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Composite microalloyed large-section non-quenched and tempered steel

A non-quenched and tempered steel, micro-alloying technology, applied in the direction of metal rolling, metal rolling, metal processing equipment, etc., can solve the problems of affecting the quality of parts, oil fume pollution of the environment, consumption of quenching oil, etc., to improve fatigue strength, The effect of saving energy and improving the performance of the half shaft

Active Publication Date: 2013-04-03
HENAN SUDA ELECTRIC AUTOMOBILE TECH
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  • Abstract
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  • Claims
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Problems solved by technology

Therefore, about 110,000 tons of CO2 emissions are produced by quenching and tempering automobile axle shafts every year; at the same time, quenching and tempering treatment also consumes quenching oil, and the oil fume produced pollutes the environment, cleaning wastes water sources, and the quenching process also causes parts to deform and oxidize Decarburization, which affects the quality of the part

Method used

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  • Composite microalloyed large-section non-quenched and tempered steel

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Embodiment

[0016] Embodiment, a large-section non-quenched and tempered steel with composite microalloying, its chemical composition is calculated by weight percentage: C 0.39, Si 0.30, Mn 1.20, P 0.014, S 0.008, Cr 0.50, Al 0.016, Ti 0.028, V 0.119, Nb 0.018, B 0.0012.

[0017] The bulldozer semi-shaft process that the above-mentioned embodiment material is made is as follows:

[0018] 100t EAF→100tLF→100t VD→CCM (340*300mm)→slow cooling or warm delivery→heating and rolling→controlled cooling→cutting→straightening→chamfering→inspection, grinding→packing and storage. The smelted steel is cast into a 340×300 mm continuous casting slab, and then forged and rolled. The heating temperature is 1180±20°C, the initial rolling temperature is 1100°C, the final rolling temperature is 900°C, and the cooling is controlled after rolling. The rolled product size is ?60mm, cooling rate 10℃ / s;

[0019] Round steel blanking→straightening→cutting—rolling or milling splines→induction hardening→cleaning, ...

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Abstract

The invention discloses composite microalloyed large-section non-quenched and tempered steel, specifically relates to large-section rolled non-quenched and tempered steel used for a half shaft of an automobile and non-quenched and tempered steel used for a half shaft of an engineering machinery. On one hand, the strength of the large-section non-quenched and tempered steel is increased through increasing C content, and on the other hand, grains are further refined through adding microalloy elements such as Nb, V and Ti, thus maintaining certain toughness while improving strength; in addition,the fatigue strength of the half shaft is improved through employing an induction hardening method, and the hardenability of steel is improved through adding B. The invention effectively solves the use strength requirement of the large-section non-quenched and tempered steel half shaft, guarantees the fatigue life of the half shaft, improves the performance of the half shaft, lowers the cost of the half shafts, saves energy and reduces heat treatment deformation.

Description

technical field [0001] The invention relates to rolled non-quenched and tempered steel for large-section automobile half shafts and non-quenched and tempered steel for engineering machinery half shafts. Background technique [0002] While automobiles bring convenience to people's travel, they also create three major problems: fuel consumption, safety and environmental protection. How to reduce energy consumption in the automobile manufacturing process, improve the service life of automobiles, and reduce the manufacturing cost of parts is the focus of the automobile industry. important technical issue. [0003] Among auto parts, there are a large number of shaft parts. For example, there are 2-4 semi-axles in each car, the semi-axles of light vehicles weigh more than 10 kilograms each, and the semi-axles of heavy vehicles weigh more than 20 kilograms. These shaft parts, especially the semi-axles, are mostly made of quenched and tempered steel. When the output reaches 18 mil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/32B21B37/16B21B37/74
Inventor 马鸣图田庆亮杨红亚赵国刚卢南法张伟梅华生侯豁然张帷
Owner HENAN SUDA ELECTRIC AUTOMOBILE TECH
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