NBK precision pipe
seamless NBK steel pipe

NBK precision pipe
NBK precision pipe, seamless NBK pipe
precision pipes NBK means anti-oxidation annealing.

We are able to supply high quality cold drawn seamless NBK pipes produced according to the DIN2445 and then annealed – NBK means anti-oxidation annealing – pipe annealing in high temperature to get proper metal structure in antioxidation atmosphere inside the furnice.

You need to remember that beacuse we are using “protective gas atmosphere” to produce NBK pipes that proces is slightly more expensive then when BK pipes or GBK pipes, but you recive high quality product.

Adventages of NBK anti-oxidation annealing:

  • NBK seamless pipes are the best choice for applications opened on rust influence.
  • good hardness
  • dimension tolerance according the DIN standard
  • large range of material avaliable for application type according the Client needs, possible it to use stainless steel too.

Steel types avaliable for NBK precision pipes annealing:

  • carbon steel, special steel (ST35, ST37.4, ST45, ST55, CK45, ST52 according DIN2391) OD = 4 ÷ 60 mm
  • stainless steel (304, 304L, 321, 316, 316L, 347H, 310S, 904L, 800H, S31803) OD = 6 ÷ 532 mm

NBK anti-oxidation process example: we use standard steel type St. 37.4 according DIN 1630 (outside passivation)
Temperature: 120° C
Hardness: about 235 N/mm²
Dimmension tolerance according DIN 2391.

NBK precision pipe, NBK pipe, seamless pipe NBK , seamless NBK pipe, NBK means anti-oxidation annealing