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, can solve the problems of high material cost and achieve the effects of low raw material cost, improved toughness and wear resistance, and increased compressive strength

Inactive Publication Date: 2009-04-08
周向儒
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention adopts a special time-controlled rapid cooling process, which not only avoids the risk of cracking in brine quenching, but also greatly improves the quenching quality, effectively improves the im

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

[0044] A novel chromium-based hot work die steel of the present invention comprises:

[0045] Carbon C 0.45%, Silicon Si 0.80%, Manganese Mn 0.80%, Chromium Cr 9.00%,

[0046] Tungsten W 0.60%, Molybdenum Mo 0.60%, Vanadium V 0.50%, Nickel Ni 0.30%,

[0047] Sulfur S≤0.005%, phosphorus P≤0.030%, and the balance is iron Fe.

[0048] The steps of the heat treatment process for the above-mentioned novel chromium-based hot work die steel are as follows:

[0049] (1) Preheating: the preheating temperature is 580°C to 620°C, and the preheating time is 50 to 70 minutes;

[0050] (2) Quenching heating: the quenching heating temperature is 1020°C to 1050°C, oil cooling or air cooling or salt bath cooling is adopted, and the quenching time is 20 to 30 minutes;

[0051] (3) Tempering: the tempering temperature is 480°C to 500°C, and then air cooled to room temperature.

Embodiment 2

[0053] A novel chromium-based hot work die steel of the present invention comprises:

[0054] Carbon C 0.35%, Silicon Si 0.30%, Manganese Mn 0.30%, Chromium Cr 7.00%,

[0055] Tungsten W 0.40%, Molybdenum Mo 0.40%, Vanadium V 0.40%, Nickel Ni 0.10%,

[0056] Sulfur S≤0.005%, Phosphorus P≤0.030%, Niobium Nb0.30%, Titanium Ti0.30%,

[0057] Boron B 0.03%, the rest is iron Fe.

[0058] The steps of the heat treatment process for the above-mentioned novel chromium-based hot work die steel are as follows:

[0059] (1), the first preheating: the preheating temperature of all raw materials is 580C ~ 620C, and the preheating time is 50 ~ 70 minutes;

[0060] (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.

[0061] (3) Quenching heating: the quenching heating temperature is 1020°C to 1050°C, oil cooling or air cooling or salt bath coo...

Embodiment 3

[0065] A novel chromium-based hot work die steel of the present invention comprises:

[0066] Carbon C 0.70%, Silicon Si1.30%, Manganese Mn 1.30%, Chromium Cr11.00%,

[0067] Tungsten W 1.20%, Molybdenum Mo 1.20%, Vanadium V 1.00%, Nickel Ni1.00%,

[0068] Sulfur S≤0.005%, Phosphorus P≤0.030%, Niobium Nb0.30%, Titanium Ti0.30%,

[0069] Rare earth element 0.05%, nitrogen N 0.02%, nitride 0.02%, nitride is BN, and the rest is iron Fe. The steps of the heat treatment process for the above-mentioned novel chromium-based hot work die steel are as follows:

[0070] (1), the first preheating: the preheating temperature of all raw materials is 580 ℃ ~ 620 ℃, and the preheating time is 50 ~ 70 minutes;

[0071] (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.

[0072] (3) Quenching heating: the quenching heating temperature is 1020°C ...

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Abstract

The invention relates to novel chrome hot work die steel belonging to hot work die steel, particularly relating to the hot work die steel with low content of tungsten and the thermal treatment process thereof. The hot work die steel comprises 0.35-0.7 percent of C, 0.3-1.3 percent of Si, 0.3-1.3 percent of Mn, 7.0-11.0 percent of Cr, 0.4-1.2 percent of W, 0.4-1.2 percent of Mo, 0.4-1.2 percent of V, 1.0 percent of Ni, 0.005 percent or less of S, 0.030 percent or less of P, 0.03 percent of-0.10 percent of B, equal to or more than 0.02 percent and equal to or less than 0.20 percent of nitride, equal to or more than 0.02 percent and equal to or less than 0.10 percent of N, and the rest of Fe by weight percent. The steel of the invention has finer crystal grain, generates greatly increased heat resistance, toughness and compressive strength and has more than three times of durable frequencies than the existing die steel. The invention further provides the thermal treatment process with relatively low steel quenching temperature of 1020-1050 DEG C.

Description

technical field [0001] The invention belongs to a hot work die steel, in particular to a hot work die steel which uses a large amount of chromium Cr and reduces the use of molybdenum Mo and vanadium V and its heat treatment process. Background technique [0002] Hot work die steel requires materials with high hardenability, high temperature strength, high wear resistance, high toughness, high thermal cracking resistance and high melting loss resistance. In the United States, hot work die steel is divided into three types: chromium hot work die steel, tungsten hot work die steel and molybdenum hot work die steel, all of which are crowned with the letter H, respectively denoted as H10~H19, H21~H26 and H42, H43 Wait. Among them, the carbon content of the first two steels is in the range of (0.30-0.50)%, the carbon content of the latter steel is in the range of (0.50-0.70)%, the total of Cr, W, Mo and V alloy elements of the three steels The content is in the range of (6-25)%....

Claims

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Application Information

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IPC IPC(8): C22C38/46C21D1/18
Inventor 周向儒
Owner 周向儒
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