347 (1.4550) Stainless Steel

347 stainless steel can witdh stand to high temperature and this grade has a good corosion resistance in temperatures between 400 to 800 degree. This grade is written as 1.4550 or X6CrNiNb18-10 according to EN norm and it is written as UNS S34700 according to UNS norm. 347 material is a high temperature grade and it is designed for temperatures between 400 to 800 degree. 347 stainless can not be heat threated and it has a similar corrosion resistance to 321 and 304 grade stainless steels. 347 stainless is similar to 321 (1.4541) grade for many applications and this grade can weld easiliy. The most important elements in 1.4550 material are niobium and tantalum, which makes this grade have more stabilized structure. 347 stainless steel used in chemical industry, food production facilities, food storage equipment, oil refinery parts, waste treatment plants.



Grade Properties

General Properties Stars
Corrosion Resistance:
Mechanical Properties:






347 (1.4550) Grade Material Stock List

Material Shape Min Diameter (mm)

Max Diameter (mm)

Round 50 80




347 (1.4550) Chemical Composition

Grade C Mn P S Si Cr Ni Niyobium and Tantalium (Nb & Ta)
347 (1.4550) %0.08 max %2.0 max %0.04 max %0.30 max %0.75 max

%17 - 20

%9.0 - 13.0

Min: 10 x (C+N) - max: 1.0%



Links About 347 (1.4550) Grade 

1.4550 (347) STAINLESS STEEL