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Bainite die steel in large section for plastic and preparation method

A technology of plastic mold steel and manufacturing method, which is applied in the field of metallurgy, can solve the problems of adverse effects on machinability and difficulty in producing large-section slabs, and achieve the effects of good uniformity of hardness distribution and reduction of segregation tendency

Active Publication Date: 2006-02-01
BAOSHAN IRON & STEEL CO LTD
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  • Description
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Problems solved by technology

Machinability is adversely affected due to the difference in structure between the core and other parts
Therefore, although the invention patent successfully adopts the composition design of non-quenched and tempered bainitic steel to produce thin-gauge slabs, it is difficult to produce high-quality large-section slabs with a thickness of more than 200 mm

Method used

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  • Bainite die steel in large section for plastic and preparation method
  • Bainite die steel in large section for plastic and preparation method
  • Bainite die steel in large section for plastic and preparation method

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Embodiment Construction

[0039]According to the design idea of ​​the above alloy composition, 5 furnaces of steel were smelted in the laboratory and cast into 100kg steel ingots. The chemical composition is shown in Table 2. For comparison, the composition of comparative example 1 quenched and tempered steel DIN2738 and industrially produced comparative example 2 non-quenched and tempered steel (CN98111772.4) are shown at the same time. It must be noted that a small amount of chromium and nickel were added in order to increase the hardness of the slab to the level of the comparative quenched and tempered steel DIN2738 during the industrial production of the non-quenched and tempered steel of Comparative Example 2 (CN98111772.4). The steel ingot was forged into a 150×300mm sample, which was air-cooled and sand-cooled to room temperature respectively. Metallographic samples were taken from the entire section of the test slab for microstructure observation and hardness measurement. The reason why air co...

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Abstract

A bainite steel used for large-cross section plastic mould contains C (0.05-0.19 Wt%), Si (0.1-0.6), Mn (1-1.65), V (0.04-0.2), Cr (1.0-1.70), Mo (0.15-0.50), P (0-0.02), S (0-0.01), Ni (0-0.5), N (0-0.01), Ti (0.005-0.025), Ca (0-0.005), Al (0.01-0.04) and Fe (rest). Its preparing process includes smelting in converter, refining, casting, heating, rolling, cooling, and tempering.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, relates to a quenching-free pre-hardened plastic mold steel, and is particularly suitable for manufacturing large-section plastic molds and a manufacturing method thereof. Background technique [0002] At present, the thickness of large plastic molds used for home appliances and automobiles can reach 500mm, such as molds for front and rear covers of TV sets, molds for washing machines, molds for air-conditioning shells, and molds for automobile bumpers. These molds are usually made of medium carbon chromium-nickel-molybdenum low alloy quenched and tempered steel, such as German standard, famous DIN2738. The typical chemical composition of the steel is shown in Table 1. [0003] Grade C Si mn Cr Ni Mo DIN2738 0.38 0.25 1.50 1.80 1.0 0.20 [0004] Due to the need for quenching and tempering treatment, the ha...

Claims

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Application Information

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IPC IPC(8): C22C38/50B29C33/38
Inventor 江来珠华蔚吕卫东
Owner BAOSHAN IRON & STEEL CO LTD
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