Mechanical properties of commonly used carbon tool steel grades and common carbon tool steels

The carbon tool steels commonly used in cold working molds are T7A, T8A, T10A, T12A and so on. High-quality carbon tool steel can be sent to Shenzhen Yihuajia Mould Steel Co., Ltd. to sell all kinds of high-quality carbon tool steel with A in the back of the steel, representing high-quality steel, its carbon mass fraction 0.02%, phosphorus mass fraction The town is 0.03%. The effect of carbon content on the mechanical properties of commonly used carbon tool steels The hardness of commonly used carbon tool steels depends mainly on the size of the mold and the carbon content of the steel. The higher the carbon content, the higher the hardness.

After the work of diameter Φl~5mm is quenched in water, when the carbon content is 0.06%~7%, the hardness can reach 62^63HRC, but for the larger diameter workpiece to obtain the same surface hardness, the carbon content must be made. When increased to 0.09%~1% or more, the hardness can be increased to 65HRC

The wear resistance of steel depends on the hardness. When the hardness of the carbon tool steel is below 60 v62HRC, the wear resistance is drastically reduced. Wear resistance is also related to the retained austenite in steel, morphology and distribution. Under normal circumstances, the carbon content is extremely high, and the wear resistance is better. For example, T12 steel has slightly higher wear resistance than T10 steel. The toughness of the steel decreases with the increase of the carbon content, and the strength of the steel increases with the increase of the carbon content, when the carbon mass fraction side c is. .6% one. At .7%, the maximum value is reached, and then decreases. When the composition is close to the eutectoid component, the intensity is the lowest. The carbon content continued to increase, and the strength increased twice. However, when the carbon mass fraction exceeded 1.2%, the cementite was unevenly distributed and the strength decreased.

Effect of Quenching Temperature of Common Carbon Tool Steel

Increasing the quenching temperature reduces the toughness of the carbon tool steel, but appropriately increasing the quenching temperature increases the thickness of the hardened layer, thereby increasing the load carrying capacity of the mold. Therefore, for small molds that are easy to harden, a lower quenching temperature (760^7800C) can be used, while for large and medium-sized molds, the quenching temperature (800-8500C) should be appropriately increased or a high-temperature rapid heating process can be used.

Effect of tempering temperature of common carbon tool steel

The hardness of carbon tool steel decreases with the increase of tempering temperature. After tempering at 150---3000C, the flexural strength and impact toughness increase significantly with the increase of tempering temperature, and the highest temperature appears. It is related to the carbon content. Therefore, the optimum tempering temperature should be selected according to different steel numbers.

[Original from: Shenzhen Yihuajia Mould Steel Technology Service Center, please indicate the source]

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