Low-cost Mo-free plastic mould steel plate and production technology thereof

A technology of plastic mold steel and production process, applied in the field of plastic mold steel, can solve the problems of low production efficiency, long production cycle, rising production cost, etc., and achieve the effect of short production cycle, low alloy cost and large process window.

Active Publication Date: 2014-08-13
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is die casting, forging or off-line heat treatment, the production cycle is long and the production efficiency is low. At the same time, the extra casting, forging, quenching, normalizing and other processes make the production cost rise sharply

Method used

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  • Low-cost Mo-free plastic mould steel plate and production technology thereof
  • Low-cost Mo-free plastic mould steel plate and production technology thereof
  • Low-cost Mo-free plastic mould steel plate and production technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The steel is composed of the following components (wt%): C: 0.39%, Si: 0.30%, Mn: 0.58%, P≤0.020%, S≤0.010%, Cr: 1.25~1.55%, Nb: 0~0.015% , B: 0.0020%, the rest is Fe and unavoidable impurities, wherein Cr / Mn is 2.1-2.6, and Si+Cr+Mn is 2.1%-2.4%.

[0031] (1) according to above-mentioned chemical composition weight percent, carry out smelting with 180 tons of converters, continuous casting becomes the continuous casting slab of 220mm;

[0032] (2) In the heating process, the continuous casting slab is heated at a temperature of 1170-1210°C, and the heating method is heated to 800°C at a speed of 10-20°C / min, and then kept at a temperature of 15 minutes. Continue heating, and heat up at a speed of ≤5°C / min Keep warm at 1170-1210°C for 60-90 minutes, and roll the soaked slab into a 30mm thick plate by hot rolling on a 5m wide plate rolling mill;

[0033] (3) In the hot rolling process, the hot rolling temperature is 980 ~ 1120 ℃, the pass deformation rate? 15%; after r...

Embodiment 2

[0036] The steel is composed of the following components C: 0.39%, Si: 0.30%, Mn: 0.58%, P≤0.020%, S≤0.010%, Cr: 1.25~1.55%, Nb: 0~0.015%, B: 0.0020% , and the rest are Fe and unavoidable impurities, among which Cr / Mn is 2.1-2.6, and Si+Cr+Mn is 2.1%-2.4%.

[0037] (1) according to above-mentioned chemical composition weight percent, carry out smelting with 180 tons of converters, continuous casting becomes the continuous casting slab of 220mm;

[0038] (2) In the heating process, the continuous casting slab is heated at a temperature of 1170-1210°C, and the heating method is heated to 800°C at a speed of 10-20°C / min, and then kept at a temperature of 15 minutes. Continue heating, and heat up at a speed of ≤5°C / min Keep warm at 1170-1210°C for 60-90 minutes, and roll the soaked slab into a 70mm thick plate by hot rolling on a 5m wide plate rolling mill;

[0039] (3) In the hot rolling process, the hot rolling temperature is 980 ~ 1120 ℃, the pass deformation rate? 15%; after...

Embodiment 3

[0042] The steel is composed of the following components (wt%): C: 0.39%, Si: 0.30%, Mn: 0.58%, P≤0.020%, S≤0.010%, Cr: 1.25~1.55%, Nb: 0~0.015% , B: 0.0020%, the rest is Fe and unavoidable impurities, wherein Cr / Mn is 2.1-2.6, and Si+Cr+Mn is 2.1%-2.4%.

[0043] (1) according to the chemical composition weight percentage described in claim 1, smelting is carried out with 180 tons of converters, and continuous casting becomes the thick continuous casting slab of 320mm;

[0044] (2) In the heating process, the heating temperature of the continuous casting slab is 1170-1210°C, and the heating method is heated to 800°C at a speed of 10-20°C / min, and then kept for 30 minutes, and the heating is continued, and the temperature is raised at a speed of ≤10°C / min Keep warm at 1170-1210°C for 60-90 minutes, and roll the soaked slab into a 105mm thick plate by hot rolling on a 5m wide plate rolling mill;

[0045] (3) In the hot rolling process, the hot rolling temperature is 980 ~ 1120 ...

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Abstract

The invention relates to a low-cost Mo-free plastic mould steel plate and a production technology thereof. The low-cost Mo-free plastic mould steel plate comprises the following chemical components in percentage by weight: 0.36-0.42% of C, 0.26-0.34% of Si, 0.55-0.59% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 1.25-1.55% of Cr, 0-0.015% of Nb, 0.0015-0.0025% of B and the balance of Fe and inevitable impurities, wherein Cr / Mn is 2.1-2.6, and Si+Cr+Mn is 2.1%-2.4%. The low-cost Mo-free plastic mould steel plate has the advantages that a hot rolling+online quenching+tempering technology is adopted, the structure of the steel plate is martensite, martensite+bainite or martensite+bainite+few pearlites, and the hardness of the low-cost Mo-free plastic mould steel plate is 28-34HRC (Rockwell hardness). The low-cost Mo-free plastic mould steel plate does not contain valuable alloys such as Mo, is simple in process, short in period and low in cost and can be widely applied to various plastic molds.

Description

technical field [0001] The invention relates to a plastic mold steel plate, in particular to a low-cost Mo-free plastic mold steel plate and a production process thereof, belonging to the field of plastic mold steel. Background technique [0002] Molds are the basic technological equipment for mass production of industrial products. 70% of rough machining and 5% of finishing machining of industrial parts in machinery manufacturing need molds to complete. Plastic mold steel is an important mold material, which is widely used in various industries such as household appliances, electronics and communication equipment, plastic products, automobiles and motorcycles. [0003] With the rapid development of world steel production, the price of Mo, Ni, V and other metal raw materials has soared, causing the price of plastic mold steel to also continue to rise. The development of low-cost, Mo-free and plastic mold steel with a hardness of 28-34HRC has become an important topic for mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C21D8/02
Inventor 镇凡张宽杨浩曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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