperature exceeds 982 ° C, the grain growth rate is quite fast, and if it is necessary to have a fine grain structure, it is necessary to control the heat treatment time at a high temperature to a minimum.
In order to obtain the best aging reaction and the maximum softening result, after the heat treatment, it is necessary to carry out the effective water quenching treatment immediately. Failure to immediately carry out the water quenching or quenching speed is very slow will produce part of the aging hardening phase precipitation, damage aging reaction. Water quenching in the liquid by 2% (by volume) of alcohol can reduce the oxidation and easy pickling treatment.
In order to achieve the highest performance, it is recommended to use the following aging hardening process
1. Soft material (140-180 Brinell, 75-90RB)
594 ° C-607 ° C for 6 hours and then cool down to 482 ° C at -9.5 ° C to -3.9 ° C / hr. From 482 ° C to room temperature can be used furnace cooling or air cooling, no need to control the cooling rate. This process is suitable for forging, quenching and annealing forging, annealing, hot bars, large diameter cold drawn bar (diameter greater than 1.5 ") and softened tempered wire and strip.
2. Moderate cold work (175-250Brinell, 8-25RB)
593 ° C-607 ° C for 8 hours or more, then cooled to 482 ° and the cooling rate does not exceed -9.5 ° C to -3.9 ° C / hr. If the material only through a small amount of cold work, holding time up to 16 hours, can get a higher hardness. In general, the initial hardness of 175-200Brinell material holding time requires 16 hours. Close to 250Brinell (25Rc) material insulation 8 hours can be fully achieved hardness. The process is suitable for cold strip, rod, semi-hard state of the strip and cold heading material.
3. Completely cold working material (260-325Brinell, 25-35Rc)
527 ° C-538 ° C for 6 hours and then cooled to 482 ° C with a cooling rate of no more than -9.5 ° C to -3.9 ° C / hr. If the initial hardness of the material is close to the lower limit of hardness, through the heat 8-10 hours, you can get a higher hardness. The process is suitable for elastic tempered strip, spring wire and heavy cold workpieces, such as cold-formed beads.
Note: The cooling can be carried out in stages at 100 ° F for 4 to 6 hours each time. For example, the heat treatment of process 1 is 1100 ° F Insulation 16 hours + 1000 ° F Insulation 4-6 hours + 900 ° F Insulation 4 -6 hours, but heat treatment according to the process described in 1.2.3 above usually results in higher performance materials.
In some cases it is necessary to shorten the heat treatment time, in order to reduce the cost or in order to obtain some intermediate performance.It is difficult to determine the specific heat treatment time.It is recommended to cross the cross-section of the material specifications of the test piece to explore the heat treatment time.
Excessive labor aging will reduce the performance of the material, and the subsequent aging treatment can no longer improve the material properties.In order to strengthen the over-artificial aging material, must be solution treatment (1800-1900 ° F), re-dissolved aging hardening ingredients, and then re- The benefits of cold work are offset by the annealing process, and the highest strength and annealing and aging conditions that the material can achieve.
The hardening of the material can achieve the highest hardness, but the reheating does not improve the material properties. If the first heat treatment is cooled very quickly, reheating between 1050-800 ° F may slightly improve the material properties. Of the material is heat treated at temperatures above 1100 ° F and then cooled, and the material properties will be reduced. The hardened K500 needs to be heated continuously at 800 ° F for a long time. The first month will slowly deteriorate and continue to heat There will not be any big changes.
Machine performance
K500 of the annealing state, hot working state and quenching state is more suitable for heavy machine plus. Aging of the material can be refined to close to the precision and then fine again. The recommended process step is to first process to a large size, then aging hardening, and then repair to the specified size. Aging produces a permanent shrinkage of material (approximately 0.0002 in / in).
K500 application industry:
Chemical processing industry
Maritime engineering
Oil and gas exploration
Parts made with K500:
Centrifugal pump
Oil and gas extraction equipment spare parts
transmission shaft
Pump shaft
spring
Valves and valve components
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