Brazing of Martensitic Stainless Steels Using Nickel Based Paste in Vacum Furnace

Abstract:

Martensitic stainless steels are widely used in the cutlery industry especially for food contact products. In this application, some properties are important like the corrosion resistance, toughness and edge retention - the latter strongly influenced by the cleanliness of the steel. However, steels with such properties tend to be expensive materials and have low weldability. The aim of this work is to develop a brazed joint between martensitic stainless steels Uddeholm Elmax and DIN EN 1.4110 in order to use the Uddeholm Elmax only in the cutting edge, reducing costs. A paste classified as DIN EN ISO 3677 B-Ni60CrPSi-980/1040 was used as filler metal. The tested parameters were: dwell time (5, 10 and 30 min) and brazing temperature (1080, 1100 e 1120 °C). The samples were submitted to tensile test as well as light microscope and SEM analysis, in addition to hardness and microhardness measurements. The highest values for the tensile test were found for the 10 min and 1120 °C brazed samples. It was possible to braze the materials according the objective of this work.

Key-words:
Brazing; Martensitic stainless steel; Nickel based filler metal; Quenching