Heat treatment and surface treatment method of mold steel SDCM1 for hot stamping

A surface treatment, die steel technology, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem that nitrided parts cannot withstand too high contact stress and impact load, long nitriding cycle, and high cost problem, to achieve the effect of enhanced wear resistance, improved surface strength, equipment and low cost

Inactive Publication Date: 2014-12-03
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] However, the nitriding cycle is long, generally dozens or even hundreds of hours, the cost is high, the nitrided layer is thin, generally 0.5mm, and the brittleness is high, so that the nitrided parts cannot withstand too high contact stress and impact load

Method used

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  • Heat treatment and surface treatment method of mold steel SDCM1 for hot stamping
  • Heat treatment and surface treatment method of mold steel SDCM1 for hot stamping
  • Heat treatment and surface treatment method of mold steel SDCM1 for hot stamping

Examples

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Embodiment 1

[0054] In this embodiment, a die steel SDCM1 for hot stamping is carried out for heat treatment and surface treatment. The specific process is as follows:

[0055] (a) Heat treatment process: Quenching at 1020°C, tempering at 595°C for 2 hours, and then tempering at 595°C for 2 hours. Under the conditions of this heat treatment process, the hardness and impact toughness: the hardness value is 51HRC, and the impact toughness value is 180J. Quenched and tempered microstructure such as figure 1 shown.

[0056] (b) Plasma nitriding process: voltage 850V, atmosphere ratio NH3:Ar=1:9, furnace pressure 450Pa, nitriding temperature 530°C, nitriding time 8h. After nitriding, the surface hardness is 810HV0.3, and the thickness of the nitriding layer is 225μm.

Embodiment 2

[0058] In this embodiment, a die steel SDCM1 for hot stamping is subjected to heat treatment and surface treatment. The specific process is as follows:

[0059] (a) Heat treatment process: Quenching at 1025°C, tempering at 600°C for 2 hours, and then tempering at 600°C for 2 hours. Under the conditions of this heat treatment process, the hardness and impact toughness: the hardness value is 51HRC, and the impact toughness value is 190J.

[0060] (b) Plasma nitriding process: voltage 880V, atmosphere ratio NH3:Ar=1:9, furnace pressure 525Pa, nitriding temperature 540°C, nitriding time 8h. After nitriding, the surface hardness is 860HV0.3, and the thickness of the nitrided layer is 264μm. figure 2 It is the metallographic 200× photo of the die steel section after heat treatment and surface treatment in this embodiment.

Embodiment 3

[0062] In this embodiment, a die steel SDCM1 for hot stamping is carried out for heat treatment and surface treatment. The specific process is as follows:

[0063] (a) Heat treatment process: Quenching at 1030°C, tempering at 605°C for 2 hours, and then tempering at 605°C for 2 hours. Under the conditions of this heat treatment process, the hardness and impact toughness: the hardness value is 52HRC, and the impact toughness value is 200J.

[0064] (b) Plasma nitriding process: voltage 900V, atmosphere ratio NH3:Ar=1:9, furnace pressure 450Pa, nitriding temperature 550°C, nitriding time 6h. After nitriding, the surface hardness is 850HV0.3, and the thickness of the nitriding layer is 190μm. image 3 It is the scanning electron microscope and point component analysis of the mold steel section after heat treatment and surface treatment in embodiment 3; Figure 4 Scanning electron microscope photos and EDS energy spectrum analysis for plasma surface nitriding; Figure 5 It is em...

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Abstract

The invention discloses a heat treatment and surface treatment method of a mold steel SDCM1 for hot stamping. The heat treatment and surface treatment method comprises quenching and tempering; the method comprises the following steps: vacuum heat treatment: the quenching temperature is 1010-1040 DEG C; two times of tempering: the tempering temperature is 580-610 DEG C; and surface plasma nitriding: the voltage is 600-900 V; the atmospheric specific value of NH3 to Ar is 1: (6-10); and the furnace pressure is 133-1066 Pa. A non-compound layer nitriding layer is obtained through controlling such parameters as plasma nitriding atmospheric ratio, nitriding time, furnace pressure, voltage and nitriding temperature. When the surface hardness of the mold is improved, the corrosion resistance, wear resistance and bonding resistance of the mold are optimized. The worn mold can be reused through repairing and secondary plasma nitriding so as to largely prolong the total service life of the mold. The equipment cost is lower; the workpiece size and shape are low in limitation; and the method can be totally applied to the actual production.

Description

technical field [0001] The invention relates to the field of die steel surface treatment, in particular to a heat treatment and surface treatment technology of die steel SDCM1 used in a hot stamping process. Background technique [0002] Die steel is usually divided into three categories according to the object of mold use: cold work die steel, hot work die steel and plastic mold steel. Hot stamping die steel belongs to hot work die steel. With the rapid development of the automobile industry and the continuous improvement of the demand for lightweight automobiles, the hot stamping forming process is mainly used to obtain ultra-high-strength stamping parts. When obtaining ultra-high-strength steel, due to the extremely high forming force required by the cold stamping forming process, it is easy to cause mold damage, equipment vibration, and problems such as cracking, wrinkling, rebound, and poor dimensional accuracy. Therefore, the original cold stamping forming process no...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D1/773C21D1/18C23C8/38
Inventor 郭瑞泉徐伟力罗爱辉吴彦骏洪振军
Owner BAOSHAN IRON & STEEL CO LTD
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