What is the hardness of No. 45 steel after quenching and tempering at different temperatures?

The quenching temperature of No. 45 steel is about 820 840 degrees, which is adjusted according to the specific parts, and the tempering temperature is adjusted according to the technical requirements.

Reply 10 Weeks Hello! I mean, if you quench to HRC59 or above, refer to this tempering temperature, the landlord does not have the size of the workpiece, it is not good to say what medium to choose, 45 steel with a diameter of 28.

Can't the crank quenched to HRC54-55 heart with clean water reach level 4? We make 45 steel cranks about 2000 pieces a day, every day. It's all about heat treatment, and there is no need to stipulate to the landlord what furnace type to use for tempering and how long it will take.

According to their own conditions, as long as the tempering temperature is uniform, the tempering is sufficient. It would be nice to adjust it yourself.

Complex. Zhou Gong said that the quenching HRC59 reference fire temperature, the landlord did not have the size of the workpiece, said that the selection of medium diameter 28 45 steel crank with clean water quenching HRC54-55 can reach level 4, I 45 steel crank every 2000 pieces or so to do heat treatment, there is no need to give the landlord a furnace type of fire, according to the conditions to the fire temperature uniform, fire charge self-adjustment.

You can check the material manual About quenching + tempering process Look at your needs to determine the process.

Reply 3 Can you specify which material manual it is?

What 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!

What is the "tempering" temperature of 45 steel?

Quenching temperature: 840 °C, water quenching, tempering temperature 150 °C, hardening of about 57 hrc, tempering temperature of 200 °C, hardness of about 55 hrc, tempering temperature of 250 °C, hardness of about 53 hrc, tempering temperature of 300 °C, hardness of about 48 hrc, tempering temperature of 350 °C, hardness of about 45hrc, tempering temperature of 400 °C, hardness of about 43hrc, tempering temperature of 500 °C, hardness of about 33hrc, tempering temperature of 600 °C hardness is about 20HRC.

Before tempering after quenching, the hardness of No. 45 steel is greater than HRC55 (up to HRC62) is qualified, and the highest hardness for practical application is HRC55 (high-frequency quenching HRC58).

Normalizing can improve the cutting performance of blanks with a hardness of less than 160HBS. After quenching and tempering, the comprehensive mechanical properties of the steel should be optimized compared with other medium-carbon structural steels, but the hardenability of the steel is low, the critical quenching diameter in water is 12 17mm, and there is a tendency to crack when water quenching. When the diameter is greater than 80mm, after quenching or normalizing, its mechanical properties are similar, and higher strength and toughness can be obtained after quenching and tempering of small and medium-sized mold parts, while large parts are suitable for normalizing treatment, so this steel is usually used in the quenched and tempered or normalized state.

Summary. Hello dear, 1. It can be quenched twice.

2. The quenching of steel is a heat treatment process in which the steel is heated to a temperature above the critical temperature AC3 (sub-eutectic steel) or AC1 (super-eutectic steel), kept warm for a period of time to make it fully or partially austenitized, and then cooled to below ms (or isothermal near ms) at a cold rate greater than the critical cooling rate for martensite (or bainite) transformation. Solution treatment of materials such as aluminum alloys, copper alloys, titanium alloys, tempered glass, etc., or heat treatment processes with a rapid cooling process are usually referred to as quenching.

After the first quenching of No. 45 steel, the hardness is not enough, can it be quenched twice?

Hello dear, 1. It can be quenched twice. 2. The quenching of steel is a heat treatment process in which the steel is heated to a temperature above the critical temperature AC3 (sub-eutectic steel) or AC1 (super-eutectic steel), kept warm for a period of time to make it fully or partially austenitized, and then cooled to below ms (or isothermal near ms) at a cold rate greater than the critical cooling rate for martensite (or bainite) transformation. Solution treatment of materials such as aluminum alloys, copper alloys, titanium alloys, tempered glass, etc., or heat treatment processes with a rapid cooling process are usually referred to as quenching.

Okay thank you. Can quenching fail to be quenched twice?

Hello, yes, I hope it can help you. If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. Finally, I wish you good health and a good mood!

The hardness of No. 45 steel itself is HB: 197;After quenching, the hardness is not lower than HRC48.

No. 45 steel corresponds to the Japanese standard S45C, the American standard 1045, and the German standard steel is a medium carbon structural steel, with good cold and hot processing performance, good mechanical properties, and low and wide, so it is widely used. Its biggest weakness is that it has low hardenability, and the workpiece with large cross-sectional size and high requirements is not suitable for use.

The quenched and tempered hardness of 45 steel is between HRC20 and HRC30, and the hardness of No. 45 steel plate is greater than HRC55 (up to HRC62) before tempering, and the high-temperature tempering of No. 45 steel after quenching is usually 560 600, and the hardness requirement is HRC22 34.

No. 45 steel is widely used in machinery, when not heat-treated: HB 229;Heat Treatment: Normalizing; Impact power: aku 39j; The strength is high, and the plasticity and toughness are good.

The hardness of No. 45 steel itself reaches 600MPa, and it can reach HRC50 after quenching.

The tensile strength of 45 steel is 600MPa, the yield strength is 355MPa, the elongation is 16%, the section shrinkage is 40%, the impact energy is 850 normalizing, 840 quenching, 600 tempering, and the performance achieved is 355MPa.

Less than HRC 19 (Rockwell) I'm straight to the picture! I've also made bets with others! Really soft!

I've tested it with a hardness tester! I do not deal with 17 degrees! It's too soft.

The steelmaking technology in China has left your world, just like the domestic aircraft carrier that has just been put into service, and the Liaoning ship has just been our country's own Okamoto of the 15th, how much is that? Can you search the Internet?

If you make standard parts, you can only increase the surface hardness.

The hardness after quenching 225HB is not easy to say Look at the tempering temperature.