Khi chúng ta nói về thép không gỉ trong bài phát biểu hàng ngày, chúng tôi có nghĩa là thép hợp kim bằng crom ít nhất 12%. Như là một kết quả của phản ứng với oxy trong không khí, ủng hộ tective hình thức oxit phim trên hợp kim này và ngăn ngừa lông Ther quá trình oxy hóa nhanh chóng. Thép không gỉ hiện đại ngày arealso thường hợp kim nickel và molypden, whichfurther tăng cường tính chất chống ăn mòn của họ. | Interim reprint AvestaPolarit Welding Stainless steels Stainless steels - their properties and their suitability for welding AvestaPolarit STAINLESS INDEX INTRODUCTION . 1 COMPOSITION AND MECHANICAL PROPERTIES. 1 PHYSICAL PROPERTIES . 2 CORROSION RESISTANCE PROPERTIES . 2 WELDABILITY . 3 FILLER METALS FOR STAINLESS STEELS. 4 FILLER METAL FORMS. 5 WELD DEFECTS PRACTICAL ADVICE . 6 POST-WELD TREATMENT . 7 The revisions made to this brochure concern the cover company name and logotype only which now adhere to AvestaPolarit s graphic profile. In all other respects the contents are identical with the information supplied in brochure 9473 2. STAINLESS STEELS Their properties and their suitability for welding by Bjorn Holmberg . INTRODUCTION When we speak of stainless steels in everyday speech we mean steels alloyed with at least 12 chromium. As a result of reactions with the oxygen in the air a protective oxide film forms on this alloy and prevents further rapid oxidation. Modern-day stainless steels are also usually alloyed with nickel and molybdenum which further enhances their corrosion resistance properties. The purpose of this lecture is to - shed light on the importance of microstructure for the corrosion resistance properties physical properties and mechanical properties of the steels and provide information on their weldability - give advice on the selection of filler metals for different steel grades - inform briefly on different filler metal forms - provide practical advice for the welding of stainless steels. COMPOSITION AND MECHANICAL PROPERTIES The mechanical properties corrosion resistance and weldability of a steel are largely determined by its microstructure. This is in turn determined chiefly by the chemical composition of the steel. Steels are divided into different groups in the following tables page 2 based on the predominant microstructure. Austenitic steels This type of stainless steel is dominant in the market. The group includes the very .
