DIN 17456 Seamless Circular Stainless Steel Tubes for General Purpose

General Purpose Seamless Circular Stainless Steel Tubes

DIN17456 standard for general purpose welded circular tubes made of stainless ferritic, martensitic or austensitic or austenitic steels as given in table 1. Tubes of this kind may be used in construction, or in the food, pharmaceutical and automobile industries, as well as for domestic installations or decorative purposes.

 Steel grade and their chemical composition in the cast analysis

 Minimum values for 0.2% and 1% proof stresses for steels at elevated temperatures and guidelines for limit temperatures with regard to intercrystalline corrosion

 Product forms and finish

c1 Hot worked, heat treated   descaled                

Metallically clean

c2 Hot worked, heat treated   pickled                      

Metallically clean    

f    Mechanically or chemically descaled, cold worked, not heat treated

Metallically bright drawn, considerably smoother than forms c1and c2

g   Cold worked, heat treated not descaled              

Scaled

h   Cold worked, heat treated pickled                        

Metallically bright pickled, smoother than form c2 

m  Cold worked, heat treated scale-free                  

Metallically bright annealed, smoother than form h

n1  Scale-free, cold tempered (polished by tempering), not heat treated            

Metallically polished drawn, smoother than forms h and m

n2  Cold tempered (polished by tempering), heat treated,scale-free                                         

Metallically bright annealed, smoother than forms h and m

o     Ground                                                                

Ground, metallically bright, with type of grinding to be agreed when ordering

p     Polished                                                              

Polished, metallically bright, with type and quality of polish to be agreed when ordering                          

Dimension and mass per unit length for tubes made of stainless ferritic or martensitic steels

Limit deviations for outside diameters and wall thicknesses

Limit deviations for exact lengths

Packing

Producing Process