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Anonymous users2024-02-07The hardness after quenching and tempering 40CR is about between HRC32-36, that is to say, about HB301-340. 40cr steel quenched and tempered.
It has good comprehensive mechanical properties.
Good low-temperature impact toughness.
and low notch sensitivity. The hardenability of the steel is good, it can be hardened to 28 60mm when water quenched, and it can be hardened to 15 40mm when oil quenched. In addition to quenching and tempering, this steel is also suitable for cyanide and high-frequency quenching.
Dispose. The machinability is good, when the hardness is 174 229HB, the relative machinability is 60%. This steel is suitable for making medium-sized plastic molds.
40cr characteristics:
Medium carbon quenched and tempered steel, cold heading die steel. The steel is moderate, easy to process, and can obtain certain toughness, plasticity and wear resistance after proper heat treatment. Normalizing.
It can promote spheroidization of the structure and improve the cutting performance of blanks with hardness less than 160hbs. Tempered at a temperature of 550 570, the steel has the best comprehensive mechanical properties. The hardenability of this steel is higher than that of 45 steel.
It is suitable for high-frequency quenching, flame quenching and other surface hardening treatments.
The above content reference: Encyclopedia-40cr
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Anonymous users2024-02-06830-860 degrees heating, oil cooling, heating time 2-3h (the specific time depends on the thickness of the parts and the furnace, etc.), tempering temperature 600 degrees, 28hrc; 300 degrees, about 51HRC. The tempering time shall not be less than 30min, which shall be determined by the thickness.
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Anonymous users2024-02-05840 860 degrees heating, tempering temperature is determined by hardness, 500 degrees hardness in HRC30, 400 degrees hardness in HRC40, 300 degrees in HRC50
The quenching time is determined by the thickness and heating method. Ordinary radiant oven time = thickness (mm) + 10 30 minutes.
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Anonymous users2024-02-04850 keep warm for one hour quenching oil, 580 temper for two hours. (Ordinary shafts).
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Anonymous users2024-02-03What is the hardness of No. 45 steel itself? How much hardness can be achieved after quenching?
What is the hardness of No. 45 steel itself? How much hardness can be achieved after quenching? Dear, hello, after quenching the steel is not tempered, the hardness is greater than HRC55 (up to HRC62) is qualified.
The highest hardness for practical application is HRC55 (high-frequency quenched HRC58).Do not use the heat treatment process of carburizing and quenching for steel number. The hardness of No. 45 steel quenching and tempering parts after quenching should reach HRC56 59, and the possibility of large cross-section is lower, but not lower than HRC48, otherwise, it means that the workpiece has not been completely quenched, and there may be soxenite or even ferrite structure in the structure, which is still retained in the matrix through tempering, and cannot achieve the purpose of quenching and tempering.
The high temperature tempering after quenching of No. 45 steel, the heating temperature is usually 560 600, and the hardness requirement is HRC22 34Because the purpose of quenching and tempering is to obtain comprehensive mechanical properties, the hardness range is relatively wide. However, if the drawing has hardness requirements, the tempering temperature should be adjusted according to the requirements of the drawings to ensure the hardness.
For example, some shaft parts require high strength and high hardness; However, some gears and shaft parts with keyways have to be milled and inserted after quenching and tempering, and the hardness requirements are lower. Regarding the tempering insulation time, depending on the hardness requirements and the size of the workpiece, we believe that the hardness after tempering depends on the tempering temperature, which has little to do with the tempering time, but it must be reversed, and the general tempering and holding time of the workpiece is always more than one hour. I hope my answer is helpful to you, and finally I wish you good health and a happy mood again!
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Anonymous users2024-02-0235crmo alloy structural steel.
35CrMo alloy structural steel, with high static strength, impact toughness and high fatigue limit, higher hardenability than 40Cr, high 35CrMo creep strength and lasting strength at high temperature, long-term working temperature up to 500; The plasticity is medium and the weldability is poor when cold deformed. It is used as an important structural part working under high loads, such as transmission parts for vehicles and engines; Rotors, spindles, heavy-duty transmission shafts, and large-section parts of steam turbine generators.
Chemical Composition: Carbon C:
Silicon si:manganese mn:
Sulfur S: Permissible residual content
Phosphorus p: permissible residual content
Chromium Cr: Nickel Ni: Permissible Residual Content
Copper Cu: Permissible residual content
Molybdenum MO: Mechanical Properties:
Tensile Strength b (MPa): 985(100)Yield Strength S (MPa): 835(85)Elongation δ5 (12
Section shrinkage (45
Impact power AKV (J): 63
Impact toughness value kv (j cm2): 78(8)hardness: 229hb
Specimen size: The specimen blank size is 25mm
45 is a high-strength medium carbon quenched and tempered steel, with a certain plasticity and toughness, high strength, good cutting performance, but its welding performance is low, it should be preheated before welding, annealed after welding. The CR content is less than or equal to, and it is suitable for higher strength moving parts, such as air compressors, impellers, gears, etc. >>>More
There should be no problem with the strength, I have also used 20CR to do the test before, using high-frequency local quenching, and the two ends can also be riveted (HRC41 at both ends, HRC45 in the middle) Because of the cost factor, I want to change to 40CR quenching and tempering, and the hardness is about HRC34. In this way, both ends can also be riveted, and there is a certain wear resistance. Will 40cr quenching and tempering become brittle to this hardness, or will there be a big change in strength?
40Cr is an alloy structural steel, and chromium (Cr) is added to improve hardenability, which is generally used to do quenching and tempering treatment. >>>More
1. Quenching, normalizing, annealing, and tempering are all heat treatment processes of steel, and in order to achieve different properties of the workpiece, the heat treatment process to improve the internal structure of the workpiece is adopted. The difference between them is that the workpiece is heated to different temperatures first, and the workpiece is cooled in different cooling methods and cooling speeds to achieve the purpose of changing the metal structure. >>>More
W18CR4V belongs to the national standard high-speed tool steel, and the implementation standard: GB T 9943-2008 >>>More