Automobile turbocharger shell cast steel material

Abstract

The invention belongs to the field of casting materials, and provides an automobile turbocharger shell cast steel material. The automobile turbocharger shell cast steel material is composed of the following components, by weight: 0.35%-0.50% of C, 1.0%-1.8% of Si, 9%-10% of Ni, 0.6%-1.1% of Nb, 0.15%-0.2% of N and the balance of Fe. The addition of precious elements of Ni and Nb in the material is particularly effectively controlled and reduced, and the current environmental protection concept is met; the high-temperature strength is improved, and the working temperature below 1050 DEG C can be continuously met; the Si content is reduced, and the toughness index of the product is improved; ni is reduced to 9-10%, so that the cost is greatly reduced, and formation of an austenite matrix structure can be ensured; Nb is reduced to 0.6-1.1%, the cost is greatly reduced, enough high-temperature structures are formed, and the strength is guaranteed; 0.15-0.2% of the nitrogen element is added, the nitrogen element is a strong austenitizing element, the increase of the content of the N element is beneficial for forming a single austenite structure, and formation of ferrite is inhibited. And a second phase NbN is formed by Nb, so that the effect of strengthening a matrix can be achieved.

Description

technical field [0001] The invention belongs to the field of casting materials, and in particular relates to a cast steel material for an automobile turbocharger housing. Background technique [0002] With the improvement of environmental protection emission requirements, the combustion degree of engine fuel needs to be more sufficient, and supercharging technology has emerged as the times require, and turbocharging technology is an ideal method that is both environmentally friendly and energy-saving. The turbocharger casing is a key component in turbocharging technology. The working temperature is gradually increasing, and some have reached above 1000°C. When the working temperature reaches above 1000°C, the working time of the turbocharger casing will be shortened, cracks will occur Failure, resulting in the failure of the normal operation of the supercharger assembly and the reduction of engine power. [0003] At present, the turbocharger housing is basically made of two...

AI Technical Summary

Problems solved by technology

Disadvantages of high-nickel austenitic materials: high Ni content, reaching 34-36%

Disadvantages of general austenitic heat-resistant steel materials: Generally, in order to ensure the single phase structure of austenitic materials, the amount of Ni is high, reaching 19-22%, and the price of Ni is high, resulting in high cost of the product, containing Nb at 1.5-1.8%. , Nb price is high, resulting in high product cost

The Si content is 2-2.5%, the C content is 0.3-0.4%, the product toughness is poor, and the elongation index is low

Images