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Plastic mould steel and production technology thereof

A plastic mold steel and production process technology, applied in the field of iron and steel smelting, can solve the problems of low strength and hardness, achieve the effect of improving internal porosity, high hardness, and bridging the original loose defects

Inactive Publication Date: 2018-05-29
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing plastic mold steel has the problem of relatively low strength and hardness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A plastic mold steel, the chemical composition of which is calculated by mass percentage: C: 0.37%, Si: 0.4%, Mn: 1.4%, Cr: 1.8%, Mo: 0.4%, Ni: 1.0%, P≤0.008%, S≤0.003%, Als: 0.018-0.030%, and the rest is Fe and residual elements; the thickness of the plastic mold steel is 150mm, and the carbon equivalent in the chemical composition of the plastic mold steel is 1.1.

[0035] A kind of production technology of plastic mold steel, this production technology comprises the steps:

[0036] Step 1: Desulfurization of KR molten iron: Slag removal treatment is carried out on the molten iron at the station. It is required to completely remove the slag before and after the desulfurization, and the mass percentage of S in the molten iron after desulfurization is ≤0.003%;

[0037] Step 2: Converter smelting: The temperature of molten iron entering the furnace is ≥1300°C. During the smelting process, high-Cr alloy scrap, high-Mo alloy scrap and high-Ni alloy scrap are added, and the...

Embodiment 2

[0047] A plastic mold steel, the chemical composition of which is calculated by mass percentage: C: 0.40%, Si: 0.5%, Mn: 1.5%, Cr: 2.0%, Mo: 0.5%, Ni: 1.1%, P≤0.008%, S≤0.003%, Als: 0.018-0.030%, and the rest is Fe and residual elements; the thickness of the plastic mold steel is 150mm, and the carbon equivalent in the chemical composition of the plastic mold steel is 1.3.

[0048] A kind of production technology of plastic mold steel, this production technology comprises the steps:

[0049] Step 1: Desulfurization of KR molten iron: Slag removal treatment is carried out on the molten iron at the station. It is required to completely remove the slag before and after the desulfurization, and the mass percentage of S in the molten iron after desulfurization is ≤0.003%;

[0050] Step 2: Converter smelting: The temperature of molten iron entering the furnace is ≥1300°C. During the smelting process, high-Cr alloy scrap, high-Mo alloy scrap and high-Ni alloy scrap are added, and the...

Embodiment 3

[0060] A plastic mold steel, the chemical composition of which is calculated by mass percentage: C: 0.385%, Si: 0.45%, Mn: 1.45%, Cr: 1.9%, Mo: 0.45%, Ni: 1.05%, P≤0.008%, S≤0.003%, Als: 0.018-0.030%, and the rest is Fe and residual elements; the thickness of the plastic mold steel is 150mm, and the carbon equivalent in the chemical composition of the plastic mold steel is 1.2.

[0061] A kind of production technology of plastic mold steel, this production technology comprises the steps:

[0062] Step 1: Desulfurization of KR molten iron: Slag removal treatment is carried out on the molten iron at the station. It is required to completely remove the slag before and after the desulfurization, and the mass percentage of S in the molten iron after desulfurization is ≤0.003%;

[0063] Step 2: Converter smelting: The temperature of molten iron entering the furnace is ≥1300°C. During the smelting process, high-Cr alloy scrap, high-Mo alloy scrap and high-Ni alloy scrap are added, an...

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Abstract

The invention belongs to plastic mould steel and a production technology thereof. The plastic mould steel comprises the chemical compositions of, by mass, 0.37-0.40% of C, 0.4-0.5% of Si, 1.4-1.5% ofMn, 1.8-2.0% of Cr, 0.4-0.5% of Mo, 1.0-1.1% of Ni, no more than 0.008% of P, no more than 0.003% of S, 0.018-0.030% of Als, and the balance Fe and remaining elements. The thickness of the plastic mould steel is 150 mm, the carbon equivalent in the chemical compositions of the plastic mould steel is 1.1-1.3, and the plastic mould steel has the advantages of being high in strength, high in hardnessand excellent in performance.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a plastic mold steel and a production process thereof. Background technique [0002] Plastic mold steel is also called HY718 mold steel. HY718 mold steel is a brand of pre-hardened hot-work mold steel. This steel has excellent mechanical properties and machinability. It is used in the mold industry, especially in the field of plastic mold processing and production. quite broad. In addition, its special production process makes HY718 mold steel already have a hardness of 330-370HBW when it leaves the factory, so it can reduce the heat treatment link in the normal mold processing and production and improve economic benefits. Except that it cannot be used for plastic mold parts with corrosion resistance requirements, it is currently the most widely used typical steel grade for general-purpose plastic mold steel. It is usually called "advanced" plastic m...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C33/04C21D8/02C21D9/00
CPCC21D8/0226C21D9/0081C22C33/04C22C38/02C22C38/04C22C38/06C22C38/44Y02P10/20
Inventor 许少普
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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