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Novel chromium system hot die steel and thermal treatment process thereof

A technology of hot work die steel and chromium series, which is applied in the field of hot work die steel to achieve the effect of increasing toughness and compressive strength

Inactive Publication Date: 2009-02-18
周向儒
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel has a high content of chromium Cr and silicon Si, but the range of Cr content 7.000~13.000 is too wide to be a kind of steel.

Method used

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  • Novel chromium system hot die steel and thermal treatment process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A novel chromium-based hot work die steel of the present invention comprises:

[0048] Carbon C 0.65%, Silicon Si 0.30%, Manganese Mn 0.30%, Chromium Cr 7.00%,

[0049] Tungsten W 1.80%, Molybdenum Mo 1.40%, Vanadium V 0.50%, Cobalt Co 0.50%,

[0050] Nickel Ni 0.50%, sulfur S≤0.005%, phosphorus P≤0.030%, the rest is iron Fe,

[0051] The steps of the heat treatment process for the above-mentioned novel chromium-based hot work die steel are as follows:

[0052] (1), preheating: preheating temperature of all raw materials is 580 ℃ ~ 620 ℃, preheating time is 50 ~ 70 minutes;

[0053] (2) Quenching heating: the quenching heating temperature is 1050°C to 1090°C, oil cooling or air cooling or salt bath cooling is adopted, and the quenching time is 20 to 30 minutes;

[0054] (3) Tempering: the tempering temperature is 520°C to 540°C, and then air cooled to room temperature.

Embodiment 2

[0056] A novel chromium-based hot work die steel of the present invention comprises:

[0057] Carbon C 0.65%, Silicon Si 0.30%, Manganese Mn 0.30%, Chromium Cr 6.50%,

[0058] Tungsten W 1.80%, Molybdenum Mo 1.40%, Vanadium V 0.50%, Cobalt Co 0.50%,

[0059] Nickel Ni 0.50%, sulfur S≤0.005%, phosphorus P≤0.030%, niobium Nb0.30%,

[0060] Titanium Ti0.30%, rare earth elements 0.05%, boron B 0.04%, and the balance is iron Fe.

[0061] The steps of the heat treatment process for the above-mentioned novel chromium-based hot work die steel are as follows:

[0062] (1), the first preheating: the preheating temperature of all raw materials is 580 ℃ ~ 620 ℃, and the preheating time is 50 ~ 70 minutes;

[0063] (2), the second preheating: after the first preheating, the second preheating, and then quenching, the second preheating temperature is 850 ℃ ~ 900 ℃, the second preheating time is 40 ~ 50 minute.

[0064] (3) Quenching heating: the quenching heating temperature is 1050°C t...

Embodiment 3

[0068] A novel chromium-based hot work die steel of the present invention comprises:

[0069] Carbon C 0.65%, Silicon Si 0.30%, Manganese Mn 0.30%, Chromium Cr 6.50%,

[0070] Tungsten W 1.80%, Molybdenum Mo 1.40%, Vanadium V 0.50%, Cobalt Co 0.50%,

[0071] Nickel Ni 0.50%, Sulfur S≤0.005%, Phosphorus P≤0.030%, Niobium Nb0.30%,

[0072] Titanium Ti0.30%, rare earth element 0.05%, boron B 0.08%, boron nitride BN 0.02%, and the balance is iron Fe.

[0073] The steps of the heat treatment process for the above-mentioned novel chromium-based hot work die steel are as follows:

[0074] (1), the first preheating: the preheating temperature of all raw materials is 580 ℃ ~ 620 ℃, and the preheating time is 50 ~ 70 minutes;

[0075] (2), the second preheating: after the first preheating, the second preheating, and then quenching, the second preheating temperature is 850 ℃ ~ 900 ℃, the second preheating time is 40 ~ 50 minute.

[0076] (3) Quenching heating: the quenching heating ...

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Abstract

The invention relates to chromium hot work die steel which belongs to hot work die steel, in particular to hot work die steel containing lower tungsten and a thermal processing technique thereof. Counted by weight percentage, the die steel includes 0.3 to 0.8 percent of C, 0.2 to 0.8 percent of Si, 0.2 to 0.8 percent of Mn, 6.0 to 8.0 percent of Cr, 1.0 to 2.4 percent of W, 0.8 to 2.0 percent of Mo, 0.3 to 1.0 percent of V, 0.3 to 8.0 percent of Co, 0.3 to 1.5 percent of Ni, equal to or less than 0.005 percent of S, equal to or less than 0.030 percent of P and 0.03 to 0.10 percent of B; the content range of a nitride is as follows: the nitride is equal to or more than 0.02 percent, or equal to or less than 0.20 percent; the content range of N is as follows: the N is equal to or more than 0.02 percent, or equal to or less than 0.10 percent; and the rest is Fe. The grains of the steel are thinner; the effects of greatly increased heat resistance, toughness and anti-pressing intensity are generated; the rigidity is between 55 and 61HRC which is more than three times than the durable times of the existing die steel. The invention also provides a thermal processing technique with a lower quenching temperature between 1050 and 1090 DEG C for the steel.

Description

technical field [0001] The invention belongs to a hot work die steel, in particular to a hot work die steel in which tungsten W is replaced by a large amount of chromium Cr and a heat treatment process thereof. Background technique [0002] The hot work die steel 3Cr2W8V steel commonly used in my country is widely used as black and non-ferrous metal hot extrusion dies. This kind of steel has high thermal stability, and the service temperature can reach 650°C, but the thermal conductivity of tungsten-based hot work die steel is low, and the cold and heat fatigue is poor. Nanjing University of Science and Technology conducted a study on the thermal fatigue properties of 3Cr2W8V hot work die steel, and concluded that the best possible solution is: 830℃×2h+730℃×4h spheroidizing annealing, 1150℃×30min quenching, 630℃×2h tempering 2 times. The quenching temperature of 1150°C cannot be reached with a general box-type electric furnace, which is inconvenient for quenching and deliv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C21D1/18
Inventor 周向儒
Owner 周向儒
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