4140 plastic die steel plate with delivery in annealed state and production method of 4140 plastic die steel plate

A technology of plastic mold and production method, applied in the field of plastic mold steel, can solve the problems of long process time, high energy consumption, not suitable for the production of medium and heavy plate products, etc. Effect

Active Publication Date: 2018-06-15
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 4140 die steel delivered in the traditional annealed state adopts the isothermal annealing process, which takes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] The thickness of the 4140 plastic mold steel plate delivered in the annealed state of this embodiment is 10mm, and its chemical composition and mass percentage are: C: 0.38%, Mn: 0.75%, Si: 0.15%, S: 0.015%, P: 0.020 %, Cr: 0.80%, Mo: 0.15%, Al: 0.005%, the rest is iron and unavoidable impurities.

[0021] The production method of the 4140 plastic mold steel plate delivered in the annealed state of this embodiment includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and cold rolling, and high temperature tempering heat treatment. The specific process steps are as follows Description:

[0022] (1) Converter smelting process: the molten iron into the converter has a sulfur content of 0.050%, and the ferromolybdenum is added to the converter at 3.5kg / t steel and scrap; the final carbon of the converter smelting is 0.10%, and the converter starts at 1 / 4 when the converter is tapped. Add steel grit al...

Example Embodiment

[0029] Example 2

[0030] The thickness of the 4140 plastic mold steel plate delivered in the annealed state of this embodiment is 150mm, and its chemical composition and mass percentage are: C: 0.43%, Mn: 1.00%, Si: 0.35%, S: 0.015%, P: 0.020 %, Cr: 1.10%, Mo: 0.25%, Al: 0.025%, the rest is iron and unavoidable impurities.

[0031] The production method of the 4140 plastic mold steel plate delivered in the annealed state of this embodiment includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and cold rolling, and high temperature tempering heat treatment. The specific process steps are as follows Description:

[0032] (1) Converter smelting process: the molten iron into the converter, the sulfur content is 0.060%, the molten iron is pretreated and then loaded into the converter, the ferromolybdenum is added to the converter at 3.8kg / t steel and scrap; the final carbon of the converter smelting is 0.20%, the converter At ...

Example Embodiment

[0039] Example 3

[0040] The thickness of the 4140 plastic mold steel plate delivered in the annealed state of this embodiment is 100mm, and its chemical composition and mass percentage are: C: 0.41%, Mn: 0.90%, Si: 0.30%, S: 0.015%, P: 0.020 %, Cr: 1.00%, Mo: 0.20%, Al: 0.020%, the rest is iron and unavoidable impurities.

[0041] The production method of the 4140 plastic mold steel plate delivered in the annealed state of this embodiment includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and cold rolling, and high temperature tempering heat treatment. The specific process steps are as follows Description:

[0042] (1) Converter smelting process: The molten iron into the converter has a sulfur content of 0.040%, and ferromolybdenum is added to the converter at 3.8kg / t steel and scrap; the final carbon of the converter smelting is 0.15%, and the converter starts at 1 / 4 of the time when the converter is tapped. Add stee...

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Abstract

The invention discloses a 4140 plastic die steel plate with delivery in an annealed state and a production method of the 4140 plastic die steel plate. The plastic die steel plate is prepared from thefollowing chemical compositions in percentage by mass: 0.38-0.43 percent of C, 0.75-1.00 percent of Mn, 0.15-0.35 percent of Si, smaller than or equal to 0.015 percent of S, smaller than or equal to 0.020 percent of P, 0.80-1.10 percent of Cr, 0.15-0.25 percent of Mo, 0.005-0.025 percent of Al and the balance of iron and inevitable impurities. The production method comprises the following procedures of converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and cooling rolling and high-temperature tempering heat treatment. According to the production method provided by the invention, the Al content is controlled to be 0.005-0.025 percent, other precious alloying elements such as Nb, Ti and V are not added, and the hardness of the steel plateis smaller than or equal to 230HB by adopting a high-temperature tempering heat treatment technology, so that the technology is simple, and the production cost is effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of plastic mold steel, and in particular relates to a 4140 plastic mold steel plate delivered in an annealed state and a production method thereof. Background technique [0002] Plastic mold steel, as a molding mold material for the manufacture of plastic and rubber products, is widely used in the manufacture of plastic products in various industries such as household appliances, electronic communication equipment, living utensils, and vehicles. [0003] AISI 4140 plastic mold steel is a plastic mold steel with low alloy content and cost advantages. When delivered in the annealed state, the hardness is generally required to be ≤230HB. The 4140 die steel delivered in the traditional annealed state adopts the isothermal annealing process, which takes a long time and consumes a lot of energy, which is not suitable for the production of medium and thick plate products. Contents of the invention [0004] The ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/22C21C7/10C21D1/18
CPCC21C7/10C21D1/18C22C38/02C22C38/04C22C38/06C22C38/22
Inventor 任树洋李行尹绍江秦坤王云阁石晓伟张锦兴万焱刘志勇
Owner TANGSHAN IRON & STEEL GROUP
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