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.
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.
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